archive/tar: vendor again
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> (cherry picked from commit 7b30fd0e1d8bc77f0556181c82f85d046b058f27) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Kir Kolyshkin
Sebastiaan van Stijn
parent
c208f1c8a8
commit
66720189e0
12 changed files with 3025 additions and 0 deletions
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@ -41,6 +41,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
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# IMPORTANT: If the version of Go is updated, the Windows to Linux CI machines
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# will need updating, to avoid errors. Ping #docker-maintainers on IRC
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# with a heads-up.
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# IMPORTANT: When updating this please note that stdlib archive/tar pkg is vendored
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ENV GO_VERSION 1.10.1
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RUN curl -fsSL "https://golang.org/dl/go${GO_VERSION}.linux-amd64.tar.gz" \
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| tar -xzC /usr/local
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@ -150,3 +150,9 @@ github.com/Nvveen/Gotty a8b993ba6abdb0e0c12b0125c603323a71c7790c https://github.
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github.com/docker/go-metrics d466d4f6fd960e01820085bd7e1a24426ee7ef18
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github.com/opencontainers/selinux b29023b86e4a69d1b46b7e7b4e2b6fda03f0b9cd
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# archive/tar (for Go 1.10, see https://github.com/golang/go/issues/24787)
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# mkdir -p ./vendor/archive
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# git clone -b go-1.10 --depth=1 git@github.com:kolyshkin/go-tar.git ./vendor/archive/tar
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# vndr # to clean up test files
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27
vendor/archive/tar/LICENSE
vendored
Normal file
27
vendor/archive/tar/LICENSE
vendored
Normal file
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@ -0,0 +1,27 @@
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Copyright (c) 2009 The Go Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27
vendor/archive/tar/README.md
vendored
Normal file
27
vendor/archive/tar/README.md
vendored
Normal file
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@ -0,0 +1,27 @@
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This is a fork of Go 1.10 `archive/tar` package from the official
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[repo](https://github.com/golang/go/tree/release-branch.go1.10/src/archive/tar),
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with a partial [revert](https://github.com/kolyshkin/go-tar/commit/d651d6e45972363e9bb62b8e9d876df440b31628)
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of upstream [commit 0564e304a6ea](https://github.com/golang/go/commit/0564e304a6ea394a42929060c588469dbd6f32af).
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It is suggested as a replacement to the original package included with Go 1.10
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in case you want to build a static Linux/glibc binary that works, and
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can't afford to use `CGO_ENABLED=0`.
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## Details
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Using Go 1.10 [archive/tar](https://golang.org/pkg/archive/tar/) from a static binary
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compiled with glibc on Linux can result in a panic upon calling
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[`tar.FileInfoHeader()`](https://golang.org/pkg/archive/tar/#FileInfoHeader).
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This is a major regression in Go 1.10, filed as
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[Go issue #24787](https://github.com/golang/go/issues/24787).
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The above issue is caused by an unfortunate combination of:
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1. glibc way of dynamic loading of nss libraries even for a static build;
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2. Go `os/user` package hard-coded reliance on libc to resolve user/group IDs to names (unless CGO is disabled).
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While glibc can probably not be fixed and is not considered a bug per se,
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the `os/user` issue is documented (see [Go issue #23265](https://github.com/golang/go/issues/23265))
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and already fixed by [Go commit 62f0127d81](https://github.com/golang/go/commit/62f0127d8104d8266d9a3fb5a87e2f09ec8b6f5b).
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The fix is expected to make its way to Go 1.11, and requires `osusergo` build tag
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to be used for a static build.
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This repository serves as a temporary workaround until the above fix is available.
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720
vendor/archive/tar/common.go
vendored
Normal file
720
vendor/archive/tar/common.go
vendored
Normal file
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@ -0,0 +1,720 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package tar implements access to tar archives.
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//
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// Tape archives (tar) are a file format for storing a sequence of files that
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// can be read and written in a streaming manner.
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// This package aims to cover most variations of the format,
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// including those produced by GNU and BSD tar tools.
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package tar
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import (
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"errors"
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"fmt"
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"math"
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"os"
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"path"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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// BUG: Use of the Uid and Gid fields in Header could overflow on 32-bit
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// architectures. If a large value is encountered when decoding, the result
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// stored in Header will be the truncated version.
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var (
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ErrHeader = errors.New("archive/tar: invalid tar header")
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ErrWriteTooLong = errors.New("archive/tar: write too long")
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ErrFieldTooLong = errors.New("archive/tar: header field too long")
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ErrWriteAfterClose = errors.New("archive/tar: write after close")
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errMissData = errors.New("archive/tar: sparse file references non-existent data")
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errUnrefData = errors.New("archive/tar: sparse file contains unreferenced data")
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errWriteHole = errors.New("archive/tar: write non-NUL byte in sparse hole")
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)
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type headerError []string
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func (he headerError) Error() string {
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const prefix = "archive/tar: cannot encode header"
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var ss []string
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for _, s := range he {
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if s != "" {
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ss = append(ss, s)
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}
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}
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if len(ss) == 0 {
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return prefix
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}
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return fmt.Sprintf("%s: %v", prefix, strings.Join(ss, "; and "))
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}
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// Type flags for Header.Typeflag.
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const (
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// Type '0' indicates a regular file.
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TypeReg = '0'
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TypeRegA = '\x00' // For legacy support; use TypeReg instead
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// Type '1' to '6' are header-only flags and may not have a data body.
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TypeLink = '1' // Hard link
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TypeSymlink = '2' // Symbolic link
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TypeChar = '3' // Character device node
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TypeBlock = '4' // Block device node
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TypeDir = '5' // Directory
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TypeFifo = '6' // FIFO node
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// Type '7' is reserved.
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TypeCont = '7'
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// Type 'x' is used by the PAX format to store key-value records that
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// are only relevant to the next file.
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// This package transparently handles these types.
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TypeXHeader = 'x'
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// Type 'g' is used by the PAX format to store key-value records that
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// are relevant to all subsequent files.
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// This package only supports parsing and composing such headers,
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// but does not currently support persisting the global state across files.
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TypeXGlobalHeader = 'g'
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// Type 'S' indicates a sparse file in the GNU format.
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TypeGNUSparse = 'S'
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// Types 'L' and 'K' are used by the GNU format for a meta file
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// used to store the path or link name for the next file.
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// This package transparently handles these types.
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TypeGNULongName = 'L'
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TypeGNULongLink = 'K'
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)
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// Keywords for PAX extended header records.
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const (
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paxNone = "" // Indicates that no PAX key is suitable
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paxPath = "path"
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paxLinkpath = "linkpath"
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paxSize = "size"
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paxUid = "uid"
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paxGid = "gid"
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paxUname = "uname"
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paxGname = "gname"
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paxMtime = "mtime"
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paxAtime = "atime"
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paxCtime = "ctime" // Removed from later revision of PAX spec, but was valid
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paxCharset = "charset" // Currently unused
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paxComment = "comment" // Currently unused
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paxSchilyXattr = "SCHILY.xattr."
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// Keywords for GNU sparse files in a PAX extended header.
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paxGNUSparse = "GNU.sparse."
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paxGNUSparseNumBlocks = "GNU.sparse.numblocks"
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paxGNUSparseOffset = "GNU.sparse.offset"
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paxGNUSparseNumBytes = "GNU.sparse.numbytes"
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paxGNUSparseMap = "GNU.sparse.map"
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paxGNUSparseName = "GNU.sparse.name"
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paxGNUSparseMajor = "GNU.sparse.major"
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paxGNUSparseMinor = "GNU.sparse.minor"
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paxGNUSparseSize = "GNU.sparse.size"
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paxGNUSparseRealSize = "GNU.sparse.realsize"
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)
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// basicKeys is a set of the PAX keys for which we have built-in support.
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// This does not contain "charset" or "comment", which are both PAX-specific,
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// so adding them as first-class features of Header is unlikely.
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// Users can use the PAXRecords field to set it themselves.
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var basicKeys = map[string]bool{
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paxPath: true, paxLinkpath: true, paxSize: true, paxUid: true, paxGid: true,
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paxUname: true, paxGname: true, paxMtime: true, paxAtime: true, paxCtime: true,
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}
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// A Header represents a single header in a tar archive.
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// Some fields may not be populated.
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//
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// For forward compatibility, users that retrieve a Header from Reader.Next,
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// mutate it in some ways, and then pass it back to Writer.WriteHeader
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// should do so by creating a new Header and copying the fields
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// that they are interested in preserving.
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type Header struct {
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Typeflag byte // Type of header entry (should be TypeReg for most files)
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Name string // Name of file entry
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Linkname string // Target name of link (valid for TypeLink or TypeSymlink)
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Size int64 // Logical file size in bytes
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Mode int64 // Permission and mode bits
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Uid int // User ID of owner
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Gid int // Group ID of owner
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Uname string // User name of owner
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Gname string // Group name of owner
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// If the Format is unspecified, then Writer.WriteHeader rounds ModTime
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// to the nearest second and ignores the AccessTime and ChangeTime fields.
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//
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// To use AccessTime or ChangeTime, specify the Format as PAX or GNU.
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// To use sub-second resolution, specify the Format as PAX.
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ModTime time.Time // Modification time
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AccessTime time.Time // Access time (requires either PAX or GNU support)
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ChangeTime time.Time // Change time (requires either PAX or GNU support)
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Devmajor int64 // Major device number (valid for TypeChar or TypeBlock)
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Devminor int64 // Minor device number (valid for TypeChar or TypeBlock)
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// Xattrs stores extended attributes as PAX records under the
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// "SCHILY.xattr." namespace.
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//
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// The following are semantically equivalent:
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// h.Xattrs[key] = value
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// h.PAXRecords["SCHILY.xattr."+key] = value
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//
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// When Writer.WriteHeader is called, the contents of Xattrs will take
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// precedence over those in PAXRecords.
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//
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// Deprecated: Use PAXRecords instead.
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Xattrs map[string]string
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// PAXRecords is a map of PAX extended header records.
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//
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// User-defined records should have keys of the following form:
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// VENDOR.keyword
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// Where VENDOR is some namespace in all uppercase, and keyword may
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// not contain the '=' character (e.g., "GOLANG.pkg.version").
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// The key and value should be non-empty UTF-8 strings.
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//
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// When Writer.WriteHeader is called, PAX records derived from the
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// the other fields in Header take precedence over PAXRecords.
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PAXRecords map[string]string
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// Format specifies the format of the tar header.
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//
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// This is set by Reader.Next as a best-effort guess at the format.
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// Since the Reader liberally reads some non-compliant files,
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// it is possible for this to be FormatUnknown.
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//
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// If the format is unspecified when Writer.WriteHeader is called,
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// then it uses the first format (in the order of USTAR, PAX, GNU)
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// capable of encoding this Header (see Format).
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Format Format
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}
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// sparseEntry represents a Length-sized fragment at Offset in the file.
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type sparseEntry struct{ Offset, Length int64 }
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func (s sparseEntry) endOffset() int64 { return s.Offset + s.Length }
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// A sparse file can be represented as either a sparseDatas or a sparseHoles.
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// As long as the total size is known, they are equivalent and one can be
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// converted to the other form and back. The various tar formats with sparse
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// file support represent sparse files in the sparseDatas form. That is, they
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// specify the fragments in the file that has data, and treat everything else as
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// having zero bytes. As such, the encoding and decoding logic in this package
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// deals with sparseDatas.
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//
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// However, the external API uses sparseHoles instead of sparseDatas because the
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// zero value of sparseHoles logically represents a normal file (i.e., there are
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// no holes in it). On the other hand, the zero value of sparseDatas implies
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// that the file has no data in it, which is rather odd.
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//
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// As an example, if the underlying raw file contains the 10-byte data:
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// var compactFile = "abcdefgh"
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//
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// And the sparse map has the following entries:
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// var spd sparseDatas = []sparseEntry{
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// {Offset: 2, Length: 5}, // Data fragment for 2..6
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// {Offset: 18, Length: 3}, // Data fragment for 18..20
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// }
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// var sph sparseHoles = []sparseEntry{
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// {Offset: 0, Length: 2}, // Hole fragment for 0..1
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// {Offset: 7, Length: 11}, // Hole fragment for 7..17
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// {Offset: 21, Length: 4}, // Hole fragment for 21..24
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// }
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//
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// Then the content of the resulting sparse file with a Header.Size of 25 is:
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// var sparseFile = "\x00"*2 + "abcde" + "\x00"*11 + "fgh" + "\x00"*4
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type (
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sparseDatas []sparseEntry
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sparseHoles []sparseEntry
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)
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// validateSparseEntries reports whether sp is a valid sparse map.
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// It does not matter whether sp represents data fragments or hole fragments.
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func validateSparseEntries(sp []sparseEntry, size int64) bool {
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// Validate all sparse entries. These are the same checks as performed by
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// the BSD tar utility.
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if size < 0 {
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return false
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}
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var pre sparseEntry
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for _, cur := range sp {
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switch {
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case cur.Offset < 0 || cur.Length < 0:
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return false // Negative values are never okay
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case cur.Offset > math.MaxInt64-cur.Length:
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return false // Integer overflow with large length
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case cur.endOffset() > size:
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return false // Region extends beyond the actual size
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case pre.endOffset() > cur.Offset:
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return false // Regions cannot overlap and must be in order
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}
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pre = cur
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}
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return true
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}
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// alignSparseEntries mutates src and returns dst where each fragment's
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// starting offset is aligned up to the nearest block edge, and each
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// ending offset is aligned down to the nearest block edge.
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//
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// Even though the Go tar Reader and the BSD tar utility can handle entries
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// with arbitrary offsets and lengths, the GNU tar utility can only handle
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// offsets and lengths that are multiples of blockSize.
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func alignSparseEntries(src []sparseEntry, size int64) []sparseEntry {
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dst := src[:0]
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for _, s := range src {
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pos, end := s.Offset, s.endOffset()
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pos += blockPadding(+pos) // Round-up to nearest blockSize
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if end != size {
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end -= blockPadding(-end) // Round-down to nearest blockSize
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}
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if pos < end {
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dst = append(dst, sparseEntry{Offset: pos, Length: end - pos})
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}
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}
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return dst
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}
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// invertSparseEntries converts a sparse map from one form to the other.
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// If the input is sparseHoles, then it will output sparseDatas and vice-versa.
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// The input must have been already validated.
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//
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// This function mutates src and returns a normalized map where:
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// * adjacent fragments are coalesced together
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// * only the last fragment may be empty
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// * the endOffset of the last fragment is the total size
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func invertSparseEntries(src []sparseEntry, size int64) []sparseEntry {
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dst := src[:0]
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var pre sparseEntry
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for _, cur := range src {
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if cur.Length == 0 {
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continue // Skip empty fragments
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}
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pre.Length = cur.Offset - pre.Offset
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if pre.Length > 0 {
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dst = append(dst, pre) // Only add non-empty fragments
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}
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pre.Offset = cur.endOffset()
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}
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pre.Length = size - pre.Offset // Possibly the only empty fragment
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return append(dst, pre)
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}
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// fileState tracks the number of logical (includes sparse holes) and physical
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// (actual in tar archive) bytes remaining for the current file.
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//
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// Invariant: LogicalRemaining >= PhysicalRemaining
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type fileState interface {
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LogicalRemaining() int64
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PhysicalRemaining() int64
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}
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// allowedFormats determines which formats can be used.
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// The value returned is the logical OR of multiple possible formats.
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// If the value is FormatUnknown, then the input Header cannot be encoded
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// and an error is returned explaining why.
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//
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// As a by-product of checking the fields, this function returns paxHdrs, which
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// contain all fields that could not be directly encoded.
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// A value receiver ensures that this method does not mutate the source Header.
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func (h Header) allowedFormats() (format Format, paxHdrs map[string]string, err error) {
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format = FormatUSTAR | FormatPAX | FormatGNU
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paxHdrs = make(map[string]string)
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|
||||
var whyNoUSTAR, whyNoPAX, whyNoGNU string
|
||||
var preferPAX bool // Prefer PAX over USTAR
|
||||
verifyString := func(s string, size int, name, paxKey string) {
|
||||
// NUL-terminator is optional for path and linkpath.
|
||||
// Technically, it is required for uname and gname,
|
||||
// but neither GNU nor BSD tar checks for it.
|
||||
tooLong := len(s) > size
|
||||
allowLongGNU := paxKey == paxPath || paxKey == paxLinkpath
|
||||
if hasNUL(s) || (tooLong && !allowLongGNU) {
|
||||
whyNoGNU = fmt.Sprintf("GNU cannot encode %s=%q", name, s)
|
||||
format.mustNotBe(FormatGNU)
|
||||
}
|
||||
if !isASCII(s) || tooLong {
|
||||
canSplitUSTAR := paxKey == paxPath
|
||||
if _, _, ok := splitUSTARPath(s); !canSplitUSTAR || !ok {
|
||||
whyNoUSTAR = fmt.Sprintf("USTAR cannot encode %s=%q", name, s)
|
||||
format.mustNotBe(FormatUSTAR)
|
||||
}
|
||||
if paxKey == paxNone {
|
||||
whyNoPAX = fmt.Sprintf("PAX cannot encode %s=%q", name, s)
|
||||
format.mustNotBe(FormatPAX)
|
||||
} else {
|
||||
paxHdrs[paxKey] = s
|
||||
}
|
||||
}
|
||||
if v, ok := h.PAXRecords[paxKey]; ok && v == s {
|
||||
paxHdrs[paxKey] = v
|
||||
}
|
||||
}
|
||||
verifyNumeric := func(n int64, size int, name, paxKey string) {
|
||||
if !fitsInBase256(size, n) {
|
||||
whyNoGNU = fmt.Sprintf("GNU cannot encode %s=%d", name, n)
|
||||
format.mustNotBe(FormatGNU)
|
||||
}
|
||||
if !fitsInOctal(size, n) {
|
||||
whyNoUSTAR = fmt.Sprintf("USTAR cannot encode %s=%d", name, n)
|
||||
format.mustNotBe(FormatUSTAR)
|
||||
if paxKey == paxNone {
|
||||
whyNoPAX = fmt.Sprintf("PAX cannot encode %s=%d", name, n)
|
||||
format.mustNotBe(FormatPAX)
|
||||
} else {
|
||||
paxHdrs[paxKey] = strconv.FormatInt(n, 10)
|
||||
}
|
||||
}
|
||||
if v, ok := h.PAXRecords[paxKey]; ok && v == strconv.FormatInt(n, 10) {
|
||||
paxHdrs[paxKey] = v
|
||||
}
|
||||
}
|
||||
verifyTime := func(ts time.Time, size int, name, paxKey string) {
|
||||
if ts.IsZero() {
|
||||
return // Always okay
|
||||
}
|
||||
if !fitsInBase256(size, ts.Unix()) {
|
||||
whyNoGNU = fmt.Sprintf("GNU cannot encode %s=%v", name, ts)
|
||||
format.mustNotBe(FormatGNU)
|
||||
}
|
||||
isMtime := paxKey == paxMtime
|
||||
fitsOctal := fitsInOctal(size, ts.Unix())
|
||||
if (isMtime && !fitsOctal) || !isMtime {
|
||||
whyNoUSTAR = fmt.Sprintf("USTAR cannot encode %s=%v", name, ts)
|
||||
format.mustNotBe(FormatUSTAR)
|
||||
}
|
||||
needsNano := ts.Nanosecond() != 0
|
||||
if !isMtime || !fitsOctal || needsNano {
|
||||
preferPAX = true // USTAR may truncate sub-second measurements
|
||||
if paxKey == paxNone {
|
||||
whyNoPAX = fmt.Sprintf("PAX cannot encode %s=%v", name, ts)
|
||||
format.mustNotBe(FormatPAX)
|
||||
} else {
|
||||
paxHdrs[paxKey] = formatPAXTime(ts)
|
||||
}
|
||||
}
|
||||
if v, ok := h.PAXRecords[paxKey]; ok && v == formatPAXTime(ts) {
|
||||
paxHdrs[paxKey] = v
|
||||
}
|
||||
}
|
||||
|
||||
// Check basic fields.
|
||||
var blk block
|
||||
v7 := blk.V7()
|
||||
ustar := blk.USTAR()
|
||||
gnu := blk.GNU()
|
||||
verifyString(h.Name, len(v7.Name()), "Name", paxPath)
|
||||
verifyString(h.Linkname, len(v7.LinkName()), "Linkname", paxLinkpath)
|
||||
verifyString(h.Uname, len(ustar.UserName()), "Uname", paxUname)
|
||||
verifyString(h.Gname, len(ustar.GroupName()), "Gname", paxGname)
|
||||
verifyNumeric(h.Mode, len(v7.Mode()), "Mode", paxNone)
|
||||
verifyNumeric(int64(h.Uid), len(v7.UID()), "Uid", paxUid)
|
||||
verifyNumeric(int64(h.Gid), len(v7.GID()), "Gid", paxGid)
|
||||
verifyNumeric(h.Size, len(v7.Size()), "Size", paxSize)
|
||||
verifyNumeric(h.Devmajor, len(ustar.DevMajor()), "Devmajor", paxNone)
|
||||
verifyNumeric(h.Devminor, len(ustar.DevMinor()), "Devminor", paxNone)
|
||||
verifyTime(h.ModTime, len(v7.ModTime()), "ModTime", paxMtime)
|
||||
verifyTime(h.AccessTime, len(gnu.AccessTime()), "AccessTime", paxAtime)
|
||||
verifyTime(h.ChangeTime, len(gnu.ChangeTime()), "ChangeTime", paxCtime)
|
||||
|
||||
// Check for header-only types.
|
||||
var whyOnlyPAX, whyOnlyGNU string
|
||||
switch h.Typeflag {
|
||||
case TypeReg, TypeChar, TypeBlock, TypeFifo, TypeGNUSparse:
|
||||
// Exclude TypeLink and TypeSymlink, since they may reference directories.
|
||||
if strings.HasSuffix(h.Name, "/") {
|
||||
return FormatUnknown, nil, headerError{"filename may not have trailing slash"}
|
||||
}
|
||||
case TypeXHeader, TypeGNULongName, TypeGNULongLink:
|
||||
return FormatUnknown, nil, headerError{"cannot manually encode TypeXHeader, TypeGNULongName, or TypeGNULongLink headers"}
|
||||
case TypeXGlobalHeader:
|
||||
h2 := Header{Name: h.Name, Typeflag: h.Typeflag, Xattrs: h.Xattrs, PAXRecords: h.PAXRecords, Format: h.Format}
|
||||
if !reflect.DeepEqual(h, h2) {
|
||||
return FormatUnknown, nil, headerError{"only PAXRecords should be set for TypeXGlobalHeader"}
|
||||
}
|
||||
whyOnlyPAX = "only PAX supports TypeXGlobalHeader"
|
||||
format.mayOnlyBe(FormatPAX)
|
||||
}
|
||||
if !isHeaderOnlyType(h.Typeflag) && h.Size < 0 {
|
||||
return FormatUnknown, nil, headerError{"negative size on header-only type"}
|
||||
}
|
||||
|
||||
// Check PAX records.
|
||||
if len(h.Xattrs) > 0 {
|
||||
for k, v := range h.Xattrs {
|
||||
paxHdrs[paxSchilyXattr+k] = v
|
||||
}
|
||||
whyOnlyPAX = "only PAX supports Xattrs"
|
||||
format.mayOnlyBe(FormatPAX)
|
||||
}
|
||||
if len(h.PAXRecords) > 0 {
|
||||
for k, v := range h.PAXRecords {
|
||||
switch _, exists := paxHdrs[k]; {
|
||||
case exists:
|
||||
continue // Do not overwrite existing records
|
||||
case h.Typeflag == TypeXGlobalHeader:
|
||||
paxHdrs[k] = v // Copy all records
|
||||
case !basicKeys[k] && !strings.HasPrefix(k, paxGNUSparse):
|
||||
paxHdrs[k] = v // Ignore local records that may conflict
|
||||
}
|
||||
}
|
||||
whyOnlyPAX = "only PAX supports PAXRecords"
|
||||
format.mayOnlyBe(FormatPAX)
|
||||
}
|
||||
for k, v := range paxHdrs {
|
||||
if !validPAXRecord(k, v) {
|
||||
return FormatUnknown, nil, headerError{fmt.Sprintf("invalid PAX record: %q", k+" = "+v)}
|
||||
}
|
||||
}
|
||||
|
||||
// TODO(dsnet): Re-enable this when adding sparse support.
|
||||
// See https://golang.org/issue/22735
|
||||
/*
|
||||
// Check sparse files.
|
||||
if len(h.SparseHoles) > 0 || h.Typeflag == TypeGNUSparse {
|
||||
if isHeaderOnlyType(h.Typeflag) {
|
||||
return FormatUnknown, nil, headerError{"header-only type cannot be sparse"}
|
||||
}
|
||||
if !validateSparseEntries(h.SparseHoles, h.Size) {
|
||||
return FormatUnknown, nil, headerError{"invalid sparse holes"}
|
||||
}
|
||||
if h.Typeflag == TypeGNUSparse {
|
||||
whyOnlyGNU = "only GNU supports TypeGNUSparse"
|
||||
format.mayOnlyBe(FormatGNU)
|
||||
} else {
|
||||
whyNoGNU = "GNU supports sparse files only with TypeGNUSparse"
|
||||
format.mustNotBe(FormatGNU)
|
||||
}
|
||||
whyNoUSTAR = "USTAR does not support sparse files"
|
||||
format.mustNotBe(FormatUSTAR)
|
||||
}
|
||||
*/
|
||||
|
||||
// Check desired format.
|
||||
if wantFormat := h.Format; wantFormat != FormatUnknown {
|
||||
if wantFormat.has(FormatPAX) && !preferPAX {
|
||||
wantFormat.mayBe(FormatUSTAR) // PAX implies USTAR allowed too
|
||||
}
|
||||
format.mayOnlyBe(wantFormat) // Set union of formats allowed and format wanted
|
||||
}
|
||||
if format == FormatUnknown {
|
||||
switch h.Format {
|
||||
case FormatUSTAR:
|
||||
err = headerError{"Format specifies USTAR", whyNoUSTAR, whyOnlyPAX, whyOnlyGNU}
|
||||
case FormatPAX:
|
||||
err = headerError{"Format specifies PAX", whyNoPAX, whyOnlyGNU}
|
||||
case FormatGNU:
|
||||
err = headerError{"Format specifies GNU", whyNoGNU, whyOnlyPAX}
|
||||
default:
|
||||
err = headerError{whyNoUSTAR, whyNoPAX, whyNoGNU, whyOnlyPAX, whyOnlyGNU}
|
||||
}
|
||||
}
|
||||
return format, paxHdrs, err
|
||||
}
|
||||
|
||||
// FileInfo returns an os.FileInfo for the Header.
|
||||
func (h *Header) FileInfo() os.FileInfo {
|
||||
return headerFileInfo{h}
|
||||
}
|
||||
|
||||
// headerFileInfo implements os.FileInfo.
|
||||
type headerFileInfo struct {
|
||||
h *Header
|
||||
}
|
||||
|
||||
func (fi headerFileInfo) Size() int64 { return fi.h.Size }
|
||||
func (fi headerFileInfo) IsDir() bool { return fi.Mode().IsDir() }
|
||||
func (fi headerFileInfo) ModTime() time.Time { return fi.h.ModTime }
|
||||
func (fi headerFileInfo) Sys() interface{} { return fi.h }
|
||||
|
||||
// Name returns the base name of the file.
|
||||
func (fi headerFileInfo) Name() string {
|
||||
if fi.IsDir() {
|
||||
return path.Base(path.Clean(fi.h.Name))
|
||||
}
|
||||
return path.Base(fi.h.Name)
|
||||
}
|
||||
|
||||
// Mode returns the permission and mode bits for the headerFileInfo.
|
||||
func (fi headerFileInfo) Mode() (mode os.FileMode) {
|
||||
// Set file permission bits.
|
||||
mode = os.FileMode(fi.h.Mode).Perm()
|
||||
|
||||
// Set setuid, setgid and sticky bits.
|
||||
if fi.h.Mode&c_ISUID != 0 {
|
||||
mode |= os.ModeSetuid
|
||||
}
|
||||
if fi.h.Mode&c_ISGID != 0 {
|
||||
mode |= os.ModeSetgid
|
||||
}
|
||||
if fi.h.Mode&c_ISVTX != 0 {
|
||||
mode |= os.ModeSticky
|
||||
}
|
||||
|
||||
// Set file mode bits; clear perm, setuid, setgid, and sticky bits.
|
||||
switch m := os.FileMode(fi.h.Mode) &^ 07777; m {
|
||||
case c_ISDIR:
|
||||
mode |= os.ModeDir
|
||||
case c_ISFIFO:
|
||||
mode |= os.ModeNamedPipe
|
||||
case c_ISLNK:
|
||||
mode |= os.ModeSymlink
|
||||
case c_ISBLK:
|
||||
mode |= os.ModeDevice
|
||||
case c_ISCHR:
|
||||
mode |= os.ModeDevice
|
||||
mode |= os.ModeCharDevice
|
||||
case c_ISSOCK:
|
||||
mode |= os.ModeSocket
|
||||
}
|
||||
|
||||
switch fi.h.Typeflag {
|
||||
case TypeSymlink:
|
||||
mode |= os.ModeSymlink
|
||||
case TypeChar:
|
||||
mode |= os.ModeDevice
|
||||
mode |= os.ModeCharDevice
|
||||
case TypeBlock:
|
||||
mode |= os.ModeDevice
|
||||
case TypeDir:
|
||||
mode |= os.ModeDir
|
||||
case TypeFifo:
|
||||
mode |= os.ModeNamedPipe
|
||||
}
|
||||
|
||||
return mode
|
||||
}
|
||||
|
||||
// sysStat, if non-nil, populates h from system-dependent fields of fi.
|
||||
var sysStat func(fi os.FileInfo, h *Header) error
|
||||
|
||||
const (
|
||||
// Mode constants from the USTAR spec:
|
||||
// See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
|
||||
c_ISUID = 04000 // Set uid
|
||||
c_ISGID = 02000 // Set gid
|
||||
c_ISVTX = 01000 // Save text (sticky bit)
|
||||
|
||||
// Common Unix mode constants; these are not defined in any common tar standard.
|
||||
// Header.FileInfo understands these, but FileInfoHeader will never produce these.
|
||||
c_ISDIR = 040000 // Directory
|
||||
c_ISFIFO = 010000 // FIFO
|
||||
c_ISREG = 0100000 // Regular file
|
||||
c_ISLNK = 0120000 // Symbolic link
|
||||
c_ISBLK = 060000 // Block special file
|
||||
c_ISCHR = 020000 // Character special file
|
||||
c_ISSOCK = 0140000 // Socket
|
||||
)
|
||||
|
||||
// FileInfoHeader creates a partially-populated Header from fi.
|
||||
// If fi describes a symlink, FileInfoHeader records link as the link target.
|
||||
// If fi describes a directory, a slash is appended to the name.
|
||||
//
|
||||
// Since os.FileInfo's Name method only returns the base name of
|
||||
// the file it describes, it may be necessary to modify Header.Name
|
||||
// to provide the full path name of the file.
|
||||
func FileInfoHeader(fi os.FileInfo, link string) (*Header, error) {
|
||||
if fi == nil {
|
||||
return nil, errors.New("archive/tar: FileInfo is nil")
|
||||
}
|
||||
fm := fi.Mode()
|
||||
h := &Header{
|
||||
Name: fi.Name(),
|
||||
ModTime: fi.ModTime(),
|
||||
Mode: int64(fm.Perm()), // or'd with c_IS* constants later
|
||||
}
|
||||
switch {
|
||||
case fm.IsRegular():
|
||||
h.Typeflag = TypeReg
|
||||
h.Size = fi.Size()
|
||||
case fi.IsDir():
|
||||
h.Typeflag = TypeDir
|
||||
h.Name += "/"
|
||||
case fm&os.ModeSymlink != 0:
|
||||
h.Typeflag = TypeSymlink
|
||||
h.Linkname = link
|
||||
case fm&os.ModeDevice != 0:
|
||||
if fm&os.ModeCharDevice != 0 {
|
||||
h.Typeflag = TypeChar
|
||||
} else {
|
||||
h.Typeflag = TypeBlock
|
||||
}
|
||||
case fm&os.ModeNamedPipe != 0:
|
||||
h.Typeflag = TypeFifo
|
||||
case fm&os.ModeSocket != 0:
|
||||
return nil, fmt.Errorf("archive/tar: sockets not supported")
|
||||
default:
|
||||
return nil, fmt.Errorf("archive/tar: unknown file mode %v", fm)
|
||||
}
|
||||
if fm&os.ModeSetuid != 0 {
|
||||
h.Mode |= c_ISUID
|
||||
}
|
||||
if fm&os.ModeSetgid != 0 {
|
||||
h.Mode |= c_ISGID
|
||||
}
|
||||
if fm&os.ModeSticky != 0 {
|
||||
h.Mode |= c_ISVTX
|
||||
}
|
||||
// If possible, populate additional fields from OS-specific
|
||||
// FileInfo fields.
|
||||
if sys, ok := fi.Sys().(*Header); ok {
|
||||
// This FileInfo came from a Header (not the OS). Use the
|
||||
// original Header to populate all remaining fields.
|
||||
h.Uid = sys.Uid
|
||||
h.Gid = sys.Gid
|
||||
h.Uname = sys.Uname
|
||||
h.Gname = sys.Gname
|
||||
h.AccessTime = sys.AccessTime
|
||||
h.ChangeTime = sys.ChangeTime
|
||||
if sys.Xattrs != nil {
|
||||
h.Xattrs = make(map[string]string)
|
||||
for k, v := range sys.Xattrs {
|
||||
h.Xattrs[k] = v
|
||||
}
|
||||
}
|
||||
if sys.Typeflag == TypeLink {
|
||||
// hard link
|
||||
h.Typeflag = TypeLink
|
||||
h.Size = 0
|
||||
h.Linkname = sys.Linkname
|
||||
}
|
||||
if sys.PAXRecords != nil {
|
||||
h.PAXRecords = make(map[string]string)
|
||||
for k, v := range sys.PAXRecords {
|
||||
h.PAXRecords[k] = v
|
||||
}
|
||||
}
|
||||
}
|
||||
if sysStat != nil {
|
||||
return h, sysStat(fi, h)
|
||||
}
|
||||
return h, nil
|
||||
}
|
||||
|
||||
// isHeaderOnlyType checks if the given type flag is of the type that has no
|
||||
// data section even if a size is specified.
|
||||
func isHeaderOnlyType(flag byte) bool {
|
||||
switch flag {
|
||||
case TypeLink, TypeSymlink, TypeChar, TypeBlock, TypeDir, TypeFifo:
|
||||
return true
|
||||
default:
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
func min(a, b int64) int64 {
|
||||
if a < b {
|
||||
return a
|
||||
}
|
||||
return b
|
||||
}
|
||||
303
vendor/archive/tar/format.go
vendored
Normal file
303
vendor/archive/tar/format.go
vendored
Normal file
|
|
@ -0,0 +1,303 @@
|
|||
// Copyright 2016 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package tar
|
||||
|
||||
import "strings"
|
||||
|
||||
// Format represents the tar archive format.
|
||||
//
|
||||
// The original tar format was introduced in Unix V7.
|
||||
// Since then, there have been multiple competing formats attempting to
|
||||
// standardize or extend the V7 format to overcome its limitations.
|
||||
// The most common formats are the USTAR, PAX, and GNU formats,
|
||||
// each with their own advantages and limitations.
|
||||
//
|
||||
// The following table captures the capabilities of each format:
|
||||
//
|
||||
// | USTAR | PAX | GNU
|
||||
// ------------------+--------+-----------+----------
|
||||
// Name | 256B | unlimited | unlimited
|
||||
// Linkname | 100B | unlimited | unlimited
|
||||
// Size | uint33 | unlimited | uint89
|
||||
// Mode | uint21 | uint21 | uint57
|
||||
// Uid/Gid | uint21 | unlimited | uint57
|
||||
// Uname/Gname | 32B | unlimited | 32B
|
||||
// ModTime | uint33 | unlimited | int89
|
||||
// AccessTime | n/a | unlimited | int89
|
||||
// ChangeTime | n/a | unlimited | int89
|
||||
// Devmajor/Devminor | uint21 | uint21 | uint57
|
||||
// ------------------+--------+-----------+----------
|
||||
// string encoding | ASCII | UTF-8 | binary
|
||||
// sub-second times | no | yes | no
|
||||
// sparse files | no | yes | yes
|
||||
//
|
||||
// The table's upper portion shows the Header fields, where each format reports
|
||||
// the maximum number of bytes allowed for each string field and
|
||||
// the integer type used to store each numeric field
|
||||
// (where timestamps are stored as the number of seconds since the Unix epoch).
|
||||
//
|
||||
// The table's lower portion shows specialized features of each format,
|
||||
// such as supported string encodings, support for sub-second timestamps,
|
||||
// or support for sparse files.
|
||||
//
|
||||
// The Writer currently provides no support for sparse files.
|
||||
type Format int
|
||||
|
||||
// Constants to identify various tar formats.
|
||||
const (
|
||||
// Deliberately hide the meaning of constants from public API.
|
||||
_ Format = (1 << iota) / 4 // Sequence of 0, 0, 1, 2, 4, 8, etc...
|
||||
|
||||
// FormatUnknown indicates that the format is unknown.
|
||||
FormatUnknown
|
||||
|
||||
// The format of the original Unix V7 tar tool prior to standardization.
|
||||
formatV7
|
||||
|
||||
// FormatUSTAR represents the USTAR header format defined in POSIX.1-1988.
|
||||
//
|
||||
// While this format is compatible with most tar readers,
|
||||
// the format has several limitations making it unsuitable for some usages.
|
||||
// Most notably, it cannot support sparse files, files larger than 8GiB,
|
||||
// filenames larger than 256 characters, and non-ASCII filenames.
|
||||
//
|
||||
// Reference:
|
||||
// http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13_06
|
||||
FormatUSTAR
|
||||
|
||||
// FormatPAX represents the PAX header format defined in POSIX.1-2001.
|
||||
//
|
||||
// PAX extends USTAR by writing a special file with Typeflag TypeXHeader
|
||||
// preceding the original header. This file contains a set of key-value
|
||||
// records, which are used to overcome USTAR's shortcomings, in addition to
|
||||
// providing the ability to have sub-second resolution for timestamps.
|
||||
//
|
||||
// Some newer formats add their own extensions to PAX by defining their
|
||||
// own keys and assigning certain semantic meaning to the associated values.
|
||||
// For example, sparse file support in PAX is implemented using keys
|
||||
// defined by the GNU manual (e.g., "GNU.sparse.map").
|
||||
//
|
||||
// Reference:
|
||||
// http://pubs.opengroup.org/onlinepubs/009695399/utilities/pax.html
|
||||
FormatPAX
|
||||
|
||||
// FormatGNU represents the GNU header format.
|
||||
//
|
||||
// The GNU header format is older than the USTAR and PAX standards and
|
||||
// is not compatible with them. The GNU format supports
|
||||
// arbitrary file sizes, filenames of arbitrary encoding and length,
|
||||
// sparse files, and other features.
|
||||
//
|
||||
// It is recommended that PAX be chosen over GNU unless the target
|
||||
// application can only parse GNU formatted archives.
|
||||
//
|
||||
// Reference:
|
||||
// http://www.gnu.org/software/tar/manual/html_node/Standard.html
|
||||
FormatGNU
|
||||
|
||||
// Schily's tar format, which is incompatible with USTAR.
|
||||
// This does not cover STAR extensions to the PAX format; these fall under
|
||||
// the PAX format.
|
||||
formatSTAR
|
||||
|
||||
formatMax
|
||||
)
|
||||
|
||||
func (f Format) has(f2 Format) bool { return f&f2 != 0 }
|
||||
func (f *Format) mayBe(f2 Format) { *f |= f2 }
|
||||
func (f *Format) mayOnlyBe(f2 Format) { *f &= f2 }
|
||||
func (f *Format) mustNotBe(f2 Format) { *f &^= f2 }
|
||||
|
||||
var formatNames = map[Format]string{
|
||||
formatV7: "V7", FormatUSTAR: "USTAR", FormatPAX: "PAX", FormatGNU: "GNU", formatSTAR: "STAR",
|
||||
}
|
||||
|
||||
func (f Format) String() string {
|
||||
var ss []string
|
||||
for f2 := Format(1); f2 < formatMax; f2 <<= 1 {
|
||||
if f.has(f2) {
|
||||
ss = append(ss, formatNames[f2])
|
||||
}
|
||||
}
|
||||
switch len(ss) {
|
||||
case 0:
|
||||
return "<unknown>"
|
||||
case 1:
|
||||
return ss[0]
|
||||
default:
|
||||
return "(" + strings.Join(ss, " | ") + ")"
|
||||
}
|
||||
}
|
||||
|
||||
// Magics used to identify various formats.
|
||||
const (
|
||||
magicGNU, versionGNU = "ustar ", " \x00"
|
||||
magicUSTAR, versionUSTAR = "ustar\x00", "00"
|
||||
trailerSTAR = "tar\x00"
|
||||
)
|
||||
|
||||
// Size constants from various tar specifications.
|
||||
const (
|
||||
blockSize = 512 // Size of each block in a tar stream
|
||||
nameSize = 100 // Max length of the name field in USTAR format
|
||||
prefixSize = 155 // Max length of the prefix field in USTAR format
|
||||
)
|
||||
|
||||
// blockPadding computes the number of bytes needed to pad offset up to the
|
||||
// nearest block edge where 0 <= n < blockSize.
|
||||
func blockPadding(offset int64) (n int64) {
|
||||
return -offset & (blockSize - 1)
|
||||
}
|
||||
|
||||
var zeroBlock block
|
||||
|
||||
type block [blockSize]byte
|
||||
|
||||
// Convert block to any number of formats.
|
||||
func (b *block) V7() *headerV7 { return (*headerV7)(b) }
|
||||
func (b *block) GNU() *headerGNU { return (*headerGNU)(b) }
|
||||
func (b *block) STAR() *headerSTAR { return (*headerSTAR)(b) }
|
||||
func (b *block) USTAR() *headerUSTAR { return (*headerUSTAR)(b) }
|
||||
func (b *block) Sparse() sparseArray { return (sparseArray)(b[:]) }
|
||||
|
||||
// GetFormat checks that the block is a valid tar header based on the checksum.
|
||||
// It then attempts to guess the specific format based on magic values.
|
||||
// If the checksum fails, then FormatUnknown is returned.
|
||||
func (b *block) GetFormat() Format {
|
||||
// Verify checksum.
|
||||
var p parser
|
||||
value := p.parseOctal(b.V7().Chksum())
|
||||
chksum1, chksum2 := b.ComputeChecksum()
|
||||
if p.err != nil || (value != chksum1 && value != chksum2) {
|
||||
return FormatUnknown
|
||||
}
|
||||
|
||||
// Guess the magic values.
|
||||
magic := string(b.USTAR().Magic())
|
||||
version := string(b.USTAR().Version())
|
||||
trailer := string(b.STAR().Trailer())
|
||||
switch {
|
||||
case magic == magicUSTAR && trailer == trailerSTAR:
|
||||
return formatSTAR
|
||||
case magic == magicUSTAR:
|
||||
return FormatUSTAR | FormatPAX
|
||||
case magic == magicGNU && version == versionGNU:
|
||||
return FormatGNU
|
||||
default:
|
||||
return formatV7
|
||||
}
|
||||
}
|
||||
|
||||
// SetFormat writes the magic values necessary for specified format
|
||||
// and then updates the checksum accordingly.
|
||||
func (b *block) SetFormat(format Format) {
|
||||
// Set the magic values.
|
||||
switch {
|
||||
case format.has(formatV7):
|
||||
// Do nothing.
|
||||
case format.has(FormatGNU):
|
||||
copy(b.GNU().Magic(), magicGNU)
|
||||
copy(b.GNU().Version(), versionGNU)
|
||||
case format.has(formatSTAR):
|
||||
copy(b.STAR().Magic(), magicUSTAR)
|
||||
copy(b.STAR().Version(), versionUSTAR)
|
||||
copy(b.STAR().Trailer(), trailerSTAR)
|
||||
case format.has(FormatUSTAR | FormatPAX):
|
||||
copy(b.USTAR().Magic(), magicUSTAR)
|
||||
copy(b.USTAR().Version(), versionUSTAR)
|
||||
default:
|
||||
panic("invalid format")
|
||||
}
|
||||
|
||||
// Update checksum.
|
||||
// This field is special in that it is terminated by a NULL then space.
|
||||
var f formatter
|
||||
field := b.V7().Chksum()
|
||||
chksum, _ := b.ComputeChecksum() // Possible values are 256..128776
|
||||
f.formatOctal(field[:7], chksum) // Never fails since 128776 < 262143
|
||||
field[7] = ' '
|
||||
}
|
||||
|
||||
// ComputeChecksum computes the checksum for the header block.
|
||||
// POSIX specifies a sum of the unsigned byte values, but the Sun tar used
|
||||
// signed byte values.
|
||||
// We compute and return both.
|
||||
func (b *block) ComputeChecksum() (unsigned, signed int64) {
|
||||
for i, c := range b {
|
||||
if 148 <= i && i < 156 {
|
||||
c = ' ' // Treat the checksum field itself as all spaces.
|
||||
}
|
||||
unsigned += int64(c)
|
||||
signed += int64(int8(c))
|
||||
}
|
||||
return unsigned, signed
|
||||
}
|
||||
|
||||
// Reset clears the block with all zeros.
|
||||
func (b *block) Reset() {
|
||||
*b = block{}
|
||||
}
|
||||
|
||||
type headerV7 [blockSize]byte
|
||||
|
||||
func (h *headerV7) Name() []byte { return h[000:][:100] }
|
||||
func (h *headerV7) Mode() []byte { return h[100:][:8] }
|
||||
func (h *headerV7) UID() []byte { return h[108:][:8] }
|
||||
func (h *headerV7) GID() []byte { return h[116:][:8] }
|
||||
func (h *headerV7) Size() []byte { return h[124:][:12] }
|
||||
func (h *headerV7) ModTime() []byte { return h[136:][:12] }
|
||||
func (h *headerV7) Chksum() []byte { return h[148:][:8] }
|
||||
func (h *headerV7) TypeFlag() []byte { return h[156:][:1] }
|
||||
func (h *headerV7) LinkName() []byte { return h[157:][:100] }
|
||||
|
||||
type headerGNU [blockSize]byte
|
||||
|
||||
func (h *headerGNU) V7() *headerV7 { return (*headerV7)(h) }
|
||||
func (h *headerGNU) Magic() []byte { return h[257:][:6] }
|
||||
func (h *headerGNU) Version() []byte { return h[263:][:2] }
|
||||
func (h *headerGNU) UserName() []byte { return h[265:][:32] }
|
||||
func (h *headerGNU) GroupName() []byte { return h[297:][:32] }
|
||||
func (h *headerGNU) DevMajor() []byte { return h[329:][:8] }
|
||||
func (h *headerGNU) DevMinor() []byte { return h[337:][:8] }
|
||||
func (h *headerGNU) AccessTime() []byte { return h[345:][:12] }
|
||||
func (h *headerGNU) ChangeTime() []byte { return h[357:][:12] }
|
||||
func (h *headerGNU) Sparse() sparseArray { return (sparseArray)(h[386:][:24*4+1]) }
|
||||
func (h *headerGNU) RealSize() []byte { return h[483:][:12] }
|
||||
|
||||
type headerSTAR [blockSize]byte
|
||||
|
||||
func (h *headerSTAR) V7() *headerV7 { return (*headerV7)(h) }
|
||||
func (h *headerSTAR) Magic() []byte { return h[257:][:6] }
|
||||
func (h *headerSTAR) Version() []byte { return h[263:][:2] }
|
||||
func (h *headerSTAR) UserName() []byte { return h[265:][:32] }
|
||||
func (h *headerSTAR) GroupName() []byte { return h[297:][:32] }
|
||||
func (h *headerSTAR) DevMajor() []byte { return h[329:][:8] }
|
||||
func (h *headerSTAR) DevMinor() []byte { return h[337:][:8] }
|
||||
func (h *headerSTAR) Prefix() []byte { return h[345:][:131] }
|
||||
func (h *headerSTAR) AccessTime() []byte { return h[476:][:12] }
|
||||
func (h *headerSTAR) ChangeTime() []byte { return h[488:][:12] }
|
||||
func (h *headerSTAR) Trailer() []byte { return h[508:][:4] }
|
||||
|
||||
type headerUSTAR [blockSize]byte
|
||||
|
||||
func (h *headerUSTAR) V7() *headerV7 { return (*headerV7)(h) }
|
||||
func (h *headerUSTAR) Magic() []byte { return h[257:][:6] }
|
||||
func (h *headerUSTAR) Version() []byte { return h[263:][:2] }
|
||||
func (h *headerUSTAR) UserName() []byte { return h[265:][:32] }
|
||||
func (h *headerUSTAR) GroupName() []byte { return h[297:][:32] }
|
||||
func (h *headerUSTAR) DevMajor() []byte { return h[329:][:8] }
|
||||
func (h *headerUSTAR) DevMinor() []byte { return h[337:][:8] }
|
||||
func (h *headerUSTAR) Prefix() []byte { return h[345:][:155] }
|
||||
|
||||
type sparseArray []byte
|
||||
|
||||
func (s sparseArray) Entry(i int) sparseElem { return (sparseElem)(s[i*24:]) }
|
||||
func (s sparseArray) IsExtended() []byte { return s[24*s.MaxEntries():][:1] }
|
||||
func (s sparseArray) MaxEntries() int { return len(s) / 24 }
|
||||
|
||||
type sparseElem []byte
|
||||
|
||||
func (s sparseElem) Offset() []byte { return s[00:][:12] }
|
||||
func (s sparseElem) Length() []byte { return s[12:][:12] }
|
||||
855
vendor/archive/tar/reader.go
vendored
Normal file
855
vendor/archive/tar/reader.go
vendored
Normal file
|
|
@ -0,0 +1,855 @@
|
|||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package tar
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"strconv"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Reader provides sequential access to the contents of a tar archive.
|
||||
// Reader.Next advances to the next file in the archive (including the first),
|
||||
// and then Reader can be treated as an io.Reader to access the file's data.
|
||||
type Reader struct {
|
||||
r io.Reader
|
||||
pad int64 // Amount of padding (ignored) after current file entry
|
||||
curr fileReader // Reader for current file entry
|
||||
blk block // Buffer to use as temporary local storage
|
||||
|
||||
// err is a persistent error.
|
||||
// It is only the responsibility of every exported method of Reader to
|
||||
// ensure that this error is sticky.
|
||||
err error
|
||||
}
|
||||
|
||||
type fileReader interface {
|
||||
io.Reader
|
||||
fileState
|
||||
|
||||
WriteTo(io.Writer) (int64, error)
|
||||
}
|
||||
|
||||
// NewReader creates a new Reader reading from r.
|
||||
func NewReader(r io.Reader) *Reader {
|
||||
return &Reader{r: r, curr: ®FileReader{r, 0}}
|
||||
}
|
||||
|
||||
// Next advances to the next entry in the tar archive.
|
||||
// The Header.Size determines how many bytes can be read for the next file.
|
||||
// Any remaining data in the current file is automatically discarded.
|
||||
//
|
||||
// io.EOF is returned at the end of the input.
|
||||
func (tr *Reader) Next() (*Header, error) {
|
||||
if tr.err != nil {
|
||||
return nil, tr.err
|
||||
}
|
||||
hdr, err := tr.next()
|
||||
tr.err = err
|
||||
return hdr, err
|
||||
}
|
||||
|
||||
func (tr *Reader) next() (*Header, error) {
|
||||
var paxHdrs map[string]string
|
||||
var gnuLongName, gnuLongLink string
|
||||
|
||||
// Externally, Next iterates through the tar archive as if it is a series of
|
||||
// files. Internally, the tar format often uses fake "files" to add meta
|
||||
// data that describes the next file. These meta data "files" should not
|
||||
// normally be visible to the outside. As such, this loop iterates through
|
||||
// one or more "header files" until it finds a "normal file".
|
||||
format := FormatUSTAR | FormatPAX | FormatGNU
|
||||
loop:
|
||||
for {
|
||||
// Discard the remainder of the file and any padding.
|
||||
if err := discard(tr.r, tr.curr.PhysicalRemaining()); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if _, err := tryReadFull(tr.r, tr.blk[:tr.pad]); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
tr.pad = 0
|
||||
|
||||
hdr, rawHdr, err := tr.readHeader()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if err := tr.handleRegularFile(hdr); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
format.mayOnlyBe(hdr.Format)
|
||||
|
||||
// Check for PAX/GNU special headers and files.
|
||||
switch hdr.Typeflag {
|
||||
case TypeXHeader, TypeXGlobalHeader:
|
||||
format.mayOnlyBe(FormatPAX)
|
||||
paxHdrs, err = parsePAX(tr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if hdr.Typeflag == TypeXGlobalHeader {
|
||||
mergePAX(hdr, paxHdrs)
|
||||
return &Header{
|
||||
Name: hdr.Name,
|
||||
Typeflag: hdr.Typeflag,
|
||||
Xattrs: hdr.Xattrs,
|
||||
PAXRecords: hdr.PAXRecords,
|
||||
Format: format,
|
||||
}, nil
|
||||
}
|
||||
continue loop // This is a meta header affecting the next header
|
||||
case TypeGNULongName, TypeGNULongLink:
|
||||
format.mayOnlyBe(FormatGNU)
|
||||
realname, err := ioutil.ReadAll(tr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var p parser
|
||||
switch hdr.Typeflag {
|
||||
case TypeGNULongName:
|
||||
gnuLongName = p.parseString(realname)
|
||||
case TypeGNULongLink:
|
||||
gnuLongLink = p.parseString(realname)
|
||||
}
|
||||
continue loop // This is a meta header affecting the next header
|
||||
default:
|
||||
// The old GNU sparse format is handled here since it is technically
|
||||
// just a regular file with additional attributes.
|
||||
|
||||
if err := mergePAX(hdr, paxHdrs); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if gnuLongName != "" {
|
||||
hdr.Name = gnuLongName
|
||||
}
|
||||
if gnuLongLink != "" {
|
||||
hdr.Linkname = gnuLongLink
|
||||
}
|
||||
if hdr.Typeflag == TypeRegA && strings.HasSuffix(hdr.Name, "/") {
|
||||
hdr.Typeflag = TypeDir // Legacy archives use trailing slash for directories
|
||||
}
|
||||
|
||||
// The extended headers may have updated the size.
|
||||
// Thus, setup the regFileReader again after merging PAX headers.
|
||||
if err := tr.handleRegularFile(hdr); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Sparse formats rely on being able to read from the logical data
|
||||
// section; there must be a preceding call to handleRegularFile.
|
||||
if err := tr.handleSparseFile(hdr, rawHdr); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Set the final guess at the format.
|
||||
if format.has(FormatUSTAR) && format.has(FormatPAX) {
|
||||
format.mayOnlyBe(FormatUSTAR)
|
||||
}
|
||||
hdr.Format = format
|
||||
return hdr, nil // This is a file, so stop
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// handleRegularFile sets up the current file reader and padding such that it
|
||||
// can only read the following logical data section. It will properly handle
|
||||
// special headers that contain no data section.
|
||||
func (tr *Reader) handleRegularFile(hdr *Header) error {
|
||||
nb := hdr.Size
|
||||
if isHeaderOnlyType(hdr.Typeflag) {
|
||||
nb = 0
|
||||
}
|
||||
if nb < 0 {
|
||||
return ErrHeader
|
||||
}
|
||||
|
||||
tr.pad = blockPadding(nb)
|
||||
tr.curr = ®FileReader{r: tr.r, nb: nb}
|
||||
return nil
|
||||
}
|
||||
|
||||
// handleSparseFile checks if the current file is a sparse format of any type
|
||||
// and sets the curr reader appropriately.
|
||||
func (tr *Reader) handleSparseFile(hdr *Header, rawHdr *block) error {
|
||||
var spd sparseDatas
|
||||
var err error
|
||||
if hdr.Typeflag == TypeGNUSparse {
|
||||
spd, err = tr.readOldGNUSparseMap(hdr, rawHdr)
|
||||
} else {
|
||||
spd, err = tr.readGNUSparsePAXHeaders(hdr)
|
||||
}
|
||||
|
||||
// If sp is non-nil, then this is a sparse file.
|
||||
// Note that it is possible for len(sp) == 0.
|
||||
if err == nil && spd != nil {
|
||||
if isHeaderOnlyType(hdr.Typeflag) || !validateSparseEntries(spd, hdr.Size) {
|
||||
return ErrHeader
|
||||
}
|
||||
sph := invertSparseEntries(spd, hdr.Size)
|
||||
tr.curr = &sparseFileReader{tr.curr, sph, 0}
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
// readGNUSparsePAXHeaders checks the PAX headers for GNU sparse headers.
|
||||
// If they are found, then this function reads the sparse map and returns it.
|
||||
// This assumes that 0.0 headers have already been converted to 0.1 headers
|
||||
// by the the PAX header parsing logic.
|
||||
func (tr *Reader) readGNUSparsePAXHeaders(hdr *Header) (sparseDatas, error) {
|
||||
// Identify the version of GNU headers.
|
||||
var is1x0 bool
|
||||
major, minor := hdr.PAXRecords[paxGNUSparseMajor], hdr.PAXRecords[paxGNUSparseMinor]
|
||||
switch {
|
||||
case major == "0" && (minor == "0" || minor == "1"):
|
||||
is1x0 = false
|
||||
case major == "1" && minor == "0":
|
||||
is1x0 = true
|
||||
case major != "" || minor != "":
|
||||
return nil, nil // Unknown GNU sparse PAX version
|
||||
case hdr.PAXRecords[paxGNUSparseMap] != "":
|
||||
is1x0 = false // 0.0 and 0.1 did not have explicit version records, so guess
|
||||
default:
|
||||
return nil, nil // Not a PAX format GNU sparse file.
|
||||
}
|
||||
hdr.Format.mayOnlyBe(FormatPAX)
|
||||
|
||||
// Update hdr from GNU sparse PAX headers.
|
||||
if name := hdr.PAXRecords[paxGNUSparseName]; name != "" {
|
||||
hdr.Name = name
|
||||
}
|
||||
size := hdr.PAXRecords[paxGNUSparseSize]
|
||||
if size == "" {
|
||||
size = hdr.PAXRecords[paxGNUSparseRealSize]
|
||||
}
|
||||
if size != "" {
|
||||
n, err := strconv.ParseInt(size, 10, 64)
|
||||
if err != nil {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
hdr.Size = n
|
||||
}
|
||||
|
||||
// Read the sparse map according to the appropriate format.
|
||||
if is1x0 {
|
||||
return readGNUSparseMap1x0(tr.curr)
|
||||
}
|
||||
return readGNUSparseMap0x1(hdr.PAXRecords)
|
||||
}
|
||||
|
||||
// mergePAX merges paxHdrs into hdr for all relevant fields of Header.
|
||||
func mergePAX(hdr *Header, paxHdrs map[string]string) (err error) {
|
||||
for k, v := range paxHdrs {
|
||||
if v == "" {
|
||||
continue // Keep the original USTAR value
|
||||
}
|
||||
var id64 int64
|
||||
switch k {
|
||||
case paxPath:
|
||||
hdr.Name = v
|
||||
case paxLinkpath:
|
||||
hdr.Linkname = v
|
||||
case paxUname:
|
||||
hdr.Uname = v
|
||||
case paxGname:
|
||||
hdr.Gname = v
|
||||
case paxUid:
|
||||
id64, err = strconv.ParseInt(v, 10, 64)
|
||||
hdr.Uid = int(id64) // Integer overflow possible
|
||||
case paxGid:
|
||||
id64, err = strconv.ParseInt(v, 10, 64)
|
||||
hdr.Gid = int(id64) // Integer overflow possible
|
||||
case paxAtime:
|
||||
hdr.AccessTime, err = parsePAXTime(v)
|
||||
case paxMtime:
|
||||
hdr.ModTime, err = parsePAXTime(v)
|
||||
case paxCtime:
|
||||
hdr.ChangeTime, err = parsePAXTime(v)
|
||||
case paxSize:
|
||||
hdr.Size, err = strconv.ParseInt(v, 10, 64)
|
||||
default:
|
||||
if strings.HasPrefix(k, paxSchilyXattr) {
|
||||
if hdr.Xattrs == nil {
|
||||
hdr.Xattrs = make(map[string]string)
|
||||
}
|
||||
hdr.Xattrs[k[len(paxSchilyXattr):]] = v
|
||||
}
|
||||
}
|
||||
if err != nil {
|
||||
return ErrHeader
|
||||
}
|
||||
}
|
||||
hdr.PAXRecords = paxHdrs
|
||||
return nil
|
||||
}
|
||||
|
||||
// parsePAX parses PAX headers.
|
||||
// If an extended header (type 'x') is invalid, ErrHeader is returned
|
||||
func parsePAX(r io.Reader) (map[string]string, error) {
|
||||
buf, err := ioutil.ReadAll(r)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
sbuf := string(buf)
|
||||
|
||||
// For GNU PAX sparse format 0.0 support.
|
||||
// This function transforms the sparse format 0.0 headers into format 0.1
|
||||
// headers since 0.0 headers were not PAX compliant.
|
||||
var sparseMap []string
|
||||
|
||||
paxHdrs := make(map[string]string)
|
||||
for len(sbuf) > 0 {
|
||||
key, value, residual, err := parsePAXRecord(sbuf)
|
||||
if err != nil {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
sbuf = residual
|
||||
|
||||
switch key {
|
||||
case paxGNUSparseOffset, paxGNUSparseNumBytes:
|
||||
// Validate sparse header order and value.
|
||||
if (len(sparseMap)%2 == 0 && key != paxGNUSparseOffset) ||
|
||||
(len(sparseMap)%2 == 1 && key != paxGNUSparseNumBytes) ||
|
||||
strings.Contains(value, ",") {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
sparseMap = append(sparseMap, value)
|
||||
default:
|
||||
paxHdrs[key] = value
|
||||
}
|
||||
}
|
||||
if len(sparseMap) > 0 {
|
||||
paxHdrs[paxGNUSparseMap] = strings.Join(sparseMap, ",")
|
||||
}
|
||||
return paxHdrs, nil
|
||||
}
|
||||
|
||||
// readHeader reads the next block header and assumes that the underlying reader
|
||||
// is already aligned to a block boundary. It returns the raw block of the
|
||||
// header in case further processing is required.
|
||||
//
|
||||
// The err will be set to io.EOF only when one of the following occurs:
|
||||
// * Exactly 0 bytes are read and EOF is hit.
|
||||
// * Exactly 1 block of zeros is read and EOF is hit.
|
||||
// * At least 2 blocks of zeros are read.
|
||||
func (tr *Reader) readHeader() (*Header, *block, error) {
|
||||
// Two blocks of zero bytes marks the end of the archive.
|
||||
if _, err := io.ReadFull(tr.r, tr.blk[:]); err != nil {
|
||||
return nil, nil, err // EOF is okay here; exactly 0 bytes read
|
||||
}
|
||||
if bytes.Equal(tr.blk[:], zeroBlock[:]) {
|
||||
if _, err := io.ReadFull(tr.r, tr.blk[:]); err != nil {
|
||||
return nil, nil, err // EOF is okay here; exactly 1 block of zeros read
|
||||
}
|
||||
if bytes.Equal(tr.blk[:], zeroBlock[:]) {
|
||||
return nil, nil, io.EOF // normal EOF; exactly 2 block of zeros read
|
||||
}
|
||||
return nil, nil, ErrHeader // Zero block and then non-zero block
|
||||
}
|
||||
|
||||
// Verify the header matches a known format.
|
||||
format := tr.blk.GetFormat()
|
||||
if format == FormatUnknown {
|
||||
return nil, nil, ErrHeader
|
||||
}
|
||||
|
||||
var p parser
|
||||
hdr := new(Header)
|
||||
|
||||
// Unpack the V7 header.
|
||||
v7 := tr.blk.V7()
|
||||
hdr.Typeflag = v7.TypeFlag()[0]
|
||||
hdr.Name = p.parseString(v7.Name())
|
||||
hdr.Linkname = p.parseString(v7.LinkName())
|
||||
hdr.Size = p.parseNumeric(v7.Size())
|
||||
hdr.Mode = p.parseNumeric(v7.Mode())
|
||||
hdr.Uid = int(p.parseNumeric(v7.UID()))
|
||||
hdr.Gid = int(p.parseNumeric(v7.GID()))
|
||||
hdr.ModTime = time.Unix(p.parseNumeric(v7.ModTime()), 0)
|
||||
|
||||
// Unpack format specific fields.
|
||||
if format > formatV7 {
|
||||
ustar := tr.blk.USTAR()
|
||||
hdr.Uname = p.parseString(ustar.UserName())
|
||||
hdr.Gname = p.parseString(ustar.GroupName())
|
||||
hdr.Devmajor = p.parseNumeric(ustar.DevMajor())
|
||||
hdr.Devminor = p.parseNumeric(ustar.DevMinor())
|
||||
|
||||
var prefix string
|
||||
switch {
|
||||
case format.has(FormatUSTAR | FormatPAX):
|
||||
hdr.Format = format
|
||||
ustar := tr.blk.USTAR()
|
||||
prefix = p.parseString(ustar.Prefix())
|
||||
|
||||
// For Format detection, check if block is properly formatted since
|
||||
// the parser is more liberal than what USTAR actually permits.
|
||||
notASCII := func(r rune) bool { return r >= 0x80 }
|
||||
if bytes.IndexFunc(tr.blk[:], notASCII) >= 0 {
|
||||
hdr.Format = FormatUnknown // Non-ASCII characters in block.
|
||||
}
|
||||
nul := func(b []byte) bool { return int(b[len(b)-1]) == 0 }
|
||||
if !(nul(v7.Size()) && nul(v7.Mode()) && nul(v7.UID()) && nul(v7.GID()) &&
|
||||
nul(v7.ModTime()) && nul(ustar.DevMajor()) && nul(ustar.DevMinor())) {
|
||||
hdr.Format = FormatUnknown // Numeric fields must end in NUL
|
||||
}
|
||||
case format.has(formatSTAR):
|
||||
star := tr.blk.STAR()
|
||||
prefix = p.parseString(star.Prefix())
|
||||
hdr.AccessTime = time.Unix(p.parseNumeric(star.AccessTime()), 0)
|
||||
hdr.ChangeTime = time.Unix(p.parseNumeric(star.ChangeTime()), 0)
|
||||
case format.has(FormatGNU):
|
||||
hdr.Format = format
|
||||
var p2 parser
|
||||
gnu := tr.blk.GNU()
|
||||
if b := gnu.AccessTime(); b[0] != 0 {
|
||||
hdr.AccessTime = time.Unix(p2.parseNumeric(b), 0)
|
||||
}
|
||||
if b := gnu.ChangeTime(); b[0] != 0 {
|
||||
hdr.ChangeTime = time.Unix(p2.parseNumeric(b), 0)
|
||||
}
|
||||
|
||||
// Prior to Go1.8, the Writer had a bug where it would output
|
||||
// an invalid tar file in certain rare situations because the logic
|
||||
// incorrectly believed that the old GNU format had a prefix field.
|
||||
// This is wrong and leads to an output file that mangles the
|
||||
// atime and ctime fields, which are often left unused.
|
||||
//
|
||||
// In order to continue reading tar files created by former, buggy
|
||||
// versions of Go, we skeptically parse the atime and ctime fields.
|
||||
// If we are unable to parse them and the prefix field looks like
|
||||
// an ASCII string, then we fallback on the pre-Go1.8 behavior
|
||||
// of treating these fields as the USTAR prefix field.
|
||||
//
|
||||
// Note that this will not use the fallback logic for all possible
|
||||
// files generated by a pre-Go1.8 toolchain. If the generated file
|
||||
// happened to have a prefix field that parses as valid
|
||||
// atime and ctime fields (e.g., when they are valid octal strings),
|
||||
// then it is impossible to distinguish between an valid GNU file
|
||||
// and an invalid pre-Go1.8 file.
|
||||
//
|
||||
// See https://golang.org/issues/12594
|
||||
// See https://golang.org/issues/21005
|
||||
if p2.err != nil {
|
||||
hdr.AccessTime, hdr.ChangeTime = time.Time{}, time.Time{}
|
||||
ustar := tr.blk.USTAR()
|
||||
if s := p.parseString(ustar.Prefix()); isASCII(s) {
|
||||
prefix = s
|
||||
}
|
||||
hdr.Format = FormatUnknown // Buggy file is not GNU
|
||||
}
|
||||
}
|
||||
if len(prefix) > 0 {
|
||||
hdr.Name = prefix + "/" + hdr.Name
|
||||
}
|
||||
}
|
||||
return hdr, &tr.blk, p.err
|
||||
}
|
||||
|
||||
// readOldGNUSparseMap reads the sparse map from the old GNU sparse format.
|
||||
// The sparse map is stored in the tar header if it's small enough.
|
||||
// If it's larger than four entries, then one or more extension headers are used
|
||||
// to store the rest of the sparse map.
|
||||
//
|
||||
// The Header.Size does not reflect the size of any extended headers used.
|
||||
// Thus, this function will read from the raw io.Reader to fetch extra headers.
|
||||
// This method mutates blk in the process.
|
||||
func (tr *Reader) readOldGNUSparseMap(hdr *Header, blk *block) (sparseDatas, error) {
|
||||
// Make sure that the input format is GNU.
|
||||
// Unfortunately, the STAR format also has a sparse header format that uses
|
||||
// the same type flag but has a completely different layout.
|
||||
if blk.GetFormat() != FormatGNU {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
hdr.Format.mayOnlyBe(FormatGNU)
|
||||
|
||||
var p parser
|
||||
hdr.Size = p.parseNumeric(blk.GNU().RealSize())
|
||||
if p.err != nil {
|
||||
return nil, p.err
|
||||
}
|
||||
s := blk.GNU().Sparse()
|
||||
spd := make(sparseDatas, 0, s.MaxEntries())
|
||||
for {
|
||||
for i := 0; i < s.MaxEntries(); i++ {
|
||||
// This termination condition is identical to GNU and BSD tar.
|
||||
if s.Entry(i).Offset()[0] == 0x00 {
|
||||
break // Don't return, need to process extended headers (even if empty)
|
||||
}
|
||||
offset := p.parseNumeric(s.Entry(i).Offset())
|
||||
length := p.parseNumeric(s.Entry(i).Length())
|
||||
if p.err != nil {
|
||||
return nil, p.err
|
||||
}
|
||||
spd = append(spd, sparseEntry{Offset: offset, Length: length})
|
||||
}
|
||||
|
||||
if s.IsExtended()[0] > 0 {
|
||||
// There are more entries. Read an extension header and parse its entries.
|
||||
if _, err := mustReadFull(tr.r, blk[:]); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
s = blk.Sparse()
|
||||
continue
|
||||
}
|
||||
return spd, nil // Done
|
||||
}
|
||||
}
|
||||
|
||||
// readGNUSparseMap1x0 reads the sparse map as stored in GNU's PAX sparse format
|
||||
// version 1.0. The format of the sparse map consists of a series of
|
||||
// newline-terminated numeric fields. The first field is the number of entries
|
||||
// and is always present. Following this are the entries, consisting of two
|
||||
// fields (offset, length). This function must stop reading at the end
|
||||
// boundary of the block containing the last newline.
|
||||
//
|
||||
// Note that the GNU manual says that numeric values should be encoded in octal
|
||||
// format. However, the GNU tar utility itself outputs these values in decimal.
|
||||
// As such, this library treats values as being encoded in decimal.
|
||||
func readGNUSparseMap1x0(r io.Reader) (sparseDatas, error) {
|
||||
var (
|
||||
cntNewline int64
|
||||
buf bytes.Buffer
|
||||
blk block
|
||||
)
|
||||
|
||||
// feedTokens copies data in blocks from r into buf until there are
|
||||
// at least cnt newlines in buf. It will not read more blocks than needed.
|
||||
feedTokens := func(n int64) error {
|
||||
for cntNewline < n {
|
||||
if _, err := mustReadFull(r, blk[:]); err != nil {
|
||||
return err
|
||||
}
|
||||
buf.Write(blk[:])
|
||||
for _, c := range blk {
|
||||
if c == '\n' {
|
||||
cntNewline++
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// nextToken gets the next token delimited by a newline. This assumes that
|
||||
// at least one newline exists in the buffer.
|
||||
nextToken := func() string {
|
||||
cntNewline--
|
||||
tok, _ := buf.ReadString('\n')
|
||||
return strings.TrimRight(tok, "\n")
|
||||
}
|
||||
|
||||
// Parse for the number of entries.
|
||||
// Use integer overflow resistant math to check this.
|
||||
if err := feedTokens(1); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
numEntries, err := strconv.ParseInt(nextToken(), 10, 0) // Intentionally parse as native int
|
||||
if err != nil || numEntries < 0 || int(2*numEntries) < int(numEntries) {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
|
||||
// Parse for all member entries.
|
||||
// numEntries is trusted after this since a potential attacker must have
|
||||
// committed resources proportional to what this library used.
|
||||
if err := feedTokens(2 * numEntries); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
spd := make(sparseDatas, 0, numEntries)
|
||||
for i := int64(0); i < numEntries; i++ {
|
||||
offset, err1 := strconv.ParseInt(nextToken(), 10, 64)
|
||||
length, err2 := strconv.ParseInt(nextToken(), 10, 64)
|
||||
if err1 != nil || err2 != nil {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
spd = append(spd, sparseEntry{Offset: offset, Length: length})
|
||||
}
|
||||
return spd, nil
|
||||
}
|
||||
|
||||
// readGNUSparseMap0x1 reads the sparse map as stored in GNU's PAX sparse format
|
||||
// version 0.1. The sparse map is stored in the PAX headers.
|
||||
func readGNUSparseMap0x1(paxHdrs map[string]string) (sparseDatas, error) {
|
||||
// Get number of entries.
|
||||
// Use integer overflow resistant math to check this.
|
||||
numEntriesStr := paxHdrs[paxGNUSparseNumBlocks]
|
||||
numEntries, err := strconv.ParseInt(numEntriesStr, 10, 0) // Intentionally parse as native int
|
||||
if err != nil || numEntries < 0 || int(2*numEntries) < int(numEntries) {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
|
||||
// There should be two numbers in sparseMap for each entry.
|
||||
sparseMap := strings.Split(paxHdrs[paxGNUSparseMap], ",")
|
||||
if len(sparseMap) == 1 && sparseMap[0] == "" {
|
||||
sparseMap = sparseMap[:0]
|
||||
}
|
||||
if int64(len(sparseMap)) != 2*numEntries {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
|
||||
// Loop through the entries in the sparse map.
|
||||
// numEntries is trusted now.
|
||||
spd := make(sparseDatas, 0, numEntries)
|
||||
for len(sparseMap) >= 2 {
|
||||
offset, err1 := strconv.ParseInt(sparseMap[0], 10, 64)
|
||||
length, err2 := strconv.ParseInt(sparseMap[1], 10, 64)
|
||||
if err1 != nil || err2 != nil {
|
||||
return nil, ErrHeader
|
||||
}
|
||||
spd = append(spd, sparseEntry{Offset: offset, Length: length})
|
||||
sparseMap = sparseMap[2:]
|
||||
}
|
||||
return spd, nil
|
||||
}
|
||||
|
||||
// Read reads from the current file in the tar archive.
|
||||
// It returns (0, io.EOF) when it reaches the end of that file,
|
||||
// until Next is called to advance to the next file.
|
||||
//
|
||||
// If the current file is sparse, then the regions marked as a hole
|
||||
// are read back as NUL-bytes.
|
||||
//
|
||||
// Calling Read on special types like TypeLink, TypeSymlink, TypeChar,
|
||||
// TypeBlock, TypeDir, and TypeFifo returns (0, io.EOF) regardless of what
|
||||
// the Header.Size claims.
|
||||
func (tr *Reader) Read(b []byte) (int, error) {
|
||||
if tr.err != nil {
|
||||
return 0, tr.err
|
||||
}
|
||||
n, err := tr.curr.Read(b)
|
||||
if err != nil && err != io.EOF {
|
||||
tr.err = err
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
// writeTo writes the content of the current file to w.
|
||||
// The bytes written matches the number of remaining bytes in the current file.
|
||||
//
|
||||
// If the current file is sparse and w is an io.WriteSeeker,
|
||||
// then writeTo uses Seek to skip past holes defined in Header.SparseHoles,
|
||||
// assuming that skipped regions are filled with NULs.
|
||||
// This always writes the last byte to ensure w is the right size.
|
||||
//
|
||||
// TODO(dsnet): Re-export this when adding sparse file support.
|
||||
// See https://golang.org/issue/22735
|
||||
func (tr *Reader) writeTo(w io.Writer) (int64, error) {
|
||||
if tr.err != nil {
|
||||
return 0, tr.err
|
||||
}
|
||||
n, err := tr.curr.WriteTo(w)
|
||||
if err != nil {
|
||||
tr.err = err
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
// regFileReader is a fileReader for reading data from a regular file entry.
|
||||
type regFileReader struct {
|
||||
r io.Reader // Underlying Reader
|
||||
nb int64 // Number of remaining bytes to read
|
||||
}
|
||||
|
||||
func (fr *regFileReader) Read(b []byte) (n int, err error) {
|
||||
if int64(len(b)) > fr.nb {
|
||||
b = b[:fr.nb]
|
||||
}
|
||||
if len(b) > 0 {
|
||||
n, err = fr.r.Read(b)
|
||||
fr.nb -= int64(n)
|
||||
}
|
||||
switch {
|
||||
case err == io.EOF && fr.nb > 0:
|
||||
return n, io.ErrUnexpectedEOF
|
||||
case err == nil && fr.nb == 0:
|
||||
return n, io.EOF
|
||||
default:
|
||||
return n, err
|
||||
}
|
||||
}
|
||||
|
||||
func (fr *regFileReader) WriteTo(w io.Writer) (int64, error) {
|
||||
return io.Copy(w, struct{ io.Reader }{fr})
|
||||
}
|
||||
|
||||
func (fr regFileReader) LogicalRemaining() int64 {
|
||||
return fr.nb
|
||||
}
|
||||
|
||||
func (fr regFileReader) PhysicalRemaining() int64 {
|
||||
return fr.nb
|
||||
}
|
||||
|
||||
// sparseFileReader is a fileReader for reading data from a sparse file entry.
|
||||
type sparseFileReader struct {
|
||||
fr fileReader // Underlying fileReader
|
||||
sp sparseHoles // Normalized list of sparse holes
|
||||
pos int64 // Current position in sparse file
|
||||
}
|
||||
|
||||
func (sr *sparseFileReader) Read(b []byte) (n int, err error) {
|
||||
finished := int64(len(b)) >= sr.LogicalRemaining()
|
||||
if finished {
|
||||
b = b[:sr.LogicalRemaining()]
|
||||
}
|
||||
|
||||
b0 := b
|
||||
endPos := sr.pos + int64(len(b))
|
||||
for endPos > sr.pos && err == nil {
|
||||
var nf int // Bytes read in fragment
|
||||
holeStart, holeEnd := sr.sp[0].Offset, sr.sp[0].endOffset()
|
||||
if sr.pos < holeStart { // In a data fragment
|
||||
bf := b[:min(int64(len(b)), holeStart-sr.pos)]
|
||||
nf, err = tryReadFull(sr.fr, bf)
|
||||
} else { // In a hole fragment
|
||||
bf := b[:min(int64(len(b)), holeEnd-sr.pos)]
|
||||
nf, err = tryReadFull(zeroReader{}, bf)
|
||||
}
|
||||
b = b[nf:]
|
||||
sr.pos += int64(nf)
|
||||
if sr.pos >= holeEnd && len(sr.sp) > 1 {
|
||||
sr.sp = sr.sp[1:] // Ensure last fragment always remains
|
||||
}
|
||||
}
|
||||
|
||||
n = len(b0) - len(b)
|
||||
switch {
|
||||
case err == io.EOF:
|
||||
return n, errMissData // Less data in dense file than sparse file
|
||||
case err != nil:
|
||||
return n, err
|
||||
case sr.LogicalRemaining() == 0 && sr.PhysicalRemaining() > 0:
|
||||
return n, errUnrefData // More data in dense file than sparse file
|
||||
case finished:
|
||||
return n, io.EOF
|
||||
default:
|
||||
return n, nil
|
||||
}
|
||||
}
|
||||
|
||||
func (sr *sparseFileReader) WriteTo(w io.Writer) (n int64, err error) {
|
||||
ws, ok := w.(io.WriteSeeker)
|
||||
if ok {
|
||||
if _, err := ws.Seek(0, io.SeekCurrent); err != nil {
|
||||
ok = false // Not all io.Seeker can really seek
|
||||
}
|
||||
}
|
||||
if !ok {
|
||||
return io.Copy(w, struct{ io.Reader }{sr})
|
||||
}
|
||||
|
||||
var writeLastByte bool
|
||||
pos0 := sr.pos
|
||||
for sr.LogicalRemaining() > 0 && !writeLastByte && err == nil {
|
||||
var nf int64 // Size of fragment
|
||||
holeStart, holeEnd := sr.sp[0].Offset, sr.sp[0].endOffset()
|
||||
if sr.pos < holeStart { // In a data fragment
|
||||
nf = holeStart - sr.pos
|
||||
nf, err = io.CopyN(ws, sr.fr, nf)
|
||||
} else { // In a hole fragment
|
||||
nf = holeEnd - sr.pos
|
||||
if sr.PhysicalRemaining() == 0 {
|
||||
writeLastByte = true
|
||||
nf--
|
||||
}
|
||||
_, err = ws.Seek(nf, io.SeekCurrent)
|
||||
}
|
||||
sr.pos += nf
|
||||
if sr.pos >= holeEnd && len(sr.sp) > 1 {
|
||||
sr.sp = sr.sp[1:] // Ensure last fragment always remains
|
||||
}
|
||||
}
|
||||
|
||||
// If the last fragment is a hole, then seek to 1-byte before EOF, and
|
||||
// write a single byte to ensure the file is the right size.
|
||||
if writeLastByte && err == nil {
|
||||
_, err = ws.Write([]byte{0})
|
||||
sr.pos++
|
||||
}
|
||||
|
||||
n = sr.pos - pos0
|
||||
switch {
|
||||
case err == io.EOF:
|
||||
return n, errMissData // Less data in dense file than sparse file
|
||||
case err != nil:
|
||||
return n, err
|
||||
case sr.LogicalRemaining() == 0 && sr.PhysicalRemaining() > 0:
|
||||
return n, errUnrefData // More data in dense file than sparse file
|
||||
default:
|
||||
return n, nil
|
||||
}
|
||||
}
|
||||
|
||||
func (sr sparseFileReader) LogicalRemaining() int64 {
|
||||
return sr.sp[len(sr.sp)-1].endOffset() - sr.pos
|
||||
}
|
||||
func (sr sparseFileReader) PhysicalRemaining() int64 {
|
||||
return sr.fr.PhysicalRemaining()
|
||||
}
|
||||
|
||||
type zeroReader struct{}
|
||||
|
||||
func (zeroReader) Read(b []byte) (int, error) {
|
||||
for i := range b {
|
||||
b[i] = 0
|
||||
}
|
||||
return len(b), nil
|
||||
}
|
||||
|
||||
// mustReadFull is like io.ReadFull except it returns
|
||||
// io.ErrUnexpectedEOF when io.EOF is hit before len(b) bytes are read.
|
||||
func mustReadFull(r io.Reader, b []byte) (int, error) {
|
||||
n, err := tryReadFull(r, b)
|
||||
if err == io.EOF {
|
||||
err = io.ErrUnexpectedEOF
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
// tryReadFull is like io.ReadFull except it returns
|
||||
// io.EOF when it is hit before len(b) bytes are read.
|
||||
func tryReadFull(r io.Reader, b []byte) (n int, err error) {
|
||||
for len(b) > n && err == nil {
|
||||
var nn int
|
||||
nn, err = r.Read(b[n:])
|
||||
n += nn
|
||||
}
|
||||
if len(b) == n && err == io.EOF {
|
||||
err = nil
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
// discard skips n bytes in r, reporting an error if unable to do so.
|
||||
func discard(r io.Reader, n int64) error {
|
||||
// If possible, Seek to the last byte before the end of the data section.
|
||||
// Do this because Seek is often lazy about reporting errors; this will mask
|
||||
// the fact that the stream may be truncated. We can rely on the
|
||||
// io.CopyN done shortly afterwards to trigger any IO errors.
|
||||
var seekSkipped int64 // Number of bytes skipped via Seek
|
||||
if sr, ok := r.(io.Seeker); ok && n > 1 {
|
||||
// Not all io.Seeker can actually Seek. For example, os.Stdin implements
|
||||
// io.Seeker, but calling Seek always returns an error and performs
|
||||
// no action. Thus, we try an innocent seek to the current position
|
||||
// to see if Seek is really supported.
|
||||
pos1, err := sr.Seek(0, io.SeekCurrent)
|
||||
if pos1 >= 0 && err == nil {
|
||||
// Seek seems supported, so perform the real Seek.
|
||||
pos2, err := sr.Seek(n-1, io.SeekCurrent)
|
||||
if pos2 < 0 || err != nil {
|
||||
return err
|
||||
}
|
||||
seekSkipped = pos2 - pos1
|
||||
}
|
||||
}
|
||||
|
||||
copySkipped, err := io.CopyN(ioutil.Discard, r, n-seekSkipped)
|
||||
if err == io.EOF && seekSkipped+copySkipped < n {
|
||||
err = io.ErrUnexpectedEOF
|
||||
}
|
||||
return err
|
||||
}
|
||||
20
vendor/archive/tar/stat_actime1.go
vendored
Normal file
20
vendor/archive/tar/stat_actime1.go
vendored
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
// Copyright 2012 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build linux dragonfly openbsd solaris
|
||||
|
||||
package tar
|
||||
|
||||
import (
|
||||
"syscall"
|
||||
"time"
|
||||
)
|
||||
|
||||
func statAtime(st *syscall.Stat_t) time.Time {
|
||||
return time.Unix(st.Atim.Unix())
|
||||
}
|
||||
|
||||
func statCtime(st *syscall.Stat_t) time.Time {
|
||||
return time.Unix(st.Ctim.Unix())
|
||||
}
|
||||
20
vendor/archive/tar/stat_actime2.go
vendored
Normal file
20
vendor/archive/tar/stat_actime2.go
vendored
Normal file
|
|
@ -0,0 +1,20 @@
|
|||
// Copyright 2012 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build darwin freebsd netbsd
|
||||
|
||||
package tar
|
||||
|
||||
import (
|
||||
"syscall"
|
||||
"time"
|
||||
)
|
||||
|
||||
func statAtime(st *syscall.Stat_t) time.Time {
|
||||
return time.Unix(st.Atimespec.Unix())
|
||||
}
|
||||
|
||||
func statCtime(st *syscall.Stat_t) time.Time {
|
||||
return time.Unix(st.Ctimespec.Unix())
|
||||
}
|
||||
76
vendor/archive/tar/stat_unix.go
vendored
Normal file
76
vendor/archive/tar/stat_unix.go
vendored
Normal file
|
|
@ -0,0 +1,76 @@
|
|||
// Copyright 2012 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build linux darwin dragonfly freebsd openbsd netbsd solaris
|
||||
|
||||
package tar
|
||||
|
||||
import (
|
||||
"os"
|
||||
"runtime"
|
||||
"syscall"
|
||||
)
|
||||
|
||||
func init() {
|
||||
sysStat = statUnix
|
||||
}
|
||||
|
||||
func statUnix(fi os.FileInfo, h *Header) error {
|
||||
sys, ok := fi.Sys().(*syscall.Stat_t)
|
||||
if !ok {
|
||||
return nil
|
||||
}
|
||||
h.Uid = int(sys.Uid)
|
||||
h.Gid = int(sys.Gid)
|
||||
|
||||
// TODO(bradfitz): populate username & group. os/user
|
||||
// doesn't cache LookupId lookups, and lacks group
|
||||
// lookup functions.
|
||||
h.AccessTime = statAtime(sys)
|
||||
h.ChangeTime = statCtime(sys)
|
||||
|
||||
// Best effort at populating Devmajor and Devminor.
|
||||
if h.Typeflag == TypeChar || h.Typeflag == TypeBlock {
|
||||
dev := uint64(sys.Rdev) // May be int32 or uint32
|
||||
switch runtime.GOOS {
|
||||
case "linux":
|
||||
// Copied from golang.org/x/sys/unix/dev_linux.go.
|
||||
major := uint32((dev & 0x00000000000fff00) >> 8)
|
||||
major |= uint32((dev & 0xfffff00000000000) >> 32)
|
||||
minor := uint32((dev & 0x00000000000000ff) >> 0)
|
||||
minor |= uint32((dev & 0x00000ffffff00000) >> 12)
|
||||
h.Devmajor, h.Devminor = int64(major), int64(minor)
|
||||
case "darwin":
|
||||
// Copied from golang.org/x/sys/unix/dev_darwin.go.
|
||||
major := uint32((dev >> 24) & 0xff)
|
||||
minor := uint32(dev & 0xffffff)
|
||||
h.Devmajor, h.Devminor = int64(major), int64(minor)
|
||||
case "dragonfly":
|
||||
// Copied from golang.org/x/sys/unix/dev_dragonfly.go.
|
||||
major := uint32((dev >> 8) & 0xff)
|
||||
minor := uint32(dev & 0xffff00ff)
|
||||
h.Devmajor, h.Devminor = int64(major), int64(minor)
|
||||
case "freebsd":
|
||||
// Copied from golang.org/x/sys/unix/dev_freebsd.go.
|
||||
major := uint32((dev >> 8) & 0xff)
|
||||
minor := uint32(dev & 0xffff00ff)
|
||||
h.Devmajor, h.Devminor = int64(major), int64(minor)
|
||||
case "netbsd":
|
||||
// Copied from golang.org/x/sys/unix/dev_netbsd.go.
|
||||
major := uint32((dev & 0x000fff00) >> 8)
|
||||
minor := uint32((dev & 0x000000ff) >> 0)
|
||||
minor |= uint32((dev & 0xfff00000) >> 12)
|
||||
h.Devmajor, h.Devminor = int64(major), int64(minor)
|
||||
case "openbsd":
|
||||
// Copied from golang.org/x/sys/unix/dev_openbsd.go.
|
||||
major := uint32((dev & 0x0000ff00) >> 8)
|
||||
minor := uint32((dev & 0x000000ff) >> 0)
|
||||
minor |= uint32((dev & 0xffff0000) >> 8)
|
||||
h.Devmajor, h.Devminor = int64(major), int64(minor)
|
||||
default:
|
||||
// TODO: Implement solaris (see https://golang.org/issue/8106)
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
326
vendor/archive/tar/strconv.go
vendored
Normal file
326
vendor/archive/tar/strconv.go
vendored
Normal file
|
|
@ -0,0 +1,326 @@
|
|||
// Copyright 2016 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package tar
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"strconv"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
// hasNUL reports whether the NUL character exists within s.
|
||||
func hasNUL(s string) bool {
|
||||
return strings.IndexByte(s, 0) >= 0
|
||||
}
|
||||
|
||||
// isASCII reports whether the input is an ASCII C-style string.
|
||||
func isASCII(s string) bool {
|
||||
for _, c := range s {
|
||||
if c >= 0x80 || c == 0x00 {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
// toASCII converts the input to an ASCII C-style string.
|
||||
// This a best effort conversion, so invalid characters are dropped.
|
||||
func toASCII(s string) string {
|
||||
if isASCII(s) {
|
||||
return s
|
||||
}
|
||||
b := make([]byte, 0, len(s))
|
||||
for _, c := range s {
|
||||
if c < 0x80 && c != 0x00 {
|
||||
b = append(b, byte(c))
|
||||
}
|
||||
}
|
||||
return string(b)
|
||||
}
|
||||
|
||||
type parser struct {
|
||||
err error // Last error seen
|
||||
}
|
||||
|
||||
type formatter struct {
|
||||
err error // Last error seen
|
||||
}
|
||||
|
||||
// parseString parses bytes as a NUL-terminated C-style string.
|
||||
// If a NUL byte is not found then the whole slice is returned as a string.
|
||||
func (*parser) parseString(b []byte) string {
|
||||
if i := bytes.IndexByte(b, 0); i >= 0 {
|
||||
return string(b[:i])
|
||||
}
|
||||
return string(b)
|
||||
}
|
||||
|
||||
// formatString copies s into b, NUL-terminating if possible.
|
||||
func (f *formatter) formatString(b []byte, s string) {
|
||||
if len(s) > len(b) {
|
||||
f.err = ErrFieldTooLong
|
||||
}
|
||||
copy(b, s)
|
||||
if len(s) < len(b) {
|
||||
b[len(s)] = 0
|
||||
}
|
||||
|
||||
// Some buggy readers treat regular files with a trailing slash
|
||||
// in the V7 path field as a directory even though the full path
|
||||
// recorded elsewhere (e.g., via PAX record) contains no trailing slash.
|
||||
if len(s) > len(b) && b[len(b)-1] == '/' {
|
||||
n := len(strings.TrimRight(s[:len(b)], "/"))
|
||||
b[n] = 0 // Replace trailing slash with NUL terminator
|
||||
}
|
||||
}
|
||||
|
||||
// fitsInBase256 reports whether x can be encoded into n bytes using base-256
|
||||
// encoding. Unlike octal encoding, base-256 encoding does not require that the
|
||||
// string ends with a NUL character. Thus, all n bytes are available for output.
|
||||
//
|
||||
// If operating in binary mode, this assumes strict GNU binary mode; which means
|
||||
// that the first byte can only be either 0x80 or 0xff. Thus, the first byte is
|
||||
// equivalent to the sign bit in two's complement form.
|
||||
func fitsInBase256(n int, x int64) bool {
|
||||
binBits := uint(n-1) * 8
|
||||
return n >= 9 || (x >= -1<<binBits && x < 1<<binBits)
|
||||
}
|
||||
|
||||
// parseNumeric parses the input as being encoded in either base-256 or octal.
|
||||
// This function may return negative numbers.
|
||||
// If parsing fails or an integer overflow occurs, err will be set.
|
||||
func (p *parser) parseNumeric(b []byte) int64 {
|
||||
// Check for base-256 (binary) format first.
|
||||
// If the first bit is set, then all following bits constitute a two's
|
||||
// complement encoded number in big-endian byte order.
|
||||
if len(b) > 0 && b[0]&0x80 != 0 {
|
||||
// Handling negative numbers relies on the following identity:
|
||||
// -a-1 == ^a
|
||||
//
|
||||
// If the number is negative, we use an inversion mask to invert the
|
||||
// data bytes and treat the value as an unsigned number.
|
||||
var inv byte // 0x00 if positive or zero, 0xff if negative
|
||||
if b[0]&0x40 != 0 {
|
||||
inv = 0xff
|
||||
}
|
||||
|
||||
var x uint64
|
||||
for i, c := range b {
|
||||
c ^= inv // Inverts c only if inv is 0xff, otherwise does nothing
|
||||
if i == 0 {
|
||||
c &= 0x7f // Ignore signal bit in first byte
|
||||
}
|
||||
if (x >> 56) > 0 {
|
||||
p.err = ErrHeader // Integer overflow
|
||||
return 0
|
||||
}
|
||||
x = x<<8 | uint64(c)
|
||||
}
|
||||
if (x >> 63) > 0 {
|
||||
p.err = ErrHeader // Integer overflow
|
||||
return 0
|
||||
}
|
||||
if inv == 0xff {
|
||||
return ^int64(x)
|
||||
}
|
||||
return int64(x)
|
||||
}
|
||||
|
||||
// Normal case is base-8 (octal) format.
|
||||
return p.parseOctal(b)
|
||||
}
|
||||
|
||||
// formatNumeric encodes x into b using base-8 (octal) encoding if possible.
|
||||
// Otherwise it will attempt to use base-256 (binary) encoding.
|
||||
func (f *formatter) formatNumeric(b []byte, x int64) {
|
||||
if fitsInOctal(len(b), x) {
|
||||
f.formatOctal(b, x)
|
||||
return
|
||||
}
|
||||
|
||||
if fitsInBase256(len(b), x) {
|
||||
for i := len(b) - 1; i >= 0; i-- {
|
||||
b[i] = byte(x)
|
||||
x >>= 8
|
||||
}
|
||||
b[0] |= 0x80 // Highest bit indicates binary format
|
||||
return
|
||||
}
|
||||
|
||||
f.formatOctal(b, 0) // Last resort, just write zero
|
||||
f.err = ErrFieldTooLong
|
||||
}
|
||||
|
||||
func (p *parser) parseOctal(b []byte) int64 {
|
||||
// Because unused fields are filled with NULs, we need
|
||||
// to skip leading NULs. Fields may also be padded with
|
||||
// spaces or NULs.
|
||||
// So we remove leading and trailing NULs and spaces to
|
||||
// be sure.
|
||||
b = bytes.Trim(b, " \x00")
|
||||
|
||||
if len(b) == 0 {
|
||||
return 0
|
||||
}
|
||||
x, perr := strconv.ParseUint(p.parseString(b), 8, 64)
|
||||
if perr != nil {
|
||||
p.err = ErrHeader
|
||||
}
|
||||
return int64(x)
|
||||
}
|
||||
|
||||
func (f *formatter) formatOctal(b []byte, x int64) {
|
||||
if !fitsInOctal(len(b), x) {
|
||||
x = 0 // Last resort, just write zero
|
||||
f.err = ErrFieldTooLong
|
||||
}
|
||||
|
||||
s := strconv.FormatInt(x, 8)
|
||||
// Add leading zeros, but leave room for a NUL.
|
||||
if n := len(b) - len(s) - 1; n > 0 {
|
||||
s = strings.Repeat("0", n) + s
|
||||
}
|
||||
f.formatString(b, s)
|
||||
}
|
||||
|
||||
// fitsInOctal reports whether the integer x fits in a field n-bytes long
|
||||
// using octal encoding with the appropriate NUL terminator.
|
||||
func fitsInOctal(n int, x int64) bool {
|
||||
octBits := uint(n-1) * 3
|
||||
return x >= 0 && (n >= 22 || x < 1<<octBits)
|
||||
}
|
||||
|
||||
// parsePAXTime takes a string of the form %d.%d as described in the PAX
|
||||
// specification. Note that this implementation allows for negative timestamps,
|
||||
// which is allowed for by the PAX specification, but not always portable.
|
||||
func parsePAXTime(s string) (time.Time, error) {
|
||||
const maxNanoSecondDigits = 9
|
||||
|
||||
// Split string into seconds and sub-seconds parts.
|
||||
ss, sn := s, ""
|
||||
if pos := strings.IndexByte(s, '.'); pos >= 0 {
|
||||
ss, sn = s[:pos], s[pos+1:]
|
||||
}
|
||||
|
||||
// Parse the seconds.
|
||||
secs, err := strconv.ParseInt(ss, 10, 64)
|
||||
if err != nil {
|
||||
return time.Time{}, ErrHeader
|
||||
}
|
||||
if len(sn) == 0 {
|
||||
return time.Unix(secs, 0), nil // No sub-second values
|
||||
}
|
||||
|
||||
// Parse the nanoseconds.
|
||||
if strings.Trim(sn, "0123456789") != "" {
|
||||
return time.Time{}, ErrHeader
|
||||
}
|
||||
if len(sn) < maxNanoSecondDigits {
|
||||
sn += strings.Repeat("0", maxNanoSecondDigits-len(sn)) // Right pad
|
||||
} else {
|
||||
sn = sn[:maxNanoSecondDigits] // Right truncate
|
||||
}
|
||||
nsecs, _ := strconv.ParseInt(sn, 10, 64) // Must succeed
|
||||
if len(ss) > 0 && ss[0] == '-' {
|
||||
return time.Unix(secs, -1*nsecs), nil // Negative correction
|
||||
}
|
||||
return time.Unix(secs, nsecs), nil
|
||||
}
|
||||
|
||||
// formatPAXTime converts ts into a time of the form %d.%d as described in the
|
||||
// PAX specification. This function is capable of negative timestamps.
|
||||
func formatPAXTime(ts time.Time) (s string) {
|
||||
secs, nsecs := ts.Unix(), ts.Nanosecond()
|
||||
if nsecs == 0 {
|
||||
return strconv.FormatInt(secs, 10)
|
||||
}
|
||||
|
||||
// If seconds is negative, then perform correction.
|
||||
sign := ""
|
||||
if secs < 0 {
|
||||
sign = "-" // Remember sign
|
||||
secs = -(secs + 1) // Add a second to secs
|
||||
nsecs = -(nsecs - 1E9) // Take that second away from nsecs
|
||||
}
|
||||
return strings.TrimRight(fmt.Sprintf("%s%d.%09d", sign, secs, nsecs), "0")
|
||||
}
|
||||
|
||||
// parsePAXRecord parses the input PAX record string into a key-value pair.
|
||||
// If parsing is successful, it will slice off the currently read record and
|
||||
// return the remainder as r.
|
||||
func parsePAXRecord(s string) (k, v, r string, err error) {
|
||||
// The size field ends at the first space.
|
||||
sp := strings.IndexByte(s, ' ')
|
||||
if sp == -1 {
|
||||
return "", "", s, ErrHeader
|
||||
}
|
||||
|
||||
// Parse the first token as a decimal integer.
|
||||
n, perr := strconv.ParseInt(s[:sp], 10, 0) // Intentionally parse as native int
|
||||
if perr != nil || n < 5 || int64(len(s)) < n {
|
||||
return "", "", s, ErrHeader
|
||||
}
|
||||
|
||||
// Extract everything between the space and the final newline.
|
||||
rec, nl, rem := s[sp+1:n-1], s[n-1:n], s[n:]
|
||||
if nl != "\n" {
|
||||
return "", "", s, ErrHeader
|
||||
}
|
||||
|
||||
// The first equals separates the key from the value.
|
||||
eq := strings.IndexByte(rec, '=')
|
||||
if eq == -1 {
|
||||
return "", "", s, ErrHeader
|
||||
}
|
||||
k, v = rec[:eq], rec[eq+1:]
|
||||
|
||||
if !validPAXRecord(k, v) {
|
||||
return "", "", s, ErrHeader
|
||||
}
|
||||
return k, v, rem, nil
|
||||
}
|
||||
|
||||
// formatPAXRecord formats a single PAX record, prefixing it with the
|
||||
// appropriate length.
|
||||
func formatPAXRecord(k, v string) (string, error) {
|
||||
if !validPAXRecord(k, v) {
|
||||
return "", ErrHeader
|
||||
}
|
||||
|
||||
const padding = 3 // Extra padding for ' ', '=', and '\n'
|
||||
size := len(k) + len(v) + padding
|
||||
size += len(strconv.Itoa(size))
|
||||
record := strconv.Itoa(size) + " " + k + "=" + v + "\n"
|
||||
|
||||
// Final adjustment if adding size field increased the record size.
|
||||
if len(record) != size {
|
||||
size = len(record)
|
||||
record = strconv.Itoa(size) + " " + k + "=" + v + "\n"
|
||||
}
|
||||
return record, nil
|
||||
}
|
||||
|
||||
// validPAXRecord reports whether the key-value pair is valid where each
|
||||
// record is formatted as:
|
||||
// "%d %s=%s\n" % (size, key, value)
|
||||
//
|
||||
// Keys and values should be UTF-8, but the number of bad writers out there
|
||||
// forces us to be a more liberal.
|
||||
// Thus, we only reject all keys with NUL, and only reject NULs in values
|
||||
// for the PAX version of the USTAR string fields.
|
||||
// The key must not contain an '=' character.
|
||||
func validPAXRecord(k, v string) bool {
|
||||
if k == "" || strings.IndexByte(k, '=') >= 0 {
|
||||
return false
|
||||
}
|
||||
switch k {
|
||||
case paxPath, paxLinkpath, paxUname, paxGname:
|
||||
return !hasNUL(v)
|
||||
default:
|
||||
return !hasNUL(k)
|
||||
}
|
||||
}
|
||||
644
vendor/archive/tar/writer.go
vendored
Normal file
644
vendor/archive/tar/writer.go
vendored
Normal file
|
|
@ -0,0 +1,644 @@
|
|||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package tar
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"io"
|
||||
"path"
|
||||
"sort"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
// Writer provides sequential writing of a tar archive.
|
||||
// Write.WriteHeader begins a new file with the provided Header,
|
||||
// and then Writer can be treated as an io.Writer to supply that file's data.
|
||||
type Writer struct {
|
||||
w io.Writer
|
||||
pad int64 // Amount of padding to write after current file entry
|
||||
curr fileWriter // Writer for current file entry
|
||||
hdr Header // Shallow copy of Header that is safe for mutations
|
||||
blk block // Buffer to use as temporary local storage
|
||||
|
||||
// err is a persistent error.
|
||||
// It is only the responsibility of every exported method of Writer to
|
||||
// ensure that this error is sticky.
|
||||
err error
|
||||
}
|
||||
|
||||
// NewWriter creates a new Writer writing to w.
|
||||
func NewWriter(w io.Writer) *Writer {
|
||||
return &Writer{w: w, curr: ®FileWriter{w, 0}}
|
||||
}
|
||||
|
||||
type fileWriter interface {
|
||||
io.Writer
|
||||
fileState
|
||||
|
||||
ReadFrom(io.Reader) (int64, error)
|
||||
}
|
||||
|
||||
// Flush finishes writing the current file's block padding.
|
||||
// The current file must be fully written before Flush can be called.
|
||||
//
|
||||
// This is unnecessary as the next call to WriteHeader or Close
|
||||
// will implicitly flush out the file's padding.
|
||||
func (tw *Writer) Flush() error {
|
||||
if tw.err != nil {
|
||||
return tw.err
|
||||
}
|
||||
if nb := tw.curr.LogicalRemaining(); nb > 0 {
|
||||
return fmt.Errorf("archive/tar: missed writing %d bytes", nb)
|
||||
}
|
||||
if _, tw.err = tw.w.Write(zeroBlock[:tw.pad]); tw.err != nil {
|
||||
return tw.err
|
||||
}
|
||||
tw.pad = 0
|
||||
return nil
|
||||
}
|
||||
|
||||
// WriteHeader writes hdr and prepares to accept the file's contents.
|
||||
// The Header.Size determines how many bytes can be written for the next file.
|
||||
// If the current file is not fully written, then this returns an error.
|
||||
// This implicitly flushes any padding necessary before writing the header.
|
||||
func (tw *Writer) WriteHeader(hdr *Header) error {
|
||||
if err := tw.Flush(); err != nil {
|
||||
return err
|
||||
}
|
||||
tw.hdr = *hdr // Shallow copy of Header
|
||||
|
||||
// Round ModTime and ignore AccessTime and ChangeTime unless
|
||||
// the format is explicitly chosen.
|
||||
// This ensures nominal usage of WriteHeader (without specifying the format)
|
||||
// does not always result in the PAX format being chosen, which
|
||||
// causes a 1KiB increase to every header.
|
||||
if tw.hdr.Format == FormatUnknown {
|
||||
tw.hdr.ModTime = tw.hdr.ModTime.Round(time.Second)
|
||||
tw.hdr.AccessTime = time.Time{}
|
||||
tw.hdr.ChangeTime = time.Time{}
|
||||
}
|
||||
|
||||
allowedFormats, paxHdrs, err := tw.hdr.allowedFormats()
|
||||
switch {
|
||||
case allowedFormats.has(FormatUSTAR):
|
||||
tw.err = tw.writeUSTARHeader(&tw.hdr)
|
||||
return tw.err
|
||||
case allowedFormats.has(FormatPAX):
|
||||
tw.err = tw.writePAXHeader(&tw.hdr, paxHdrs)
|
||||
return tw.err
|
||||
case allowedFormats.has(FormatGNU):
|
||||
tw.err = tw.writeGNUHeader(&tw.hdr)
|
||||
return tw.err
|
||||
default:
|
||||
return err // Non-fatal error
|
||||
}
|
||||
}
|
||||
|
||||
func (tw *Writer) writeUSTARHeader(hdr *Header) error {
|
||||
// Check if we can use USTAR prefix/suffix splitting.
|
||||
var namePrefix string
|
||||
if prefix, suffix, ok := splitUSTARPath(hdr.Name); ok {
|
||||
namePrefix, hdr.Name = prefix, suffix
|
||||
}
|
||||
|
||||
// Pack the main header.
|
||||
var f formatter
|
||||
blk := tw.templateV7Plus(hdr, f.formatString, f.formatOctal)
|
||||
f.formatString(blk.USTAR().Prefix(), namePrefix)
|
||||
blk.SetFormat(FormatUSTAR)
|
||||
if f.err != nil {
|
||||
return f.err // Should never happen since header is validated
|
||||
}
|
||||
return tw.writeRawHeader(blk, hdr.Size, hdr.Typeflag)
|
||||
}
|
||||
|
||||
func (tw *Writer) writePAXHeader(hdr *Header, paxHdrs map[string]string) error {
|
||||
realName, realSize := hdr.Name, hdr.Size
|
||||
|
||||
// TODO(dsnet): Re-enable this when adding sparse support.
|
||||
// See https://golang.org/issue/22735
|
||||
/*
|
||||
// Handle sparse files.
|
||||
var spd sparseDatas
|
||||
var spb []byte
|
||||
if len(hdr.SparseHoles) > 0 {
|
||||
sph := append([]sparseEntry{}, hdr.SparseHoles...) // Copy sparse map
|
||||
sph = alignSparseEntries(sph, hdr.Size)
|
||||
spd = invertSparseEntries(sph, hdr.Size)
|
||||
|
||||
// Format the sparse map.
|
||||
hdr.Size = 0 // Replace with encoded size
|
||||
spb = append(strconv.AppendInt(spb, int64(len(spd)), 10), '\n')
|
||||
for _, s := range spd {
|
||||
hdr.Size += s.Length
|
||||
spb = append(strconv.AppendInt(spb, s.Offset, 10), '\n')
|
||||
spb = append(strconv.AppendInt(spb, s.Length, 10), '\n')
|
||||
}
|
||||
pad := blockPadding(int64(len(spb)))
|
||||
spb = append(spb, zeroBlock[:pad]...)
|
||||
hdr.Size += int64(len(spb)) // Accounts for encoded sparse map
|
||||
|
||||
// Add and modify appropriate PAX records.
|
||||
dir, file := path.Split(realName)
|
||||
hdr.Name = path.Join(dir, "GNUSparseFile.0", file)
|
||||
paxHdrs[paxGNUSparseMajor] = "1"
|
||||
paxHdrs[paxGNUSparseMinor] = "0"
|
||||
paxHdrs[paxGNUSparseName] = realName
|
||||
paxHdrs[paxGNUSparseRealSize] = strconv.FormatInt(realSize, 10)
|
||||
paxHdrs[paxSize] = strconv.FormatInt(hdr.Size, 10)
|
||||
delete(paxHdrs, paxPath) // Recorded by paxGNUSparseName
|
||||
}
|
||||
*/
|
||||
_ = realSize
|
||||
|
||||
// Write PAX records to the output.
|
||||
isGlobal := hdr.Typeflag == TypeXGlobalHeader
|
||||
if len(paxHdrs) > 0 || isGlobal {
|
||||
// Sort keys for deterministic ordering.
|
||||
var keys []string
|
||||
for k := range paxHdrs {
|
||||
keys = append(keys, k)
|
||||
}
|
||||
sort.Strings(keys)
|
||||
|
||||
// Write each record to a buffer.
|
||||
var buf bytes.Buffer
|
||||
for _, k := range keys {
|
||||
rec, err := formatPAXRecord(k, paxHdrs[k])
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
buf.WriteString(rec)
|
||||
}
|
||||
|
||||
// Write the extended header file.
|
||||
var name string
|
||||
var flag byte
|
||||
if isGlobal {
|
||||
name = realName
|
||||
if name == "" {
|
||||
name = "GlobalHead.0.0"
|
||||
}
|
||||
flag = TypeXGlobalHeader
|
||||
} else {
|
||||
dir, file := path.Split(realName)
|
||||
name = path.Join(dir, "PaxHeaders.0", file)
|
||||
flag = TypeXHeader
|
||||
}
|
||||
data := buf.String()
|
||||
if err := tw.writeRawFile(name, data, flag, FormatPAX); err != nil || isGlobal {
|
||||
return err // Global headers return here
|
||||
}
|
||||
}
|
||||
|
||||
// Pack the main header.
|
||||
var f formatter // Ignore errors since they are expected
|
||||
fmtStr := func(b []byte, s string) { f.formatString(b, toASCII(s)) }
|
||||
blk := tw.templateV7Plus(hdr, fmtStr, f.formatOctal)
|
||||
blk.SetFormat(FormatPAX)
|
||||
if err := tw.writeRawHeader(blk, hdr.Size, hdr.Typeflag); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// TODO(dsnet): Re-enable this when adding sparse support.
|
||||
// See https://golang.org/issue/22735
|
||||
/*
|
||||
// Write the sparse map and setup the sparse writer if necessary.
|
||||
if len(spd) > 0 {
|
||||
// Use tw.curr since the sparse map is accounted for in hdr.Size.
|
||||
if _, err := tw.curr.Write(spb); err != nil {
|
||||
return err
|
||||
}
|
||||
tw.curr = &sparseFileWriter{tw.curr, spd, 0}
|
||||
}
|
||||
*/
|
||||
return nil
|
||||
}
|
||||
|
||||
func (tw *Writer) writeGNUHeader(hdr *Header) error {
|
||||
// Use long-link files if Name or Linkname exceeds the field size.
|
||||
const longName = "././@LongLink"
|
||||
if len(hdr.Name) > nameSize {
|
||||
data := hdr.Name + "\x00"
|
||||
if err := tw.writeRawFile(longName, data, TypeGNULongName, FormatGNU); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
if len(hdr.Linkname) > nameSize {
|
||||
data := hdr.Linkname + "\x00"
|
||||
if err := tw.writeRawFile(longName, data, TypeGNULongLink, FormatGNU); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
// Pack the main header.
|
||||
var f formatter // Ignore errors since they are expected
|
||||
var spd sparseDatas
|
||||
var spb []byte
|
||||
blk := tw.templateV7Plus(hdr, f.formatString, f.formatNumeric)
|
||||
if !hdr.AccessTime.IsZero() {
|
||||
f.formatNumeric(blk.GNU().AccessTime(), hdr.AccessTime.Unix())
|
||||
}
|
||||
if !hdr.ChangeTime.IsZero() {
|
||||
f.formatNumeric(blk.GNU().ChangeTime(), hdr.ChangeTime.Unix())
|
||||
}
|
||||
// TODO(dsnet): Re-enable this when adding sparse support.
|
||||
// See https://golang.org/issue/22735
|
||||
/*
|
||||
if hdr.Typeflag == TypeGNUSparse {
|
||||
sph := append([]sparseEntry{}, hdr.SparseHoles...) // Copy sparse map
|
||||
sph = alignSparseEntries(sph, hdr.Size)
|
||||
spd = invertSparseEntries(sph, hdr.Size)
|
||||
|
||||
// Format the sparse map.
|
||||
formatSPD := func(sp sparseDatas, sa sparseArray) sparseDatas {
|
||||
for i := 0; len(sp) > 0 && i < sa.MaxEntries(); i++ {
|
||||
f.formatNumeric(sa.Entry(i).Offset(), sp[0].Offset)
|
||||
f.formatNumeric(sa.Entry(i).Length(), sp[0].Length)
|
||||
sp = sp[1:]
|
||||
}
|
||||
if len(sp) > 0 {
|
||||
sa.IsExtended()[0] = 1
|
||||
}
|
||||
return sp
|
||||
}
|
||||
sp2 := formatSPD(spd, blk.GNU().Sparse())
|
||||
for len(sp2) > 0 {
|
||||
var spHdr block
|
||||
sp2 = formatSPD(sp2, spHdr.Sparse())
|
||||
spb = append(spb, spHdr[:]...)
|
||||
}
|
||||
|
||||
// Update size fields in the header block.
|
||||
realSize := hdr.Size
|
||||
hdr.Size = 0 // Encoded size; does not account for encoded sparse map
|
||||
for _, s := range spd {
|
||||
hdr.Size += s.Length
|
||||
}
|
||||
copy(blk.V7().Size(), zeroBlock[:]) // Reset field
|
||||
f.formatNumeric(blk.V7().Size(), hdr.Size)
|
||||
f.formatNumeric(blk.GNU().RealSize(), realSize)
|
||||
}
|
||||
*/
|
||||
blk.SetFormat(FormatGNU)
|
||||
if err := tw.writeRawHeader(blk, hdr.Size, hdr.Typeflag); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Write the extended sparse map and setup the sparse writer if necessary.
|
||||
if len(spd) > 0 {
|
||||
// Use tw.w since the sparse map is not accounted for in hdr.Size.
|
||||
if _, err := tw.w.Write(spb); err != nil {
|
||||
return err
|
||||
}
|
||||
tw.curr = &sparseFileWriter{tw.curr, spd, 0}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
type (
|
||||
stringFormatter func([]byte, string)
|
||||
numberFormatter func([]byte, int64)
|
||||
)
|
||||
|
||||
// templateV7Plus fills out the V7 fields of a block using values from hdr.
|
||||
// It also fills out fields (uname, gname, devmajor, devminor) that are
|
||||
// shared in the USTAR, PAX, and GNU formats using the provided formatters.
|
||||
//
|
||||
// The block returned is only valid until the next call to
|
||||
// templateV7Plus or writeRawFile.
|
||||
func (tw *Writer) templateV7Plus(hdr *Header, fmtStr stringFormatter, fmtNum numberFormatter) *block {
|
||||
tw.blk.Reset()
|
||||
|
||||
modTime := hdr.ModTime
|
||||
if modTime.IsZero() {
|
||||
modTime = time.Unix(0, 0)
|
||||
}
|
||||
|
||||
v7 := tw.blk.V7()
|
||||
v7.TypeFlag()[0] = hdr.Typeflag
|
||||
fmtStr(v7.Name(), hdr.Name)
|
||||
fmtStr(v7.LinkName(), hdr.Linkname)
|
||||
fmtNum(v7.Mode(), hdr.Mode)
|
||||
fmtNum(v7.UID(), int64(hdr.Uid))
|
||||
fmtNum(v7.GID(), int64(hdr.Gid))
|
||||
fmtNum(v7.Size(), hdr.Size)
|
||||
fmtNum(v7.ModTime(), modTime.Unix())
|
||||
|
||||
ustar := tw.blk.USTAR()
|
||||
fmtStr(ustar.UserName(), hdr.Uname)
|
||||
fmtStr(ustar.GroupName(), hdr.Gname)
|
||||
fmtNum(ustar.DevMajor(), hdr.Devmajor)
|
||||
fmtNum(ustar.DevMinor(), hdr.Devminor)
|
||||
|
||||
return &tw.blk
|
||||
}
|
||||
|
||||
// writeRawFile writes a minimal file with the given name and flag type.
|
||||
// It uses format to encode the header format and will write data as the body.
|
||||
// It uses default values for all of the other fields (as BSD and GNU tar does).
|
||||
func (tw *Writer) writeRawFile(name, data string, flag byte, format Format) error {
|
||||
tw.blk.Reset()
|
||||
|
||||
// Best effort for the filename.
|
||||
name = toASCII(name)
|
||||
if len(name) > nameSize {
|
||||
name = name[:nameSize]
|
||||
}
|
||||
name = strings.TrimRight(name, "/")
|
||||
|
||||
var f formatter
|
||||
v7 := tw.blk.V7()
|
||||
v7.TypeFlag()[0] = flag
|
||||
f.formatString(v7.Name(), name)
|
||||
f.formatOctal(v7.Mode(), 0)
|
||||
f.formatOctal(v7.UID(), 0)
|
||||
f.formatOctal(v7.GID(), 0)
|
||||
f.formatOctal(v7.Size(), int64(len(data))) // Must be < 8GiB
|
||||
f.formatOctal(v7.ModTime(), 0)
|
||||
tw.blk.SetFormat(format)
|
||||
if f.err != nil {
|
||||
return f.err // Only occurs if size condition is violated
|
||||
}
|
||||
|
||||
// Write the header and data.
|
||||
if err := tw.writeRawHeader(&tw.blk, int64(len(data)), flag); err != nil {
|
||||
return err
|
||||
}
|
||||
_, err := io.WriteString(tw, data)
|
||||
return err
|
||||
}
|
||||
|
||||
// writeRawHeader writes the value of blk, regardless of its value.
|
||||
// It sets up the Writer such that it can accept a file of the given size.
|
||||
// If the flag is a special header-only flag, then the size is treated as zero.
|
||||
func (tw *Writer) writeRawHeader(blk *block, size int64, flag byte) error {
|
||||
if err := tw.Flush(); err != nil {
|
||||
return err
|
||||
}
|
||||
if _, err := tw.w.Write(blk[:]); err != nil {
|
||||
return err
|
||||
}
|
||||
if isHeaderOnlyType(flag) {
|
||||
size = 0
|
||||
}
|
||||
tw.curr = ®FileWriter{tw.w, size}
|
||||
tw.pad = blockPadding(size)
|
||||
return nil
|
||||
}
|
||||
|
||||
// splitUSTARPath splits a path according to USTAR prefix and suffix rules.
|
||||
// If the path is not splittable, then it will return ("", "", false).
|
||||
func splitUSTARPath(name string) (prefix, suffix string, ok bool) {
|
||||
length := len(name)
|
||||
if length <= nameSize || !isASCII(name) {
|
||||
return "", "", false
|
||||
} else if length > prefixSize+1 {
|
||||
length = prefixSize + 1
|
||||
} else if name[length-1] == '/' {
|
||||
length--
|
||||
}
|
||||
|
||||
i := strings.LastIndex(name[:length], "/")
|
||||
nlen := len(name) - i - 1 // nlen is length of suffix
|
||||
plen := i // plen is length of prefix
|
||||
if i <= 0 || nlen > nameSize || nlen == 0 || plen > prefixSize {
|
||||
return "", "", false
|
||||
}
|
||||
return name[:i], name[i+1:], true
|
||||
}
|
||||
|
||||
// Write writes to the current file in the tar archive.
|
||||
// Write returns the error ErrWriteTooLong if more than
|
||||
// Header.Size bytes are written after WriteHeader.
|
||||
//
|
||||
// Calling Write on special types like TypeLink, TypeSymlink, TypeChar,
|
||||
// TypeBlock, TypeDir, and TypeFifo returns (0, ErrWriteTooLong) regardless
|
||||
// of what the Header.Size claims.
|
||||
func (tw *Writer) Write(b []byte) (int, error) {
|
||||
if tw.err != nil {
|
||||
return 0, tw.err
|
||||
}
|
||||
n, err := tw.curr.Write(b)
|
||||
if err != nil && err != ErrWriteTooLong {
|
||||
tw.err = err
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
// readFrom populates the content of the current file by reading from r.
|
||||
// The bytes read must match the number of remaining bytes in the current file.
|
||||
//
|
||||
// If the current file is sparse and r is an io.ReadSeeker,
|
||||
// then readFrom uses Seek to skip past holes defined in Header.SparseHoles,
|
||||
// assuming that skipped regions are all NULs.
|
||||
// This always reads the last byte to ensure r is the right size.
|
||||
//
|
||||
// TODO(dsnet): Re-export this when adding sparse file support.
|
||||
// See https://golang.org/issue/22735
|
||||
func (tw *Writer) readFrom(r io.Reader) (int64, error) {
|
||||
if tw.err != nil {
|
||||
return 0, tw.err
|
||||
}
|
||||
n, err := tw.curr.ReadFrom(r)
|
||||
if err != nil && err != ErrWriteTooLong {
|
||||
tw.err = err
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
// Close closes the tar archive by flushing the padding, and writing the footer.
|
||||
// If the current file (from a prior call to WriteHeader) is not fully written,
|
||||
// then this returns an error.
|
||||
func (tw *Writer) Close() error {
|
||||
if tw.err == ErrWriteAfterClose {
|
||||
return nil
|
||||
}
|
||||
if tw.err != nil {
|
||||
return tw.err
|
||||
}
|
||||
|
||||
// Trailer: two zero blocks.
|
||||
err := tw.Flush()
|
||||
for i := 0; i < 2 && err == nil; i++ {
|
||||
_, err = tw.w.Write(zeroBlock[:])
|
||||
}
|
||||
|
||||
// Ensure all future actions are invalid.
|
||||
tw.err = ErrWriteAfterClose
|
||||
return err // Report IO errors
|
||||
}
|
||||
|
||||
// regFileWriter is a fileWriter for writing data to a regular file entry.
|
||||
type regFileWriter struct {
|
||||
w io.Writer // Underlying Writer
|
||||
nb int64 // Number of remaining bytes to write
|
||||
}
|
||||
|
||||
func (fw *regFileWriter) Write(b []byte) (n int, err error) {
|
||||
overwrite := int64(len(b)) > fw.nb
|
||||
if overwrite {
|
||||
b = b[:fw.nb]
|
||||
}
|
||||
if len(b) > 0 {
|
||||
n, err = fw.w.Write(b)
|
||||
fw.nb -= int64(n)
|
||||
}
|
||||
switch {
|
||||
case err != nil:
|
||||
return n, err
|
||||
case overwrite:
|
||||
return n, ErrWriteTooLong
|
||||
default:
|
||||
return n, nil
|
||||
}
|
||||
}
|
||||
|
||||
func (fw *regFileWriter) ReadFrom(r io.Reader) (int64, error) {
|
||||
return io.Copy(struct{ io.Writer }{fw}, r)
|
||||
}
|
||||
|
||||
func (fw regFileWriter) LogicalRemaining() int64 {
|
||||
return fw.nb
|
||||
}
|
||||
func (fw regFileWriter) PhysicalRemaining() int64 {
|
||||
return fw.nb
|
||||
}
|
||||
|
||||
// sparseFileWriter is a fileWriter for writing data to a sparse file entry.
|
||||
type sparseFileWriter struct {
|
||||
fw fileWriter // Underlying fileWriter
|
||||
sp sparseDatas // Normalized list of data fragments
|
||||
pos int64 // Current position in sparse file
|
||||
}
|
||||
|
||||
func (sw *sparseFileWriter) Write(b []byte) (n int, err error) {
|
||||
overwrite := int64(len(b)) > sw.LogicalRemaining()
|
||||
if overwrite {
|
||||
b = b[:sw.LogicalRemaining()]
|
||||
}
|
||||
|
||||
b0 := b
|
||||
endPos := sw.pos + int64(len(b))
|
||||
for endPos > sw.pos && err == nil {
|
||||
var nf int // Bytes written in fragment
|
||||
dataStart, dataEnd := sw.sp[0].Offset, sw.sp[0].endOffset()
|
||||
if sw.pos < dataStart { // In a hole fragment
|
||||
bf := b[:min(int64(len(b)), dataStart-sw.pos)]
|
||||
nf, err = zeroWriter{}.Write(bf)
|
||||
} else { // In a data fragment
|
||||
bf := b[:min(int64(len(b)), dataEnd-sw.pos)]
|
||||
nf, err = sw.fw.Write(bf)
|
||||
}
|
||||
b = b[nf:]
|
||||
sw.pos += int64(nf)
|
||||
if sw.pos >= dataEnd && len(sw.sp) > 1 {
|
||||
sw.sp = sw.sp[1:] // Ensure last fragment always remains
|
||||
}
|
||||
}
|
||||
|
||||
n = len(b0) - len(b)
|
||||
switch {
|
||||
case err == ErrWriteTooLong:
|
||||
return n, errMissData // Not possible; implies bug in validation logic
|
||||
case err != nil:
|
||||
return n, err
|
||||
case sw.LogicalRemaining() == 0 && sw.PhysicalRemaining() > 0:
|
||||
return n, errUnrefData // Not possible; implies bug in validation logic
|
||||
case overwrite:
|
||||
return n, ErrWriteTooLong
|
||||
default:
|
||||
return n, nil
|
||||
}
|
||||
}
|
||||
|
||||
func (sw *sparseFileWriter) ReadFrom(r io.Reader) (n int64, err error) {
|
||||
rs, ok := r.(io.ReadSeeker)
|
||||
if ok {
|
||||
if _, err := rs.Seek(0, io.SeekCurrent); err != nil {
|
||||
ok = false // Not all io.Seeker can really seek
|
||||
}
|
||||
}
|
||||
if !ok {
|
||||
return io.Copy(struct{ io.Writer }{sw}, r)
|
||||
}
|
||||
|
||||
var readLastByte bool
|
||||
pos0 := sw.pos
|
||||
for sw.LogicalRemaining() > 0 && !readLastByte && err == nil {
|
||||
var nf int64 // Size of fragment
|
||||
dataStart, dataEnd := sw.sp[0].Offset, sw.sp[0].endOffset()
|
||||
if sw.pos < dataStart { // In a hole fragment
|
||||
nf = dataStart - sw.pos
|
||||
if sw.PhysicalRemaining() == 0 {
|
||||
readLastByte = true
|
||||
nf--
|
||||
}
|
||||
_, err = rs.Seek(nf, io.SeekCurrent)
|
||||
} else { // In a data fragment
|
||||
nf = dataEnd - sw.pos
|
||||
nf, err = io.CopyN(sw.fw, rs, nf)
|
||||
}
|
||||
sw.pos += nf
|
||||
if sw.pos >= dataEnd && len(sw.sp) > 1 {
|
||||
sw.sp = sw.sp[1:] // Ensure last fragment always remains
|
||||
}
|
||||
}
|
||||
|
||||
// If the last fragment is a hole, then seek to 1-byte before EOF, and
|
||||
// read a single byte to ensure the file is the right size.
|
||||
if readLastByte && err == nil {
|
||||
_, err = mustReadFull(rs, []byte{0})
|
||||
sw.pos++
|
||||
}
|
||||
|
||||
n = sw.pos - pos0
|
||||
switch {
|
||||
case err == io.EOF:
|
||||
return n, io.ErrUnexpectedEOF
|
||||
case err == ErrWriteTooLong:
|
||||
return n, errMissData // Not possible; implies bug in validation logic
|
||||
case err != nil:
|
||||
return n, err
|
||||
case sw.LogicalRemaining() == 0 && sw.PhysicalRemaining() > 0:
|
||||
return n, errUnrefData // Not possible; implies bug in validation logic
|
||||
default:
|
||||
return n, ensureEOF(rs)
|
||||
}
|
||||
}
|
||||
|
||||
func (sw sparseFileWriter) LogicalRemaining() int64 {
|
||||
return sw.sp[len(sw.sp)-1].endOffset() - sw.pos
|
||||
}
|
||||
func (sw sparseFileWriter) PhysicalRemaining() int64 {
|
||||
return sw.fw.PhysicalRemaining()
|
||||
}
|
||||
|
||||
// zeroWriter may only be written with NULs, otherwise it returns errWriteHole.
|
||||
type zeroWriter struct{}
|
||||
|
||||
func (zeroWriter) Write(b []byte) (int, error) {
|
||||
for i, c := range b {
|
||||
if c != 0 {
|
||||
return i, errWriteHole
|
||||
}
|
||||
}
|
||||
return len(b), nil
|
||||
}
|
||||
|
||||
// ensureEOF checks whether r is at EOF, reporting ErrWriteTooLong if not so.
|
||||
func ensureEOF(r io.Reader) error {
|
||||
n, err := tryReadFull(r, []byte{0})
|
||||
switch {
|
||||
case n > 0:
|
||||
return ErrWriteTooLong
|
||||
case err == io.EOF:
|
||||
return nil
|
||||
default:
|
||||
return err
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue