The implementation in libcontainer/system is quite complicated,
and we only use it to detect if user-namespaces are enabled.
In addition, the implementation in containerd uses a sync.Once,
so that detection (and reading/parsing `/proc/self/uid_map`) is
only performed once.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
The implementation in libcontainer/system is quite complicated,
and we only use it to detect if user-namespaces are enabled.
In addition, the implementation in containerd uses a sync.Once,
so that detection (and reading/parsing `/proc/self/uid_map`) is
only performed once.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
NewIdentityMapping took group name as an argument, and used
the group name also to parse the /etc/sub{uid,gui}. But as per
linux man pages, the sub{uid,gid} file maps username or uid,
not a group name.
Therefore, all occurrences where mapping is used need to
consider only username and uid. Code trying to map using gid
and group name in the daemon is also removed.
Signed-off-by: Akhil Mohan <akhil.mohan@mayadata.io>
compile error the "stat.Rdev" variable and "s.Rdev" mismatched types on mips64el
convert "stat.Rdev" type to uint64 explicitly
Signed-off-by: Xiaodong Liu <liuxiaodong@loongson.cn>
For some reason, commit 69cf03700f chose not to use information
already fetched, and called cgroups.FindCgroupMountpoint() instead.
This is not a cheap call, as it has to parse the whole nine yards
of /proc/self/mountinfo, and the info which it tries to get (whether
the pids controller is present) is already available from cgMounts map.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
`func init()` is evil here, and the logrus calls are being made before
the logger is even setup.
It also means in order to use pigz you have to restart the daemon.
Instead this takes a small hit and resolves pigz on each extraction.
In the grand scheme of decompressing this is a very small hit.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
On macOS, unit tests were failing with
root@c4101a75c792:/go/src/github.com/docker/docker/pkg/authorization# go test .
--- FAIL: TestAuthZRequestPluginError (0.00s)
authz_unix_test.go:295: listen unix authz-test-plugin.sock: bind: file name too long
--- FAIL: TestAuthZRequestPlugin (0.00s)
authz_unix_test.go:295: listen unix authz-test-plugin.sock: bind: file name too long
--- FAIL: TestAuthZResponsePlugin (0.00s)
authz_unix_test.go:295: listen unix authz-test-plugin.sock: bind: file name too long
time="2020-04-07T10:07:04Z" level=warning msg="Request body is larger than: '1048576' skipping body"
--- FAIL: TestMiddlewareWrapHandler (0.00s)
authz_unix_test.go:295: listen unix authz-test-plugin.sock: bind: file name too long
FAIL
FAIL github.com/docker/docker/pkg/authorization 0.120s
This change moves the socket creation from a working test directory to a tmp directory,
so the path is shorter.
Change-type: patch
Signed-off-by: Roman Mazur <roman@balena.io>
We do our CI via golangci-lint, which understands nolint: annotations.
A standalone linter tool, golint, does not, and it insists on
documenting these:
> pkg/mount/deprecated.go:47:1: comment on exported var MergeTmpfsOptions should be of the form "MergeTmpfsOptions ..."
> pkg/mount/deprecated.go:51:1: comment on exported type FilterFunc should be of the form "FilterFunc ..." (with optional leading article)
> pkg/mount/deprecated.go:51:1: comment on exported type Info should be of the form "Info ..." (with optional leading article)
For `MergeTmpfsOptions`, the workaround is to put it inside a
`var ( ... )` block.
For the other two warnings, we have to provide the "actual"
documentation (or something that looks like it).
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Add a deprecation/removal notice, pointing out to appropriate
replacement packages.
I was not sure if a package-level deprecation is enough, so
I also added notices around each block.
Note that `nolint:golint` annotations are left as is, otherwise
golint complains like this:
> pkg/mount/deprecated.go:45:1: comment on exported var `MergeTmpfsOptions` should be of the form `MergeTmpfsOptions ...` (golint)
> // Deprecated: use github.com/moby/sys/mount instead.
> ^
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Switch to moby/sys/mount and mountinfo. Keep the pkg/mount for potential
outside users.
This commit was generated by the following bash script:
```
set -e -u -o pipefail
for file in $(git grep -l 'docker/docker/pkg/mount"' | grep -v ^pkg/mount); do
sed -i -e 's#/docker/docker/pkg/mount"#/moby/sys/mount"#' \
-e 's#mount\.\(GetMounts\|Mounted\|Info\|[A-Za-z]*Filter\)#mountinfo.\1#g' \
$file
goimports -w $file
done
```
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Make pkg/mount a shallow package, relying on
github.com/moby/sys/mount and github.com/moby/sys/mountinfo
The plan is to
- switch the rest of this repo to use moby/sys directly
- add deprecation notice to pkg/mount
- (eventually) remove pkg/mount
The nolint:golint annotation is added to suppress warnings like
"exported XXX should have comment or be unexported".
The ForceMount function is deprecated (and is identical to Mount),
so let's not use it (but still provide an alias for those who do).
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Currently, the escapeProxy works under the assumption that the
underlying reader will always return 1 byte at a time. Even though this
is usually true, it is not always the case, for example when using a pty
and writing multiple bytes to the master before flushing it.
In such cases the proxy reader doesn't work properly. For example with
an escape sequence being `ctrl-p,ctrl-q`, when the underlying reader
returns `ctrl-p,ctrl-q` at once, the escape sequence isn't detected.
This updates the reader to support this use-case and adds unit tests.
Signed-off-by: Bilal Amarni <bilal.amarni@gmail.com>
error log :
signal_test.go:20: assertion failed: error is not nil: Invalid signal: SIGEMT
signal_test.go:22: assertion failed:
When "ParseSignal" function parse sigStr from SignalMap, it find the signal object with key ("SIG"+sigStr). But EMT signal named "SIGEMT" in SignalMap structrue, so the real key is "SIGSIGEMT" , and cannot find the target signal.
modify "SIGEMT" to "EMT" in SignalMap structrue.
Signed-off-by: liuxiaodong <liuxiaodong@loongson.cn>
We recently updated golangci-lint, which is checking for some
additional linting rules, causing a failure in code that was
just merged to master; 5bd02b8a86
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
It makes sense to use mount package here because
- it no longer requires /proc to be mounted
- it provides verbose errors so the caller doesn't have to
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This was added in PR #6669 (commit f87afda123) because it was
otherwise impossible to do a re-mount of already mounted file system.
It is way better to just remove the Mounted() check altogether.
This change might potentially lead to multiple mounts to the same
mount point, so I audited all the users (except tests) and it looks
like no one is doing that:
* volume/local maintains 'mounted' flag for every volume
* pkg/chrootarchive already calls Mounted() before Mount()
(so it actually parsed /proc/self/mountinfo twice, oops!)
* daemon.mountVolumes() is called for docker cp only, and
it is called once
* daemon/graphdriver/zfs keeps track of 'mounted' status
* daemon/graphdriver/devmapper: ditto
* daemon.createSecretsDir() is only called once during container start
Surely I might have easily missed something so this needs a careful
review.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Calling mount.Mounted() after an error from Unmount() is
questionable -- if umount failed, the mount is probably
still there anyway, it doesn't make sense to check it.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
1. Call to mount.Mounted() is very expensive and it's redundant
to call it before Unmount().
2. Calling mount.Mounted() after an error from Unmount() is
questionable -- if umount failed, the mount is probably
still there anyway, it doesn't make sense to check it.
This should result in faster code with no change in functionality.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This function was added in 9c4570a958,
but appears to never have been used.
Removing it, as it's not used in the codebase and, from a quick
search on GitHub, also doesn't look to be used by other projects.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
follow-up to 069fdc8a08, replacing
more uses of the syscall package in favor of their "windows"
equivalents in golang.org/x/sys.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
lgetxattr(2) man page says:
> If size is specified as zero, these calls return the current size of
> the named extended attribute (and leave value unchanged). This can be
> used to determine the size of the buffer that should be supplied in a
> subsequent call. (But, bear in mind that there is a possibility that
> the attribute value may change between the two calls, so that it is
> still necessary to check the return status from the second call.)
The current code does not handle the case when the size changes between
the two calls, and the new size is larger.
Fix the above problem, and slightly simplify the code.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
enable resource limitation by disabling cgroup v1 warnings
resource limitation still doesn't work with rootless mode (even with systemd mode)
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
If `unix.Lgetxattr` returns an error, then `sz == -1` which will cause a
runtime panic if `errno == unix.ERANGE`.
Signed-off-by: Sascha Grunert <sgrunert@suse.com>
This clarifies comments about static linking made in commit a8608b5b67.
1. There are two ways to create a static binary, one is to disable
cgo, the other is to set linker flags. When cgo is disabled,
there is no need to use osusergo build tag.
2. osusergo only needs to be set when linking against glibc.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
TL;DR: there is no way to do this right.
We do know that in some combination of build tags set (or unset),
linker flags, environment variables, and libc implementation,
this package won't work right. In fact, there is one specific
combination:
1. `CGO_ENABLED=1` (or unset)
2. static binary is being built (e.g. `go build` is run with `-extldflags -static`)
3. `go build` links the binary against glibc
4. `osusergo` is not set
This particular combination results in the following legitimate linker warning:
> cgo_lookup_unix.go: warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
If this warning is ignored and the resulting binary is used on a system
with files from a different glibc version (or without those files), it
could result in a segfault.
The commit being reverted tried to guard against such possibility,
but the problem is, we can only use build tags to account for items
1 and 4 from the above list, while items 2 and 3 do not result in
any build tags being set or unset, making this guard excessive.
Remove it.
This reverts commit 023b072288.
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
```
pkg/mount/mountinfo_linux.go:93:5: SA4011: ineffective break statement. Did you mean to break out of the outer loop? (staticcheck)
break
^
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Also fixed some incorrectly formatted comments
```
pkg/jsonmessage/jsonmessage.go:180:20: SA1006: printf-style function with dynamic format string and no further arguments should use print-style function instead (staticcheck)
fmt.Fprintf(out, endl)
^
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This struct now has a properly typed member, so use the properly typed
functions with it.
Also update the vendor directory and hope nothing explodes.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This is to ensure that users of the homedir package cannot
compile statically (CGO_ENABLED=0) without also setting the osusergo
build tag.
Signed-off-by: Tibor Vass <tibor@docker.com>
About github.com/opencontainers/runc/libcontainer/user:
According to 195d8d544a
this package has two functions:
- Have a static implementation of user lookup, which is now supported in the
os/user stdlib package with the osusergo build tag, but wasn't at the time.
- Have extra functions that os/user doesn't have, but none of those are used
in homedir.
Since https://github.com/moby/moby/pull/11287, homedir depended directly on
libcontainer's user package for CurrentUser().
This is being replaced with os/user.Current(), because all of our static
binaries are compiled with the osusergo tag, and for dynamic libraries it
is more correct to use libc's implementation than parsing /etc/passwd.
About github.com/docker/docker/pkg/idtools:
Only dependency was from GetStatic() which uses idtools.LookupUID(uid).
The implementation of idtools.LookupUID just calls to
github.com/opencontainers/runc/libcontainer/user.LookupUid or fallbacks
to exec-ing to getent (since https://github.com/moby/moby/pull/27599).
This patch replaces calls to homedir.GetStatic by homedir.Get(), opting out
of supporting nss lookups in static binaries via exec-ing to getent for
the homedir package.
If homedir package users need to support nss lookups, they are advised
to compile dynamically instead.
Signed-off-by: Tibor Vass <tibor@docker.com>
