45 lines
1 KiB
Go
45 lines
1 KiB
Go
package remotecontext // import "github.com/docker/docker/builder/remotecontext"
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import (
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"archive/tar"
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"crypto/sha256"
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"hash"
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"os"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/tarsum"
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)
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// NewFileHash returns new hash that is used for the builder cache keys
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func NewFileHash(path, name string, fi os.FileInfo) (hash.Hash, error) {
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var link string
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if fi.Mode()&os.ModeSymlink != 0 {
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var err error
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link, err = os.Readlink(path)
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if err != nil {
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return nil, err
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}
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}
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hdr, err := archive.FileInfoHeader(name, fi, link)
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if err != nil {
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return nil, err
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}
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if err := archive.ReadSecurityXattrToTarHeader(path, hdr); err != nil {
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return nil, err
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}
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tsh := &tarsumHash{hdr: hdr, Hash: sha256.New()}
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tsh.Reset() // initialize header
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return tsh, nil
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}
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type tarsumHash struct {
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hash.Hash
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hdr *tar.Header
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}
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// Reset resets the Hash to its initial state.
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func (tsh *tarsumHash) Reset() {
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// comply with hash.Hash and reset to the state hash had before any writes
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tsh.Hash.Reset()
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tarsum.WriteV1Header(tsh.hdr, tsh.Hash)
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}
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