mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
34 lines
773 B
Go
34 lines
773 B
Go
package remotecontext
|
|
|
|
import (
|
|
"archive/tar"
|
|
"crypto/sha256"
|
|
"hash"
|
|
"os"
|
|
|
|
"github.com/docker/docker/pkg/archive"
|
|
"github.com/docker/docker/pkg/tarsum"
|
|
)
|
|
|
|
// NewFileHash returns new hash that is used for the builder cache keys
|
|
func NewFileHash(path, name string, fi os.FileInfo) (hash.Hash, error) {
|
|
hdr, err := archive.FileInfoHeader(path, name, fi)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
tsh := &tarsumHash{hdr: hdr, Hash: sha256.New()}
|
|
tsh.Reset() // initialize header
|
|
return tsh, nil
|
|
}
|
|
|
|
type tarsumHash struct {
|
|
hash.Hash
|
|
hdr *tar.Header
|
|
}
|
|
|
|
// Reset resets the Hash to its initial state.
|
|
func (tsh *tarsumHash) Reset() {
|
|
// comply with hash.Hash and reset to the state hash had before any writes
|
|
tsh.Hash.Reset()
|
|
tarsum.WriteV1Header(tsh.hdr, tsh.Hash)
|
|
}
|