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- 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)
- }
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