Function OpenChainFile

plumbing/format/commitgraph/v2/chain.go:18–40

OpenChainFile reads a commit chain file and returns a slice of the hashes within it Commit-Graph chains are described at https://git-scm.com/docs/commit-graph and are new line separated list of graph file hashes, oldest to newest. This function simply reads the file and returns the hashes as a sli

(r io.Reader)

//
// This function simply reads the file and returns the hashes as a slice.
func OpenChainFile(r io.Reader) ([]string, error) {
	if r == nil {
		return nil, io.ErrUnexpectedEOF
	}
	bufRd := bufio.NewReader(r)
	chain := make([]string, 0, 8)
	for {
		line, err := bufRd.ReadSlice('\n')
		if err != nil {
			if err == io.EOF {
				break
			}
			return nil, err
		}

		hashStr := string(line[:len(line)-1])
		if !plumbing.IsHash(hashStr) {
			return nil, ErrMalformedCommitGraphFile
		}
		chain = append(chain, hashStr)
	}
	return chain, nil
}

// OpenChainOrFileIndex expects a billy.Filesystem representing a .git directory.
// It will first attempt to read a commit-graph index file, before trying to read a