diff options
Diffstat (limited to 'tools/nixery/server/builder/archive.go')
| -rw-r--r-- | tools/nixery/server/builder/archive.go | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/tools/nixery/server/builder/archive.go b/tools/nixery/server/builder/archive.go index 55b3c2a8b79c..a3fb99882fd6 100644 --- a/tools/nixery/server/builder/archive.go +++ b/tools/nixery/server/builder/archive.go @@ -10,6 +10,8 @@ package builder import ( "archive/tar" "compress/gzip" + "crypto/sha256" + "fmt" "io" "os" "path/filepath" @@ -19,26 +21,31 @@ import ( // Create a new compressed tarball from each of the paths in the list // and write it to the supplied writer. -func packStorePaths(l *layers.Layer, w io.Writer) error { +// +// The uncompressed tarball is hashed because image manifests must +// contain both the hashes of compressed and uncompressed layers. +func packStorePaths(l *layers.Layer, w io.Writer) (string, error) { + shasum := sha256.New() gz := gzip.NewWriter(w) - t := tar.NewWriter(gz) + multi := io.MultiWriter(shasum, gz) + t := tar.NewWriter(multi) for _, path := range l.Contents { err := filepath.Walk(path, tarStorePath(t)) if err != nil { - return err + return "", err } } if err := t.Close(); err != nil { - return err + return "", err } if err := gz.Close(); err != nil { - return err + return "", err } - return nil + return fmt.Sprintf("sha256:%x", shasum.Sum([]byte{})), nil } func tarStorePath(w *tar.Writer) filepath.WalkFunc { |