motiejus/undocker
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Motiejus Jakštys 2021-05-24 00:11:58 +03:00
parent 628b178e23
commit ae9c197be0
1 changed files with 8 additions and 8 deletions
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16
rootfs/rootfs.go
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@ -25,7 +25,6 @@ var (
)
type dockerManifestJSON []struct {
Config string `json:"Config,omitempty"`
Layers []string `json:"Layers"`
}
@ -86,14 +85,14 @@ func RootFS(in io.ReadSeeker, out io.Writer) (err error) {
// file2layer maps a filename to layer number (index in "layers")
file2layer := map[string]int{}
// whreaddir maps `wh..wh..opq` file to a layer.
// whreaddir maps `wh..wh..opq` file to a layer; see doc.go
whreaddir := map[string]int{}
// wh maps a filename to a layer until which it should be ignored,
// inclusively.
// inclusively; see doc.go
wh := map[string]int{}
// build up `file2layer`, `whreaddir`, `wh`
// iterate over all files, construct `file2layer`, `whreaddir`, `wh`
for i, offset := range layers {
if _, err := in.Seek(offset, io.SeekStart); err != nil {
return err
@ -111,8 +110,9 @@ func RootFS(in io.ReadSeeker, out io.Writer) (err error) {
continue
}
// according to aufs documentation, whiteout files should be hardlinks.
// I saw at least one docker container using regular files for whiteout.
// according to aufs documentation, whiteout files should be
// hardlinks. I saw at least one docker container using regular
// files for whiteouts.
if hdr.Typeflag == tar.TypeLink || hdr.Typeflag == tar.TypeReg {
basename := filepath.Base(hdr.Name)
basedir := filepath.Dir(hdr.Name)
@ -130,10 +130,10 @@ func RootFS(in io.ReadSeeker, out io.Writer) (err error) {
}
}
// construct directories to ignore, by layer.
// construct directories to whiteout, for each layer.
whIgnore := whiteoutDirs(whreaddir, len(layers))
// iterate through all layers and write files.
// iterate through all layers, all files, and write files.
for i, offset := range layers {
if _, err := in.Seek(offset, io.SeekStart); err != nil {
return err