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Merge pull request #24003 from tonistiigi/fix-duplicate-layers

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Fix duplicate layers in exported tar
This commit is contained in:
Alexander Morozov 2016-06-30 17:07:58 -07:00 • committed by GitHub
commit 9809446060
1 changed files with 33 additions and 20 deletions
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25
image/tarexport/save.go
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@ -29,6 +29,7 @@ type saveSession struct {
outDir string
images map[image.ID]*imageDescriptor
savedLayers map[string]struct{}
diffIDPaths map[layer.DiffID]string // cache every diffID blob to avoid duplicates
}
func (l *tarexporter) Save(names []string, outStream io.Writer) error {
@ -117,6 +118,7 @@ func (l *tarexporter) parseNames(names []string) (map[image.ID]*imageDescriptor,
func (s *saveSession) save(outStream io.Writer) error {
s.savedLayers = make(map[string]struct{})
s.diffIDPaths = make(map[layer.DiffID]string)
// get image json
tempDir, err := ioutil.TempDir("", "docker-export-")
@ -297,18 +299,27 @@ func (s *saveSession) saveLayer(id layer.ChainID, legacyImg image.V1Image, creat
}
// serialize filesystem
tarFile, err := os.Create(filepath.Join(outDir, legacyLayerFileName))
if err != nil {
return distribution.Descriptor{}, err
}
defer tarFile.Close()
layerPath := filepath.Join(outDir, legacyLayerFileName)
l, err := s.ls.Get(id)
if err != nil {
return distribution.Descriptor{}, err
}
defer layer.ReleaseAndLog(s.ls, l)
if oldPath, exists := s.diffIDPaths[l.DiffID()]; exists {
relPath, err := filepath.Rel(layerPath, oldPath)
if err != nil {
return distribution.Descriptor{}, err
}
os.Symlink(relPath, layerPath)
} else {
tarFile, err := os.Create(layerPath)
if err != nil {
return distribution.Descriptor{}, err
}
defer tarFile.Close()
arch, err := l.TarStream()
if err != nil {
return distribution.Descriptor{}, err
@ -326,6 +337,8 @@ func (s *saveSession) saveLayer(id layer.ChainID, legacyImg image.V1Image, creat
}
}
s.diffIDPaths[l.DiffID()] = layerPath
}
s.savedLayers[legacyImg.ID] = struct{}{}
var src distribution.Descriptor