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graph: preserve tar archive entries

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Preserve the entries from the tar archive for layers added to the graph.

With these entries and relative filesystem path, the tar archives can be
reassembled later.

Signed-off-by: Vincent Batts <vbatts@redhat.com>
This commit is contained in:
Vincent Batts 2015-06-20 10:14:24 -04:00
parent 7fb061832a
commit 5d9f06599c
2 changed files with 49 additions and 2 deletions
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25
graph/graph_unix.go
View file

@ -3,6 +3,7 @@
package graph
import (
"compress/gzip"
"encoding/json"
"fmt"
"os"
@ -90,7 +91,29 @@ func (graph *Graph) restoreBaseImages() ([]string, error) {
func (graph *Graph) storeImage(img *image.Image, layerData archive.ArchiveReader, root string) (err error) {
// Store the layer. If layerData is not nil, unpack it into the new layer
if layerData != nil {
if img.Size, err = graph.driver.ApplyDiff(img.ID, img.Parent, layerData); err != nil {
// this is saving the tar-split metadata
mf, err := os.OpenFile(filepath.Join(root, "tar-data.json.gz"), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
if err != nil {
return err
}
defer mf.Close()
mfz := gzip.NewWriter(mf)
defer mfz.Close()
metaPacker := storage.NewJSONPacker(mf)
inflatedLayerData, err := archive.DecompressStream(layerData)
if err != nil {
return err
}
// we're passing nil here for the file putter, because the ApplyDiff will
// handle the extraction of the archive
its, err := asm.NewInputTarStream(inflatedLayerData, metaPacker, nil)
if err != nil {
return err
}
if img.Size, err = graph.driver.ApplyDiff(img.ID, img.Parent, archive.ArchiveReader(its)); err != nil {
return err
}
}

26
graph/graph_windows.go
View file

@ -3,9 +3,11 @@
package graph
import (
"compress/gzip"
"encoding/json"
"fmt"
"os"
"path/filepath"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/daemon/graphdriver/windows"
@ -115,7 +117,29 @@ func (graph *Graph) storeImage(img *image.Image, layerData archive.ArchiveReader
// Store the layer. If layerData is not nil, unpack it into the new layer
if layerData != nil {
if img.Size, err = graph.driver.ApplyDiff(img.ID, img.Parent, layerData); err != nil {
// this is saving the tar-split metadata
mf, err := os.OpenFile(filepath.Join(root, "tar-data.json.gz"), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
if err != nil {
return err
}
defer mf.Close()
mfz := gzip.NewWriter(mf)
defer mfz.Close()
metaPacker := storage.NewJSONPacker(mf)
inflatedLayerData, err := archive.DecompressStream(layerData)
if err != nil {
return err
}
// we're passing nil here for the file putter, because the ApplyDiff will
// handle the extraction of the archive
its, err := asm.NewInputTarStream(inflatedLayerData, metaPacker, nil)
if err != nil {
return err
}
if img.Size, err = graph.driver.ApplyDiff(img.ID, img.Parent, archive.ArchiveReader(its)); err != nil {
return err
}
}