39 lines
976 B
Go
39 lines
976 B
Go
package chrootarchive
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
|
|
"github.com/docker/docker/pkg/archive"
|
|
)
|
|
|
|
// applyLayerHandler parses a diff in the standard layer format from `layer`, and
|
|
// applies it to the directory `dest`. Returns the size in bytes of the
|
|
// contents of the layer.
|
|
func applyLayerHandler(dest string, layer archive.ArchiveReader, decompress bool) (size int64, err error) {
|
|
dest = filepath.Clean(dest)
|
|
if decompress {
|
|
decompressed, err := archive.DecompressStream(layer)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer decompressed.Close()
|
|
|
|
layer = decompressed
|
|
}
|
|
|
|
tmpDir, err := ioutil.TempDir(os.Getenv("temp"), "temp-docker-extract")
|
|
if err != nil {
|
|
return 0, fmt.Errorf("ApplyLayer failed to create temp-docker-extract under %s. %s", dest, err)
|
|
}
|
|
|
|
s, err := archive.UnpackLayer(dest, layer)
|
|
os.RemoveAll(tmpDir)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s", err, dest)
|
|
}
|
|
|
|
return s, nil
|
|
}
|