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moby--moby/pkg/chrootarchive/diff_windows.go
Stefan J. Wernli 230cfc6ed2 Fixing Tar functions to support Windows long paths.
Signed-off-by: Stefan J. Wernli <swernli@microsoft.com>
2015-08-11 16:07:36 -07:00

46 lines
1.1 KiB
Go

package chrootarchive
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"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.Reader, decompress bool) (size int64, err error) {
dest = filepath.Clean(dest)
// Ensure it is a Windows-style volume path
if !strings.HasPrefix(dest, `\\?\`) {
dest = `\\?\` + 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
}