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package chrootarchive
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/containers/storage/pkg/archive"
"github.com/containers/storage/pkg/longpath"
)
// 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 io.Reader, options *archive.TarOptions, decompress bool) (size int64, err error) {
dest = filepath.Clean(dest)
// Ensure it is a Windows-style volume path
dest = longpath.AddPrefix(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-storage-extract")
if err != nil {
return 0, fmt.Errorf("ApplyLayer failed to create temp-storage-extract under %s. %s", dest, err)
}
s, err := archive.UnpackLayer(dest, layer, nil)
os.RemoveAll(tmpDir)
if err != nil {
return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s: %s", layer, dest, err)
}
return s, nil
}
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