fix: report errors correctly when pulling, fix EEXIST

Kaniko adds an entry for the root folder `/` in its tarballs.
Processing the file causes the process to hang when trying to
recreate the destination directory.

The root directory already exists, so it triggers an error, but as the
errors were not correctly propagated, the process hangs forever.

Fix both issues.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>

pkg/archiver/untar.go

@@ -47,10 +47,10 @@ func Untar(ctx context.Context, r io.Reader, rootPath string) error {
 
 		switch hdr.Typeflag {
 		case tar.TypeDir:
-			mode := hdr.FileInfo().Mode()
+			mode := hdr.FileInfo().Mode() & os.ModePerm
 			mode |= 0o700 // make rwx for the owner
 
-			if err = os.Mkdir(path, mode); err != nil {
+			if err = os.Mkdir(path, mode); err != nil && !os.IsExist(err) {
 				return fmt.Errorf("error creating directory %q mode %s: %w", path, mode, err)
 			}
 

pkg/imager/profile/input.go

@@ -353,13 +353,25 @@ func (c *ContainerAsset) Extract(ctx context.Context, destination, arch string,
 	eg, ctx := errgroup.WithContext(ctx)
 
 	eg.Go(func() error {
-		defer w.Close() //nolint:errcheck
+		if exportErr := crane.Export(img, w); exportErr != nil {
+			w.CloseWithError(exportErr)
 
-		return crane.Export(img, w)
+			return exportErr
+		}
+
+		w.Close() //nolint:errcheck
+
+		return nil
 	})
 
 	eg.Go(func() error {
-		return archiver.Untar(ctx, r, destination)
+		if untarErr := archiver.Untar(ctx, r, destination); untarErr != nil {
+			r.CloseWithError(untarErr)
+
+			return untarErr
+		}
+
+		return nil
 	})
 
 	return eg.Wait()