Add context to mount errors

This makes it more obvious why a mount failed.

PiperOrigin-RevId: 224203880
Change-Id: I7961774a7b6fdbb5493a791f8b3815c49b8f7631

1 files changed, 2 insertions, 2 deletions

diff --git a/pkg/sentry/fs/overlay.go b/pkg/sentry/fs/overlay.go
index 036c0f733..8ace4ee64 100644
--- a/pkg/sentry/fs/overlay.go
+++ b/pkg/sentry/fs/overlay.go
@@ -95,10 +95,10 @@ func isXattrOverlay(name string) bool {
 // - lower must not have dynamic file/directory content.
 func NewOverlayRoot(ctx context.Context, upper *Inode, lower *Inode, flags MountSourceFlags) (*Inode, error) {
 	if !IsDir(upper.StableAttr) {
-		return nil, fmt.Errorf("upper Inode is not a directory")
+		return nil, fmt.Errorf("upper Inode is a %v, not a directory", upper.StableAttr.Type)
 	}
 	if !IsDir(lower.StableAttr) {
-		return nil, fmt.Errorf("lower Inode is not a directory")
+		return nil, fmt.Errorf("lower Inode is a %v, not a directory", lower.StableAttr.Type)
 	}
 	if upper.overlay != nil {
 		return nil, fmt.Errorf("cannot nest overlay in upper file of another overlay")