Ignore symlinks within directory and permission tests (#254)

Symlinks will always display as `777` files, so we can ignore them by
default when running recursive tests. If we care about a specific
symlink permission, we can use a `file` check similar to what our test
does.

Signed-off-by: egibs <[email protected]>

Author: egibs

pkg/structure/structure.go

@@ -231,6 +231,11 @@ func (d DirsCondition) Check(i v1.Image) error {
 					return err
 				}
 
+				// ignore symlinks which will register as 777
+				if d.Type()&fs.ModeSymlink == fs.ModeSymlink {
+					return nil
+				}
+
 				if dir.FilesOnly && d.IsDir() {
 					return nil
 				}
@@ -312,6 +317,11 @@ func (p PermissionsCondition) Check(i v1.Image) error {
 				return err
 			}
 
+			// ignore symlinks which will register as 777
+			if d.Type()&fs.ModeSymlink == fs.ModeSymlink {
+				return nil
+			}
+
 			fi, err := d.Info()
 			if err != nil {
 				errs = append(errs, err)