Checking for protected dirs must be against mountPoint and not location

The validation code was written at a time when all mounts were mounted at
`location` inside the guest because there was no separate `mountPoint` setting.

Now that `mountPoint` exists, the only validation for `location` is that
the path exists on the host and designates a directory. All validation to
protect guest directories must be done against `mountPoint`.

Signed-off-by: Jan Dubois <jan.dubois@suse.com>

pkg/limayaml/validate.go

@@ -152,14 +152,6 @@ func Validate(y *LimaYAML, warn bool) error {
 		if err != nil {
 			return fmt.Errorf("field `mounts[%d].location` refers to an unexpandable path: %q: %w", i, f.Location, err)
 		}
-		switch loc {
-		case "/", "/bin", "/dev", "/etc", "/home", "/opt", "/sbin", "/tmp", "/usr", "/var":
-			return fmt.Errorf("field `mounts[%d].location` must not be a system path such as /etc or /usr", i)
-		// home directory defined in "cidata.iso:/user-data"
-		case *y.User.Home:
-			return fmt.Errorf("field `mounts[%d].location` is the reserved internal home directory", i)
-		}
-
 		st, err := os.Stat(loc)
 		if err != nil {
 			if !errors.Is(err, os.ErrNotExist) {
@@ -169,6 +161,14 @@ func Validate(y *LimaYAML, warn bool) error {
 			return fmt.Errorf("field `mounts[%d].location` refers to a non-directory path: %q: %w", i, f.Location, err)
 		}
 
+		switch *f.MountPoint {
+		case "/", "/bin", "/dev", "/etc", "/home", "/opt", "/sbin", "/tmp", "/usr", "/var":
+			return fmt.Errorf("field `mounts[%d].mountPoint` must not be a system path such as /etc or /usr", i)
+		// home directory defined in "cidata.iso:/user-data"
+		case *y.User.Home:
+			return fmt.Errorf("field `mounts[%d].mountPoint` is the reserved internal home directory %q", i, *y.User.Home)
+		}
+
 		if _, err := units.RAMInBytes(*f.NineP.Msize); err != nil {
 			return fmt.Errorf("field `msize` has an invalid value: %w", err)
 		}