test: '{. -> ./mod}/test_util_rmrf.py'

Move the rmrf tests to the module-level tests and align its
implementation with the others.

test/mod/test_util_rmrf.py

@@ -0,0 +1,47 @@
+#
+# Tests for the `osbuild.util.rmrf` module.
+#
+
+import os
+import pathlib
+import shutil
+import subprocess
+import tempfile
+import unittest
+
+from osbuild.util import rmrf
+
+
+def can_set_immutable():
+    with tempfile.TemporaryDirectory(dir="/var/tmp") as tmp:
+        try:
+            os.makedirs(f"{tmp}/f")
+            # fist they give it ...
+            subprocess.run(["chattr", "+i", f"{tmp}/f"], check=True)
+            # ... then they take it away
+            subprocess.run(["chattr", "-i", f"{tmp}/f"], check=True)
+        except (subprocess.CalledProcessError, FileNotFoundError):
+            return False
+        return True
+
+
+class TestUtilLinux(unittest.TestCase):
+    @unittest.skipUnless(can_set_immutable(), "Need root permissions")
+    def test_rmtree_immutable(self):
+        #
+        # Test the `rmrf.rmtree()` helper and verify it can correctly unlink
+        # files that are marked immutable.
+        #
+
+        with tempfile.TemporaryDirectory(dir="/var/tmp") as vartmpdir:
+            os.makedirs(f"{vartmpdir}/dir")
+
+            p = pathlib.Path(f"{vartmpdir}/dir/immutable")
+            p.touch()
+            subprocess.run(["chattr", "+i", f"{vartmpdir}/dir/immutable"],
+                           check=True)
+
+            with self.assertRaises(PermissionError):
+                shutil.rmtree(f"{vartmpdir}/dir")
+
+            rmrf.rmtree(f"{vartmpdir}/dir")