libbtrfsutil: fix Python tests

These were broken when the patch series got shuffled around.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

libbtrfsutil/python/tests/__init__.py

@@ -0,0 +1,66 @@
+# Copyright (C) 2018 Facebook
+#
+# This file is part of libbtrfsutil.
+#
+# libbtrfsutil is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# libbtrfsutil is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with libbtrfsutil.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+from pathlib import PurePath
+import subprocess
+import tempfile
+import unittest
+
+
+HAVE_PATH_LIKE = hasattr(PurePath, '__fspath__')
+
+
+@unittest.skipIf(os.geteuid() != 0, 'must be run as root')
+class BtrfsTestCase(unittest.TestCase):
+    def setUp(self):
+        self.mountpoint = tempfile.mkdtemp()
+        try:
+            with tempfile.NamedTemporaryFile(delete=False) as f:
+                os.truncate(f.fileno(), 1024 * 1024 * 1024)
+                self.image = f.name
+        except Exception as e:
+            os.rmdir(self.mountpoint)
+            raise e
+
+        try:
+            subprocess.check_call(['mkfs.btrfs', '-q', self.image])
+            subprocess.check_call(['mount', '-o', 'loop', '--', self.image, self.mountpoint])
+        except Exception as e:
+            os.remove(self.image)
+            os.rmdir(self.mountpoint)
+            raise e
+
+    def tearDown(self):
+        try:
+            subprocess.check_call(['umount', self.mountpoint])
+        finally:
+            os.remove(self.image)
+            os.rmdir(self.mountpoint)
+
+    @staticmethod
+    def path_or_fd(path, open_flags=os.O_RDONLY):
+        yield path
+        yield path.encode()
+        if HAVE_PATH_LIKE:
+            yield PurePath(path)
+        fd = os.open(path, open_flags)
+        try:
+            yield fd
+        finally:
+            os.close(fd)
+