pytest4 complains if we directly call the fixture function, fixes #4172

just added a normal function with the code, call it from fixture and
also from unittest test method.

(cherry picked from commit d0a01c532ec63b7c5767ae6d5203b042afdbfd79)

src/borg/testsuite/archiver.py

@@ -55,7 +55,7 @@ from . import has_lchflags, has_llfuse
 from . import BaseTestCase, changedir, environment_variable, no_selinux
 from . import are_symlinks_supported, are_hardlinks_supported, are_fifos_supported, is_utime_fully_supported, is_birthtime_fully_supported
 from .platform import fakeroot_detected
-from .upgrader import attic_repo
+from .upgrader import make_attic_repo
 from . import key
 
 # 3.4.3 == first version with argparse bugfix for nargs='*' and 0 arguments given
@@ -2877,7 +2877,7 @@ id: 2 / e29442 3506da 4e1ea7 / 25f62a 5a3d41 - 02
             assert os.stat('input/dir1/source2').st_nlink == 2
 
     def test_detect_attic_repo(self):
-        path = attic_repo(self.repository_path)
+        path = make_attic_repo(self.repository_path)
         cmds = [
             ['create', path + '::test', self.tmpdir],
             ['extract', path + '::test'],

src/borg/testsuite/upgrader.py

@@ -58,16 +58,20 @@ def key_valid(path):
         return f.read().startswith(KeyfileKey.FILE_ID)
 
 
-@pytest.fixture()
-def attic_repo(tmpdir):
+def make_attic_repo(dir):
     """
     create an attic repo with some stuff in it
 
-    :param tmpdir: path to the repository to be created
+    :param dir: path to the repository to be created
     :returns: path to attic repository
     """
     # there is some stuff in that repo, copied from `RepositoryTestCase.test1`
-    return untar(ATTIC_TAR, str(tmpdir), 'repo')
+    return untar(ATTIC_TAR, str(dir), 'repo')
+
+
+@pytest.fixture()
+def attic_repo(tmpdir):
+    return make_attic_repo(tmpdir)
 
 
 @pytest.fixture(params=[True, False])