Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/commands/run_test.py

@@ -939,7 +939,7 @@ def test_classifier_normalizes_filenames_on_windows_to_forward_slashes(tmpdir):
         tmpdir.join('a/b/c').ensure()
         with mock.patch.object(os, 'altsep', '/'):
             with mock.patch.object(os, 'sep', '\\'):
-                classifier = Classifier((r'a\b\c',))
+                classifier = Classifier.from_config((r'a\b\c',), '', '^$')
                 assert classifier.filenames == ['a/b/c']
 
 
@@ -947,7 +947,7 @@ def test_classifier_does_not_normalize_backslashes_non_windows(tmpdir):
     with mock.patch.object(os.path, 'lexists', return_value=True):
         with mock.patch.object(os, 'altsep', None):
             with mock.patch.object(os, 'sep', '/'):
-                classifier = Classifier((r'a/b\c',))
+                classifier = Classifier.from_config((r'a/b\c',), '', '^$')
                 assert classifier.filenames == [r'a/b\c']
 
 
@@ -1022,3 +1022,18 @@ def test_args_hook_only(cap_out, store, repo_with_passing_hook):
         run_opts(hook='do_not_commit'),
     )
     assert b'identity-copy' not in printed
+
+
+def test_skipped_without_any_setup_for_post_checkout(in_git_dir, store):
+    environ = {'_PRE_COMMIT_SKIP_POST_CHECKOUT': '1'}
+    opts = run_opts(hook_stage='post-checkout')
+    assert run(C.CONFIG_FILE, store, opts, environ=environ) == 0
+
+
+def test_pre_commit_env_variable_set(cap_out, store, repo_with_passing_hook):
+    args = run_opts()
+    environ: EnvironT = {}
+    ret, printed = _do_run(
+        cap_out, store, repo_with_passing_hook, args, environ,
+    )
+    assert environ['PRE_COMMIT'] == '1'