Do not process rev for local or meta hooks

sync_pre_commit_deps.py

@@ -5,6 +5,7 @@
 
 import ruamel.yaml
 
+REPOS_WITHOUT_REV = frozenset(('local', 'meta'))
 SUPPORTED = frozenset(('black', 'flake8', 'mypy'))
 
 
@@ -53,12 +54,13 @@ def main(argv: Sequence[str] | None = None) -> int:
     # TODO - validate schema?
     versions = {}
     for repo in loaded['repos']:
-        for hook in repo['hooks']:
-            if (hid := hook['id']) in SUPPORTED:
-                # `mirrors-mypy` uses versions with a 'v' prefix, so we have to
-                # strip it out to get the mypy version.
-                cleaned_rev = repo['rev'].removeprefix('v')
-                versions[hid] = cleaned_rev
+        if repo['repo'] not in REPOS_WITHOUT_REV:
+            for hook in repo['hooks']:
+                if (hid := hook['id']) in SUPPORTED:
+                    # `mirrors-mypy` uses versions with a 'v' prefix, so we have to
+                    # strip it out to get the mypy version.
+                    cleaned_rev = repo['rev'].removeprefix('v')
+                    versions[hid] = cleaned_rev
 
     updated = []
     for repo in loaded['repos']:

tests/sync_pre_commit_deps_test.py

@@ -1,22 +1,43 @@
 from __future__ import annotations
 
+import pytest
+
 from sync_pre_commit_deps import main
 
 
-def test_main_noop(tmpdir):
-    s = (
-        'repos:\n'
-        '-   repo: https://github.com/psf/black\n'
-        '    rev: 23.3.0\n'
-        '    hooks:\n'
-        '    -   id: black\n'
-        '-   repo: https://github.com/adamchainz/blacken-docs\n'
-        '    rev: 1.15.0\n'
-        '    hooks:\n'
-        '    -   id: blacken-docs\n'
-        '        additional_dependencies:\n'
-        '        -   black==23.3.0\n'
-    )
+@pytest.mark.parametrize(
+    ('s',),
+    (
+        pytest.param(
+            'repos:\n'
+            '-   repo: https://github.com/psf/black\n'
+            '    rev: 23.3.0\n'
+            '    hooks:\n'
+            '    -   id: black\n'
+            '-   repo: https://github.com/adamchainz/blacken-docs\n'
+            '    rev: 1.15.0\n'
+            '    hooks:\n'
+            '    -   id: blacken-docs\n'
+            '        additional_dependencies:\n'
+            '        -   black==23.3.0\n',
+            id='already correct version',
+        ),
+        pytest.param(
+            'repos:\n'
+            '-   repo: local\n'
+            '    hooks:\n'
+            '    -   id: mypy\n'
+            '-   repo: https://github.com/nbQA-dev/nbQA\n'
+            '    rev: 1.9.1\n'
+            '    hooks:\n'
+            '    -   id: nbqa-mypy\n'
+            '        additional_dependencies:\n'
+            '        -   mypy==0.123\n',
+            id='local hook shadows supported lib',
+        ),
+    ),
+)
+def test_main_noop(tmpdir, s):
     cfg = tmpdir.join('.pre-commit-config.yaml')
     cfg.write(s)