From 7f2cbda4de7d854d3e9f475b1e762058858d6167 Mon Sep 17 00:00:00 2001
From: Max R <mxr@users.noreply.github.com>
Date: Thu, 28 May 2026 18:23:52 -0400
Subject: [PATCH] Warn for invalid --repo

---
 pre_commit/commands/autoupdate.py | 11 +++++++++++
 tests/commands/autoupdate_test.py | 11 +++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/pre_commit/commands/autoupdate.py b/pre_commit/commands/autoupdate.py
index aa0c5e25e..80c9a3b78 100644
--- a/pre_commit/commands/autoupdate.py
+++ b/pre_commit/commands/autoupdate.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import concurrent.futures
+import logging
 import os.path
 import re
 import tempfile
@@ -24,6 +25,8 @@
 from pre_commit.yaml import yaml_dump
 from pre_commit.yaml import yaml_load
 
+logger = logging.getLogger('pre_commit')
+
 
 class RevInfo(NamedTuple):
     repo: str
@@ -176,6 +179,14 @@ def autoupdate(
         if repo['repo'] not in {LOCAL, META}
     ]
 
+    missing_repos = set(repos) - {r['repo'] for r in config_repos}
+    if missing_repos:
+        logger.warning(
+            f'repos {", ".join(sorted(missing_repos))!r} were '
+            f'not found in {config_file}. this will return '
+            'an error in a future release.',
+        )
+
     rev_infos: list[RevInfo | None] = [None] * len(config_repos)
     jobs = jobs or xargs.cpu_count()  # 0 => number of cpus
     jobs = min(jobs, len(repos) or len(config_repos))  # max 1-per-thread
diff --git a/tests/commands/autoupdate_test.py b/tests/commands/autoupdate_test.py
index 71bd04446..6165a62ee 100644
--- a/tests/commands/autoupdate_test.py
+++ b/tests/commands/autoupdate_test.py
@@ -260,8 +260,8 @@ def test_autoupdate_out_of_date_repo_with_correct_repo_name(
     assert 'local' in after
 
 
-def test_autoupdate_out_of_date_repo_with_wrong_repo_name(
-        out_of_date, in_tmpdir,
+def test_autoupdate_missing_repo_name(
+        out_of_date, caplog, in_tmpdir,
 ):
     config = make_config_from_repo(
         out_of_date.path, rev=out_of_date.original_rev, check=False,
@@ -270,15 +270,18 @@ def test_autoupdate_out_of_date_repo_with_wrong_repo_name(
 
     with open(C.CONFIG_FILE) as f:
         before = f.read()
-    # It will not update it, because the name doesn't match
     ret = autoupdate(
         C.CONFIG_FILE, freeze=False, tags_only=False,
-        repos=('dne',),
+        repos=('dne', 'foo'),
     )
     with open(C.CONFIG_FILE) as f:
         after = f.read()
     assert ret == 0
     assert before == after
+    assert caplog.records[0].message == (
+        "repos 'dne, foo' were not found in .pre-commit-config.yaml. "
+        'this will return an error in a future release.'
+    )
 
 
 def test_does_not_reformat(tmpdir, out_of_date):