CI: add more tests for CODEOWNERS (MR 4940)

* Parse the file in python and ensure it is ordered alphabetically
* Ensure that we have at least as many gitlab nicknames in CODEOWNERS,
  as there are listed maintainers in main and community devices. This
  should help with enforcing that every maintainer is also listed in
  CODEOWNERS, so they can be easily pinged via their gitlab nickname if
  something for the device they maintain is happening.

[ci:skip-build]: already built successfully in CI

.ci/testcases/test_device.py

@@ -1,16 +1,26 @@
 #!/usr/bin/env python3
-# Copyright 2021 Oliver Smith
+# Copyright 2024 Oliver Smith
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+import fnmatch
 import glob
+import os
 import pytest
 import sys
-import os
 
 import add_pmbootstrap_to_import_path
 import pmb.parse
 import pmb.parse._apkbuild
 
+# Cache for codeowners_parse
+codeowners_parsed = {}
+
+# Don't complain if these nicknames are the only maintainers of an APKBUILD,
+# because they are actually a group of people
+gitlab_groups = [
+    "@sdm845-mainline",
+]
+
 
 def device_dependency_check(apkbuild, path):
     """ Raise an error if a device package has a dependency that is not allowed
@@ -100,23 +110,84 @@ def test_aports_device_kernel(args):
                                path)
 
 
+def codeowners_parse(args):
+    global codeowners_parsed
+
+    pattern_prev = None
+
+    with open(f"{args.aports}/CODEOWNERS") as h:
+        for line in h:
+            line = line.rstrip()
+            if not line or line.startswith("#"):
+                continue
+
+            pattern_nicks = line.split()
+            assert len(pattern_nicks) > 1, f"CODEOWNERS line without nicks: {line}"
+
+            pattern = pattern_nicks[0]
+            if pattern.endswith("/"):
+                pattern += "*"
+
+            nicks = []
+            for word in pattern_nicks[1:]:
+                if word.startswith("@"):
+                    nicks += [word]
+            codeowners_parsed[pattern] = nicks
+
+            if pattern_prev:
+                assert pattern_prev <= pattern, "CODEOWNERS: please order entries alphabetically"
+            pattern_prev = pattern
+
+
+def require_enough_codeowners_entries(args, path, maintainers):
+    """
+    :param path: full path to an APKBUILD (e.g. /home/user/…/APKBUILD)
+    :param maintainers: list of one or more maintainers
+    """
+    path = os.path.relpath(path, args.aports)
+
+    nicks = set()
+    for pattern, pattern_nicks in codeowners_parsed.items():
+        if fnmatch.fnmatch(path, pattern):
+            for nick in pattern_nicks:
+                nicks.add(nick)
+
+    print(f"{path}:")
+    print(f"  APKBUILD: {maintainers}")
+    print(f"  CODEOWNERS: {nicks}")
+
+    if len(nicks) < len(maintainers):
+        for nick in nicks:
+            if nick in gitlab_groups:
+                print(f"  -> {nick} is a group")
+                return
+
+    assert len(nicks) >= len(maintainers), \
+        f"{path}: make sure that each maintainer is listed in CODEOWNERS!"
+
+
 def test_aports_maintained(args):
     """
     Ensure that aports in /device/{main,community} have "Maintainer:" and
-    "Co-Maintainer:" (only required for main) listed in their APKBUILDs.
+    "Co-Maintainer:" (only required for main) listed in their APKBUILDs. Also
+    check that at least as many are listed in CODEOWNERS.
     """
+    codeowners_parse(args)
+
     for path in glob.iglob(f"{args.aports}/device/main/*/APKBUILD"):
         if '/firmware-' in path:
             continue
         maintainers = pmb.parse._apkbuild.maintainers(path)
         assert maintainers and len(maintainers) >= 2, \
             f"{path} in main needs at least 1 Maintainer and 1 Co-Maintainer"
+        require_enough_codeowners_entries(args, path, maintainers)
 
     for path in glob.iglob(f"{args.aports}/device/community/*/APKBUILD"):
         if '/firmware-' in path:
             continue
         maintainers = pmb.parse._apkbuild.maintainers(path)
         assert maintainers, f"{path} in community needs at least 1 Maintainer"
+        require_enough_codeowners_entries(args, path, maintainers)
 
 
 def test_aports_unmaintained(args):

CODEOWNERS

@@ -1,4 +1,5 @@
 # https://docs.gitlab.com/ee/user/project/code_owners.html
+# Put groups like @sdm845-mainline into test_device.py:gitlab_groups.
 # Order lines alphabetically!
 
 device/*/*-amlogic-s905*/			@vitali64yt