Remove uses of utcnow in non-vendored code (#12006)

* Remove reference to utcnow

This cleans up some of the datetime handling in the self check.

Note that this changes the format of the state file, since the datetime
now uses ``.isoformat()`` instead of ``.strftime``. Reading an outdated
state file will still work on Python 3.11+, but not on earlier versions.

* Use aware datetime object in x509.CertificateBuilder

news/12005.bugfix.rst

@@ -0,0 +1 @@
+Removed uses of ``datetime.datetime.utcnow`` from non-vendored code.

src/pip/_internal/self_outdated_check.py

@@ -28,8 +28,7 @@
 from pip._internal.utils.filesystem import adjacent_tmp_file, check_path_owner, replace
 from pip._internal.utils.misc import ensure_dir
 
-_DATE_FMT = "%Y-%m-%dT%H:%M:%SZ"
-
+_WEEK = datetime.timedelta(days=7)
 
 logger = logging.getLogger(__name__)
 
@@ -73,12 +72,10 @@ def get(self, current_time: datetime.datetime) -> Optional[str]:
         if "pypi_version" not in self._state:
             return None
 
-        seven_days_in_seconds = 7 * 24 * 60 * 60
-
         # Determine if we need to refresh the state
-        last_check = datetime.datetime.strptime(self._state["last_check"], _DATE_FMT)
-        seconds_since_last_check = (current_time - last_check).total_seconds()
-        if seconds_since_last_check > seven_days_in_seconds:
+        last_check = datetime.datetime.fromisoformat(self._state["last_check"])
+        time_since_last_check = current_time - last_check
+        if time_since_last_check > _WEEK:
             return None
 
         return self._state["pypi_version"]
@@ -100,7 +97,7 @@ def set(self, pypi_version: str, current_time: datetime.datetime) -> None:
             # Include the key so it's easy to tell which pip wrote the
             # file.
             "key": self.key,
-            "last_check": current_time.strftime(_DATE_FMT),
+            "last_check": current_time.isoformat(),
             "pypi_version": pypi_version,
         }
 
@@ -229,7 +226,7 @@ def pip_self_version_check(session: PipSession, options: optparse.Values) -> Non
     try:
         upgrade_prompt = _self_version_check_logic(
             state=SelfCheckState(cache_dir=options.cache_dir),
-            current_time=datetime.datetime.utcnow(),
+            current_time=datetime.datetime.now(datetime.timezone.utc),
             local_version=installed_dist.version,
             get_remote_version=functools.partial(
                 _get_current_remote_pip_version, session, options

tests/lib/certs.py

@@ -1,4 +1,4 @@
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from typing import Tuple
 
 from cryptography import x509
@@ -23,8 +23,8 @@ def make_tls_cert(hostname: str) -> Tuple[x509.Certificate, rsa.RSAPrivateKey]:
         .issuer_name(issuer)
         .public_key(key.public_key())
         .serial_number(x509.random_serial_number())
-        .not_valid_before(datetime.utcnow())
-        .not_valid_after(datetime.utcnow() + timedelta(days=10))
+        .not_valid_before(datetime.now(timezone.utc))
+        .not_valid_after(datetime.now(timezone.utc) + timedelta(days=10))
         .add_extension(
             x509.SubjectAlternativeName([x509.DNSName(hostname)]),
             critical=False,

tests/unit/test_self_check_outdated.py

@@ -49,7 +49,9 @@ def test_pip_self_version_check_calls_underlying_implementation(
     mocked_state.assert_called_once_with(cache_dir=str(tmpdir))
     mocked_function.assert_called_once_with(
         state=mocked_state(cache_dir=str(tmpdir)),
-        current_time=datetime.datetime(1970, 1, 2, 11, 0, 0),
+        current_time=datetime.datetime(
+            1970, 1, 2, 11, 0, 0, tzinfo=datetime.timezone.utc
+        ),
         local_version=ANY,
         get_remote_version=ANY,
     )
@@ -167,14 +169,17 @@ def test_writes_expected_statefile(self, tmpdir: Path) -> None:
 
         # WHEN
         state = self_outdated_check.SelfCheckState(cache_dir=str(cache_dir))
-        state.set("1.0.0", datetime.datetime(2000, 1, 1, 0, 0, 0))
+        state.set(
+            "1.0.0",
+            datetime.datetime(2000, 1, 1, 0, 0, 0, tzinfo=datetime.timezone.utc),
+        )
 
         # THEN
         assert state._statefile_path == os.fspath(expected_path)
 
         contents = expected_path.read_text()
         assert json.loads(contents) == {
             "key": sys.prefix,
-            "last_check": "2000-01-01T00:00:00Z",
+            "last_check": "2000-01-01T00:00:00+00:00",
             "pypi_version": "1.0.0",
         }