feat(toxgen): Remove merge conflict-prone last updated timestamp

Author: sentrivana

scripts/populate_tox/populate_tox.py

@@ -8,6 +8,7 @@
 import hashlib
 import json
 import os
+import subprocess
 import sys
 import time
 from bisect import bisect_left
@@ -509,9 +510,7 @@ def _render_dependencies(integration: str, releases: list[Version]) -> list[str]
     return rendered
 
 
-def write_tox_file(
-    packages: dict, update_timestamp: bool, last_updated: datetime
-) -> None:
+def write_tox_file(packages: dict) -> None:
     template = ENV.get_template("tox.jinja")
 
     context = {"groups": {}}
@@ -530,11 +529,6 @@ def write_tox_file(
                 }
             )
 
-    if update_timestamp:
-        context["updated"] = datetime.now(tz=timezone.utc).isoformat()
-    else:
-        context["updated"] = last_updated.isoformat()
-
     rendered = template.render(context)
 
     with open(TOX_FILE, "w") as file:
@@ -623,19 +617,16 @@ def get_file_hash() -> str:
 
 
 def get_last_updated() -> Optional[datetime]:
-    timestamp = None
-
-    with open(TOX_FILE, "r") as f:
-        for line in f:
-            if line.startswith("# Last generated:"):
-                timestamp = datetime.fromisoformat(line.strip().split()[-1])
-                break
-
-    if timestamp is None:
-        print(
-            "Failed to find out when tox.ini was last generated; the timestamp seems to be missing from the file."
+    timestamp = (
+        subprocess.run(
+            ["git", "log", "-1", "--pretty=%ct", "../tox.ini"],
+            capture_output=True,
         )
-
+        .stdout.decode("utf-8")
+        .strip()
+    )
+    timestamp = datetime.fromtimestamp(int(timestamp), timezone.utc)
+    print(f"Last tox.ini update: {timestamp}")
     return timestamp
 
 
@@ -675,7 +666,7 @@ def main(fail_on_changes: bool = False) -> None:
     print(f"Running in {'fail_on_changes' if fail_on_changes else 'normal'} mode.")
     last_updated = get_last_updated()
     if fail_on_changes:
-        # We need to make the script ignore any new releases after the `last_updated`
+        # We need to make the script ignore any new releases after the last updated
         # timestamp so that we don't fail CI on a PR just because a new package
         # version was released, leading to unrelated changes in tox.ini.
         print(
@@ -769,9 +760,7 @@ def main(fail_on_changes: bool = False) -> None:
     if fail_on_changes:
         old_file_hash = get_file_hash()
 
-    write_tox_file(
-        packages, update_timestamp=not fail_on_changes, last_updated=last_updated
-    )
+    write_tox_file(packages)
 
     # Sort the release cache file
     releases = []

scripts/populate_tox/tox.jinja

@@ -9,8 +9,6 @@
 # or in the script (if you want to change the auto-generated part).
 # The file (and all resulting CI YAMLs) then need to be regenerated via
 # "scripts/generate-test-files.sh".
-#
-# Last generated: {{ updated }}
 
 [tox]
 requires =

tox.ini

@@ -9,8 +9,6 @@
 # or in the script (if you want to change the auto-generated part).
 # The file (and all resulting CI YAMLs) then need to be regenerated via
 # "scripts/generate-test-files.sh".
-#
-# Last generated: 2025-09-24T08:25:49.003370+00:00
 
 [tox]
 requires =