PYTHON-5240 Add pre-commit hook for config generation (#2237)

.evergreen/scripts/generate-config.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+# Entry point for the generate-config pre-commit hook.
+
+set -eu
+
+python .evergreen/scripts/generate_config.py

.evergreen/scripts/generate_config.py

@@ -1,12 +1,4 @@
-# /// script
-# requires-python = ">=3.9"
-# dependencies = [
-#   "shrub.py>=3.2.0",
-#   "pyyaml>=6.0.2"
-# ]
-# ///
-
-# Note: Run this file with `pipx run`, or `uv run`.
+# Note: See CONTRIBUTING.md for how to update/run this file.
 from __future__ import annotations
 
 import sys
@@ -1113,7 +1105,7 @@ def write_variants_to_file():
     with target.open("w") as fid:
         fid.write("buildvariants:\n")
 
-    for name, func in getmembers(mod, isfunction):
+    for name, func in sorted(getmembers(mod, isfunction)):
         if not name.endswith("_variants"):
             continue
         if not name.startswith("create_"):
@@ -1143,7 +1135,7 @@ def write_tasks_to_file():
     with target.open("w") as fid:
         fid.write("tasks:\n")
 
-    for name, func in getmembers(mod, isfunction):
+    for name, func in sorted(getmembers(mod, isfunction)):
         if not name.endswith("_tasks"):
             continue
         if not name.startswith("create_"):

.pre-commit-config.yaml

@@ -116,3 +116,9 @@ repos:
       (?x)(
           .evergreen/retry-with-backoff.sh
         )
+  - id: generate-config
+    name: generate-config
+    entry: .evergreen/scripts/generate-config.sh
+    language: python
+    require_serial: true
+    additional_dependencies: ["shrub.py>=3.2.0", "pyyaml>=6.0.2"]

CONTRIBUTING.md

@@ -367,7 +367,7 @@ If you are running one of the `no-responder` tests, omit the `run-server` step.
 - If there are any special test considerations, including not running `pytest` at all, handle it in `.evergreen/scripts/run_tests.py`.
 - If there are any services or atlas clusters to teardown, handle them in `.evergreen/scripts/teardown_tests.py`.
 - Add functions to generate the test variant(s) and task(s) to the `.evergreen/scripts/generate_config.py`.
-- Regenerate the test variants and tasks using the instructions in `.evergreen/scripts/generate_config.py`.
+- Regenerate the test variants and tasks using `pre-commit run --all-files generate-config`.
 - Make sure to add instructions for running the test suite to `CONTRIBUTING.md`.
 
 ## Re-sync Spec Tests