Run mypy through a pyenv/virtualenv enabler wrapper script (#30922)

script/gen_requirements_all.py

@@ -253,7 +253,7 @@ def requirements_test_output(reqs):
 
 def requirements_pre_commit_output():
     """Generate output for pre-commit dependencies."""
-    source = ".pre-commit-config-all.yaml"
+    source = ".pre-commit-config.yaml"
     pre_commit_conf = load_yaml(source)
     reqs = []
     for repo in (x for x in pre_commit_conf["repos"] if x.get("rev")):

script/run-in-env.sh

@@ -0,0 +1,18 @@
+#!/bin/sh -eu
+
+# Activate pyenv and virtualenv if present, then run the specified command
+
+# pyenv, pyenv-virtualenv
+if [ -s .python-version ]; then
+    PYENV_VERSION=$(head -n 1 .python-version)
+    export PYENV_VERSION
+fi
+
+# other common virtualenvs
+for venv in venv .venv .; do
+    if [ -f $venv/bin/activate ]; then
+        . $venv/bin/activate
+    fi
+done
+
+exec "$@"