pre-commit: fix import bug for built-in hooks

And add regression test.

Closes #270805.

Co-Authored-By: Matt Rixman <MatrixManAtYrService@users.noreply.github.com>

pkgs/by-name/pr/pre-commit/package.nix

@@ -107,12 +107,6 @@ buildPythonApplication rec {
     deactivate
   '';
 
-  # Propagating dependencies leaks them through $PYTHONPATH which causes issues
-  # when used in nix-shell.
-  postFixup = ''
-    rm $out/nix-support/propagated-build-inputs
-  '';
-
   disabledTests = [
     # ERROR: The install method you used for conda--probably either `pip install conda`
     # or `easy_install conda`--is not compatible with using conda as an application.
@@ -182,8 +176,8 @@ buildPythonApplication rec {
     "pre_commit"
   ];
 
-  passthru.tests.version = testers.testVersion {
+  passthru.tests = callPackage ./tests.nix {
-    package = pre-commit;
+    inherit git pre-commit;
   };
 
   meta = with lib; {

pkgs/by-name/pr/pre-commit/tests.nix

@@ -0,0 +1,45 @@
+{
+  git,
+  pre-commit,
+  runCommand,
+  testers,
+}:
+{
+  check-meta-hooks =
+    runCommand "check-meta-hooks"
+      {
+        nativeBuildInputs = [
+          git
+          pre-commit
+        ];
+      }
+      ''
+        cd "$(mktemp --directory)"
+        export HOME="$PWD"
+        cat << 'EOF' > .pre-commit-config.yaml
+        repos:
+          - repo: local
+            hooks:
+              - id: echo
+                name: echo
+                entry: echo
+                files: \.yaml$
+                language: system
+          - repo: meta
+            hooks:
+              - id: check-hooks-apply
+              - id: check-useless-excludes
+              - id: identity
+        EOF
+        git config --global user.email "you@example.com"
+        git config --global user.name "Your Name"
+        git init --initial-branch=main
+        git add .
+        pre-commit run --all-files
+        touch $out
+      '';
+
+  version = testers.testVersion {
+    package = pre-commit;
+  };
+}