pre-commit: installed git hook should have full path to binary (#77638)

pre-commit currently install impure Git hooks that look for the
`pre-commit` binary in PATH. If the user has `pre-commit` loaded via a
nix-shell instead of having it installed then GUI editors, such as
Intellij, won't be able to use Git commit because the hook fails trying
to look for the `pre-commit` binary in PATH.

This patch updates the hook template to use the hardcoded path to the
`pre-commit` binary if it was found, fallback to using the one from
PATH.

pkgs/development/python-modules/pre-commit/default.nix

@@ -7,6 +7,7 @@
 , importlib-metadata
 , importlib-resources
 , nodeenv
+, python
 , six
 , toml
 , virtualenv
@@ -22,6 +23,10 @@ buildPythonApplication rec {
     sha256 = "0l5qg1cw4a0670m96s0ryy5mqz5aslfrrnwpriqgmrnsgdixhj4g";
   };
 
+  patches = [
+    ./hook-tmpl-use-the-hardcoded-path-to-pre-commit.patch
+  ];
+
   propagatedBuildInputs = [
     aspy-yaml
     cached-property
@@ -38,6 +43,11 @@ buildPythonApplication rec {
   # slow and impure
   doCheck = false;
 
+  preFixup = ''
+    substituteInPlace $out/${python.sitePackages}/pre_commit/resources/hook-tmpl \
+      --subst-var-by pre-commit $out
+  '';
+
   meta = with lib; {
     description = "A framework for managing and maintaining multi-language pre-commit hooks";
     homepage = https://pre-commit.com/;