gitSetupHook: init (#402320)

nixos/doc/manual/release-notes/rl-2505.section.md

···
 
 - A toggle has been added under `users.users.<name>.enable` to allow toggling individual users conditionally. If set to false, the user account will not be created.
 
+- New hooks were added:
+  - `writableTmpDirAsHomeHook`: This setup hook ensures that the directory specified by the `HOME` environment variable is writable.
+  - `addBinToPathHook`: This setup hook checks if the `bin/` directory exists in the `$out` output path and, if so, adds it to the `PATH` environment variable.
+  - `gitSetupHook`: This setup hook sets up a valid Git configuration, including the `user.name` and `user.email` fields.
+
 <!-- To avoid merge conflicts, consider adding your item at an arbitrary place in the list instead. -->
 
 ## NixOS Wiki {#sec-release-25.05-wiki}

pkgs/by-name/gi/gitSetupHook/gitSetupHook.sh

···
+# shellcheck shell=bash
+
+gitSetup () {
+    GIT_CONFIG_GLOBAL=$(mktemp -t gitconfig.XXXXXX)
+    export GIT_CONFIG_GLOBAL
+    @gitMinimal@ config --global user.name GitSetupHook
+    @gitMinimal@ config --global user.email [e-mail]
+}
+
+postHooks+=(gitSetup)

pkgs/by-name/gi/gitSetupHook/package.nix

···
+{
+  lib,
+  gitMinimal,
+  makeSetupHook,
+}:
+
+makeSetupHook {
+  name = "gitSetupHook";
+
+  substitutions = {
+    gitMinimal = lib.getExe gitMinimal;
+  };
+
+} ./gitSetupHook.sh