From 9479cb5611f0d70754bc3c6f0756bcb9f21585f6 Mon Sep 17 00:00:00 2001
From: nikhil <asdfasdf5790@gmail.com>
Date: Wed, 11 Dec 2024 18:48:37 +0530
Subject: [PATCH 1/2] install: allow customization of shellHook

---
 home-manager/install.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/home-manager/install.nix b/home-manager/install.nix
index 2dfef324e..63e63dc9a 100644
--- a/home-manager/install.nix
+++ b/home-manager/install.nix
@@ -1,4 +1,6 @@
-{ home-manager, runCommand }:
+{ home-manager, runCommand
+, shellHook ? "exec ${home-manager}/bin/home-manager init --switch --no-flake"
+}:
 
 let
 
@@ -12,7 +14,7 @@ in runCommand "home-manager-install" {
   propagatedBuildInputs = [ home-manager ];
   preferLocalBuild = true;
   shellHookOnly = true;
-  shellHook = "exec ${home-manager}/bin/home-manager init --switch --no-flake";
+  inherit shellHook;
 } ''
   ${hmBashLibInit}
   _iError 'This derivation is not buildable, please run it using nix-shell.'

From 2ef5a65b38774d616ff54cf0a509c2714f0eb7a9 Mon Sep 17 00:00:00 2001
From: nikhil <asdfasdf5790@gmail.com>
Date: Wed, 11 Dec 2024 22:27:44 +0530
Subject: [PATCH 2/2] install: add integration test with preexisting dotfile

---
 .../standalone/alice-home-dotprofile.nix          | 15 +++++++++++++++
 tests/integration/standalone/override-install.nix |  6 ++++++
 tests/integration/standalone/standard-basics.nix  | 10 ++++++++++
 3 files changed, 31 insertions(+)
 create mode 100644 tests/integration/standalone/alice-home-dotprofile.nix
 create mode 100644 tests/integration/standalone/override-install.nix

diff --git a/tests/integration/standalone/alice-home-dotprofile.nix b/tests/integration/standalone/alice-home-dotprofile.nix
new file mode 100644
index 000000000..8759dccce
--- /dev/null
+++ b/tests/integration/standalone/alice-home-dotprofile.nix
@@ -0,0 +1,15 @@
+{ config, pkgs, ... }:
+
+{
+  home.username = "alice";
+  home.homeDirectory = "/home/alice";
+  home.stateVersion = "24.11";
+  programs.home-manager.enable = true;
+
+  # Write .profile
+  home.file = {
+    ".profile".text = ''
+      echo sourcing dotprofile
+    '';
+  };
+}
diff --git a/tests/integration/standalone/override-install.nix b/tests/integration/standalone/override-install.nix
new file mode 100644
index 000000000..5eb4ebf1c
--- /dev/null
+++ b/tests/integration/standalone/override-install.nix
@@ -0,0 +1,6 @@
+{ hmInstall ? (import <home-manager> { }).install }:
+hmInstall.override {
+  shellHook = ''
+    exec home-manager init --switch --no-flake -b backup
+  '';
+}
diff --git a/tests/integration/standalone/standard-basics.nix b/tests/integration/standalone/standard-basics.nix
index a3efb0411..234ff0cb4 100644
--- a/tests/integration/standalone/standard-basics.nix
+++ b/tests/integration/standalone/standard-basics.nix
@@ -122,6 +122,16 @@
       machine.succeed("test ! -e /home/alice/.local/state/home-manager")
       machine.succeed("test ! -e /home/alice/.local/state/nix/profiles/home-manager")
 
+    with subtest("Home Manager Installation with preexisting dotfile"):
+      succeed_as_alice("touch /home/alice/.profile")
+
+      succeed_as_alice("cp ${
+        ./alice-home-dotprofile.nix
+      } /home/alice/.config/home-manager/home.nix")
+
+      succeed_as_alice("nix-shell ${./override-install.nix}")
+      succeed_as_alice("test -e /home/alice/.profile.backup")
+
     logout_alice()
   '';
 }