Add always-on ~/.bash_profile bootstrap for login shells

NixOS and most other Linux distros don't ship a ~/.bash_profile that
sources ~/.bashrc, so login shells miss the user's bash config. Adds a
home-manager activation script that creates one only when absent, on
every platform, without ever touching a pre-existing .bash_profile.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BBSd4VBfoKHjE1HR3P8kmn

1 files changed, 21 insertions, 0 deletions

diff --git a/modules/home/bash-profile.nix b/modules/home/bash-profile.nix
new file mode 100644
index 0000000..30114ba
--- /dev/null
+++ b/modules/home/bash-profile.nix
@@ -0,0 +1,21 @@
+{ config, lib, pkgs, ... }:
+let
+  bashProfileContent = pkgs.writeText "bash_profile" ''
+    # Written once by home-manager (modules/home/bash-profile.nix) so login
+    # shells actually source ~/.bashrc — NixOS and other Linux distros don't
+    # ship a ~/.bash_profile that does this by default. Only created if it
+    # didn't already exist; home-manager never touches it again after that,
+    # so it's yours to edit.
+    if [ -f "$HOME/.bashrc" ]; then
+      . "$HOME/.bashrc"
+    fi
+  '';
+in
+{
+  home.activation.bashProfile = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
+    BASH_PROFILE=${lib.escapeShellArg "${config.home.homeDirectory}/.bash_profile"}
+    if [ ! -e "$BASH_PROFILE" ]; then
+      $DRY_RUN_CMD ${pkgs.coreutils}/bin/install -m 644 ${bashProfileContent} "$BASH_PROFILE"
+    fi
+  '';
+}