Add rbw SSH socket support in home-manager modules

- Introduced a new module `rbw-ssh-socket.nix` to manage SSH_AUTH_SOCK for rbw.
- Updated `default.nix` to utilize the new SSH socket variable for session management.
- Refactored Bash and Fish shell configurations to use the new module for setting SSH_AUTH_SOCK, improving maintainability and consistency across shell environments.

modules/lib/rbw-ssh-socket.nix

@@ -0,0 +1,30 @@
+{ ... }: {
+  flake.lib.rbwSshSocket =
+    let
+      bashSnippet = ''
+        if [ -z "''${SSH_AUTH_SOCK:-}" ]; then
+          if [ -n "''${XDG_RUNTIME_DIR:-}" ]; then
+            export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/rbw/ssh-agent-socket"
+          else
+            export SSH_AUTH_SOCK="/run/user/$(id -u)/rbw/ssh-agent-socket"
+          fi
+        fi
+      '';
+      fishSnippet =
+        pkgs: ''
+          if test -z "$SSH_AUTH_SOCK"
+            if test -n "$XDG_RUNTIME_DIR"
+              set -gx SSH_AUTH_SOCK "$XDG_RUNTIME_DIR/rbw/ssh-agent-socket"
+            else
+              set -l _hm_uid (${pkgs.coreutils}/bin/id -u)
+              set -gx SSH_AUTH_SOCK "/run/user/$_hm_uid/rbw/ssh-agent-socket"
+            end
+          end
+        '';
+    in
+    {
+      inherit bashSnippet fishSnippet;
+      sessionVariable = "$XDG_RUNTIME_DIR/rbw/ssh-agent-socket";
+      activationPath = "/run/user/$(id -u)/rbw/ssh-agent-socket";
+    };
+}

modules/ssh/home-manager/default.nix

@@ -56,14 +56,14 @@
       }
       {
         home.packages = with pkgs; [ rbw pinentry-gtk2 ];
-        home.sessionVariables.SSH_AUTH_SOCK = "$XDG_RUNTIME_DIR/rbw/ssh-agent-socket";
+        home.sessionVariables.SSH_AUTH_SOCK = self.lib.rbwSshSocket.sessionVariable;
         home.file = inventory.mkIdentityFiles selectedHosts;
 
         programs.ssh.enable = lib.mkIf cfg.manageSshConfig false;
         home.activation.rbwSshConfig = lib.mkIf cfg.manageSshConfig (lib.hm.dag.entryAfter [ "writeBoundary" ] ''
           mkdir -p "$HOME/.ssh"
           chmod 700 "$HOME/.ssh"
-          RBW_SSH_SOCK="/run/user/$(id -u)/rbw/ssh-agent-socket"
+          RBW_SSH_SOCK="${self.lib.rbwSshSocket.activationPath}"
           cat > "$HOME/.ssh/config" <<'EOF'
 ${sshConfigTemplate}
 EOF

modules/wisdom/shells/bash.nix

@@ -1,9 +1,10 @@
-{ ... }: {
+{ self, ... }: {
   flake.homeManagerModules.wisdomShellBash =
     { config, lib, ... }:
     let
       root = config.chiasson.home;
       cfg = config.chiasson.home.shell.bash;
+      rbw = self.lib.rbwSshSocket;
     in
     {
       options.chiasson.home.shell.bash.enable = lib.mkEnableOption "Bash + rbw SSH socket env in profile/init." // {
@@ -13,24 +14,8 @@
       config = lib.mkIf (root.enable && cfg.enable) {
         programs.bash = {
           enable = true;
-          profileExtra = ''
+          profileExtra = rbw.bashSnippet;
-            if [ -z "''${SSH_AUTH_SOCK:-}" ]; then
+          initExtra = rbw.bashSnippet;
-              if [ -n "''${XDG_RUNTIME_DIR:-}" ]; then
-                export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/rbw/ssh-agent-socket"
-              else
-                export SSH_AUTH_SOCK="/run/user/$(id -u)/rbw/ssh-agent-socket"
-              fi
-            fi
-          '';
-          initExtra = ''
-            if [ -z "''${SSH_AUTH_SOCK:-}" ]; then
-              if [ -n "''${XDG_RUNTIME_DIR:-}" ]; then
-                export SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/rbw/ssh-agent-socket"
-              else
-                export SSH_AUTH_SOCK="/run/user/$(id -u)/rbw/ssh-agent-socket"
-              fi
-            fi
-          '';
         };
       };
     };

modules/wisdom/shells/fish.nix

@@ -1,9 +1,10 @@
-{ ... }: {
+{ self, ... }: {
   flake.homeManagerModules.wisdomShellFish =
     { config, lib, pkgs, ... }:
     let
       root = config.chiasson.home;
       cfg = config.chiasson.home.shell.fish;
+      rbw = self.lib.rbwSshSocket;
     in
     {
       options.chiasson.home.shell.fish = {
@@ -19,21 +20,13 @@
       };
 
       config = lib.mkIf (root.enable && cfg.enable) {
-        # `fishPlugins.grc` only installs the plugin; the wrapper invokes the `grc` binary.
         home.packages = [ pkgs.grc ];
 
         programs.fish = {
           enable = true;
           interactiveShellInit = ''
             set fish_greeting ""
-            if test -z "$SSH_AUTH_SOCK"
+            ${rbw.fishSnippet pkgs}
-              if test -n "$XDG_RUNTIME_DIR"
-                set -gx SSH_AUTH_SOCK "$XDG_RUNTIME_DIR/rbw/ssh-agent-socket"
-              else
-                set -l _hm_uid (${pkgs.coreutils}/bin/id -u)
-                set -gx SSH_AUTH_SOCK "/run/user/$_hm_uid/rbw/ssh-agent-socket"
-              end
-            end
           '';
           plugins = [
             {