adds helpers and packages for pinentry

hosts/dnsc-air/default.nix

@@ -102,6 +102,8 @@
       "openjph"
       "p11-kit"
       "mas"
+      "gpg"
+      "pinentry-mac"
       "go"
       {
         name = "emacs-plus";

modules/fish/default.nix

@@ -52,6 +52,29 @@
       vterm_printf = ''
         printf "\e]%s\e\\" "$argv"
       '';
+      setup_gpg = ''
+    set -x GPG_TTY (tty)
+
+    if not test -d $HOME/.gnupg
+        mkdir -p $HOME/.gnupg
+        chmod 700 $HOME/.gnupg
+    end
+
+    set pinentry_line "pinentry-program "(which pinentry-mac)
+    if test -f $HOME/.gnupg/gpg-agent.conf
+        if not grep -Fxq $pinentry_line $HOME/.gnupg/gpg-agent.conf
+            echo $pinentry_line >> $HOME/.gnupg/gpg-agent.conf
+        end
+    else
+        echo $pinentry_line > $HOME/.gnupg/gpg-agent.conf
+    end
+
+    if pgrep gpg-agent > /dev/null
+        killall gpg-agent
+    end
+
+    echo "gpg + pinentry-mac installed and configured."
+      '';
     };
 
     interactiveShellInit = ''
@@ -60,6 +83,8 @@
       set hn (prompt_hostname)
       set fish_cursor_default     block      blink
 
+      set -x GPG_TTY (tty)
+
       if test "$INSIDE_EMACS" != "vterm"
           set fish_cursor_insert      line       blink
           set fish_cursor_replace_one underscore blink