zsh: optimize gpg-agent initialization

.config/dotfiles/gitignore

@@ -4,9 +4,11 @@
 !/.cache/zsh/compzwc/.keep
 !/.cache/zsh/ssh/.keep
 !/.config/dotfiles/bin/.keep
+!/.config/dotfiles/debian.sources
 !/.config/dotfiles/gen-gitignore.sh
 !/.config/dotfiles/gitattributes
 !/.config/dotfiles/gitignore
+!/.config/dotfiles/gitignore.vcs
 !/.config/dotfiles/install.sh
 !/.config/dotfiles/scripts/.keep
 !/.config/dotfiles/woodpecker.yml

.config/dotfiles/gitignore.vcs

@@ -0,0 +1,18 @@
+!/.cache/zsh/compcache/.keep
+!/.cache/zsh/completion/.keep
+!/.cache/zsh/compzwc/.keep
+!/.cache/zsh/ssh/.keep
+!/.config/zsh/local/.keep
+!/.config/zsh/local/completion/.keep
+!/.config/zsh/local/env.zsh.example
+!/.config/zsh/var/.keep
+
+/.cache/zsh/compcache/*
+/.cache/zsh/compdump
+/.cache/zsh/completion/*
+/.cache/zsh/compzwc/*
+/.cache/zsh/ssh/*
+/.config/zsh/**/*.zwc
+/.config/zsh/local.zsh
+/.config/zsh/local/*
+/.config/zsh/var/*

.config/zsh/rc/gpg-agent.zsh

@@ -6,12 +6,17 @@ z-gpg-agent() {
 
     (( ${+commands[gpg-agent]} )) || return 127
 
-    local u
-    for u in gpg-agent.{service,socket} ; do
-        z-systemctl-exists --user $u || continue
-
-        z-systemctl --user --now enable $u
-    done
+    if (( ${+commands[systemctl]} )) ; then
+        local u s
+        for u in gpg-agent.{service,socket} ; do
+            s=$(z-systemctl --user is-enabled $u)
+            case "$s" in
+            disabled ) ;;
+            * ) continue ;;
+            esac
+            z-systemctl --user --now enable $u
+        done
+    fi
 
     (( ${+commands[gpgconf]} )) || return 127