dinit: fix user spawn handling in chroot

dinit/hooks/dinit-user-spawn-install.hook

@@ -0,0 +1,11 @@
+[Trigger]
+Type = Path
+Operation = Install
+# Operation = Upgrade
+Target = usr/lib/dinit.d/dinit-user-spawn
+
+[Action]
+Description = Enabling dinit user spawn ...
+When = PostTransaction
+Exec = /usr/share/libalpm/scripts/dinit-hook userspawnE
+NeedsTargets

dinit/hooks/dinit-user-spawn-remove.hook

@@ -0,0 +1,10 @@
+[Trigger]
+Type = Path
+Operation = Remove
+Target = usr/lib/dinit.d/dinit-user-spawn
+
+[Action]
+Description = Disabling dinit user service help ...
+When = PostTransaction
+Exec = /usr/share/libalpm/scripts/dinit-hook userspawnD
+NeedsTargets

dinit/scripts/dinit-hook

@@ -54,6 +54,15 @@ restart_service() {
     fi
 }
 
+handle_user_spawn() {
+    if [ ! -S /run/dinitctl ]; then
+        echo >&2 "  Current root is not booted."
+        dinitctl "$1" -o dinit-user-spawn
+    else
+        dinitctl "$1" dinit-user-spawn
+    fi
+}
+
 op="$1"; shift
 
 case $op in
@@ -66,6 +75,8 @@ case $op in
   del)      svc_del_help ;;
   addU)      svc_user_add_help ;;
   delU)      svc_user_del_help ;;
+  userspawnE) handle_user_spawn enable ;;
+  userspawnD) handle_user_spawn disable ;;
   *) echo >&2 "  Invalid operation '$op'"; exit 1 ;;
 esac