dinit: handle user spawn 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

@@ -66,6 +66,20 @@ case $op in
   del)      svc_del_help ;;
   addU)      svc_user_add_help ;;
   delU)      svc_user_del_help ;;
+  userspawnE)
+    if dinit_live; then
+        /usr/bin/dinitctl enable dinit-user-spawn
+    else
+        /usr/bin/dinitctl enable -o dinit-user-spawn
+    fi
+  ;;
+  userspawnD)
+    if dinit_live; then
+        /usr/bin/dinitctl disable dinit-user-spawn
+    else
+        /usr/bin/dinitctl disable -o dinit-user-spawn
+    fi
+  ;;
   *) echo >&2 "  Invalid operation '$op'"; exit 1 ;;
 esac