From 6daa866beb4d1e26a8b2579a596e669831f7a94f Mon Sep 17 00:00:00 2001
From: Mihai Fufezan <fufexan@protonmail.com>
Date: Thu, 2 Jun 2022 00:08:03 +0300
Subject: [PATCH] nix/updater: only update wlroots on rev change

---
 nix/update-inputs.sh | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/nix/update-inputs.sh b/nix/update-inputs.sh
index fd3c248b..d0418d65 100755
--- a/nix/update-inputs.sh
+++ b/nix/update-inputs.sh
@@ -1,13 +1,19 @@
-#!/usr/bin/env -S nix shell nixpkgs#gawk nixpkgs#git nixpkgs#moreutils -c bash
-
-# get wlroots revision from submodule
-rev=$(git submodule status | awk '{ print substr($1,2)}')
+#!/usr/bin/env -S nix shell nixpkgs#gawk nixpkgs#git nixpkgs#moreutils nixpkgs#jq -c bash
 
 # update nixpkgs to latest version
 nix flake lock --update-input nixpkgs
 
-# update wlroots to submodule revision
-nix flake lock --override-input wlroots "gitlab:wlroots/wlroots/$rev?host=gitlab.freedesktop.org"
+# get wlroots revision from submodule
+SUB_REV=$(git submodule status | awk '{ print substr($1,2)}')
+# and from lockfile
+CRT_REV=$(jq < flake.lock '.nodes.wlroots.locked.rev' -r)
 
-# remove "dirty" mark from lockfile
-jq < flake.lock 'del(.nodes.wlroots.original.rev)' | sponge flake.lock
+if [ $SUB_REV != $CRT_REV ]; then
+  # update wlroots to submodule revision
+  nix flake lock --override-input wlroots "gitlab:wlroots/wlroots/$SUB_REV?host=gitlab.freedesktop.org"
+
+  # remove "dirty" mark from lockfile
+  jq < flake.lock 'del(.nodes.wlroots.original.rev)' | sponge flake.lock
+else
+  echo "wlroots is up to date!"
+fi