fix(sddm): set Backgrounds/default as primary and update fallbacks; detect themes dir (incl. NixOS) and skip prompt on read-only paths

- Prefer Backgrounds/default for simple_sddm_2; update default.jpg/png if present
- Detect SDDM themes dir under /usr/share and /run/current-system
- Avoid prompting when theme is missing or Backgrounds is not writable (e.g., NixOS)
- Skip runtime changes on NixOS since SDDM isn’t used in that config

1 files changed, 17 insertions, 5 deletions

diff --git a/config/hypr/UserScripts/WallpaperSelect.sh b/config/hypr/UserScripts/WallpaperSelect.sh
index a08b53ce..466832ba 100755
--- a/config/hypr/UserScripts/WallpaperSelect.sh
+++ b/config/hypr/UserScripts/WallpaperSelect.sh
@@ -101,9 +101,21 @@ menu() {
 # Offer SDDM Simple Wallpaper Option (only for non-video wallpapers)
 set_sddm_wallpaper() {
   sleep 1
-  sddm_simple="/usr/share/sddm/themes/simple_sddm_2"
 
-  if [ -d "$sddm_simple" ]; then
+  # Resolve SDDM themes directory (standard and NixOS path)
+  local sddm_themes_dir=""
+  if [ -d "/usr/share/sddm/themes" ]; then
+    sddm_themes_dir="/usr/share/sddm/themes"
+  elif [ -d "/run/current-system/sw/share/sddm/themes" ]; then
+    sddm_themes_dir="/run/current-system/sw/share/sddm/themes"
+  fi
+
+  [ -z "$sddm_themes_dir" ] && return 0
+
+  local sddm_simple="$sddm_themes_dir/simple_sddm_2"
+
+  # Only prompt if theme exists and its Backgrounds directory is writable
+  if [ -d "$sddm_simple" ] && [ -w "$sddm_simple/Backgrounds" ]; then
 
     # Check if yad is running to avoid multiple notifications
     if pidof yad >/dev/null; then
@@ -123,9 +135,9 @@ set_sddm_wallpaper() {
         notify-send -i "$iDIR/error.png" "Missing $terminal" "Install $terminal to enable setting of wallpaper background"
         exit 1
       fi
-	  
-	  exec $SCRIPTSDIR/sddm_wallpaper.sh --normal
-    
+
+      exec "$SCRIPTSDIR/sddm_wallpaper.sh" --normal
+
     fi
   fi
 }