feat: --defaults --options <ids> (exactly these on) replaces --skip; steamify.sh --boot gamescope|desktop on its own switches where an installed conversion starts

steamify.sh

@@ -28,11 +28,15 @@ require_root_helper
 
 BACKEND=false
 [[ "${1:-}" == --backend ]] && BACKEND=true
-# --defaults [--skip <id>,...] [--boot gamescope|desktop]: apply what the
-# menu would preselect (minus the skipped items), without the menu or any
+# --defaults [--options <id>,...] [--boot gamescope|desktop]: apply what the
+# menu would preselect (or exactly the listed items), without the menu or any
 # prompt (the Steam Machine ISO's first login runs this; sudo must not ask).
 DEFAULTS=false
 [[ "${1:-}" == --defaults ]] && DEFAULTS=true
+# --boot gamescope|desktop: only change where an installed conversion
+# starts, everything else stays as it is (for scripts; no menu).
+BOOT_ONLY=false
+[[ "${1:-}" == --boot ]] && BOOT_ONLY=true
 
 if [[ "$BACKEND" == false ]]; then
     echo -e "${c_bold}Steamify CachyOS${c_reset} v$VERSION"
@@ -139,6 +143,30 @@ if [[ "$DEFAULTS" == true ]]; then
     exit 0
 fi
 
+if [[ "$BOOT_ONLY" == true ]]; then
+    RESTART_FOR_LOGIN=false
+    REAPPLY=false
+    case "${2:-}" in
+        gamescope|desktop) ;;
+        *) err "--boot takes gamescope or desktop"; exit 1 ;;
+    esac
+    detect_components
+    [[ "${CURRENT[gaming]}" == 1 ]] || { err "--boot needs the SteamOS conversion; turn it on first."; exit 1; }
+    # What is on stays on, and nothing else changes: not the updates or
+    # removals a normal run would pick.
+    for c in "${COMPONENTS[@]}"; do WANTED[$c]=${CURRENT[$c]:-0}; done
+    WANTED[boot]=0; [[ "$2" == desktop ]] && WANTED[boot]=1
+    plan_changes
+    if [[ ${#TO_DISABLE[@]} -eq 0 && ${#TO_ENABLE[@]} -eq 0 ]]; then
+        ok "Already starting in $2."
+        exit 0
+    fi
+    apply_changes
+    [[ ${#FAILED[@]} -eq 0 ]] || { warn "These had problems (see above): ${FAILED[*]}"; exit 1; }
+    ok "Starts in $2 from the next boot on."
+    exit 0
+fi
+
 # Menu loop: after each run the menu comes back with the new state, until
 # the user quits; the restart question comes then, once, for everything.
 RESTART_FOR_LOGIN=false