refactor: The session sync and kernel headers scripts in patches/

patches/sync-steamos-session.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+SRC="/etc/plasmalogin.conf.d/zz-steamos-autologin.conf"
+DEST="/etc/plasmalogin.conf"
+
+[[ -f "$SRC" ]] || exit 0
+SESSION=$(grep -oP '^Session=\K.*' "$SRC")
+[[ -z "$SESSION" ]] && exit 0
+
+# Only touch Session= inside [Autologin]; other sections may have their own.
+if sed -n '/^\[Autologin\]/,/^\[/p' "$DEST" | grep -q '^Session='; then
+    sed -i "/^\[Autologin\]/,/^\[/ s|^Session=.*|Session=$SESSION|" "$DEST"
+elif grep -q '^\[Autologin\]' "$DEST"; then
+    sed -i "/^\[Autologin\]/a Session=$SESSION" "$DEST"
+else
+    printf '\n[Autologin]\nSession=%s\n' "$SESSION" >> "$DEST"
+fi