Take a system snapshot before upgrading to quattro

bin/omarchy-upgrade-to-quattro

@@ -475,6 +475,10 @@ configure_snapper_policy() {
   as_root env OMARCHY_PATH=/usr/share/omarchy bash -euo pipefail "$snapper_config_script"
 }
 
+create_pre_upgrade_snapshot() {
+  omarchy-snapshot create || (($? == 127))
+}
+
 remove_conflicting_legacy_packages() {
   # Remove legacy packages that are known to conflict with Omarchy quattro defaults
   # before the main package transaction. Broader retired-package cleanup runs
@@ -2237,6 +2241,7 @@ refresh_current_theme_after_upgrade() {
     omarchy-restart-terminal >/dev/null 2>&1 || true
 }
 
+create_pre_upgrade_snapshot
 configure_pacman_channel
 install_keyrings
 remove_legacy_installer_package

test/shell.d/upgrade-to-quattro-test.sh

@@ -7,6 +7,13 @@ source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
 upgrade_to_quattro="$ROOT/bin/omarchy-upgrade-to-quattro"
 first_run_wifi="$ROOT/install/user/first-run/wifi.sh"
 
+snapshot_line=$(grep -n '^create_pre_upgrade_snapshot$' "$upgrade_to_quattro" | cut -d: -f1)
+pacman_line=$(grep -n '^configure_pacman_channel$' "$upgrade_to_quattro" | cut -d: -f1)
+[[ -n $snapshot_line && -n $pacman_line ]] || fail "upgrade snapshot and first mutation calls exist"
+(( snapshot_line < pacman_line )) || fail "upgrade snapshot runs before pacman configuration"
+grep -F 'omarchy-snapshot create || (($? == 127))' "$upgrade_to_quattro" >/dev/null
+pass "Omarchy 4 upgrade snapshots the system before mutation"
+
 grep -F 'pacman -Syu --needed' "$upgrade_to_quattro" >/dev/null
 grep -F 'omarchy-update-aur-pkgs' "$upgrade_to_quattro" >/dev/null
 grep -F 'omarchy-update-available' "$upgrade_to_quattro" >/dev/null