Update run.sh

run.sh

@@ -8,7 +8,9 @@ source /opt/idssys/ta-proxmenu/defaults.inc
 SWITCH_TO_V2() {
 	local repository='/opt/idssys/ta-proxmenu'
 	local current_branch
+	local head_commit
 	local local_commit
+	local main_commit
 	local remote_commit
 
 	if [[ ! -d "${repository}/.git" ]]; then
@@ -17,10 +19,6 @@ SWITCH_TO_V2() {
 	fi
 
 	current_branch="$(git -C "$repository" branch --show-current 2>/dev/null)"
-	if [[ -z "$current_branch" ]]; then
-		echo -e "${idsCL[Red]}TA-ProxMenu is in a detached HEAD state; branch switching was refused.${idsCL[Default]}"
-		return 1
-	fi
 	if [[ "$current_branch" == "V2" ]]; then
 		exec /opt/idssys/ta-proxmenu/run.sh
 	fi
@@ -32,11 +30,23 @@ SWITCH_TO_V2() {
 
 	echo -e "${idsCL[LightCyan]}Fetching TA-ProxMenu branch 'V2'...${idsCL[Default]}"
 	if ! timeout 30 git -C "$repository" fetch --prune origin \
+		'+refs/heads/main:refs/remotes/origin/main' \
 		'+refs/heads/V2:refs/remotes/origin/V2' >/dev/null 2>&1; then
 		echo -e "${idsCL[Red]}Could not fetch branch 'V2' from origin.${idsCL[Default]}"
 		return 1
 	fi
 
+	if [[ -z "$current_branch" ]]; then
+		head_commit="$(git -C "$repository" rev-parse --verify 'HEAD^{commit}' 2>/dev/null)"
+		main_commit="$(git -C "$repository" rev-parse --verify \
+			'refs/remotes/origin/main^{commit}' 2>/dev/null)"
+		if [[ -z "$head_commit" || "$head_commit" != "$main_commit" ]]; then
+			echo -e "${idsCL[Red]}TA-ProxMenu has an unrecognized detached HEAD; branch switching was refused.${idsCL[Default]}"
+			return 1
+		fi
+		echo -e "${idsCL[LightCyan]}Recovered the legacy updater's detached main checkout.${idsCL[Default]}"
+	fi
+
 	remote_commit="$(git -C "$repository" rev-parse --verify \
 		'refs/remotes/origin/V2^{commit}' 2>/dev/null)" || {
 		echo -e "${idsCL[Red]}Origin does not provide a usable V2 branch.${idsCL[Default]}"