From ffacecdce62a7a6cf24c8f2801f51bd5814f955e Mon Sep 17 00:00:00 2001
From: Mike Brady <4265913+mikebrady@users.noreply.github.com>
Date: Mon, 14 Apr 2025 09:30:53 +0100
Subject: [PATCH] Check that the existing user startup script is replaceable.

---
 user-service-install.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/user-service-install.sh b/user-service-install.sh
index 1d59f19e..4d09c937 100644
--- a/user-service-install.sh
+++ b/user-service-install.sh
@@ -117,6 +117,15 @@ if [ -d "$USER_SYSTEMD_DIR" ] && [ ! -w "$USER_SYSTEMD_DIR" ]; then
     exit 1
 fi
 
+
+# If the service file already exists, check that we can replace it
+
+if [ -f "$SERVICE_DEST" ] && [ ! -w "$SERVICE_DEST" ]; then
+    echo "[FAIL] The existing $SERVICE_DEST can not be replaced due to its ownership or permissions." >&2
+    echo "  [ADVICE] Please delete $SERVICE_DEST or ensure it is owned and writable by user \"$(whoami)\" before proceeding." >&2
+    exit 1
+fi
+
 # Create the service file
 
 if [ "$DRY_RUN" -eq 0 ]; then