Improve shebang detection

.templates/ha_entrypoint.sh

@@ -9,11 +9,22 @@ echo "Starting..."
 for SCRIPTS in /etc/cont-init.d/*; do
     [ -e "$SCRIPTS" ] || continue
     echo "$SCRIPTS: executing"
+    
+    # Ensure permissions
     chown "$(id -u)":"$(id -g)" "$SCRIPTS"
     chmod a+x "$SCRIPTS"
-    # Change shebang if no s6 supervision
-    sed -i 's|/usr/bin/with-contenv bashio|/usr/bin/env bashio|g' "$SCRIPTS"
-    /usr/bin/env bashio "$SCRIPTS" || echo -e "\033[0;31mError\033[0m : $SCRIPTS exiting $?"
+
+    # Get current shebang, if not available use another
+    currentshebang="$(sed -n '1{s/^#![[:blank:]]*//p;q}' "$SCRIPTS")"
+    if [ ! -f "${currentshebang%% *}" ]; then
+        for shebang in "/command/with-contenv bashio" "/usr/bin/env bashio" "/usr/bin/bashio" "/bin/bash" "/bin/sh"; do if [ -f "${shebang%% *}" ]; then break; fi; done
+        sed -i "s|$currentshebang|$shebang|g" "$SCRIPTS"
+    fi
+    
+    # Start the script
+    /./ "$SCRIPTS" || echo -e "\033[0;31mError\033[0m : $SCRIPTS exiting $?"
+
+    # Cleanup
     rm "$SCRIPTS"
 done