export: use su-exec when sudo is absent

Signed-off-by: Luca Di Maio <[email protected]>

distrobox-export

@@ -217,10 +217,18 @@ if [ -z "${container_name}" ]; then
 fi
 
 #
-if [ "${is_sudo}" -ne 0 ]; then
-	start_shell="$(command -v sudo) -i"
-else
-	start_shell="$(command -v sudo) -u ${USER} -i"
+if command -v su-exec 2> /dev/null; then
+	if [ "${is_sudo}" -ne 0 ]; then
+		start_shell="su-exec root su - root -c"
+	else
+		start_shell="su-exec root su - ${USER} -c"
+	fi
+elif command -v sudo 2> /dev/null; then
+	if [ "${is_sudo}" -ne 0 ]; then
+		start_shell="$(command -v sudo) -i"
+	else
+		start_shell="$(command -v sudo) -u ${USER} -i"
+	fi
 fi
 
 # Prefix to add to an existing command to work through the container