Change the format command to always take the mount point as an argument.

//    if fs_size == 0, then make_ext4fs uses the entire partition.

//    if fs_size > 0, that is the size to use

//    if fs_size < 0, then reserve that many bytes at the end of the partition

//    mount_point is used with SELinux as the location of the mount point, absent otherwise

Value* FormatFn(const char* name, State* state, int argc, Expr* argv[]) {

    char* result = NULL;

    if (argc != 4 && argc != 5) {

        return ErrorAbort(state, "%s() expects 4 or 5 args, got %d", name, argc);

    if (argc != 5) {

        return ErrorAbort(state, "%s() expects 5 args, got %d", name, argc);

    }

    char* fs_type;

    char* partition_type;

    char* location;

    char* fs_size;

    char* mount_point = NULL;

    char* mount_point;

#ifdef HAVE_SELINUX

    if (ReadArgs(state, argv, 5, &fs_type, &partition_type, &location, &fs_size, &mount_point) < 0) {

        return NULL;

    }

#else

    if (ReadArgs(state, argv, 4, &fs_type, &partition_type, &location, &fs_size) < 0) {

        return NULL;

    }

#endif

    if (strlen(fs_type) == 0) {

        ErrorAbort(state, "fs_type argument to %s() can't be empty", name);

        goto done;

    }

#ifdef HAVE_SELINUX

    if (!mount_point || strlen(mount_point) == 0) {

    if (strlen(mount_point) == 0) {

        ErrorAbort(state, "mount_point argument to %s() can't be empty", name);

        goto done;

    }

#endif

    if (strcmp(partition_type, "MTD") == 0) {

        mtd_scan_partitions();