detect-ext4.c

/*
 *  Fix the filesystem detection in the Linux Dropbox client
 *  Copyright (C) 2018  Marco Leogrande
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <linux/magic.h>
#include <sys/stat.h>
#include <sys/vfs.h>

int main(void) {
  struct statfs64 buf;

  if (statfs64(".", &buf) == -1) {
      perror("statfs64");
      exit(1);
  }

  if (buf.f_type != EXT4_SUPER_MAGIC) {
      fprintf(stderr, "failure: Different filesystem type detected.\n");
      exit(1);
  }

  printf("success: It appears like we're on ext4.\n");
  exit(0);
}