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jffs2reset.c
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jffs2reset.c
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/*
* Copyright (C) 2014 John Crispin <blogic@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* 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.
*/
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/reboot.h>
#include <libubox/ulog.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include "libfstools/libfstools.h"
#include "libfstools/volume.h"
static int jffs2_mark(struct volume *v);
static int
ask_user(void)
{
ULOG_WARN("This will erase all settings and remove any installed packages. Are you sure? [N/y]\n");
if (getchar() != 'y')
return -1;
return 0;
}
static int jffs2_reset(struct volume *v, int reset)
{
char *mp;
mp = find_mount_point(v->blk, 1);
if (mp) {
ULOG_INFO("%s is mounted as %s, only erasing files\n", v->blk, mp);
fs_state_set("/overlay", FS_STATE_PENDING);
overlay_delete(mp, false);
mount(mp, "/", NULL, MS_REMOUNT, 0);
} else {
ULOG_INFO("%s is not mounted\n", v->blk);
return jffs2_mark(v);
}
if (reset) {
sync();
sleep(2);
reboot(RB_AUTOBOOT);
while (1)
;
}
return 0;
}
static int jffs2_mark(struct volume *v)
{
__u32 deadc0de = __cpu_to_be32(0xdeadc0de);
size_t sz;
int fd;
fd = open(v->blk, O_WRONLY);
ULOG_INFO("%s will be erased on next mount\n", v->blk);
if (!fd) {
ULOG_ERR("opening %s failed\n", v->blk);
return -1;
}
sz = write(fd, &deadc0de, sizeof(deadc0de));
close(fd);
if (sz != 4) {
ULOG_ERR("writing %s failed: %s\n", v->blk, strerror(errno));
return -1;
}
return 0;
}
int main(int argc, char **argv)
{
struct volume *v;
int ch, yes = 0, reset = 0;
while ((ch = getopt(argc, argv, "yr")) != -1) {
switch(ch) {
case 'y':
yes = 1;
break;
case 'r':
reset = 1;
break;
}
}
if (!yes && ask_user())
return -1;
/*
* TODO: Currently this only checks if kernel supports OverlayFS. We
* should check if there is a mount point using it with rootfs_data
* as upperdir.
*/
if (find_filesystem("overlay")) {
ULOG_ERR("overlayfs not supported by kernel\n");
return -1;
}
v = volume_find("rootfs_data");
if (!v) {
ULOG_ERR("MTD partition 'rootfs_data' not found\n");
return -1;
}
volume_init(v);
if (!strcmp(*argv, "jffs2mark"))
return jffs2_mark(v);
return jffs2_reset(v, reset);
}