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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 <stdio.h>
#include <stdlib.h>
#include <libubox/ulog.h>
#include "libfstools/libfstools.h"
#include "libfstools/volume.h"
/*
* Called in the early (PREINIT) stage, when we immediately need some writable
* filesystem.
*/
static int
start(int argc, char *argv[1])
{
struct volume *root;
struct volume *data = volume_find("rootfs_data");
if (!getenv("PREINIT"))
return -1;
if (!data) {
root = volume_find("rootfs");
volume_init(root);
ULOG_NOTE("mounting /dev/root\n");
mount("/dev/root", "/", NULL, MS_NOATIME | MS_REMOUNT, 0);
}
/*
* Before trying to mount and use "rootfs_data" let's check if there is
* extroot configured. Following call will handle reading config from
* the "rootfs_data" on its own.
*/
extroot_prefix = "";
if (!mount_extroot()) {
ULOG_NOTE("switched to extroot\n");
return 0;
}
/* There isn't extroot, so just try to mount "rootfs_data" */
switch (volume_identify(data)) {
case FS_NONE:
ULOG_WARN("no usable overlay filesystem found, using tmpfs overlay\n");
return ramoverlay();
case FS_DEADCODE:
/*
* Filesystem isn't ready yet and we are in the preinit, so we
* can't afford waiting for it. Use tmpfs for now and handle it
* properly in the "done" call.
*/
ULOG_NOTE("jffs2 not ready yet, using temporary tmpfs overlay\n");
return ramoverlay();
case FS_JFFS2:
case FS_UBIFS:
mount_overlay(data);
break;
case FS_SNAPSHOT:
mount_snapshot(data);
break;
}
return 0;
}
static int
stop(int argc, char *argv[1])
{
if (!getenv("SHUTDOWN"))
return -1;
return 0;
}
/*
* Called at the end of init, it can wait for filesystem if needed.
*/
static int
done(int argc, char *argv[1])
{
struct volume *v = volume_find("rootfs_data");
if (!v)
return -1;
switch (volume_identify(v)) {
case FS_NONE:
case FS_DEADCODE:
return jffs2_switch(v);
case FS_JFFS2:
case FS_UBIFS:
fs_state_set("/overlay", FS_STATE_READY);
break;
}
return 0;
}
int main(int argc, char **argv)
{
if (argc < 2)
return start(argc, argv);
if (!strcmp(argv[1], "ram"))
return ramoverlay();
if (!strcmp(argv[1], "stop"))
return stop(argc, argv);
if (!strcmp(argv[1], "done"))
return done(argc, argv);
return -1;
}
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