+++ /dev/null
-/*
- * 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/stat.h>
-#include <sys/types.h>
-#include <sys/mount.h>
-
-#include <asm/byteorder.h>
-
-#include <errno.h>
-#include <string.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <glob.h>
-#include <errno.h>
-#include <dirent.h>
-#include <fcntl.h>
-
-#include "../fs-state.h"
-#include "../driver/volume.h"
-
-#define SWITCH_JFFS2 "/tmp/.switch_jffs2"
-
-void
-foreachdir(const char *dir, int (*cb)(const char*))
-{
- char globdir[256];
- glob_t gl;
- int j;
-
- if (dir[strlen(dir) - 1] == '/')
- snprintf(globdir, 256, "%s*", dir);
- else
- snprintf(globdir, 256, "%s/*", dir);
-
- if (!glob(globdir, GLOB_NOESCAPE | GLOB_MARK | GLOB_ONLYDIR, NULL, &gl))
- for (j = 0; j < gl.gl_pathc; j++)
- foreachdir(gl.gl_pathv[j], cb);
-
- cb(dir);
-}
-
-static int
-jffs2_mount(void)
-{
- struct volume *v;
-
- if (mkdir("/tmp/overlay", 0755)) {
- fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
- return -1;
- }
-
- v = volume_find("rootfs_data");
- if (!v) {
- fprintf(stderr, "rootfs_data does not exist\n");
- return -1;
- }
-
- if (mount(v->blk, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
- fprintf(stderr, "failed to mount -t jffs2 %s /tmp/overlay: %s\n", v->blk, strerror(errno));
- return -1;
- }
-
- return volume_init(v);
-}
-
-static int
-switch2jffs(void)
-{
- struct volume *v = volume_find("rootfs_data");
- struct stat s;
- int ret;
-
- if (!stat(SWITCH_JFFS2, &s)) {
- fprintf(stderr, "jffs2 switch already running\n");
- return -1;
- }
-
- if (!v) {
- fprintf(stderr, "no rootfs_data was found\n");
- return -1;
- }
-
- creat("/tmp/.switch_jffs2", 0600);
- ret = mount(v->blk, "/rom/overlay", "jffs2", MS_NOATIME, NULL);
- unlink("/tmp/.switch_jffs2");
- if (ret) {
- fprintf(stderr, "failed - mount -t jffs2 %s /rom/overlay: %s\n", v->blk, strerror(errno));
- return -1;
- }
-
- if (mount("none", "/", NULL, MS_NOATIME | MS_REMOUNT, 0)) {
- fprintf(stderr, "failed - mount -o remount,ro none: %s\n", strerror(errno));
- return -1;
- }
-
- system("cp -a /tmp/root/* /rom/overlay");
-
- if (pivot("/rom", "/mnt")) {
- fprintf(stderr, "failed - pivot /rom /mnt: %s\n", strerror(errno));
- return -1;
- }
-
- if (mount_move("/mnt", "/tmp/root", "")) {
- fprintf(stderr, "failed - mount -o move /mnt /tmp/root %s\n", strerror(errno));
- return -1;
- }
-
- return fopivot("/overlay", "/rom");
-}
-
-int
-handle_whiteout(const char *dir)
-{
- struct stat s;
- char link[256];
- ssize_t sz;
- struct dirent **namelist;
- int n;
-
- n = scandir(dir, &namelist, NULL, NULL);
-
- if (n < 1)
- return -1;
-
- while (n--) {
- char file[256];
-
- snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
- if (!lstat(file, &s) && S_ISLNK(s.st_mode)) {
- sz = readlink(file, link, sizeof(link) - 1);
- if (sz > 0) {
- char *orig;
-
- link[sz] = '\0';
- orig = strstr(&file[1], "/");
- if (orig && !strcmp(link, "(overlay-whiteout)"))
- unlink(orig);
- }
- }
- free(namelist[n]);
- }
- free(namelist);
-
- return 0;
-}
-
-static int
-ask_user(int argc, char **argv)
-{
- if ((argc < 2) || strcmp(argv[1], "-y")) {
- fprintf(stderr, "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
-handle_rmdir(const char *dir)
-{
- struct stat s;
- struct dirent **namelist;
- int n;
-
- n = scandir(dir, &namelist, NULL, NULL);
-
- if (n < 1)
- return -1;
-
- while (n--) {
- char file[256];
-
- snprintf(file, sizeof(file), "%s%s", dir, namelist[n]->d_name);
- if (!lstat(file, &s) && !S_ISDIR(s.st_mode))
- unlink(file);
- free(namelist[n]);
- }
- free(namelist);
-
- rmdir(dir);
-
- return 0;
-}
-
-static int
-jffs2_reset(int argc, char **argv)
-{
- struct volume *v;
- char *mp;
-
- if (ask_user(argc, argv))
- return -1;
-
- if (find_filesystem("overlay")) {
- fprintf(stderr, "overlayfs not found\n");
- return -1;
- }
-
- v = volume_find("rootfs_data");
- if (!v) {
- fprintf(stderr, "no rootfs_data was found\n");
- return -1;
- }
-
- mp = find_mount_point(v->blk, "jffs2");
- if (mp) {
- fprintf(stderr, "%s is mounted as %s, only erasing files\n", v->blk, mp);
- foreachdir(mp, handle_rmdir);
- mount(mp, "/", NULL, MS_REMOUNT, 0);
- } else {
- fprintf(stderr, "%s is not mounted, erasing it\n", v->blk);
- volume_erase_all(v);
- }
-
- return 0;
-}
-
-static int
-jffs2_mark(int argc, char **argv)
-{
- __u32 deadc0de = __cpu_to_be32(0xdeadc0de);
- struct volume *v;
- size_t sz;
- int fd;
-
- if (ask_user(argc, argv))
- return -1;
-
- v = volume_find("rootfs_data");
- if (!v) {
- fprintf(stderr, "no rootfs_data was found\n");
- return -1;
- }
-
- fd = open(v->blk, O_WRONLY);
- fprintf(stderr, "%s - marking with deadc0de\n", v->blk);
- if (!fd) {
- fprintf(stderr, "opening %s failed\n", v->blk);
- return -1;
- }
-
- sz = write(fd, &deadc0de, sizeof(deadc0de));
- close(fd);
-
- if (sz != 1) {
- fprintf(stderr, "writing %s failed: %s\n", v->blk, strerror(errno));
- return -1;
- }
-
- return 0;
-}
-
-int
-jffs2_switch(int argc, char **argv)
-{
- struct volume *v;
- char *mp;
- int ret = -1;
-
- if (find_overlay_mount("overlayfs:/tmp/root"))
- return -1;
-
- if (find_filesystem("overlay")) {
- fprintf(stderr, "overlayfs not found\n");
- return ret;
- }
-
- v = volume_find("rootfs_data");
- mp = find_mount_point(v->blk, NULL);
- if (mp) {
- fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
- return -1;
- }
-
- switch (volume_identify(v)) {
- case FS_NONE:
- fprintf(stderr, "no jffs2 marker found\n");
- /* fall through */
-
- case FS_DEADCODE:
- ret = switch2jffs();
- if (!ret) {
- fprintf(stderr, "doing fo cleanup\n");
- umount2("/tmp/root", MNT_DETACH);
- foreachdir("/overlay/", handle_whiteout);
- }
- break;
-
- case FS_JFFS2:
- ret = jffs2_mount();
- if (ret)
- break;
- if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
- fprintf(stderr, "switching to jffs2 failed\n");
- ret = -1;
- }
- break;
- }
-
- return ret;
-}
-
-static int overlay_mount_fs(void)
-{
- struct volume *v;
-
- if (mkdir("/tmp/overlay", 0755)) {
- fprintf(stderr, "failed to mkdir /tmp/overlay: %s\n", strerror(errno));
- return -1;
- }
-
- v = volume_find("rootfs_data");
- if (!v) {
- fprintf(stderr, "rootfs_data does not exist\n");
- return -1;
- }
-
- if (mount(v->blk, "/tmp/overlay", "jffs2", MS_NOATIME, NULL)) {
- fprintf(stderr, "failed to mount -t jffs2 %s /tmp/overlay: %s\n",
- v->blk, strerror(errno));
- return -1;
- }
-
- volume_init(v);
-
- return -1;
-}
-
-static int overlay_mount(void)
-{
- struct volume *v = volume_find("rootfs_data");;
- char *mp;
-
- if (!v)
- return -1;
-
- mp = find_mount_point(v->blk, NULL);
- if (mp) {
- fprintf(stderr, "rootfs_data:%s is already mounted as %s\n", v->blk, mp);
- return -1;
- }
-
- overlay_mount_fs();
-
- extroot_prefix = "/tmp/overlay";
- if (!backend_mount("extroot")) {
- fprintf(stderr, "fs-state: switched to extroot\n");
- return 0;
- }
-
- fprintf(stderr, "switching to jffs2\n");
- if (mount_move("/tmp", "", "/overlay") || fopivot("/overlay", "/rom")) {
- fprintf(stderr, "switching to jffs2 failed - fallback to ramoverlay\n");
- return ramoverlay();
- }
-
- return -1;
-}
-
-static struct backend_handler jffs2_handlers[] = {
-{
- .name = "jffs2reset",
- .cli = jffs2_reset,
-}, {
- .name = "jffs2mark",
- .cli = jffs2_mark,
-}};
-
-static struct backend overlay_backend = {
- .name = "overlay",
- .num_handlers = ARRAY_SIZE(jffs2_handlers),
- .handlers = jffs2_handlers,
- .mount = overlay_mount,
-};
-BACKEND(overlay_backend);
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