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android_bootable_recovery/roots.c
Koushik Dutta ddc2e39dcf fix fstab generation 
Change-Id: I223a07fd0ce3c0d48b7f18f5c42ae204affe087a
2010-11-27 17:53:50 -08:00

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/*
* Copyright (C) 2007 The Android Open Source Project
* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include "flashutils/flashutils.h"
#include "minzip/Zip.h"
#include "roots.h"
#include "common.h"
#include "mounts.h"
#include "extendedcommands.h"
/* Canonical pointers.
xxx may just want to use enums
*/
static const char g_default_device[] = "@\0g_default_device";
static const char g_raw[] = "@\0g_raw";
static const char g_package_file[] = "@\0g_package_file";
static RootInfo g_roots[] = {
{ "BOOT:", g_default_device, NULL, "boot", NULL, g_raw, NULL },
{ "CACHE:", BOARD_CACHE_DEVICE, NULL, "cache", "/cache", BOARD_CACHE_FILESYSTEM, BOARD_CACHE_FILESYSTEM_OPTIONS },
{ "DATA:", BOARD_DATA_DEVICE, NULL, "userdata", "/data", BOARD_DATA_FILESYSTEM, BOARD_DATA_FILESYSTEM_OPTIONS },
#ifdef BOARD_HAS_DATADATA
{ "DATADATA:", BOARD_DATADATA_DEVICE, NULL, "datadata", "/datadata", BOARD_DATADATA_FILESYSTEM, BOARD_DATADATA_FILESYSTEM_OPTIONS },
#endif
{ "MISC:", g_default_device, NULL, "misc", NULL, g_raw, NULL },
{ "PACKAGE:", NULL, NULL, NULL, NULL, g_package_file, NULL },
{ "RECOVERY:", g_default_device, NULL, "recovery", "/", g_raw, NULL },
{ "SDCARD:", BOARD_SDCARD_DEVICE_PRIMARY, BOARD_SDCARD_DEVICE_SECONDARY, NULL, "/sdcard", "vfat", NULL },
{ "SDEXT:", BOARD_SDEXT_DEVICE, NULL, NULL, "/sd-ext", BOARD_SDEXT_FILESYSTEM, NULL },
{ "SYSTEM:", BOARD_SYSTEM_DEVICE, NULL, "system", "/system", BOARD_SYSTEM_FILESYSTEM, BOARD_SYSTEM_FILESYSTEM_OPTIONS },
{ "MBM:", g_default_device, NULL, "mbm", NULL, g_raw, NULL },
{ "TMP:", NULL, NULL, NULL, "/tmp", NULL, NULL },
};
#define NUM_ROOTS (sizeof(g_roots) / sizeof(g_roots[0]))
// TODO: for SDCARD:, try /dev/block/mmcblk0 if mmcblk0p1 fails
const RootInfo *
get_root_info_for_path(const char *root_path)
{
const char *c;
/* Find the first colon.
*/
c = root_path;
while (*c != '\0' && *c != ':') {
c++;
}
if (*c == '\0') {
return NULL;
}
size_t len = c - root_path + 1;
size_t i;
for (i = 0; i < NUM_ROOTS; i++) {
RootInfo *info = &g_roots[i];
if (strncmp(info->name, root_path, len) == 0) {
return info;
}
}
return NULL;
}
static const ZipArchive *g_package = NULL;
static char *g_package_path = NULL;
int
register_package_root(const ZipArchive *package, const char *package_path)
{
if (package != NULL) {
package_path = strdup(package_path);
if (package_path == NULL) {
return -1;
}
g_package_path = (char *)package_path;
} else {
free(g_package_path);
g_package_path = NULL;
}
g_package = package;
return 0;
}
int
is_package_root_path(const char *root_path)
{
const RootInfo *info = get_root_info_for_path(root_path);
return info != NULL && info->filesystem == g_package_file;
}
const char *
translate_package_root_path(const char *root_path,
char *out_buf, size_t out_buf_len, const ZipArchive **out_package)
{
const RootInfo *info = get_root_info_for_path(root_path);
if (info == NULL || info->filesystem != g_package_file) {
return NULL;
}
/* Strip the package root off of the path.
*/
size_t root_len = strlen(info->name);
root_path += root_len;
size_t root_path_len = strlen(root_path);
if (out_buf_len < root_path_len + 1) {
return NULL;
}
strcpy(out_buf, root_path);
*out_package = g_package;
return out_buf;
}
/* Takes a string like "SYSTEM:lib" and turns it into a string
* like "/system/lib". The translated path is put in out_buf,
* and out_buf is returned if the translation succeeded.
*/
const char *
translate_root_path(const char *root_path, char *out_buf, size_t out_buf_len)
{
if (out_buf_len < 1) {
return NULL;
}
const RootInfo *info = get_root_info_for_path(root_path);
if (info == NULL || info->mount_point == NULL) {
return NULL;
}
/* Find the relative part of the non-root part of the path.
*/
root_path += strlen(info->name); // strip off the "root:"
while (*root_path != '\0' && *root_path == '/') {
root_path++;
}
size_t mp_len = strlen(info->mount_point);
size_t rp_len = strlen(root_path);
if (mp_len + 1 + rp_len + 1 > out_buf_len) {
return NULL;
}
/* Glue the mount point to the relative part of the path.
*/
memcpy(out_buf, info->mount_point, mp_len);
if (out_buf[mp_len - 1] != '/') out_buf[mp_len++] = '/';
memcpy(out_buf + mp_len, root_path, rp_len);
out_buf[mp_len + rp_len] = '\0';
return out_buf;
}
static int
internal_root_mounted(const RootInfo *info)
{
if (info->mount_point == NULL) {
return -1;
}
//xxx if TMP: (or similar) just say "yes"
/* See if this root is already mounted.
*/
int ret = scan_mounted_volumes();
if (ret < 0) {
return ret;
}
const MountedVolume *volume;
volume = find_mounted_volume_by_mount_point(info->mount_point);
if (volume != NULL) {
/* It's already mounted.
*/
return 0;
}
return -1;
}
int
is_root_path_mounted(const char *root_path)
{
const RootInfo *info = get_root_info_for_path(root_path);
if (info == NULL) {
return -1;
}
return internal_root_mounted(info) >= 0;
}
static int mount_internal(const char* device, const char* mount_point, const char* filesystem, const char* filesystem_options)
{
if (strcmp(filesystem, "auto") != 0 && filesystem_options == NULL) {
return mount(device, mount_point, filesystem, MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
}
else {
char mount_cmd[PATH_MAX];
const char* options = filesystem_options == NULL ? "noatime,nodiratime,nodev" : filesystem_options;
sprintf(mount_cmd, "mount -t %s -o%s %s %s", filesystem, options, device, mount_point);
return __system(mount_cmd);
}
}
int
ensure_root_path_mounted(const char *root_path)
{
const RootInfo *info = get_root_info_for_path(root_path);
if (info == NULL) {
return -1;
}
int ret = internal_root_mounted(info);
if (ret >= 0) {
/* It's already mounted.
*/
return 0;
}
/* It's not mounted.
*/
if (info->device == NULL || info->mount_point == NULL ||
info->filesystem == NULL ||
info->filesystem == g_raw ||
info->filesystem == g_package_file) {
return -1;
}
if (info->device == g_default_device) {
if (info->partition_name == NULL) {
return -1;
}
return mount_partition(info->partition_name, info->mount_point, info->filesystem, 0);
}
mkdir(info->mount_point, 0755); // in case it doesn't already exist
if (mount_internal(info->device, info->mount_point, info->filesystem, info->filesystem_options)) {
if (info->device2 == NULL) {
LOGE("Can't mount %s\n(%s)\n", info->device, strerror(errno));
return -1;
} else if (mount(info->device2, info->mount_point, info->filesystem,
MS_NOATIME | MS_NODEV | MS_NODIRATIME, "")) {
LOGE("Can't mount %s (or %s)\n(%s)\n",
info->device, info->device2, strerror(errno));
return -1;
}
}
return 0;
}
int
ensure_root_path_unmounted(const char *root_path)
{
const RootInfo *info = get_root_info_for_path(root_path);
if (info == NULL) {
return -1;
}
if (info->mount_point == NULL) {
/* This root can't be mounted, so by definition it isn't.
*/
return 0;
}
//xxx if TMP: (or similar) just return error
/* See if this root is already mounted.
*/
int ret = scan_mounted_volumes();
if (ret < 0) {
return ret;
}
const MountedVolume *volume;
volume = find_mounted_volume_by_mount_point(info->mount_point);
if (volume == NULL) {
/* It's not mounted.
*/
return 0;
}
return unmount_mounted_volume(volume);
}
int
get_root_partition_device(const char *root_path, char *device)
{
const RootInfo *info = get_root_info_for_path(root_path);
if (info == NULL)
{
return NULL;
}
if (info->device == g_default_device)
return get_partition_device(info->partition_name, device);
return info->device;
}
#ifndef BOARD_HAS_NO_MISC_PARTITION
const MtdPartition *
get_root_mtd_partition(const char *root_path)
{
const RootInfo *info = get_root_info_for_path(root_path);
if (info == NULL || info->device != g_default_device ||
info->partition_name == NULL)
{
#ifdef BOARD_HAS_MTD_CACHE
if (strcmp(root_path, "CACHE:") != 0)
return NULL;
#else
return NULL;
#endif
}
mtd_scan_partitions();
return mtd_find_partition_by_name(info->partition_name);
}
#endif
int
format_root_device(const char *root)
{
/* Be a little safer here; require that "root" is just
* a device with no relative path after it.
*/
const char *c = root;
while (*c != '\0' && *c != ':') {
c++;
}
/*
if (c[0] != ':' || c[1] != '\0') {
LOGW("format_root_device: bad root name \"%s\"\n", root);
return -1;
}
*/
const RootInfo *info = get_root_info_for_path(root);
if (info == NULL || info->device == NULL) {
LOGW("format_root_device: can't resolve \"%s\"\n", root);
return -1;
}
if (info->mount_point != NULL && info->device == g_default_device) {
/* Don't try to format a mounted device.
*/
int ret = ensure_root_path_unmounted(root);
if (ret < 0) {
LOGW("format_root_device: can't unmount \"%s\"\n", root);
return ret;
}
}
/* Format the device.
*/
if (info->device == g_default_device) {
int ret = 0;
if (info->filesystem == g_raw)
ret = erase_raw_partition(info->partition_name);
else
ret = erase_partition(info->partition_name, info->filesystem);
if (ret != 0)
LOGE("Error erasing device %s\n", info->device);
return ret;
}
return format_unknown_device(root);
}
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