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1e2da51172
android_bootable_recovery/roots.c
Koushik Dutta e2a66586a3 fix up key value parsing 
Change-Id: I05e821cd1215c44be780694644e568676fd67565
2012-01-29 14:03:04 -08:00

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/*
* Copyright (C) 2007 The Android Open Source Project
*
* 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 <ctype.h>
#include "mtdutils/mtdutils.h"
#include "mounts.h"
#include "roots.h"
#include "common.h"
#include "make_ext4fs.h"
#include "flashutils/flashutils.h"
#include "extendedcommands.h"
int num_volumes;
Volume* device_volumes;
int get_num_volumes() {
return num_volumes;
}
Volume* get_device_volumes() {
return device_volumes;
}
static int is_null(const char* sz) {
if (sz == NULL)
return 1;
if (strcmp("NULL", sz) == 0)
return 1;
return 0;
}
static char* dupe_string(const char* sz) {
if (is_null(sz))
return NULL;
return strdup(sz);
}
static int parse_options(char* options, Volume* volume) {
char* option;
while (option = strtok(options, ",")) {
options = NULL;
if (strncmp(option, "length=", 7) == 0) {
volume->length = strtoll(option+7, NULL, 10);
} else if (strncmp(option, "fstype2=", 8) == 0) {
volume->fs_type2 = volume->fs_type;
volume->fs_type = strdup(option + 8);
} else if (strncmp(option, "fs_options=", 11) == 0) {
volume->fs_options = strdup(option + 11);
} else if (strncmp(option, "fs_options2=", 12) == 0) {
volume->fs_options2 = strdup(option + 12);
} else {
LOGE("bad option \"%s\"\n", option);
return -1;
}
}
return 0;
}
void load_volume_table() {
int alloc = 2;
device_volumes = malloc(alloc * sizeof(Volume));
// Insert an entry for /tmp, which is the ramdisk and is always mounted.
device_volumes[0].mount_point = "/tmp";
device_volumes[0].fs_type = "ramdisk";
device_volumes[0].device = NULL;
device_volumes[0].device2 = NULL;
device_volumes[0].fs_type2 = NULL;
device_volumes[0].fs_options = NULL;
device_volumes[0].fs_options2 = NULL;
device_volumes[0].length = 0;
num_volumes = 1;
FILE* fstab = fopen("/etc/recovery.fstab", "r");
if (fstab == NULL) {
LOGE("failed to open /etc/recovery.fstab (%s)\n", strerror(errno));
return;
}
char buffer[1024];
int i;
while (fgets(buffer, sizeof(buffer)-1, fstab)) {
for (i = 0; buffer[i] && isspace(buffer[i]); ++i);
if (buffer[i] == '\0' || buffer[i] == '#') continue;
char* original = strdup(buffer);
char* mount_point = strtok(buffer+i, " \t\n");
char* fs_type = strtok(NULL, " \t\n");
char* device = strtok(NULL, " \t\n");
// lines may optionally have a second device, to use if
// mounting the first one fails.
char* options = NULL;
char* device2 = strtok(NULL, " \t\n");
if (device2) {
if (device2[0] == '/') {
options = strtok(NULL, " \t\n");
} else {
options = device2;
device2 = NULL;
}
}
if (mount_point && fs_type && device) {
while (num_volumes >= alloc) {
alloc *= 2;
device_volumes = realloc(device_volumes, alloc*sizeof(Volume));
}
device_volumes[num_volumes].mount_point = strdup(mount_point);
device_volumes[num_volumes].fs_type = strdup(fs_type);
device_volumes[num_volumes].device = strdup(device);
device_volumes[num_volumes].device2 =
device2 ? strdup(device2) : NULL;
device_volumes[num_volumes].length = 0;
device_volumes[num_volumes].fs_type2 = NULL;
device_volumes[num_volumes].fs_options = NULL;
device_volumes[num_volumes].fs_options2 = NULL;
if (parse_options(options, device_volumes + num_volumes) != 0) {
LOGE("skipping malformed recovery.fstab line: %s\n", original);
} else {
++num_volumes;
}
} else {
LOGE("skipping malformed recovery.fstab line: %s\n", original);
}
free(original);
}
fclose(fstab);
printf("recovery filesystem table\n");
printf("=========================\n");
for (i = 0; i < num_volumes; ++i) {
Volume* v = &device_volumes[i];
printf(" %d %s %s %s %s %lld\n", i, v->mount_point, v->fs_type,
v->device, v->device2, v->length);
}
printf("\n");
}
Volume* volume_for_path(const char* path) {
int i;
for (i = 0; i < num_volumes; ++i) {
Volume* v = device_volumes+i;
int len = strlen(v->mount_point);
if (strncmp(path, v->mount_point, len) == 0 &&
(path[len] == '\0' || path[len] == '/')) {
return v;
}
}
return NULL;
}
int try_mount(const char* device, const char* mount_point, const char* fs_type, const char* fs_options) {
if (device == NULL || mount_point == NULL || fs_type == NULL)
return -1;
int ret = 0;
if (fs_options == NULL) {
ret = mount(device, mount_point, fs_type,
MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
}
else {
char mount_cmd[PATH_MAX];
sprintf(mount_cmd, "mount -t %s -o%s %s %s", fs_type, fs_options, device, mount_point);
ret = __system(mount_cmd);
}
if (ret == 0)
return 0;
LOGW("failed to mount %s (%s)\n", device, strerror(errno));
return ret;
}
int is_data_media() {
Volume *data = volume_for_path("/data");
return data != NULL && strcmp(data->fs_type, "auto") == 0 || volume_for_path("/sdcard") == NULL;
}
void setup_data_media() {
rmdir("/sdcard");
mkdir("/data/media", 0755);
symlink("/data/media", "/sdcard");
}
int ensure_path_mounted(const char* path) {
return ensure_path_mounted_at_mount_point(path, NULL);
}
int ensure_path_mounted_at_mount_point(const char* path, const char* mount_point) {
Volume* v = volume_for_path(path);
if (v == NULL) {
// no /sdcard? let's assume /data/media
if (strstr(path, "/sdcard") == path && is_data_media()) {
LOGI("using /data/media, no /sdcard found.\n");
int ret;
if (0 != (ret = ensure_path_mounted("/data")))
return ret;
setup_data_media();
return 0;
}
LOGE("unknown volume for path [%s]\n", path);
return -1;
}
if (strcmp(v->fs_type, "ramdisk") == 0) {
// the ramdisk is always mounted.
return 0;
}
int result;
result = scan_mounted_volumes();
if (result < 0) {
LOGE("failed to scan mounted volumes\n");
return -1;
}
if (NULL == mount_point)
mount_point = v->mount_point;
const MountedVolume* mv =
find_mounted_volume_by_mount_point(mount_point);
if (mv) {
// volume is already mounted
return 0;
}
mkdir(mount_point, 0755); // in case it doesn't already exist
if (strcmp(v->fs_type, "yaffs2") == 0) {
// mount an MTD partition as a YAFFS2 filesystem.
mtd_scan_partitions();
const MtdPartition* partition;
partition = mtd_find_partition_by_name(v->device);
if (partition == NULL) {
LOGE("failed to find \"%s\" partition to mount at \"%s\"\n",
v->device, mount_point);
return -1;
}
return mtd_mount_partition(partition, mount_point, v->fs_type, 0);
} else if (strcmp(v->fs_type, "ext4") == 0 ||
strcmp(v->fs_type, "ext3") == 0 ||
strcmp(v->fs_type, "rfs") == 0 ||
strcmp(v->fs_type, "vfat") == 0) {
if ((result = try_mount(v->device, mount_point, v->fs_type, v->fs_options)) == 0)
return 0;
if ((result = try_mount(v->device2, mount_point, v->fs_type, v->fs_options)) == 0)
return 0;
if ((result = try_mount(v->device, mount_point, v->fs_type2, v->fs_options2)) == 0)
return 0;
if ((result = try_mount(v->device2, mount_point, v->fs_type2, v->fs_options2)) == 0)
return 0;
return result;
} else {
// let's try mounting with the mount binary and hope for the best.
char mount_cmd[PATH_MAX];
sprintf(mount_cmd, "mount %s", path);
return __system(mount_cmd);
}
LOGE("unknown fs_type \"%s\" for %s\n", v->fs_type, mount_point);
return -1;
}
int ensure_path_unmounted(const char* path) {
// if we are using /data/media, do not ever unmount volumes /data or /sdcard
if (volume_for_path("/sdcard") == NULL && (strstr(path, "/sdcard") == path || strstr(path, "/data") == path)) {
return 0;
}
Volume* v = volume_for_path(path);
if (v == NULL) {
// no /sdcard? let's assume /data/media
if (strstr(path, "/sdcard") == path && is_data_media()) {
return ensure_path_unmounted("/data");
}
LOGE("unknown volume for path [%s]\n", path);
return -1;
}
if (strcmp(v->fs_type, "ramdisk") == 0) {
// the ramdisk is always mounted; you can't unmount it.
return -1;
}
int result;
result = scan_mounted_volumes();
if (result < 0) {
LOGE("failed to scan mounted volumes\n");
return -1;
}
const MountedVolume* mv =
find_mounted_volume_by_mount_point(v->mount_point);
if (mv == NULL) {
// volume is already unmounted
return 0;
}
return unmount_mounted_volume(mv);
}
int format_volume(const char* volume) {
Volume* v = volume_for_path(volume);
if (v == NULL) {
// no /sdcard? let's assume /data/media
if (strstr(volume, "/sdcard") == volume && is_data_media()) {
return format_unknown_device(NULL, volume, NULL);
}
// silent failure for sd-ext
if (strcmp(volume, "/sd-ext") == 0)
return -1;
LOGE("unknown volume \"%s\"\n", volume);
return -1;
}
// check to see if /data is being formatted, and if it is /data/media
// Note: the /sdcard check is redundant probably, just being safe.
if (strstr(volume, "/data") == volume && volume_for_path("/sdcard") == NULL && is_data_media()) {
return format_unknown_device(NULL, volume, NULL);
}
if (strcmp(v->fs_type, "ramdisk") == 0) {
// you can't format the ramdisk.
LOGE("can't format_volume \"%s\"", volume);
return -1;
}
if (strcmp(v->mount_point, volume) != 0) {
#if 0
LOGE("can't give path \"%s\" to format_volume\n", volume);
return -1;
#endif
return format_unknown_device(v->device, volume, NULL);
}
if (ensure_path_unmounted(volume) != 0) {
LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point);
return -1;
}
if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0) {
mtd_scan_partitions();
const MtdPartition* partition = mtd_find_partition_by_name(v->device);
if (partition == NULL) {
LOGE("format_volume: no MTD partition \"%s\"\n", v->device);
return -1;
}
MtdWriteContext *write = mtd_write_partition(partition);
if (write == NULL) {
LOGW("format_volume: can't open MTD \"%s\"\n", v->device);
return -1;
} else if (mtd_erase_blocks(write, -1) == (off_t) -1) {
LOGW("format_volume: can't erase MTD \"%s\"\n", v->device);
mtd_write_close(write);
return -1;
} else if (mtd_write_close(write)) {
LOGW("format_volume: can't close MTD \"%s\"\n", v->device);
return -1;
}
return 0;
}
if (strcmp(v->fs_type, "ext4") == 0) {
int result = make_ext4fs(v->device, v->length);
if (result != 0) {
LOGE("format_volume: make_extf4fs failed on %s\n", v->device);
return -1;
}
return 0;
}
#if 0
LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type);
return -1;
#endif
return format_unknown_device(v->device, volume, v->fs_type);
}
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