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HYL_OK3568_LINUX/external/recovery/roots.c
HYL c6e7b553e6 first commit
2025-05-10 21:49:39 +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 <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <ctype.h>
#include "mtdutils/mtdutils.h"
#include "mtdutils/mounts.h"
#include "roots.h"
#include "common.h"
#include "rktools.h"
#include "mtdutils/rk29.h"
static int num_volumes = 0;
static Volume* device_volumes = NULL;
static char mount_point[256] = {0};
#define VOLUME_TO_LABEL(v) ((strrchr(v->mount_point, '/') ? : "/unknown") + 1)
char * get_link_path(const char* linkpath, char * buf, int count)
{
int i;
int rslt;
char path[256];
memset(path, 0, sizeof(path));
strcpy(path, linkpath);
for (i = strlen(linkpath); i > 0; i--) {
if (path[i] == '/') {
path[i] = '\0';
break;
}
}
rslt = readlink(path, buf, count - 1);
if (rslt < 0 || (rslt >= count - 1)) {
// printf("No link to path [%s]!!! \n", path);
return NULL;
}
if (buf[0] != '/') {
char tmp[256];
memset(tmp, 0, sizeof(tmp));
memcpy(tmp, buf, strlen(buf));
memset(buf, 0, sizeof(buf));
memcpy(buf + 1, tmp, strlen(tmp));
buf[0] = '/';
}
// printf("buf = %s \n", buf);
return buf;
}
const char* get_mounted_device_from_path(const char* path)
{
const MountedVolume *volume;
int result = scan_mounted_volumes();
if (result < 0) {
LOGE("failed to scan mounted volumes\n");
return NULL;
}
volume = find_mounted_volume_by_mount_point(path);
if (!volume) {
LOGE("failed to get volume from %s\n", path);
return NULL;
}
return volume->device;
}
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].option = NULL;
device_volumes[0].dump = NULL;
device_volumes[0].pass = NULL;
num_volumes = 1;
FILE* fstab = fopen("/etc/fstab", "r");
if (fstab == NULL) {
LOGE("failed to open /etc/fstab (%d)\n", errno);
return;
}
char buffer[1024];
char file_system[1024];
char mount_point[1024];
char fs_type[1024];
char option[1024];
char dump[1024];
char pass[1024];
char device[1024];
int i;
while (fgets(buffer, sizeof(buffer) - 1, fstab)) {
i = sscanf(buffer, "%s %s %s %s %s %s", file_system,
mount_point, fs_type, option, dump, pass);
if (file_system[0] == '#') continue;
//printf("load_volume_table file_system:%s, mount_point:%s, fs_type:%s, option:%s, dump:%s, pass:%s\n", file_system, mount_point, fs_type, option, dump, pass);
/* HACK: Convert *LABEL to "by-name" symlink */
if (strstr(file_system, "LABEL="))
snprintf(device, sizeof(device), "/dev/block/by-name/%s",
strstr(file_system, "LABEL=") + strlen("LABEL="));
else
strcpy(device, file_system);
if (i == 6) {
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].option = strdup(option);
device_volumes[num_volumes].dump = strdup(dump);
device_volumes[num_volumes].pass = strdup(pass);
device_volumes[num_volumes].device = strdup(device);;
device_volumes[num_volumes].device2 = NULL;
++num_volumes;
} else {
LOGE("skipping malformed recovery.fstab line: %s\n", buffer);
}
}
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 %s %s\n", i, v->device, v->mount_point, v->fs_type, v->option, v->dump, v->pass);
}
printf("\n");
}
Volume* volume_for_path(const char* path)
{
int i;
memset(mount_point, 0, sizeof(mount_point));
char* tmp = get_link_path(path, mount_point, 1024);
// if ( tmp != NULL)
// printf(" ### get mount_ponit = %s ### \n", mount_point);
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] == '/')) {
//printf(" ===path = %s, v-mount_point = %s ===\n",path, v->mount_point);
return v;
} else {
//add by chad.ma for symbol link file. eg. sdcard/ --->mnt/sdcard
if (!tmp)
continue;
//printf(" # v->mount_point = %s\n", v->mount_point);
if (strncmp(mount_point, v->mount_point, len) == 0 &&
(path[len] == '\0' || path[len] == '/')) {
return v;
}
}
}
return NULL;
}
int ensure_path_mounted(const char* path)
{
if (access(path, F_OK) == 0)
return 0;
Volume* v = volume_for_path(path);
if (v == NULL) {
if (mount_point[0] != 0) {
int 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(mount_point);
if (mv) {
// volume is already mounted
LOGI("%s already mounted \n", path);
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;
}
const MountedVolume* mv =
find_mounted_volume_by_mount_point(v->mount_point);
if (mv) {
// volume is already mounted
return 0;
}
mkdir(v->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, v->mount_point);
return -1;
}
return mtd_mount_partition(partition, v->mount_point, v->fs_type, 0);
} else if (strcmp(v->fs_type, "ext4") == 0 ||
strcmp(v->fs_type, "vfat") == 0 ||
strcmp(v->fs_type, "ext2") == 0) {
char *blk_device;
blk_device = (char*)v->device;
if (strcmp("/mnt/sdcard", v->mount_point) == 0) {
blk_device = getenv(SD_POINT_NAME);
if (blk_device == NULL) {
setFlashPoint();
blk_device = getenv(SD_POINT_NAME);
}
result = mount(blk_device, v->mount_point, v->fs_type,
MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
if (result == 0) return 0;
}
result = mount(v->device, v->mount_point, v->fs_type,
MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
if (result == 0) return 0;
if (v->device2) {
LOGW("failed to mount %s (%s); trying %s\n",
v->device, strerror(errno), v->device2);
result = mount(v->device2, v->mount_point, v->fs_type,
MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
if (result == 0) return 0;
}
LOGE("failed to mount %s (%s)\n", v->mount_point, strerror(errno));
return -1;
}
LOGE("unknown fs_type \"%s\" for %s\n", v->fs_type, v->mount_point);
return -1;
}
int ensure_ex_path_unmounted(const char* path)
{
int result;
result = scan_mounted_volumes();
if (result < 0) {
LOGE("unknown volume for path [%s]\n", path);
return -1;
}
const MountedVolume* mv =
find_mounted_volume_by_mount_point(path);
if (mv == NULL) {
LOGE("path: %s is already unmounted or not existed\n");
return 0;
}
return unmount_mounted_volume(mv);
}
int ensure_path_unmounted(const char* path)
{
Volume* v = volume_for_path(path);
if (v == NULL) {
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);
const char *label;
if (v == NULL) {
LOGE("unknown volume \"%s\"\n", volume);
return -1;
}
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) {
LOGE("can't give path \"%s\" to format_volume\n", volume);
return -1;
}
if (ensure_path_unmounted(volume) != 0) {
LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point);
return -1;
}
label = VOLUME_TO_LABEL(v);
if (strcmp(v->fs_type, "yaffs2") == 0 || strcmp(v->fs_type, "mtd") == 0 || strcmp(v->fs_type, "ubifs") == 0 ) {
mtd_scan_partitions();
char filepath[20];
if (strstr(v->device, "userdata") != NULL) {
strcpy(filepath, "userdata");
LOGW("change v->device from %s to %s.\n", v->device, filepath);
} else {
strcpy(filepath, v->device);
}
const MtdPartition* partition = mtd_find_partition_by_name(filepath);
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_ext4(v->device, label);
if (result != 0) {
LOGE("format_volume: make_extf4 failed on %s\n", v->device);
return -1;
}
return 0;
}
if (strcmp(v->fs_type, "ext2") == 0) {
int result = make_ext2(v->device, label);
if (result != 0) {
LOGE("format_volume: make_extf2 failed on %s\n", v->device);
return -1;
}
return 0;
}
if (strcmp(v->fs_type, "vfat") == 0) {
int result = make_vfat(v->device, label);
if (result != 0) {
LOGE("format_volume: make_vfat failed on %s\n", v->device);
return -1;
}
return 0;
}
if (strcmp(v->fs_type, "ntfs") == 0) {
int result = make_ntfs(v->device, label);
if (result != 0) {
LOGE("format_volume: make_ntfs failed on %s\n", v->device);
return -1;
}
return 0;
}
LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type);
return -1;
}
int resize_volume(const char* volume)
{
Volume* v = volume_for_path(volume);
if (v == NULL) {
LOGE("unknown volume \"%s\"\n", volume);
return -1;
}
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) {
LOGE("can't give path \"%s\" to format_volume\n", volume);
return -1;
}
if (ensure_path_unmounted(volume) != 0) {
LOGE("format_volume failed to unmount \"%s\"\n", v->mount_point);
return -1;
}
if ((strcmp(v->fs_type, "ext4") == 0) || (strcmp(v->fs_type, "ext2") == 0)) {
int result = rk_check_and_resizefs(v->device);
if (result != 0) {
LOGE("resize_volume: resizefs failed on %s\n", v->device);
return -1;
}
return 0;
}
LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type);
return -1;
}
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