C++ ensure_path_unmounted函数代码示例

int format_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, "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) {
        reset_ext4fs_info();
        int result = make_ext4fs(v->device, NULL, NULL, 0, 0, 0);
        if (result != 0) {
            LOGE("format_volume: make_extf4fs failed on %s\n", v->device);
            return -1;
        }
        return 0;
    }

    LOGE("format_volume: fs_type \"%s\" unsupported\n", v->fs_type);
    return -1;
}

//INTENT_MOUNT, mount recovery.fstab
static intentResult* intent_unmount(int argc, char* argv[])
{
    return_intent_result_if_fail(argc == 1);
    return_intent_result_if_fail(argv != NULL);
    int result = ensure_path_unmounted(argv[0]);
    if (result == 0)
        return miuiIntent_result_set(result, "ok");
    return miuiIntent_result_set(result, "fail");
}

int bml_check_volume(const char *path) {
    ui_print("Checking %s...\n", path);
    ensure_path_unmounted(path);
    if (0 == ensure_path_mounted(path)) {
        ensure_path_unmounted(path);
        return 0;
    }
    
    Volume *vol = volume_for_path(path);
    if (vol == NULL) {
        LOGE("Unable process volume! Skipping...\n");
        return 0;
    }
    
    ui_print("%s may be rfs. Checking...\n", path);
    char tmp[PATH_MAX];
    sprintf(tmp, "mount -t rfs %s %s", vol->device, path);
    int ret = __system(tmp);
    printf("%d\n", ret);
    return ret == 0 ? 1 : 0;
}

// backup /data/media support
// we reach here only if backup_data_media == 1
// backup_data_media can be set to 1 only in "custom backup and restore" menu AND if is_data_media() && !twrp_backup_mode.value
int nandroid_backup_datamedia(const char* backup_path) {
    char tmp[PATH_MAX];
    ui_print("\n>> Backing up /data/media...\n");
    if (is_data_media_volume_path(backup_path)) {
        // non fatal failure
        LOGE("  - can't backup folder to its self, skipping...\n");
        return 0;
    }

    if (0 != ensure_path_mounted("/data"))
        return -1;

    sprintf(tmp, "%s/%s", get_primary_storage_path(), NANDROID_HIDE_PROGRESS_FILE);
    ensure_path_mounted(tmp);
    int callback = !file_found(tmp);

    compute_directory_stats("/data/media");
    Volume *v = volume_for_path("/data");
    if (v == NULL)
        return -1;

    char backup_file_image[PATH_MAX];
    sprintf(backup_file_image, "%s/datamedia.%s", backup_path, v->fs_type == NULL ? "auto" : v->fs_type);

    int fmt;
    fmt = nandroid_get_default_backup_format();
    if (fmt == NANDROID_BACKUP_FORMAT_TAR) {
        sprintf(tmp, "cd / ; touch %s.tar ; set -o pipefail ; (tar -cpv data/media | split -a 1 -b 1000000000 /proc/self/fd/0 %s.tar.) 2> /proc/self/fd/1 ; exit $?",
                backup_file_image, backup_file_image);
    } else if (fmt == NANDROID_BACKUP_FORMAT_TGZ) {
        sprintf(tmp, "cd / ; touch %s.tar.gz ; set -o pipefail ; (tar -cpv data/media | pigz -c -%d | split -a 1 -b 1000000000 /proc/self/fd/0 %s.tar.gz.) 2> /proc/self/fd/1 ; exit $?",
                backup_file_image, compression_value.value, backup_file_image);
    } else {
        // non fatal failure
        LOGE("  - backup format must be tar(.gz), skipping...\n");
        return 0;
    }

    int ret;
    ret = do_tar_compress(tmp, callback, backup_file_image);

    ensure_path_unmounted("/data");

    if (0 != ret)
        return print_and_error("Failed to backup /data/media!\n", ret);

    ui_print("Backup of /data/media completed.\n");
    return 0;
}

int nandroid_restore_partition_extended(const char* backup_path, const char* mount_point, int umount_when_finished) {
    int ret = 0;
    char* name = basename(mount_point);
    
    char tmp[PATH_MAX];
    sprintf(tmp, "%s/%s.img", backup_path, name);
    struct stat file_info;
    if (0 != (ret = statfs(tmp, &file_info))) {
        ui_print("%s.img not found. Skipping restore of %s.\n", name, mount_point);
        return 0;
    }

    ensure_directory(mount_point);

    int callback = stat("/sdcard/clockworkmod/.hidenandroidprogress", &file_info) != 0;

    ui_print("Restoring %s...\n", name);
    /*
    if (0 != (ret = ensure_root_path_unmounted(root))) {
        ui_print("Can't unmount %s!\n", mount_point);
        return ret;
    }
    */
    if (0 != (ret = format_volume(mount_point))) {
        ui_print("Error while formatting %s!\n", mount_point);
        return ret;
    }
    
    if (0 != (ret = ensure_path_mounted(mount_point))) {
        ui_print("Can't mount %s!\n", mount_point);
        return ret;
    }
    
    nandroid_restore_handler restore_handler = get_restore_handler(mount_point);
    if (restore_handler == NULL) {
        ui_print("Error finding an appropriate restore handler.\n");
        return -2;
    }
    if (0 != (ret = restore_handler(tmp, mount_point, callback))) {
        ui_print("Error while restoring %s!\n", mount_point);
        return ret;
    }

    if (umount_when_finished) {
        ensure_path_unmounted(mount_point);
    }
    
    return 0;
}

static int 
copy_databk_to_data(){
	printf("begin copy databk to data\n");
    char *argv_execv[] = {"data_resume.sh", NULL};
	ensure_path_mounted("/data");
	ensure_path_mounted("/system");
    pid_t pid =fork();
	if(pid==0){
		execv("/system/bin/data_resume.sh",argv_execv);
		_exit(-1);
	}
	int status;
    waitpid(pid, &status, 0);
    if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
        printf("Error (Status %d),fail to resume data\n", WEXITSTATUS(status));
		ensure_path_unmounted("/data");
	    ensure_path_unmounted("/system");
        return -1;
    }
    printf("copy databk to data succeed\n");
	ensure_path_unmounted("/data");
	ensure_path_unmounted("/system"); 
    return 0;		 
}

/* add by cjcheng start... */
static int
smdt_update_directory(const char* path, const char* unmount_when_done,
                 int* wipe_cache) {
    ensure_path_mounted(path);
    int result;
    char new_path[PATH_MAX];
    strlcpy(new_path, path, PATH_MAX);
    strlcat(new_path, "/", PATH_MAX);
    strlcat(new_path, "update.zip", PATH_MAX);
    ui->Print("\n-- Install %s ...\n", new_path);
    if (access(new_path, F_OK) == 0) {
        ui->Print("\n read --  %s  ok...\n", new_path);
        ui->SetTipTitle(RecoveryUI::TIP_TITLE_READ_PACKAGE);
    } else {
        ui->Print("\n read --  %s  error...\n", new_path);
        if (unmount_when_done != NULL) {
            ensure_path_unmounted(unmount_when_done);
        }
	return INSTALL_ERROR;
    }

    set_sdcard_update_bootloader_message();

    char* copy = copy_sideloaded_package(new_path);
    if (unmount_when_done != NULL) {
         ensure_path_unmounted(unmount_when_done);
    }

    if (copy) {
        result = install_package(copy, wipe_cache, TEMPORARY_INSTALL_FILE);
        free(copy);
    } else {
        result = INSTALL_ERROR;
    }
    return result;
}

// clear the recovery command and prepare to boot a (hopefully working) system,
// copy our log file to cache as well (for the system to read), and
// record any intent we were asked to communicate back to the system.
// this function is idempotent: call it as many times as you like.
static void
finish_recovery(const char *send_intent) {
    // By this point, we're ready to return to the main system...
    if (send_intent != NULL) {
        FILE *fp = fopen_path(INTENT_FILE, "w");
        if (fp == NULL) {
            LOGE("Can't open %s\n", INTENT_FILE);
        } else {
            fputs(send_intent, fp);
            check_and_fclose(fp, INTENT_FILE);
        }
    }

    // Save the locale to cache, so if recovery is next started up
    // without a --locale argument (eg, directly from the bootloader)
    // it will use the last-known locale.
    if (locale != NULL) {
        LOGI("Saving locale \"%s\"\n", locale);
        FILE* fp = fopen_path(LOCALE_FILE, "w");
        fwrite(locale, 1, strlen(locale), fp);
        fflush(fp);
        fsync(fileno(fp));
        check_and_fclose(fp, LOCALE_FILE);
    }

    // Copy logs to cache so the system can find out what happened.
    copy_log_file(TEMPORARY_LOG_FILE, LOG_FILE, true);
    copy_log_file(TEMPORARY_LOG_FILE, LAST_LOG_FILE, false);
    copy_log_file(TEMPORARY_INSTALL_FILE, LAST_INSTALL_FILE, false);
    chmod(LOG_FILE, 0600);
    chown(LOG_FILE, 1000, 1000);   // system user
    chmod(LAST_LOG_FILE, 0640);
    chmod(LAST_INSTALL_FILE, 0644);

    // Reset to normal system boot so recovery won't cycle indefinitely.
    struct bootloader_message boot;
    memset(&boot, 0, sizeof(boot));
    set_bootloader_message(&boot);

    // Remove the command file, so recovery won't repeat indefinitely.
    if (ensure_path_mounted(COMMAND_FILE) != 0 ||
        (unlink(COMMAND_FILE) && errno != ENOENT)) {
        LOGW("Can't unlink %s\n", COMMAND_FILE);
    }

    ensure_path_unmounted(CACHE_ROOT);
    sync();  // For good measure.
}

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 nandroid_restore_partition_extended(const char* backup_path, const char* mount_point, int umount_when_finished) {
    int ret = 0;
    char* name = basename(mount_point);
    
    char tmp[PATH_MAX];
    sprintf(tmp, "%s/%s.img", backup_path, name);
    struct stat file_info;
    if (0 != (ret = statfs(tmp, &file_info))) {
        ui_print("%s.img没有发现. 放弃还原 %s.\n", name, mount_point);
        return 0;
    }

    ensure_directory(mount_point);

    unyaffs_callback callback = NULL;
    if (0 != stat("/sdcard/clockworkmod/.hidenandroidprogress", &file_info)) {
        callback = yaffs_callback;
    }

    ui_print("还原 %s...\n", name);
    /*
    if (0 != (ret = ensure_root_path_unmounted(root))) {
        ui_print("Can't unmount %s!\n", mount_point);
        return ret;
    }
    */
    if (0 != (ret = format_volume(mount_point))) {
        ui_print("格式化时出错 %s!\n", mount_point);
        return ret;
    }
    
    if (0 != (ret = ensure_path_mounted(mount_point))) {
        ui_print("不能挂载 %s!\n", mount_point);
        return ret;
    }
    
    if (0 != (ret = unyaffs(tmp, mount_point, callback))) {
        ui_print("还原时出错 %s!\n", mount_point);
        return ret;
    }

    if (umount_when_finished) {
        ensure_path_unmounted(mount_point);
    }
    
    return 0;
}

int nandroid_backup_partition_extended(const char* backup_path, const char* mount_point, int umount_when_finished) {

    int ret = 0;
    char name[PATH_MAX];
    char tmp[PATH_MAX];
    strcpy(name, basename(mount_point));

    struct stat file_info;
    build_configuration_path(tmp, NANDROID_HIDE_PROGRESS_FILE);
    ensure_path_mounted(tmp);
    int callback = stat(tmp, &file_info) != 0;

    ui_print("Backing up %s...\n", name);
    if (0 != (ret = ensure_path_mounted(mount_point) != 0)) {
        ui_print("Can't mount %s!\n", mount_point);
        return ret;
    }
    compute_directory_stats(mount_point);
    scan_mounted_volumes();
    Volume *v = volume_for_path(mount_point);
    const MountedVolume *mv = NULL;
    if (v != NULL)
        mv = find_mounted_volume_by_mount_point(v->mount_point);

    if (strcmp(backup_path, "-") == 0)
        sprintf(tmp, "/proc/self/fd/1");
    else if (mv == NULL || mv->filesystem == NULL)
        sprintf(tmp, "%s/%s.auto", backup_path, name);
    else
        sprintf(tmp, "%s/%s.%s", backup_path, name, mv->filesystem);
    nandroid_backup_handler backup_handler = get_backup_handler(mount_point);

    if (backup_handler == NULL) {
        ui_print("Error finding an appropriate backup handler.\n");
        return -2;
    }
    ret = backup_handler(mount_point, tmp, callback);
    if (umount_when_finished) {
        ensure_path_unmounted(mount_point);
    }
    if (0 != ret) {
        ui_print("Error while making a backup image of %s!\n", mount_point);
        return ret;
    }
    ui_print("Backup of %s completed.\n", name);
    return 0;
}

static int
erase_volume(const char *volume) {
    ui->SetBackground(RecoveryUI::INSTALLING);
    ui->SetProgressType(RecoveryUI::INDETERMINATE);
    ui->Print("Formatting %s...\n", volume);

    ensure_path_unmounted(volume);

    if (strcmp(volume, "/cache") == 0) {
        // Any part of the log we'd copied to cache is now gone.
        // Reset the pointer so we copy from the beginning of the temp
        // log.
        tmplog_offset = 0;
    }

    return format_volume(volume);
}

static int
erase_volume(const char *volume) {
    ui_set_background(BACKGROUND_ICON_INSTALLING);
    ui_show_indeterminate_progress();
    ui_print("Formatting %s...\n", volume);

    ensure_path_unmounted(volume);

    if (strcmp(volume, "/cache") == 0) {
        // Any part of the log we'd copied to cache is now gone.
        // Reset the pointer so we copy from the beginning of the temp
        // log.
        tmplog_offset = 0;
    }

    return format_volume(volume);
}

int nandroid_backup_partition_extended(const char* backup_path, const char* mount_point, int umount_when_finished) {

    int ret = 0;
    char name[PATH_MAX];
    strcpy(name, basename(mount_point));

    struct stat file_info;
    int callback = stat("/sdcard/clockworkmod/.hidenandroidprogress", &file_info) != 0;

    ui_print("备份中 %s...\n", name);
    if (0 != (ret = ensure_path_mounted(mount_point) != 0)) {
        ui_print("无法挂载 %s!\n", mount_point);
        return ret;
    }
    compute_directory_stats(mount_point);
    char tmp[PATH_MAX];
    scan_mounted_volumes();
    Volume *v = volume_for_path(mount_point);
    MountedVolume *mv = NULL;
    if (v != NULL)
        mv = find_mounted_volume_by_mount_point(v->mount_point);

    if (strcmp(backup_path, "-") == 0)
        sprintf(tmp, "/proc/self/fd/1");
    else if (mv == NULL || mv->filesystem == NULL)
        sprintf(tmp, "%s/%s.auto", backup_path, name);
    else
        sprintf(tmp, "%s/%s.%s", backup_path, name, mv->filesystem);
    nandroid_backup_handler backup_handler = get_backup_handler(mount_point);

    if (backup_handler == NULL) {
        ui_print("找不到合适的备份方案.\n");
        return -2;
    }
    ret = backup_handler(mount_point, tmp, callback);
    if (umount_when_finished) {
        ensure_path_unmounted(mount_point);
    }
    if (0 != ret) {
        ui_print("生成下列镜像文件时失败：  %s!\n", mount_point);
        return ret;
    }
    ui_print("备份 %s 完成.\n", name);
    return 0;
}

int setup_install_mounts() {
    if (fstab == NULL) {
        LOGE("can't set up install mounts: no fstab loaded\n");
        return -1;
    }
    for (int i = 0; i < fstab->num_entries; ++i) {
        Volume* v = fstab->recs + i;

        if (strcmp(v->mount_point, "/tmp") == 0 ||
            strcmp(v->mount_point, "/cache") == 0) {
            if (ensure_path_mounted(v->mount_point) != 0) return -1;

        } else {
            if (ensure_path_unmounted(v->mount_point) != 0) return -1;
        }
    }
    return 0;
}