diff options
Diffstat (limited to 'recovery.c')
| -rw-r--r-- | recovery.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/recovery.c b/recovery.c new file mode 100644 index 000000000..4570cb9f0 --- /dev/null +++ b/recovery.c @@ -0,0 +1,361 @@ +/* + * 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 <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <limits.h> +#include <linux/input.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/reboot.h> +#include <sys/types.h> +#include <time.h> +#include <unistd.h> + +#include "bootloader.h" +#include "commands.h" +#include "common.h" +#include "cutils/properties.h" +#include "firmware.h" +#include "install.h" +#include "minui/minui.h" +#include "minzip/DirUtil.h" +#include "roots.h" + +static const struct option OPTIONS[] = { + { "send_intent", required_argument, NULL, 's' }, + { "update_package", required_argument, NULL, 'u' }, + { "wipe_data", no_argument, NULL, 'w' }, + { "wipe_cache", no_argument, NULL, 'c' }, +}; + +static const char *COMMAND_FILE = "CACHE:recovery/command"; +static const char *INTENT_FILE = "CACHE:recovery/intent"; +static const char *LOG_FILE = "CACHE:recovery/log"; +static const char *SDCARD_PACKAGE_FILE = "SDCARD:update.zip"; +static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log"; + +/* + * The recovery tool communicates with the main system through /cache files. + * /cache/recovery/command - INPUT - command line for tool, one arg per line + * /cache/recovery/log - OUTPUT - combined log file from recovery run(s) + * /cache/recovery/intent - OUTPUT - intent that was passed in + * + * The arguments which may be supplied in the recovery.command file: + * --send_intent=anystring - write the text out to recovery.intent + * --update_package=root:path - verify install an OTA package file + * --wipe_data - erase user data (and cache), then reboot + * --wipe_cache - wipe cache (but not user data), then reboot + * + * After completing, we remove /cache/recovery/command and reboot. + */ + +static const int MAX_ARG_LENGTH = 4096; +static const int MAX_ARGS = 100; + +// open a file given in root:path format, mounting partitions as necessary +static FILE* +fopen_root_path(const char *root_path, const char *mode) { + if (ensure_root_path_mounted(root_path) != 0) { + LOGE("Can't mount %s\n", root_path); + return NULL; + } + + char path[PATH_MAX] = ""; + if (translate_root_path(root_path, path, sizeof(path)) == NULL) { + LOGE("Bad path %s\n", root_path); + return NULL; + } + + // When writing, try to create the containing directory, if necessary. + // Use generous permissions, the system (init.rc) will reset them. + if (strchr("wa", mode[0])) dirCreateHierarchy(path, 0777, NULL, 1); + + FILE *fp = fopen(path, mode); + if (fp == NULL) LOGE("Can't open %s\n", path); + return fp; +} + +// close a file, log an error if the error indicator is set +static void +check_and_fclose(FILE *fp, const char *name) { + fflush(fp); + if (ferror(fp)) LOGE("Error in %s\n(%s)\n", name, strerror(errno)); + fclose(fp); +} + +// command line args come from, in decreasing precedence: +// - the actual command line +// - the bootloader control block (one per line, after "recovery") +// - the contents of COMMAND_FILE (one per line) +static void +get_args(int *argc, char ***argv) { + if (*argc > 1) return; // actual command line arguments take priority + char *argv0 = (*argv)[0]; + + struct bootloader_message boot; + if (!get_bootloader_message(&boot)) { + if (boot.command[0] != 0 && boot.command[0] != 255) { + LOGI("Boot command: %.*s\n", sizeof(boot.command), boot.command); + } + + if (boot.status[0] != 0 && boot.status[0] != 255) { + LOGI("Boot status: %.*s\n", sizeof(boot.status), boot.status); + } + + // Ensure that from here on, a reboot goes back into recovery + strcpy(boot.command, "boot-recovery"); + set_bootloader_message(&boot); + + boot.recovery[sizeof(boot.recovery) - 1] = '\0'; // Ensure termination + const char *arg = strtok(boot.recovery, "\n"); + if (arg != NULL && !strcmp(arg, "recovery")) { + *argv = (char **) malloc(sizeof(char *) * MAX_ARGS); + (*argv)[0] = argv0; + for (*argc = 1; *argc < MAX_ARGS; ++*argc) { + if ((arg = strtok(NULL, "\n")) == NULL) break; + (*argv)[*argc] = strdup(arg); + } + LOGI("Got arguments from boot message\n"); + return; + } else if (boot.recovery[0] != 0 && boot.recovery[0] != 255) { + LOGE("Bad boot message\n\"%.20s\"\n", boot.recovery); + } + } + + FILE *fp = fopen_root_path(COMMAND_FILE, "r"); + if (fp == NULL) return; + + *argv = (char **) malloc(sizeof(char *) * MAX_ARGS); + (*argv)[0] = argv0; // use the same program name + + char buf[MAX_ARG_LENGTH]; + for (*argc = 1; *argc < MAX_ARGS && fgets(buf, sizeof(buf), fp); ++*argc) { + (*argv)[*argc] = strdup(strtok(buf, "\r\n")); // Strip newline. + } + + check_and_fclose(fp, COMMAND_FILE); + LOGI("Got arguments from %s\n", COMMAND_FILE); +} + + +// 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_root_path(INTENT_FILE, "w"); + if (fp != NULL) { + fputs(send_intent, fp); + check_and_fclose(fp, INTENT_FILE); + } + } + + // Copy logs to cache so the system can find out what happened. + FILE *log = fopen_root_path(LOG_FILE, "a"); + if (log != NULL) { + FILE *tmplog = fopen(TEMPORARY_LOG_FILE, "r"); + if (tmplog == NULL) { + LOGE("Can't open %s\n", TEMPORARY_LOG_FILE); + } else { + static long tmplog_offset = 0; + fseek(tmplog, tmplog_offset, SEEK_SET); // Since last write + char buf[4096]; + while (fgets(buf, sizeof(buf), tmplog)) fputs(buf, log); + tmplog_offset = ftell(tmplog); + check_and_fclose(tmplog, TEMPORARY_LOG_FILE); + } + check_and_fclose(log, LOG_FILE); + } + + // Reset the bootloader message to revert to a normal main system boot. + struct bootloader_message boot; + memset(&boot, 0, sizeof(boot)); + set_bootloader_message(&boot); + + // Remove the command file, so recovery won't repeat indefinitely. + char path[PATH_MAX] = ""; + if (ensure_root_path_mounted(COMMAND_FILE) != 0 || + translate_root_path(COMMAND_FILE, path, sizeof(path)) == NULL || + (unlink(path) && errno != ENOENT)) { + LOGW("Can't unlink %s\n", COMMAND_FILE); + } + + sync(); // For good measure. +} + +#define TEST_AMEND 0 +#if TEST_AMEND +static void +test_amend() +{ + extern int test_symtab(void); + extern int test_cmd_fn(void); + extern int test_permissions(void); + int ret; + LOGD("Testing symtab...\n"); + ret = test_symtab(); + LOGD(" returned %d\n", ret); + LOGD("Testing cmd_fn...\n"); + ret = test_cmd_fn(); + LOGD(" returned %d\n", ret); + LOGD("Testing permissions...\n"); + ret = test_permissions(); + LOGD(" returned %d\n", ret); +} +#endif // TEST_AMEND + +static int +erase_root(const char *root) +{ + ui_set_background(BACKGROUND_ICON_INSTALLING); + ui_show_indeterminate_progress(); + ui_print("Formatting %s...\n", root); + return format_root_device(root); +} + +static void +prompt_and_wait() +{ + ui_print("\n" + "Home+Back - reboot system now\n" + "Alt+L - toggle log text display\n" + "Alt+S - apply sdcard:update.zip\n" + "Alt+W - wipe data/factory reset\n"); + + for (;;) { + finish_recovery(NULL); + ui_reset_progress(); + int key = ui_wait_key(); + int alt = ui_key_pressed(KEY_LEFTALT) || ui_key_pressed(KEY_RIGHTALT); + + if (key == KEY_DREAM_BACK && ui_key_pressed(KEY_DREAM_HOME)) { + // Wait for the keys to be released, to avoid triggering + // special boot modes (like coming back into recovery!). + while (ui_key_pressed(KEY_DREAM_BACK) || + ui_key_pressed(KEY_DREAM_HOME)) { + usleep(1000); + } + break; + } else if (alt && key == KEY_W) { + ui_print("\n"); + erase_root("DATA:"); + erase_root("CACHE:"); + ui_print("Data wipe complete.\n"); + if (!ui_text_visible()) break; + } else if (alt && key == KEY_S) { + ui_print("\nInstalling from sdcard...\n"); + int status = install_package(SDCARD_PACKAGE_FILE); + if (status != INSTALL_SUCCESS) { + ui_set_background(BACKGROUND_ICON_ERROR); + ui_print("Installation aborted.\n"); + } else if (!ui_text_visible()) { + break; // reboot if logs aren't visible + } + ui_print("\nPress Home+Back to reboot\n"); + } + } +} + +static void +print_property(const char *key, const char *name, void *cookie) +{ + fprintf(stderr, "%s=%s\n", key, name); +} + +int +main(int argc, char **argv) +{ + time_t start = time(NULL); + + // If these fail, there's not really anywhere to complain... + freopen(TEMPORARY_LOG_FILE, "a", stdout); setbuf(stdout, NULL); + freopen(TEMPORARY_LOG_FILE, "a", stderr); setbuf(stderr, NULL); + fprintf(stderr, "Starting recovery on %s", ctime(&start)); + + ui_init(); + ui_print("Android system recovery utility\n"); + get_args(&argc, &argv); + + int previous_runs = 0; + const char *send_intent = NULL; + const char *update_package = NULL; + int wipe_data = 0, wipe_cache = 0; + + int arg; + while ((arg = getopt_long(argc, argv, "", OPTIONS, NULL)) != -1) { + switch (arg) { + case 'p': previous_runs = atoi(optarg); break; + case 's': send_intent = optarg; break; + case 'u': update_package = optarg; break; + case 'w': wipe_data = wipe_cache = 1; break; + case 'c': wipe_cache = 1; break; + case '?': + LOGE("Invalid command argument\n"); + continue; + } + } + + fprintf(stderr, "Command:"); + for (arg = 0; arg < argc; arg++) { + fprintf(stderr, " \"%s\"", argv[arg]); + } + fprintf(stderr, "\n\n"); + + property_list(print_property, NULL); + fprintf(stderr, "\n"); + +#if TEST_AMEND + test_amend(); +#endif + + RecoveryCommandContext ctx = { NULL }; + if (register_update_commands(&ctx)) { + LOGE("Can't install update commands\n"); + } + + int status = INSTALL_SUCCESS; + + if (update_package != NULL) { + status = install_package(update_package); + if (status != INSTALL_SUCCESS) ui_print("Installation aborted.\n"); + } else if (wipe_data || wipe_cache) { + if (wipe_data && erase_root("DATA:")) status = INSTALL_ERROR; + if (wipe_cache && erase_root("CACHE:")) status = INSTALL_ERROR; + if (status != INSTALL_SUCCESS) ui_print("Data wipe failed.\n"); + } else { + status = INSTALL_ERROR; // No command specified + } + + if (status != INSTALL_SUCCESS) ui_set_background(BACKGROUND_ICON_ERROR); + if (status != INSTALL_SUCCESS || ui_text_visible()) prompt_and_wait(); + + // If there is a radio image pending, reboot now to install it. + maybe_install_firmware_update(send_intent); + + // Otherwise, get ready to boot the main system... + finish_recovery(send_intent); + ui_print("Rebooting...\n"); + sync(); + reboot(RB_AUTOBOOT); + return EXIT_SUCCESS; +} |