diff options
Diffstat (limited to 'recovery-persist.cpp')
| -rw-r--r-- | recovery-persist.cpp | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/recovery-persist.cpp b/recovery-persist.cpp deleted file mode 100644 index 8587e9a66..000000000 --- a/recovery-persist.cpp +++ /dev/null @@ -1,200 +0,0 @@ -/* - * Copyright (C) 2016 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. - */ - -#define LOG_TAG "recovery-persist" - -// -// Strictly to deal with reboot into system after OTA after /data -// mounts to pull the last pmsg file data and place it -// into /data/misc/recovery/ directory, rotating it in. -// -// Usage: recovery-persist [--force-persist] -// -// On systems without /cache mount, all file content representing in the -// recovery/ directory stored in /sys/fs/pstore/pmsg-ramoops-0 in logger -// format that reside in the LOG_ID_SYSTEM buffer at ANDROID_LOG_INFO -// priority or higher is transfered to the /data/misc/recovery/ directory. -// The content is matched and rotated in as need be. -// -// --force-persist ignore /cache mount, always rotate in the contents. -// - -#include <errno.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#include <string> - -#include <android/log.h> /* Android Log Priority Tags */ -#include <android-base/file.h> -#include <log/log.h> -#include <log/logger.h> /* Android Log packet format */ -#include <private/android_logger.h> /* private pmsg functions */ - -static const char *LAST_LOG_FILE = "/data/misc/recovery/last_log"; -static const char *LAST_PMSG_FILE = "/sys/fs/pstore/pmsg-ramoops-0"; -static const char *LAST_KMSG_FILE = "/data/misc/recovery/last_kmsg"; -static const char *LAST_CONSOLE_FILE = "/sys/fs/pstore/console-ramoops-0"; - -static const int KEEP_LOG_COUNT = 10; - -// 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)) SLOGE("%s %s", name, strerror(errno)); - fclose(fp); -} - -static void copy_file(const char* source, const char* destination) { - FILE* dest_fp = fopen(destination, "w"); - if (dest_fp == nullptr) { - SLOGE("%s %s", destination, strerror(errno)); - } else { - FILE* source_fp = fopen(source, "r"); - if (source_fp != nullptr) { - char buf[4096]; - size_t bytes; - while ((bytes = fread(buf, 1, sizeof(buf), source_fp)) != 0) { - fwrite(buf, 1, bytes, dest_fp); - } - check_and_fclose(source_fp, source); - } - check_and_fclose(dest_fp, destination); - } -} - -static bool rotated = false; - -// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max. -// Similarly rename last_kmsg -> last_kmsg.1 -> ... -> last_kmsg.$max. -// Overwrite any existing last_log.$max and last_kmsg.$max. -static void rotate_logs(int max) { - // Logs should only be rotated once. - - if (rotated) { - return; - } - rotated = true; - - for (int i = max-1; i >= 0; --i) { - std::string old_log(LAST_LOG_FILE); - if (i > 0) { - old_log += "." + std::to_string(i); - } - std::string new_log(LAST_LOG_FILE); - new_log += "." + std::to_string(i+1); - - // Ignore errors if old_log doesn't exist. - rename(old_log.c_str(), new_log.c_str()); - - std::string old_kmsg(LAST_KMSG_FILE); - if (i > 0) { - old_kmsg += "." + std::to_string(i); - } - std::string new_kmsg(LAST_KMSG_FILE); - new_kmsg += "." + std::to_string(i+1); - - rename(old_kmsg.c_str(), new_kmsg.c_str()); - } -} - -ssize_t logsave( - log_id_t /* logId */, - char /* prio */, - const char *filename, - const char *buf, size_t len, - void * /* arg */) { - - std::string destination("/data/misc/"); - destination += filename; - - std::string buffer(buf, len); - - { - std::string content; - android::base::ReadFileToString(destination, &content); - - if (buffer.compare(content) == 0) { - return len; - } - } - - // ToDo: Any others that match? Are we pulling in multiple - // already-rotated files? Algorithm thus far is KISS: one file, - // one rotation allowed. - - rotate_logs(KEEP_LOG_COUNT); - - return android::base::WriteStringToFile(buffer, destination.c_str()); -} - -int main(int argc, char **argv) { - - /* Is /cache a mount?, we have been delivered where we are not wanted */ - /* - * Following code halves the size of the executable as compared to: - * - * load_volume_table(); - * has_cache = volume_for_path(CACHE_ROOT) != nullptr; - */ - bool has_cache = false; - static const char mounts_file[] = "/proc/mounts"; - FILE *fp = fopen(mounts_file, "r"); - if (!fp) { - SLOGV("%s %s", mounts_file, strerror(errno)); - } else { - char *line = NULL; - size_t len = 0; - ssize_t read; - while ((read = getline(&line, &len, fp)) != -1) { - if (strstr(line, " /cache ")) { - has_cache = true; - break; - } - } - free(line); - fclose(fp); - } - - if (has_cache) { - /* - * TBD: Future location to move content from - * /cache/recovery to /data/misc/recovery/ - */ - /* if --force-persist flag, then transfer pmsg data anyways */ - if ((argc <= 1) || !argv[1] || strcmp(argv[1], "--force-persist")) { - return 0; - } - } - - /* Is there something in pmsg? */ - if (access(LAST_PMSG_FILE, R_OK)) { - return 0; - } - - // Take last pmsg file contents and send it off to the logsave - __android_log_pmsg_file_read( - LOG_ID_SYSTEM, ANDROID_LOG_INFO, "recovery/", logsave, NULL); - - /* Is there a last console log too? */ - if (rotated && !access(LAST_CONSOLE_FILE, R_OK)) { - copy_file(LAST_CONSOLE_FILE, LAST_KMSG_FILE); - } - - return 0; -} |