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/*
* 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.
*/
//
// 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-base/file.h>
#include <android-base/logging.h>
#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 char *ALT_LAST_CONSOLE_FILE = "/sys/fs/pstore/console-ramoops";
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)) {
PLOG(ERROR) << "Error in " << name;
}
fclose(fp);
}
static void copy_file(const char* source, const char* destination) {
FILE* dest_fp = fopen(destination, "w");
if (dest_fp == nullptr) {
PLOG(ERROR) << "Can't open " << destination;
} 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) {
PLOG(ERROR) << "failed to open " << mounts_file;
} 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) {
if (!access(LAST_CONSOLE_FILE, R_OK)) {
copy_file(LAST_CONSOLE_FILE, LAST_KMSG_FILE);
} else if (!access(ALT_LAST_CONSOLE_FILE, R_OK)) {
copy_file(ALT_LAST_CONSOLE_FILE, LAST_KMSG_FILE);
}
}
return 0;
}
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