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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.
*/
#define LOG_TAG "recovery-refresh"
//
// Strictly to deal with reboot into system after OTA, then
// reboot while in system before boot complete landing us back
// into recovery to continue with any mitigations with retained
// log history. This simply refreshes the pmsg files from
// the last pmsg file contents.
//
// Usage:
// recovery-refresh [--force-rotate|--rotate]
//
// 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
// refreshed into /dev/pmsg0. This ensures that an unexpected reboot
// before recovery-persist is run will still contain the associated
// pmsg Android Logger content.
//
// --force-rotate recovery/last_kmsg and recovery.last_log files are
// rotated with .<number> suffixes upwards.
// --rotate rotated only if rocovery/last_msg or recovery/last_log
// exist, otherwise perform 1:1 refresh.
//
#include <string.h>
#include <string>
#include <android/log.h> /* Android Log Priority Tags */
#include <private/android_logger.h> /* private pmsg functions */
static const char LAST_KMSG_FILE[] = "recovery/last_kmsg";
static const char LAST_LOG_FILE[] = "recovery/last_log";
static ssize_t logbasename(
log_id_t /* logId */,
char /* prio */,
const char *filename,
const char * /* buf */, size_t len,
void *arg) {
if (strstr(LAST_KMSG_FILE, filename) ||
strstr(LAST_LOG_FILE, filename)) {
bool *doRotate = reinterpret_cast<bool *>(arg);
*doRotate = true;
}
return len;
}
static ssize_t logrotate(
log_id_t logId,
char prio,
const char *filename,
const char *buf, size_t len,
void *arg) {
bool *doRotate = reinterpret_cast<bool *>(arg);
if (!*doRotate) {
return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
}
std::string name(filename);
size_t dot = name.find_last_of('.');
std::string sub = name.substr(0, dot);
if (!strstr(LAST_KMSG_FILE, sub.c_str()) &&
!strstr(LAST_LOG_FILE, sub.c_str())) {
return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
}
// filename rotation
if (dot == std::string::npos) {
name += ".1";
} else {
std::string number = name.substr(dot + 1);
if (!isdigit(number.data()[0])) {
name += ".1";
} else {
auto i = std::stoull(number);
name = sub + "." + std::to_string(i + 1);
}
}
return __android_log_pmsg_file_write(logId, prio, name.c_str(), buf, len);
}
int main(int argc, char **argv) {
static const char filter[] = "recovery/";
static const char force_rotate_flag[] = "--force-rotate";
static const char rotate_flag[] = "--rotate";
ssize_t ret;
bool doRotate = false;
// Take last pmsg contents and rewrite it to the current pmsg session.
if ((argc <= 1) || !argv[1] ||
(((doRotate = strcmp(argv[1], rotate_flag))) &&
strcmp(argv[1], force_rotate_flag))) {
doRotate = false;
} else if (!doRotate) {
// Do we need to rotate?
__android_log_pmsg_file_read(
LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
logbasename, &doRotate);
}
// Take action to refresh pmsg contents
ret = __android_log_pmsg_file_read(
LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
logrotate, &doRotate);
return (ret < 0) ? ret : 0;
}
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