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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //
     18 // Strictly to deal with reboot into system after OTA, then
     19 // reboot while in system before boot complete landing us back
     20 // into recovery to continue with any mitigations with retained
     21 // log history. This simply refreshes the pmsg files from
     22 // the last pmsg file contents.
     23 //
     24 // Usage:
     25 //    recovery-refresh [--force-rotate|--rotate]
     26 //
     27 //    All file content representing in the recovery/ directory stored in
     28 //    /sys/fs/pstore/pmsg-ramoops-0 in logger format that reside in the
     29 //    LOG_ID_SYSTEM buffer at ANDROID_LOG_INFO priority or higher is
     30 //    refreshed into /dev/pmsg0. This ensures that an unexpected reboot
     31 //    before recovery-persist is run will still contain the associated
     32 //    pmsg Android Logger content.
     33 //
     34 //    --force-rotate  recovery/last_kmsg and recovery.last_log files are
     35 //                    rotated with .<number> suffixes upwards.
     36 //    --rotate        rotated only if rocovery/last_msg or recovery/last_log
     37 //                    exist, otherwise perform 1:1 refresh.
     38 //
     39 
     40 #include <string.h>
     41 #include <string>
     42 
     43 #include <private/android_logger.h> /* private pmsg functions */
     44 
     45 #include "otautil/logging.h"
     46 
     47 int main(int argc, char **argv) {
     48     static const char filter[] = "recovery/";
     49     static const char force_rotate_flag[] = "--force-rotate";
     50     static const char rotate_flag[] = "--rotate";
     51     ssize_t ret;
     52     bool doRotate = false;
     53     // Take last pmsg contents and rewrite it to the current pmsg session.
     54     if ((argc <= 1) || !argv[1] ||
     55             (((doRotate = strcmp(argv[1], rotate_flag))) &&
     56                 strcmp(argv[1], force_rotate_flag))) {
     57         doRotate = false;
     58     } else if (!doRotate) {
     59         // Do we need to rotate?
     60         __android_log_pmsg_file_read(
     61             LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
     62             logbasename, &doRotate);
     63     }
     64 
     65     // Take action to refresh pmsg contents
     66     ret = __android_log_pmsg_file_read(
     67         LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
     68         logrotate, &doRotate);
     69 
     70     return (ret < 0) ? ret : 0;
     71 }
     72