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
42 #include <string>
43
44 #include <private/android_logger.h> /* private pmsg functions */
45
46 #include "recovery_utils/logging.h"
47
main(int argc,char ** argv)48 int main(int argc, char **argv) {
49 static const char filter[] = "recovery/";
50 static const char force_rotate_flag[] = "--force-rotate";
51 static const char rotate_flag[] = "--rotate";
52 ssize_t ret;
53 bool doRotate = false;
54 // Take last pmsg contents and rewrite it to the current pmsg session.
55 if ((argc <= 1) || !argv[1] ||
56 (((doRotate = strcmp(argv[1], rotate_flag))) &&
57 strcmp(argv[1], force_rotate_flag))) {
58 doRotate = false;
59 } else if (!doRotate) {
60 // Do we need to rotate?
61 __android_log_pmsg_file_read(
62 LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
63 logbasename, &doRotate);
64 }
65
66 // Take action to refresh pmsg contents
67 ret = __android_log_pmsg_file_read(
68 LOG_ID_SYSTEM, ANDROID_LOG_INFO, filter,
69 logrotate, &doRotate);
70
71 return (ret < 0) ? ret : 0;
72 }
73