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authorTianjie Xu2016-10-21 19:46:13 -0500
committerTianjie Xu2016-11-03 20:16:33 -0500
commite113e4d67fb581e7232ffe8c430b8bf4f44e08bb (patch)
tree4344cb07a28fb6ff2454d3efa672dc6bd5797a56 /rotate_logs.cpp
parent4011bb161a60fb04fb0d4c4c3e1090d43fcdd9e4 (diff)
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Cleanup the duplicates of logs rotation functions
Bug: 32067516 Test: Logs rotated successfully on angler, recovery-refresh/persist tests passed on an a/b device. Change-Id: Ie80adf0fa958ad3d7869d2d17f49489666b86c29
Diffstat (limited to 'rotate_logs.cpp')
-rw-r--r--rotate_logs.cpp115
1 files changed, 115 insertions, 0 deletions
diff --git a/rotate_logs.cpp b/rotate_logs.cpp
new file mode 100644
index 00000000..fc220215
--- /dev/null
+++ b/rotate_logs.cpp
@@ -0,0 +1,115 @@
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#include "rotate_logs.h"
18
19#include <stdio.h>
20#include <string.h>
21#include <sys/types.h>
22
23#include <string>
24
25#include <android-base/file.h>
26#include <android-base/logging.h>
27#include <android-base/parseint.h>
28#include <android-base/stringprintf.h>
29#include <private/android_logger.h> /* private pmsg functions */
30
31static const std::string LAST_KMSG_FILTER = "recovery/last_kmsg";
32static const std::string LAST_LOG_FILTER = "recovery/last_log";
33
34ssize_t logbasename(
35 log_id_t /* logId */,
36 char /* prio */,
37 const char *filename,
38 const char * /* buf */, size_t len,
39 void *arg) {
40 bool* doRotate = static_cast<bool*>(arg);
41 if (LAST_KMSG_FILTER.find(filename) != std::string::npos ||
42 LAST_LOG_FILTER.find(filename) != std::string::npos) {
43 *doRotate = true;
44 }
45 return len;
46}
47
48ssize_t logrotate(
49 log_id_t logId,
50 char prio,
51 const char *filename,
52 const char *buf, size_t len,
53 void *arg) {
54 bool* doRotate = static_cast<bool*>(arg);
55 if (!*doRotate) {
56 return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
57 }
58
59 std::string name(filename);
60 size_t dot = name.find_last_of('.');
61 std::string sub = name.substr(0, dot);
62
63 if (LAST_KMSG_FILTER.find(sub) == std::string::npos &&
64 LAST_LOG_FILTER.find(sub) == std::string::npos) {
65 return __android_log_pmsg_file_write(logId, prio, filename, buf, len);
66 }
67
68 // filename rotation
69 if (dot == std::string::npos) {
70 name += ".1";
71 } else {
72 std::string number = name.substr(dot + 1);
73 if (!isdigit(number[0])) {
74 name += ".1";
75 } else {
76 size_t i;
77 if (!android::base::ParseUint(number, &i)) {
78 LOG(ERROR) << "failed to parse uint in " << number;
79 return -1;
80 }
81 name = sub + "." + std::to_string(i + 1);
82 }
83 }
84
85 return __android_log_pmsg_file_write(logId, prio, name.c_str(), buf, len);
86}
87
88// Rename last_log -> last_log.1 -> last_log.2 -> ... -> last_log.$max.
89// Similarly rename last_kmsg -> last_kmsg.1 -> ... -> last_kmsg.$max.
90// Overwrite any existing last_log.$max and last_kmsg.$max.
91void rotate_logs(const char* last_log_file, const char* last_kmsg_file) {
92 // Logs should only be rotated once.
93 static bool rotated = false;
94 if (rotated) {
95 return;
96 }
97 rotated = true;
98
99 for (int i = KEEP_LOG_COUNT - 1; i >= 0; --i) {
100 std::string old_log = android::base::StringPrintf("%s", last_log_file);
101 if (i > 0) {
102 old_log += "." + std::to_string(i);
103 }
104 std::string new_log = android::base::StringPrintf("%s.%d", last_log_file, i+1);
105 // Ignore errors if old_log doesn't exist.
106 rename(old_log.c_str(), new_log.c_str());
107
108 std::string old_kmsg = android::base::StringPrintf("%s", last_kmsg_file);
109 if (i > 0) {
110 old_kmsg += "." + std::to_string(i);
111 }
112 std::string new_kmsg = android::base::StringPrintf("%s.%d", last_kmsg_file, i+1);
113 rename(old_kmsg.c_str(), new_kmsg.c_str());
114 }
115}