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 #define DEBUG false
17 #include "Log.h"
18
19 #include "report_directory.h"
20
21 #include <private/android_filesystem_config.h>
22 #include <utils/String8.h>
23
24 #include <dirent.h>
25 #include <libgen.h>
26 #include <sys/stat.h>
27 #include <sys/types.h>
28 #include <unistd.h>
29
30 #include <vector>
31
32 namespace android {
33 namespace os {
34 namespace incidentd {
35
stat_mtime_cmp(const std::pair<String8,struct stat> & a,const std::pair<String8,struct stat> & b)36 static bool stat_mtime_cmp(const std::pair<String8, struct stat>& a,
37 const std::pair<String8, struct stat>& b) {
38 return a.second.st_mtime < b.second.st_mtime;
39 }
40
clean_directory(const char * directory,off_t maxSize,size_t maxCount)41 void clean_directory(const char* directory, off_t maxSize, size_t maxCount) {
42 DIR* dir;
43 struct dirent* entry;
44 struct stat st;
45
46 std::vector<std::pair<String8, struct stat>> files;
47
48 if ((dir = opendir(directory)) == NULL) {
49 ALOGE("Couldn't open incident directory: %s", directory);
50 return;
51 }
52
53 String8 dirbase(directory);
54 if (directory[dirbase.size() - 1] != '/') dirbase += "/";
55
56 off_t totalSize = 0;
57 size_t totalCount = 0;
58
59 // Enumerate, count and add up size
60 while ((entry = readdir(dir)) != NULL) {
61 if (entry->d_name[0] == '.') {
62 continue;
63 }
64 String8 filename = dirbase + entry->d_name;
65 if (stat(filename.string(), &st) != 0) {
66 ALOGE("Unable to stat file %s", filename.string());
67 continue;
68 }
69 if (!S_ISREG(st.st_mode)) {
70 continue;
71 }
72 files.push_back(std::pair<String8, struct stat>(filename, st));
73
74 totalSize += st.st_size;
75 totalCount++;
76 }
77
78 closedir(dir);
79
80 // Count or size is less than max, then we're done.
81 if (totalSize < maxSize && totalCount < maxCount) {
82 return;
83 }
84
85 // Oldest files first.
86 sort(files.begin(), files.end(), stat_mtime_cmp);
87
88 // Remove files until we're under our limits.
89 for (std::vector<std::pair<String8, struct stat>>::iterator it = files.begin();
90 it != files.end() && totalSize >= maxSize && totalCount >= maxCount; it++) {
91 remove(it->first.string());
92 totalSize -= it->second.st_size;
93 totalCount--;
94 }
95 }
96
97 } // namespace incidentd
98 } // namespace os
99 } // namespace android
100