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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 #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 
     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 
     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