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      1 /*
      2  * Copyright (C) 2017 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 "CacheItem.h"
     18 
     19 #include <inttypes.h>
     20 #include <stdint.h>
     21 #include <sys/xattr.h>
     22 
     23 #include <android-base/logging.h>
     24 #include <android-base/stringprintf.h>
     25 
     26 #include "utils.h"
     27 
     28 using android::base::StringPrintf;
     29 
     30 namespace android {
     31 namespace installd {
     32 
     33 CacheItem::CacheItem(FTSENT* p) {
     34     level = p->fts_level;
     35     directory = S_ISDIR(p->fts_statp->st_mode);
     36     size = p->fts_statp->st_blocks * 512;
     37     modified = p->fts_statp->st_mtime;
     38 
     39     mParent = static_cast<CacheItem*>(p->fts_parent->fts_pointer);
     40     if (mParent) {
     41         group = mParent->group;
     42         tombstone = mParent->tombstone;
     43         mName = p->fts_name;
     44         mName.insert(0, "/");
     45     } else {
     46         group = false;
     47         tombstone = false;
     48         mName = p->fts_path;
     49     }
     50 }
     51 
     52 CacheItem::~CacheItem() {
     53 }
     54 
     55 std::string CacheItem::toString() {
     56     return StringPrintf("%s size=%" PRId64 " mod=%ld", buildPath().c_str(), size, modified);
     57 }
     58 
     59 std::string CacheItem::buildPath() {
     60     std::string res = mName;
     61     CacheItem* parent = mParent;
     62     while (parent) {
     63         res.insert(0, parent->mName);
     64         parent = parent->mParent;
     65     }
     66     return res;
     67 }
     68 
     69 int CacheItem::purge() {
     70     int res = 0;
     71     auto path = buildPath();
     72     if (directory) {
     73         FTS *fts;
     74         FTSENT *p;
     75         char *argv[] = { (char*) path.c_str(), nullptr };
     76         if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
     77             PLOG(WARNING) << "Failed to fts_open " << path;
     78             return -1;
     79         }
     80         while ((p = fts_read(fts)) != nullptr) {
     81             switch (p->fts_info) {
     82             case FTS_D:
     83                 if (p->fts_level == 0) {
     84                     p->fts_number = tombstone;
     85                 } else {
     86                     p->fts_number = p->fts_parent->fts_number
     87                             | (getxattr(p->fts_path, kXattrCacheTombstone, nullptr, 0) >= 0);
     88                 }
     89                 break;
     90             case FTS_F:
     91                 if (p->fts_parent->fts_number) {
     92                     if (truncate(p->fts_path, 0) != 0) {
     93                         PLOG(WARNING) << "Failed to truncate " << p->fts_path;
     94                         res = -1;
     95                     }
     96                 } else {
     97                     if (unlink(p->fts_path) != 0) {
     98                         PLOG(WARNING) << "Failed to unlink " << p->fts_path;
     99                         res = -1;
    100                     }
    101                 }
    102                 break;
    103             case FTS_DEFAULT:
    104             case FTS_SL:
    105             case FTS_SLNONE:
    106                 if (unlink(p->fts_path) != 0) {
    107                     PLOG(WARNING) << "Failed to unlink " << p->fts_path;
    108                     res = -1;
    109                 }
    110                 break;
    111             case FTS_DP:
    112                 if (rmdir(p->fts_path) != 0) {
    113                     PLOG(WARNING) << "Failed to rmdir " << p->fts_path;
    114                     res = -1;
    115                 }
    116                 break;
    117             }
    118         }
    119     } else {
    120         if (tombstone) {
    121             if (truncate(path.c_str(), 0) != 0) {
    122                 PLOG(WARNING) << "Failed to truncate " << path;
    123                 res = -1;
    124             }
    125         } else {
    126             if (unlink(path.c_str()) != 0) {
    127                 PLOG(WARNING) << "Failed to unlink " << path;
    128                 res = -1;
    129             }
    130         }
    131     }
    132     return res;
    133 }
    134 
    135 }  // namespace installd
    136 }  // namespace android
    137