CacheItem.cpp revision ed909ae8db2f44ce7fe7003c6fee457f13669702 
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
28using android::base::StringPrintf;
29
30namespace android {
31namespace installd {
32
33CacheItem::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
52CacheItem::~CacheItem() {
53}
54
55std::string CacheItem::toString() {
56    return StringPrintf("%s size=%" PRId64 " mod=%ld", buildPath().c_str(), size, modified);
57}
58
59std::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
69int CacheItem::purge() {
70    auto path = buildPath();
71    if (directory) {
72        FTS *fts;
73        FTSENT *p;
74        char *argv[] = { (char*) path.c_str(), nullptr };
75        if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
76            PLOG(WARNING) << "Failed to fts_open " << path;
77            return -1;
78        }
79        while ((p = fts_read(fts)) != nullptr) {
80            switch (p->fts_info) {
81            case FTS_D:
82                if (p->fts_level == 0) {
83                    p->fts_number = tombstone;
84                } else {
85                    p->fts_number = p->fts_parent->fts_number
86                            | (getxattr(p->fts_path, kXattrCacheTombstone, nullptr, 0) >= 0);
87                }
88                break;
89            case FTS_F:
90                if (p->fts_parent->fts_number) {
91                    truncate(p->fts_path, 0);
92                } else {
93                    unlink(p->fts_path);
94                }
95                break;
96            case FTS_DEFAULT:
97            case FTS_SL:
98            case FTS_SLNONE:
99                unlink(p->fts_path);
100                break;
101            case FTS_DP:
102                rmdir(p->fts_path);
103                break;
104            }
105        }
106        return 0;
107    } else {
108        if (tombstone) {
109            return truncate(path.c_str(), 0);
110        } else {
111            return unlink(path.c_str());
112        }
113    }
114}
115
116}  // namespace installd
117}  // namespace android
118