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    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