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
CacheItem(FTSENT * p)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
~CacheItem()52 CacheItem::~CacheItem() {
53 }
54
toString()55 std::string CacheItem::toString() {
56 return StringPrintf("%s size=%" PRId64 " mod=%ld", buildPath().c_str(), size, modified);
57 }
58
buildPath()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
purge()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, nullptr))) {
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