1 /*
2 * Copyright (C) 2019 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 "common/libs/utils/archive.h"
18
19 #include <unistd.h>
20
21 #include <string>
22 #include <utility>
23 #include <vector>
24
25 #include <android-base/logging.h>
26 #include <android-base/strings.h>
27
28 #include "common/libs/utils/subprocess.h"
29
30 namespace cuttlefish {
31 namespace {
32
ExtractHelper(std::vector<std::string> & files,const std::string & archive_filepath,const std::string & target_directory,const bool keep_archive)33 Result<std::vector<std::string>> ExtractHelper(
34 std::vector<std::string>& files, const std::string& archive_filepath,
35 const std::string& target_directory, const bool keep_archive) {
36 CF_EXPECT(!files.empty(), "No files extracted from " << archive_filepath);
37
38 auto it = files.begin();
39 while (it != files.end()) {
40 if (*it == "" || android::base::EndsWith(*it, "/")) {
41 it = files.erase(it);
42 } else {
43 *it = target_directory + "/" + *it;
44 it++;
45 }
46 }
47
48 if (!keep_archive && unlink(archive_filepath.data()) != 0) {
49 LOG(ERROR) << "Could not delete " << archive_filepath;
50 files.push_back(archive_filepath);
51 }
52
53 return {files};
54 }
55
56 } // namespace
57
Archive(const std::string & file)58 Archive::Archive(const std::string& file) : file_(file) {}
59
~Archive()60 Archive::~Archive() {}
61
Contents()62 std::vector<std::string> Archive::Contents() {
63 Command bsdtar_cmd("/usr/bin/bsdtar");
64 bsdtar_cmd.AddParameter("-tf");
65 bsdtar_cmd.AddParameter(file_);
66 std::string bsdtar_input, bsdtar_output;
67 auto bsdtar_ret = RunWithManagedStdio(std::move(bsdtar_cmd), &bsdtar_input,
68 &bsdtar_output, nullptr);
69 if (bsdtar_ret != 0) {
70 LOG(ERROR) << "`bsdtar -tf \"" << file_ << "\"` returned " << bsdtar_ret;
71 }
72 return bsdtar_ret == 0
73 ? android::base::Split(bsdtar_output, "\n")
74 : std::vector<std::string>();
75 }
76
ExtractAll(const std::string & target_directory)77 bool Archive::ExtractAll(const std::string& target_directory) {
78 return ExtractFiles({}, target_directory);
79 }
80
ExtractFiles(const std::vector<std::string> & to_extract,const std::string & target_directory)81 bool Archive::ExtractFiles(const std::vector<std::string>& to_extract,
82 const std::string& target_directory) {
83 Command bsdtar_cmd("/usr/bin/bsdtar");
84 bsdtar_cmd.AddParameter("-x");
85 bsdtar_cmd.AddParameter("-v");
86 bsdtar_cmd.AddParameter("-C");
87 bsdtar_cmd.AddParameter(target_directory);
88 bsdtar_cmd.AddParameter("-f");
89 bsdtar_cmd.AddParameter(file_);
90 bsdtar_cmd.AddParameter("-S");
91 for (const auto& extract : to_extract) {
92 bsdtar_cmd.AddParameter(extract);
93 }
94 bsdtar_cmd.RedirectStdIO(Subprocess::StdIOChannel::kStdOut,
95 Subprocess::StdIOChannel::kStdErr);
96 auto bsdtar_ret = bsdtar_cmd.Start().Wait();
97 if (bsdtar_ret != 0) {
98 LOG(ERROR) << "bsdtar extraction on \"" << file_ << "\" returned "
99 << bsdtar_ret;
100 }
101 return bsdtar_ret == 0;
102 }
103
ExtractToMemory(const std::string & path)104 std::string Archive::ExtractToMemory(const std::string& path) {
105 Command bsdtar_cmd("/usr/bin/bsdtar");
106 bsdtar_cmd.AddParameter("-xf");
107 bsdtar_cmd.AddParameter(file_);
108 bsdtar_cmd.AddParameter("-O");
109 bsdtar_cmd.AddParameter(path);
110 std::string stdout_str;
111 auto ret =
112 RunWithManagedStdio(std::move(bsdtar_cmd), nullptr, &stdout_str, nullptr);
113 if (ret != 0) {
114 LOG(ERROR) << "Could not extract \"" << path << "\" from \"" << file_
115 << "\" to memory.";
116 return "";
117 }
118 return stdout_str;
119 }
120
ExtractImages(const std::string & archive_filepath,const std::string & target_directory,const std::vector<std::string> & images,const bool keep_archive)121 Result<std::vector<std::string>> ExtractImages(
122 const std::string& archive_filepath, const std::string& target_directory,
123 const std::vector<std::string>& images, const bool keep_archive) {
124 Archive archive(archive_filepath);
125 CF_EXPECT(archive.ExtractFiles(images, target_directory),
126 "Could not extract images from \"" << archive_filepath << "\" to \""
127 << target_directory << "\"");
128
129 std::vector<std::string> files = images;
130 return ExtractHelper(files, archive_filepath, target_directory, keep_archive);
131 }
132
ExtractImage(const std::string & archive_filepath,const std::string & target_directory,const std::string & image,const bool keep_archive)133 Result<std::string> ExtractImage(const std::string& archive_filepath,
134 const std::string& target_directory,
135 const std::string& image,
136 const bool keep_archive) {
137 std::vector<std::string> result = CF_EXPECT(
138 ExtractImages(archive_filepath, target_directory, {image}, keep_archive));
139 return {result.front()};
140 }
141
ExtractArchiveContents(const std::string & archive_filepath,const std::string & target_directory,const bool keep_archive)142 Result<std::vector<std::string>> ExtractArchiveContents(
143 const std::string& archive_filepath, const std::string& target_directory,
144 const bool keep_archive) {
145 Archive archive(archive_filepath);
146 CF_EXPECT(archive.ExtractAll(target_directory),
147 "Could not extract \"" << archive_filepath << "\" to \""
148 << target_directory << "\"");
149
150 std::vector<std::string> files = archive.Contents();
151 return ExtractHelper(files, archive_filepath, target_directory, keep_archive);
152 }
153
154 } // namespace cuttlefish
155