xref: /aosp_15_r20/bootable/deprecated-ota/updater/target_files.cpp (revision acea8879c968027b49a027136800575dd9783ddf)
1*acea8879SAndroid Build Coastguard Worker /*
2*acea8879SAndroid Build Coastguard Worker  * Copyright (C) 2019 The Android Open Source Project
3*acea8879SAndroid Build Coastguard Worker  *
4*acea8879SAndroid Build Coastguard Worker  * Licensed under the Apache License, Version 2.0 (the "License");
5*acea8879SAndroid Build Coastguard Worker  * you may not use this file except in compliance with the License.
6*acea8879SAndroid Build Coastguard Worker  * You may obtain a copy of the License at
7*acea8879SAndroid Build Coastguard Worker  *
8*acea8879SAndroid Build Coastguard Worker  *      http://www.apache.org/licenses/LICENSE-2.0
9*acea8879SAndroid Build Coastguard Worker  *
10*acea8879SAndroid Build Coastguard Worker  * Unless required by applicable law or agreed to in writing, software
11*acea8879SAndroid Build Coastguard Worker  * distributed under the License is distributed on an "AS IS" BASIS,
12*acea8879SAndroid Build Coastguard Worker  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13*acea8879SAndroid Build Coastguard Worker  * See the License for the specific language governing permissions and
14*acea8879SAndroid Build Coastguard Worker  * limitations under the License.
15*acea8879SAndroid Build Coastguard Worker  */
16*acea8879SAndroid Build Coastguard Worker 
17*acea8879SAndroid Build Coastguard Worker #include "updater/target_files.h"
18*acea8879SAndroid Build Coastguard Worker 
19*acea8879SAndroid Build Coastguard Worker #include <unistd.h>
20*acea8879SAndroid Build Coastguard Worker 
21*acea8879SAndroid Build Coastguard Worker #include <algorithm>
22*acea8879SAndroid Build Coastguard Worker #include <filesystem>
23*acea8879SAndroid Build Coastguard Worker #include <memory>
24*acea8879SAndroid Build Coastguard Worker 
25*acea8879SAndroid Build Coastguard Worker #include <android-base/logging.h>
26*acea8879SAndroid Build Coastguard Worker #include <android-base/strings.h>
27*acea8879SAndroid Build Coastguard Worker #include <sparse/sparse.h>
28*acea8879SAndroid Build Coastguard Worker 
SimgToImg(int input_fd,int output_fd)29*acea8879SAndroid Build Coastguard Worker static bool SimgToImg(int input_fd, int output_fd) {
30*acea8879SAndroid Build Coastguard Worker   if (lseek64(input_fd, 0, SEEK_SET) == -1) {
31*acea8879SAndroid Build Coastguard Worker     PLOG(ERROR) << "Failed to lseek64 on the input sparse image";
32*acea8879SAndroid Build Coastguard Worker     return false;
33*acea8879SAndroid Build Coastguard Worker   }
34*acea8879SAndroid Build Coastguard Worker 
35*acea8879SAndroid Build Coastguard Worker   if (lseek64(output_fd, 0, SEEK_SET) == -1) {
36*acea8879SAndroid Build Coastguard Worker     PLOG(ERROR) << "Failed to lseek64 on the output raw image";
37*acea8879SAndroid Build Coastguard Worker     return false;
38*acea8879SAndroid Build Coastguard Worker   }
39*acea8879SAndroid Build Coastguard Worker 
40*acea8879SAndroid Build Coastguard Worker   std::unique_ptr<sparse_file, decltype(&sparse_file_destroy)> s_file(
41*acea8879SAndroid Build Coastguard Worker       sparse_file_import(input_fd, true, false), sparse_file_destroy);
42*acea8879SAndroid Build Coastguard Worker   if (!s_file) {
43*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "Failed to import the sparse image.";
44*acea8879SAndroid Build Coastguard Worker     return false;
45*acea8879SAndroid Build Coastguard Worker   }
46*acea8879SAndroid Build Coastguard Worker 
47*acea8879SAndroid Build Coastguard Worker   if (sparse_file_write(s_file.get(), output_fd, false, false, false) < 0) {
48*acea8879SAndroid Build Coastguard Worker     PLOG(ERROR) << "Failed to output the raw image file.";
49*acea8879SAndroid Build Coastguard Worker     return false;
50*acea8879SAndroid Build Coastguard Worker   }
51*acea8879SAndroid Build Coastguard Worker 
52*acea8879SAndroid Build Coastguard Worker   return true;
53*acea8879SAndroid Build Coastguard Worker }
54*acea8879SAndroid Build Coastguard Worker 
ParsePropertyFile(const std::string_view prop_content,std::map<std::string,std::string,std::less<>> * props_map)55*acea8879SAndroid Build Coastguard Worker static bool ParsePropertyFile(const std::string_view prop_content,
56*acea8879SAndroid Build Coastguard Worker                               std::map<std::string, std::string, std::less<>>* props_map) {
57*acea8879SAndroid Build Coastguard Worker   LOG(INFO) << "Start parsing build property\n";
58*acea8879SAndroid Build Coastguard Worker   std::vector<std::string> lines = android::base::Split(std::string(prop_content), "\n");
59*acea8879SAndroid Build Coastguard Worker   for (const auto& line : lines) {
60*acea8879SAndroid Build Coastguard Worker     if (line.empty() || line[0] == '#') continue;
61*acea8879SAndroid Build Coastguard Worker     auto pos = line.find('=');
62*acea8879SAndroid Build Coastguard Worker     if (pos == std::string::npos) continue;
63*acea8879SAndroid Build Coastguard Worker     std::string key = line.substr(0, pos);
64*acea8879SAndroid Build Coastguard Worker     std::string value = line.substr(pos + 1);
65*acea8879SAndroid Build Coastguard Worker     LOG(INFO) << key << ": " << value;
66*acea8879SAndroid Build Coastguard Worker     props_map->emplace(key, value);
67*acea8879SAndroid Build Coastguard Worker   }
68*acea8879SAndroid Build Coastguard Worker 
69*acea8879SAndroid Build Coastguard Worker   return true;
70*acea8879SAndroid Build Coastguard Worker }
71*acea8879SAndroid Build Coastguard Worker 
ParseFstab(const std::string_view fstab,std::vector<FstabInfo> * fstab_info_list)72*acea8879SAndroid Build Coastguard Worker static bool ParseFstab(const std::string_view fstab, std::vector<FstabInfo>* fstab_info_list) {
73*acea8879SAndroid Build Coastguard Worker   LOG(INFO) << "parsing fstab\n";
74*acea8879SAndroid Build Coastguard Worker   std::vector<std::string> lines = android::base::Split(std::string(fstab), "\n");
75*acea8879SAndroid Build Coastguard Worker   for (const auto& line : lines) {
76*acea8879SAndroid Build Coastguard Worker     if (line.empty() || line[0] == '#') continue;
77*acea8879SAndroid Build Coastguard Worker 
78*acea8879SAndroid Build Coastguard Worker     // <block_device>  <mount_point>  <fs_type>  <mount_flags>  optional:<fs_mgr_flags>
79*acea8879SAndroid Build Coastguard Worker     std::vector<std::string> tokens = android::base::Split(line, " ");
80*acea8879SAndroid Build Coastguard Worker     tokens.erase(std::remove(tokens.begin(), tokens.end(), ""), tokens.end());
81*acea8879SAndroid Build Coastguard Worker     if (tokens.size() != 4 && tokens.size() != 5) {
82*acea8879SAndroid Build Coastguard Worker       LOG(ERROR) << "Unexpected token size: " << tokens.size() << std::endl
83*acea8879SAndroid Build Coastguard Worker                  << "Error parsing fstab line: " << line;
84*acea8879SAndroid Build Coastguard Worker       return false;
85*acea8879SAndroid Build Coastguard Worker     }
86*acea8879SAndroid Build Coastguard Worker 
87*acea8879SAndroid Build Coastguard Worker     const auto& blockdev = tokens[0];
88*acea8879SAndroid Build Coastguard Worker     const auto& mount_point = tokens[1];
89*acea8879SAndroid Build Coastguard Worker     const auto& fs_type = tokens[2];
90*acea8879SAndroid Build Coastguard Worker     if (!android::base::StartsWith(mount_point, "/")) {
91*acea8879SAndroid Build Coastguard Worker       LOG(WARNING) << "mount point '" << mount_point << "' does not start with '/'";
92*acea8879SAndroid Build Coastguard Worker       continue;
93*acea8879SAndroid Build Coastguard Worker     }
94*acea8879SAndroid Build Coastguard Worker 
95*acea8879SAndroid Build Coastguard Worker     // The simulator only supports ext4 and emmc for now.
96*acea8879SAndroid Build Coastguard Worker     if (fs_type != "ext4" && fs_type != "emmc") {
97*acea8879SAndroid Build Coastguard Worker       LOG(WARNING) << "Unsupported fs_type in " << line;
98*acea8879SAndroid Build Coastguard Worker       continue;
99*acea8879SAndroid Build Coastguard Worker     }
100*acea8879SAndroid Build Coastguard Worker 
101*acea8879SAndroid Build Coastguard Worker     fstab_info_list->emplace_back(blockdev, mount_point, fs_type);
102*acea8879SAndroid Build Coastguard Worker   }
103*acea8879SAndroid Build Coastguard Worker 
104*acea8879SAndroid Build Coastguard Worker   return true;
105*acea8879SAndroid Build Coastguard Worker }
106*acea8879SAndroid Build Coastguard Worker 
EntryExists(const std::string_view name) const107*acea8879SAndroid Build Coastguard Worker bool TargetFile::EntryExists(const std::string_view name) const {
108*acea8879SAndroid Build Coastguard Worker   if (extracted_input_) {
109*acea8879SAndroid Build Coastguard Worker     std::string entry_path = path_ + "/" + std::string(name);
110*acea8879SAndroid Build Coastguard Worker     if (access(entry_path.c_str(), O_RDONLY) != 0) {
111*acea8879SAndroid Build Coastguard Worker       PLOG(WARNING) << "Failed to access " << entry_path;
112*acea8879SAndroid Build Coastguard Worker       return false;
113*acea8879SAndroid Build Coastguard Worker     }
114*acea8879SAndroid Build Coastguard Worker     return true;
115*acea8879SAndroid Build Coastguard Worker   }
116*acea8879SAndroid Build Coastguard Worker 
117*acea8879SAndroid Build Coastguard Worker   CHECK(handle_);
118*acea8879SAndroid Build Coastguard Worker   ZipEntry64 img_entry;
119*acea8879SAndroid Build Coastguard Worker   return FindEntry(handle_, name, &img_entry) == 0;
120*acea8879SAndroid Build Coastguard Worker }
121*acea8879SAndroid Build Coastguard Worker 
ReadEntryToString(const std::string_view name,std::string * content) const122*acea8879SAndroid Build Coastguard Worker bool TargetFile::ReadEntryToString(const std::string_view name, std::string* content) const {
123*acea8879SAndroid Build Coastguard Worker   if (extracted_input_) {
124*acea8879SAndroid Build Coastguard Worker     std::string entry_path = path_ + "/" + std::string(name);
125*acea8879SAndroid Build Coastguard Worker     return android::base::ReadFileToString(entry_path, content);
126*acea8879SAndroid Build Coastguard Worker   }
127*acea8879SAndroid Build Coastguard Worker 
128*acea8879SAndroid Build Coastguard Worker   CHECK(handle_);
129*acea8879SAndroid Build Coastguard Worker   ZipEntry64 entry;
130*acea8879SAndroid Build Coastguard Worker   if (auto find_err = FindEntry(handle_, name, &entry); find_err != 0) {
131*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "failed to find " << name << " in the package: " << ErrorCodeString(find_err);
132*acea8879SAndroid Build Coastguard Worker     return false;
133*acea8879SAndroid Build Coastguard Worker   }
134*acea8879SAndroid Build Coastguard Worker 
135*acea8879SAndroid Build Coastguard Worker   if (entry.uncompressed_length == 0) {
136*acea8879SAndroid Build Coastguard Worker     content->clear();
137*acea8879SAndroid Build Coastguard Worker     return true;
138*acea8879SAndroid Build Coastguard Worker   }
139*acea8879SAndroid Build Coastguard Worker 
140*acea8879SAndroid Build Coastguard Worker   if (entry.uncompressed_length > std::numeric_limits<size_t>::max()) {
141*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "Failed to extract " << name
142*acea8879SAndroid Build Coastguard Worker                << " because's uncompressed size exceeds size of address space. "
143*acea8879SAndroid Build Coastguard Worker                << entry.uncompressed_length;
144*acea8879SAndroid Build Coastguard Worker     return false;
145*acea8879SAndroid Build Coastguard Worker   }
146*acea8879SAndroid Build Coastguard Worker 
147*acea8879SAndroid Build Coastguard Worker   content->resize(entry.uncompressed_length);
148*acea8879SAndroid Build Coastguard Worker   if (auto extract_err = ExtractToMemory(
149*acea8879SAndroid Build Coastguard Worker           handle_, &entry, reinterpret_cast<uint8_t*>(&content->at(0)), entry.uncompressed_length);
150*acea8879SAndroid Build Coastguard Worker       extract_err != 0) {
151*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "failed to read " << name << " from package: " << ErrorCodeString(extract_err);
152*acea8879SAndroid Build Coastguard Worker     return false;
153*acea8879SAndroid Build Coastguard Worker   }
154*acea8879SAndroid Build Coastguard Worker 
155*acea8879SAndroid Build Coastguard Worker   return true;
156*acea8879SAndroid Build Coastguard Worker }
157*acea8879SAndroid Build Coastguard Worker 
ExtractEntryToTempFile(const std::string_view name,TemporaryFile * temp_file) const158*acea8879SAndroid Build Coastguard Worker bool TargetFile::ExtractEntryToTempFile(const std::string_view name,
159*acea8879SAndroid Build Coastguard Worker                                         TemporaryFile* temp_file) const {
160*acea8879SAndroid Build Coastguard Worker   if (extracted_input_) {
161*acea8879SAndroid Build Coastguard Worker     std::string entry_path = path_ + "/" + std::string(name);
162*acea8879SAndroid Build Coastguard Worker     return std::filesystem::copy_file(entry_path, temp_file->path,
163*acea8879SAndroid Build Coastguard Worker                                       std::filesystem::copy_options::overwrite_existing);
164*acea8879SAndroid Build Coastguard Worker   }
165*acea8879SAndroid Build Coastguard Worker 
166*acea8879SAndroid Build Coastguard Worker   CHECK(handle_);
167*acea8879SAndroid Build Coastguard Worker   ZipEntry64 entry;
168*acea8879SAndroid Build Coastguard Worker   if (auto find_err = FindEntry(handle_, name, &entry); find_err != 0) {
169*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "failed to find " << name << " in the package: " << ErrorCodeString(find_err);
170*acea8879SAndroid Build Coastguard Worker     return false;
171*acea8879SAndroid Build Coastguard Worker   }
172*acea8879SAndroid Build Coastguard Worker 
173*acea8879SAndroid Build Coastguard Worker   if (auto status = ExtractEntryToFile(handle_, &entry, temp_file->fd); status != 0) {
174*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "Failed to extract zip entry " << name << " : " << ErrorCodeString(status);
175*acea8879SAndroid Build Coastguard Worker     return false;
176*acea8879SAndroid Build Coastguard Worker   }
177*acea8879SAndroid Build Coastguard Worker   return true;
178*acea8879SAndroid Build Coastguard Worker }
179*acea8879SAndroid Build Coastguard Worker 
Open()180*acea8879SAndroid Build Coastguard Worker bool TargetFile::Open() {
181*acea8879SAndroid Build Coastguard Worker   if (!extracted_input_) {
182*acea8879SAndroid Build Coastguard Worker     if (auto ret = OpenArchive(path_.c_str(), &handle_); ret != 0) {
183*acea8879SAndroid Build Coastguard Worker       LOG(ERROR) << "failed to open source target file " << path_ << ": " << ErrorCodeString(ret);
184*acea8879SAndroid Build Coastguard Worker       return false;
185*acea8879SAndroid Build Coastguard Worker     }
186*acea8879SAndroid Build Coastguard Worker   }
187*acea8879SAndroid Build Coastguard Worker 
188*acea8879SAndroid Build Coastguard Worker   // Parse the misc info.
189*acea8879SAndroid Build Coastguard Worker   std::string misc_info_content;
190*acea8879SAndroid Build Coastguard Worker   if (!ReadEntryToString("META/misc_info.txt", &misc_info_content)) {
191*acea8879SAndroid Build Coastguard Worker     return false;
192*acea8879SAndroid Build Coastguard Worker   }
193*acea8879SAndroid Build Coastguard Worker   if (!ParsePropertyFile(misc_info_content, &misc_info_)) {
194*acea8879SAndroid Build Coastguard Worker     return false;
195*acea8879SAndroid Build Coastguard Worker   }
196*acea8879SAndroid Build Coastguard Worker 
197*acea8879SAndroid Build Coastguard Worker   return true;
198*acea8879SAndroid Build Coastguard Worker }
199*acea8879SAndroid Build Coastguard Worker 
GetBuildProps(std::map<std::string,std::string,std::less<>> * props_map) const200*acea8879SAndroid Build Coastguard Worker bool TargetFile::GetBuildProps(std::map<std::string, std::string, std::less<>>* props_map) const {
201*acea8879SAndroid Build Coastguard Worker   props_map->clear();
202*acea8879SAndroid Build Coastguard Worker   // Parse the source zip to mock the system props and block devices. We try all the possible
203*acea8879SAndroid Build Coastguard Worker   // locations for build props.
204*acea8879SAndroid Build Coastguard Worker   constexpr std::string_view kPropLocations[] = {
205*acea8879SAndroid Build Coastguard Worker     "SYSTEM/build.prop",
206*acea8879SAndroid Build Coastguard Worker     "VENDOR/build.prop",
207*acea8879SAndroid Build Coastguard Worker     "PRODUCT/build.prop",
208*acea8879SAndroid Build Coastguard Worker     "SYSTEM_EXT/build.prop",
209*acea8879SAndroid Build Coastguard Worker     "SYSTEM/vendor/build.prop",
210*acea8879SAndroid Build Coastguard Worker     "SYSTEM/product/build.prop",
211*acea8879SAndroid Build Coastguard Worker     "SYSTEM/system_ext/build.prop",
212*acea8879SAndroid Build Coastguard Worker     "ODM/build.prop",  // legacy
213*acea8879SAndroid Build Coastguard Worker     "ODM/etc/build.prop",
214*acea8879SAndroid Build Coastguard Worker     "VENDOR/odm/build.prop",  // legacy
215*acea8879SAndroid Build Coastguard Worker     "VENDOR/odm/etc/build.prop",
216*acea8879SAndroid Build Coastguard Worker   };
217*acea8879SAndroid Build Coastguard Worker   for (const auto& name : kPropLocations) {
218*acea8879SAndroid Build Coastguard Worker     std::string build_prop_content;
219*acea8879SAndroid Build Coastguard Worker     if (!ReadEntryToString(name, &build_prop_content)) {
220*acea8879SAndroid Build Coastguard Worker       continue;
221*acea8879SAndroid Build Coastguard Worker     }
222*acea8879SAndroid Build Coastguard Worker     std::map<std::string, std::string, std::less<>> props;
223*acea8879SAndroid Build Coastguard Worker     if (!ParsePropertyFile(build_prop_content, &props)) {
224*acea8879SAndroid Build Coastguard Worker       LOG(ERROR) << "Failed to parse build prop in " << name;
225*acea8879SAndroid Build Coastguard Worker       return false;
226*acea8879SAndroid Build Coastguard Worker     }
227*acea8879SAndroid Build Coastguard Worker     for (const auto& [key, value] : props) {
228*acea8879SAndroid Build Coastguard Worker       if (auto it = props_map->find(key); it != props_map->end() && it->second != value) {
229*acea8879SAndroid Build Coastguard Worker         LOG(WARNING) << "Property " << key << " has different values in property files, we got "
230*acea8879SAndroid Build Coastguard Worker                      << it->second << " and " << value;
231*acea8879SAndroid Build Coastguard Worker       }
232*acea8879SAndroid Build Coastguard Worker       props_map->emplace(key, value);
233*acea8879SAndroid Build Coastguard Worker     }
234*acea8879SAndroid Build Coastguard Worker   }
235*acea8879SAndroid Build Coastguard Worker 
236*acea8879SAndroid Build Coastguard Worker   return true;
237*acea8879SAndroid Build Coastguard Worker }
238*acea8879SAndroid Build Coastguard Worker 
ExtractImage(const std::string_view entry_name,const FstabInfo & fstab_info,const std::string_view work_dir,TemporaryFile * image_file) const239*acea8879SAndroid Build Coastguard Worker bool TargetFile::ExtractImage(const std::string_view entry_name, const FstabInfo& fstab_info,
240*acea8879SAndroid Build Coastguard Worker                               const std::string_view work_dir, TemporaryFile* image_file) const {
241*acea8879SAndroid Build Coastguard Worker   if (!EntryExists(entry_name)) {
242*acea8879SAndroid Build Coastguard Worker     return false;
243*acea8879SAndroid Build Coastguard Worker   }
244*acea8879SAndroid Build Coastguard Worker 
245*acea8879SAndroid Build Coastguard Worker   // We don't need extra work for 'emmc'; use the image file as the block device.
246*acea8879SAndroid Build Coastguard Worker   if (fstab_info.fs_type == "emmc" || misc_info_.find("extfs_sparse_flag") == misc_info_.end()) {
247*acea8879SAndroid Build Coastguard Worker     if (!ExtractEntryToTempFile(entry_name, image_file)) {
248*acea8879SAndroid Build Coastguard Worker       return false;
249*acea8879SAndroid Build Coastguard Worker     }
250*acea8879SAndroid Build Coastguard Worker   } else {  // treated as ext4 sparse image
251*acea8879SAndroid Build Coastguard Worker     TemporaryFile sparse_image{ std::string(work_dir) };
252*acea8879SAndroid Build Coastguard Worker     if (!ExtractEntryToTempFile(entry_name, &sparse_image)) {
253*acea8879SAndroid Build Coastguard Worker       return false;
254*acea8879SAndroid Build Coastguard Worker     }
255*acea8879SAndroid Build Coastguard Worker 
256*acea8879SAndroid Build Coastguard Worker     // Convert the sparse image to raw.
257*acea8879SAndroid Build Coastguard Worker     if (!SimgToImg(sparse_image.fd, image_file->fd)) {
258*acea8879SAndroid Build Coastguard Worker       LOG(ERROR) << "Failed to convert " << fstab_info.mount_point << " to raw.";
259*acea8879SAndroid Build Coastguard Worker       return false;
260*acea8879SAndroid Build Coastguard Worker     }
261*acea8879SAndroid Build Coastguard Worker   }
262*acea8879SAndroid Build Coastguard Worker 
263*acea8879SAndroid Build Coastguard Worker   return true;
264*acea8879SAndroid Build Coastguard Worker }
265*acea8879SAndroid Build Coastguard Worker 
ParseFstabInfo(std::vector<FstabInfo> * fstab_info_list) const266*acea8879SAndroid Build Coastguard Worker bool TargetFile::ParseFstabInfo(std::vector<FstabInfo>* fstab_info_list) const {
267*acea8879SAndroid Build Coastguard Worker   // Parse the fstab file and extract the image files. The location of the fstab actually depends
268*acea8879SAndroid Build Coastguard Worker   // on some flags e.g. "no_recovery", "recovery_as_boot". Here we just try all possibilities.
269*acea8879SAndroid Build Coastguard Worker   constexpr std::string_view kRecoveryFstabLocations[] = {
270*acea8879SAndroid Build Coastguard Worker     "RECOVERY/RAMDISK/system/etc/recovery.fstab",
271*acea8879SAndroid Build Coastguard Worker     "RECOVERY/RAMDISK/etc/recovery.fstab",
272*acea8879SAndroid Build Coastguard Worker     "BOOT/RAMDISK/system/etc/recovery.fstab",
273*acea8879SAndroid Build Coastguard Worker     "BOOT/RAMDISK/etc/recovery.fstab",
274*acea8879SAndroid Build Coastguard Worker   };
275*acea8879SAndroid Build Coastguard Worker   std::string fstab_content;
276*acea8879SAndroid Build Coastguard Worker   for (const auto& name : kRecoveryFstabLocations) {
277*acea8879SAndroid Build Coastguard Worker     if (std::string content; ReadEntryToString(name, &content)) {
278*acea8879SAndroid Build Coastguard Worker       fstab_content = std::move(content);
279*acea8879SAndroid Build Coastguard Worker       break;
280*acea8879SAndroid Build Coastguard Worker     }
281*acea8879SAndroid Build Coastguard Worker   }
282*acea8879SAndroid Build Coastguard Worker   if (fstab_content.empty()) {
283*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "Failed to parse the recovery fstab file";
284*acea8879SAndroid Build Coastguard Worker     return false;
285*acea8879SAndroid Build Coastguard Worker   }
286*acea8879SAndroid Build Coastguard Worker 
287*acea8879SAndroid Build Coastguard Worker   // Extract the images and convert them to raw.
288*acea8879SAndroid Build Coastguard Worker   if (!ParseFstab(fstab_content, fstab_info_list)) {
289*acea8879SAndroid Build Coastguard Worker     LOG(ERROR) << "Failed to mount the block devices for source build.";
290*acea8879SAndroid Build Coastguard Worker     return false;
291*acea8879SAndroid Build Coastguard Worker   }
292*acea8879SAndroid Build Coastguard Worker 
293*acea8879SAndroid Build Coastguard Worker   return true;
294*acea8879SAndroid Build Coastguard Worker }
295