install.cpp - android_bootable_recovery - Gitiles

 /*
  * Copyright (C) 2007 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>

 #include <chrono>
 #include <string>
 #include <vector>

 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/parseint.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <ziparchive/zip_archive.h>

 #include "common.h"
 #include "error_code.h"
 #include "install.h"
 #include "minui/minui.h"
 #include "otautil/SysUtil.h"
 #include "roots.h"
 #include "ui.h"
 #include "verifier.h"

 #define ASSUMED_UPDATE_BINARY_NAME  "META-INF/com/google/android/update-binary"
 #define PUBLIC_KEYS_FILE "/res/keys"
 static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata";
 static constexpr const char* UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";

 // Default allocation of progress bar segments to operations
 static const int VERIFICATION_PROGRESS_TIME = 60;
 static const float VERIFICATION_PROGRESS_FRACTION = 0.25;
 static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4;
 static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1;

 // This function parses and returns the build.version.incremental
 static int parse_build_number(const std::string& str) {
     size_t pos = str.find('=');
     if (pos != std::string::npos) {
         std::string num_string = android::base::Trim(str.substr(pos+1));
         int build_number;
         if (android::base::ParseInt(num_string.c_str(), &build_number, 0)) {
             return build_number;
         }
     }

     LOG(ERROR) << "Failed to parse build number in " << str;
     return -1;
 }

 bool read_metadata_from_package(ZipArchiveHandle zip, std::string* meta_data) {
     ZipString metadata_path(METADATA_PATH);
     ZipEntry meta_entry;
     if (meta_data == nullptr) {
         LOG(ERROR) << "string* meta_data can't be nullptr";
         return false;
     }
     if (FindEntry(zip, metadata_path, &meta_entry) != 0) {
         LOG(ERROR) << "Failed to find " << METADATA_PATH << " in update package";
         return false;
     }

     meta_data->resize(meta_entry.uncompressed_length, '\0');
     if (ExtractToMemory(zip, &meta_entry, reinterpret_cast<uint8_t*>(&(*meta_data)[0]),
                         meta_entry.uncompressed_length) != 0) {
         LOG(ERROR) << "Failed to read metadata in update package";
         return false;
     }
     return true;
 }

 // Read the build.version.incremental of src/tgt from the metadata and log it to last_install.
 static void read_source_target_build(ZipArchiveHandle zip, std::vector<std::string>& log_buffer) {
     std::string meta_data;
     if (!read_metadata_from_package(zip, &meta_data)) {
         return;
     }
     // Examples of the pre-build and post-build strings in metadata:
     // pre-build-incremental=2943039
     // post-build-incremental=2951741
     std::vector<std::string> lines = android::base::Split(meta_data, "\n");
     for (const std::string& line : lines) {
         std::string str = android::base::Trim(line);
         if (android::base::StartsWith(str, "pre-build-incremental")){
             int source_build = parse_build_number(str);
             if (source_build != -1) {
                 log_buffer.push_back(android::base::StringPrintf("source_build: %d",
                         source_build));
             }
         } else if (android::base::StartsWith(str, "post-build-incremental")) {
             int target_build = parse_build_number(str);
             if (target_build != -1) {
                 log_buffer.push_back(android::base::StringPrintf("target_build: %d",
                         target_build));
             }
         }
     }
 }

 // If the package contains an update binary, extract it and run it.
 static int
 try_update_binary(const char* path, ZipArchiveHandle zip, bool* wipe_cache,
                   std::vector<std::string>& log_buffer, int retry_count)
 {
     read_source_target_build(zip, log_buffer);

     ZipString binary_name(ASSUMED_UPDATE_BINARY_NAME);
     ZipEntry binary_entry;
     if (FindEntry(zip, binary_name, &binary_entry) != 0) {
         return INSTALL_CORRUPT;
     }

     const char* binary = "/tmp/update_binary";
     unlink(binary);
     int fd = creat(binary, 0755);
     if (fd < 0) {
         PLOG(ERROR) << "Can't make " << binary;
         return INSTALL_ERROR;
     }
     int error = ExtractEntryToFile(zip, &binary_entry, fd);
     close(fd);

     if (error != 0) {
         LOG(ERROR) << "Can't copy " << ASSUMED_UPDATE_BINARY_NAME
                    << " : " << ErrorCodeString(error);
         return INSTALL_ERROR;
     }

     int pipefd[2];
     pipe(pipefd);

     // When executing the update binary contained in the package, the
     // arguments passed are:
     //
     //   - the version number for this interface
     //
     //   - an fd to which the program can write in order to update the
     //     progress bar.  The program can write single-line commands:
     //
     //        progress <frac> <secs>
     //            fill up the next <frac> part of of the progress bar
     //            over <secs> seconds.  If <secs> is zero, use
     //            set_progress commands to manually control the
     //            progress of this segment of the bar.
     //
     //        set_progress <frac>
     //            <frac> should be between 0.0 and 1.0; sets the
     //            progress bar within the segment defined by the most
     //            recent progress command.
     //
     //        firmware <"hboot"|"radio"> <filename>
     //            arrange to install the contents of <filename> in the
     //            given partition on reboot.
     //
     //            (API v2: <filename> may start with "PACKAGE:" to
     //            indicate taking a file from the OTA package.)
     //
     //            (API v3: this command no longer exists.)
     //
     //        ui_print <string>
     //            display <string> on the screen.
     //
     //        wipe_cache
     //            a wipe of cache will be performed following a successful
     //            installation.
     //
     //        clear_display
     //            turn off the text display.
     //
     //        enable_reboot
     //            packages can explicitly request that they want the user
     //            to be able to reboot during installation (useful for
     //            debugging packages that don't exit).
     //
     //   - the name of the package zip file.
     //
     //   - an optional argument "retry" if this update is a retry of a failed
     //   update attempt.
     //

     const char* args[6];
     args[0] = binary;
     args[1] = EXPAND(RECOVERY_API_VERSION);   // defined in Android.mk
     char temp[16];
     snprintf(temp, sizeof(temp), "%d", pipefd[1]);
     args[2] = temp;
     args[3] = path;
     args[4] = retry_count > 0 ? "retry" : NULL;
     args[5] = NULL;

     pid_t pid = fork();
     if (pid == 0) {
         umask(022);
         close(pipefd[0]);
         execv(binary, const_cast<char**>(args));
         fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno));
         _exit(-1);
     }
     close(pipefd[1]);

     *wipe_cache = false;
     bool retry_update = false;

     char buffer[1024];
     FILE* from_child = fdopen(pipefd[0], "r");
     while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
         char* command = strtok(buffer, " \n");
         if (command == NULL) {
             continue;
         } else if (strcmp(command, "progress") == 0) {
             char* fraction_s = strtok(NULL, " \n");
             char* seconds_s = strtok(NULL, " \n");

             float fraction = strtof(fraction_s, NULL);
             int seconds = strtol(seconds_s, NULL, 10);

             ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds);
         } else if (strcmp(command, "set_progress") == 0) {
             char* fraction_s = strtok(NULL, " \n");
             float fraction = strtof(fraction_s, NULL);
             ui->SetProgress(fraction);
         } else if (strcmp(command, "ui_print") == 0) {
             char* str = strtok(NULL, "\n");
             if (str) {
                 ui->PrintOnScreenOnly("%s", str);
             } else {
                 ui->PrintOnScreenOnly("\n");
             }
             fflush(stdout);
         } else if (strcmp(command, "wipe_cache") == 0) {
             *wipe_cache = true;
         } else if (strcmp(command, "clear_display") == 0) {
             ui->SetBackground(RecoveryUI::NONE);
         } else if (strcmp(command, "enable_reboot") == 0) {
             // packages can explicitly request that they want the user
             // to be able to reboot during installation (useful for
             // debugging packages that don't exit).
             ui->SetEnableReboot(true);
         } else if (strcmp(command, "retry_update") == 0) {
             retry_update = true;
         } else if (strcmp(command, "log") == 0) {
             // Save the logging request from updater and write to
             // last_install later.
             log_buffer.push_back(std::string(strtok(NULL, "\n")));
         } else {
             LOG(ERROR) << "unknown command [" << command << "]";
         }
     }
     fclose(from_child);

     int status;
     waitpid(pid, &status, 0);
     if (retry_update) {
         return INSTALL_RETRY;
     }
     if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
         LOG(ERROR) << "Error in " << path << " (Status " << WEXITSTATUS(status) << ")";
         return INSTALL_ERROR;
     }

     return INSTALL_SUCCESS;
 }

 static int
 really_install_package(const char *path, bool* wipe_cache, bool needs_mount,
                        std::vector<std::string>& log_buffer, int retry_count)
 {
     ui->SetBackground(RecoveryUI::INSTALLING_UPDATE);
     ui->Print("Finding update package...\n");
     // Give verification half the progress bar...
     ui->SetProgressType(RecoveryUI::DETERMINATE);
     ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME);
     LOG(INFO) << "Update location: " << path;

     // Map the update package into memory.
     ui->Print("Opening update package...\n");

     if (path && needs_mount) {
         if (path[0] == '@') {
             ensure_path_mounted(path+1);
         } else {
             ensure_path_mounted(path);
         }
     }

     MemMapping map;
     if (sysMapFile(path, &map) != 0) {
         LOG(ERROR) << "failed to map file";
         return INSTALL_CORRUPT;
     }

     // Verify package.
     if (!verify_package(map.addr, map.length)) {
         log_buffer.push_back(android::base::StringPrintf("error: %d", kZipVerificationFailure));
         sysReleaseMap(&map);
         return INSTALL_CORRUPT;
     }

     // Try to open the package.
     ZipArchiveHandle zip;
     int err = OpenArchiveFromMemory(map.addr, map.length, path, &zip);
     if (err != 0) {
         LOG(ERROR) << "Can't open " << path << " : " << ErrorCodeString(err);
         log_buffer.push_back(android::base::StringPrintf("error: %d", kZipOpenFailure));

         sysReleaseMap(&map);
         CloseArchive(zip);
         return INSTALL_CORRUPT;
     }

     // Verify and install the contents of the package.
     ui->Print("Installing update...\n");
     if (retry_count > 0) {
         ui->Print("Retry attempt: %d\n", retry_count);
     }
     ui->SetEnableReboot(false);
     int result = try_update_binary(path, zip, wipe_cache, log_buffer, retry_count);
     ui->SetEnableReboot(true);
     ui->Print("\n");

     sysReleaseMap(&map);
     CloseArchive(zip);
     return result;
 }

 int
 install_package(const char* path, bool* wipe_cache, const char* install_file,
                 bool needs_mount, int retry_count)
 {
     modified_flash = true;
     auto start = std::chrono::system_clock::now();

     int result;
     std::vector<std::string> log_buffer;
     if (setup_install_mounts() != 0) {
         LOG(ERROR) << "failed to set up expected mounts for install; aborting";
         result = INSTALL_ERROR;
     } else {
         result = really_install_package(path, wipe_cache, needs_mount, log_buffer, retry_count);
     }

     // Measure the time spent to apply OTA update in seconds.
     std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
     int time_total = static_cast<int>(duration.count());

     if (ensure_path_mounted(UNCRYPT_STATUS) != 0) {
         LOG(WARNING) << "Can't mount " << UNCRYPT_STATUS;
     } else {
         std::string uncrypt_status;
         if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) {
             PLOG(WARNING) << "failed to read uncrypt status";
         } else if (!android::base::StartsWith(uncrypt_status, "uncrypt_")) {
             LOG(WARNING) << "corrupted uncrypt_status: " << uncrypt_status;
         } else {
             log_buffer.push_back(android::base::Trim(uncrypt_status));
         }
     }

     // The first two lines need to be the package name and install result.
     std::vector<std::string> log_header = {
         path,
         result == INSTALL_SUCCESS ? "1" : "0",
         "time_total: " + std::to_string(time_total),
         "retry: " + std::to_string(retry_count),
     };
     std::string log_content = android::base::Join(log_header, "\n") + "\n" +
             android::base::Join(log_buffer, "\n");
     if (!android::base::WriteStringToFile(log_content, install_file)) {
         PLOG(ERROR) << "failed to write " << install_file;
     }

     // Write a copy into last_log.
     LOG(INFO) << log_content;

     return result;
 }

 bool verify_package(const unsigned char* package_data, size_t package_size) {
     std::vector<Certificate> loadedKeys;
     if (!load_keys(PUBLIC_KEYS_FILE, loadedKeys)) {
         LOG(ERROR) << "Failed to load keys";
         return false;
     }
     LOG(INFO) << loadedKeys.size() << " key(s) loaded from " << PUBLIC_KEYS_FILE;

     // Verify package.
     ui->Print("Verifying update package...\n");
     auto t0 = std::chrono::system_clock::now();
     int err = verify_file(const_cast<unsigned char*>(package_data), package_size, loadedKeys);
     std::chrono::duration<double> duration = std::chrono::system_clock::now() - t0;
     ui->Print("Update package verification took %.1f s (result %d).\n", duration.count(), err);
     if (err != VERIFY_SUCCESS) {
         LOG(ERROR) << "Signature verification failed";
         LOG(ERROR) << "error: " << kZipVerificationFailure;
         return false;
     }
     return true;
 }
	/*
	* Copyright (C) 2007 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <ctype.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <limits.h>
	#include <string.h>
	#include <sys/stat.h>
	#include <sys/wait.h>
	#include <unistd.h>

	#include <chrono>
	#include <string>
	#include <vector>

	#include <android-base/file.h>
	#include <android-base/logging.h>
	#include <android-base/parseint.h>
	#include <android-base/stringprintf.h>
	#include <android-base/strings.h>
	#include <ziparchive/zip_archive.h>

	#include "common.h"
	#include "error_code.h"
	#include "install.h"
	#include "minui/minui.h"
	#include "otautil/SysUtil.h"
	#include "roots.h"
	#include "ui.h"
	#include "verifier.h"

	#define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary"
	#define PUBLIC_KEYS_FILE "/res/keys"
	static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata";
	static constexpr const char* UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";

	// Default allocation of progress bar segments to operations
	static const int VERIFICATION_PROGRESS_TIME = 60;
	static const float VERIFICATION_PROGRESS_FRACTION = 0.25;
	static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4;
	static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1;

	// This function parses and returns the build.version.incremental
	static int parse_build_number(const std::string& str) {
	size_t pos = str.find('=');
	if (pos != std::string::npos) {
	std::string num_string = android::base::Trim(str.substr(pos+1));
	int build_number;
	if (android::base::ParseInt(num_string.c_str(), &build_number, 0)) {
	return build_number;
	}
	}

	LOG(ERROR) << "Failed to parse build number in " << str;
	return -1;
	}

	bool read_metadata_from_package(ZipArchiveHandle zip, std::string* meta_data) {
	ZipString metadata_path(METADATA_PATH);
	ZipEntry meta_entry;
	if (meta_data == nullptr) {
	LOG(ERROR) << "string* meta_data can't be nullptr";
	return false;
	}
	if (FindEntry(zip, metadata_path, &meta_entry) != 0) {
	LOG(ERROR) << "Failed to find " << METADATA_PATH << " in update package";
	return false;
	}

	meta_data->resize(meta_entry.uncompressed_length, '\0');
	if (ExtractToMemory(zip, &meta_entry, reinterpret_cast<uint8_t>(&(meta_data)[0]),
	meta_entry.uncompressed_length) != 0) {
	LOG(ERROR) << "Failed to read metadata in update package";
	return false;
	}
	return true;
	}

	// Read the build.version.incremental of src/tgt from the metadata and log it to last_install.
	static void read_source_target_build(ZipArchiveHandle zip, std::vector<std::string>& log_buffer) {
	std::string meta_data;
	if (!read_metadata_from_package(zip, &meta_data)) {
	return;
	}
	// Examples of the pre-build and post-build strings in metadata:
	// pre-build-incremental=2943039
	// post-build-incremental=2951741
	std::vector<std::string> lines = android::base::Split(meta_data, "\n");
	for (const std::string& line : lines) {
	std::string str = android::base::Trim(line);
	if (android::base::StartsWith(str, "pre-build-incremental")){
	int source_build = parse_build_number(str);
	if (source_build != -1) {
	log_buffer.push_back(android::base::StringPrintf("source_build: %d",
	source_build));
	}
	} else if (android::base::StartsWith(str, "post-build-incremental")) {
	int target_build = parse_build_number(str);
	if (target_build != -1) {
	log_buffer.push_back(android::base::StringPrintf("target_build: %d",
	target_build));
	}
	}
	}
	}

	// If the package contains an update binary, extract it and run it.
	static int
	try_update_binary(const char* path, ZipArchiveHandle zip, bool* wipe_cache,
	std::vector<std::string>& log_buffer, int retry_count)
	{
	read_source_target_build(zip, log_buffer);

	ZipString binary_name(ASSUMED_UPDATE_BINARY_NAME);
	ZipEntry binary_entry;
	if (FindEntry(zip, binary_name, &binary_entry) != 0) {
	return INSTALL_CORRUPT;
	}

	const char* binary = "/tmp/update_binary";
	unlink(binary);
	int fd = creat(binary, 0755);
	if (fd < 0) {
	PLOG(ERROR) << "Can't make " << binary;
	return INSTALL_ERROR;
	}
	int error = ExtractEntryToFile(zip, &binary_entry, fd);
	close(fd);

	if (error != 0) {
	LOG(ERROR) << "Can't copy " << ASSUMED_UPDATE_BINARY_NAME
	<< " : " << ErrorCodeString(error);
	return INSTALL_ERROR;
	}

	int pipefd[2];
	pipe(pipefd);

	// When executing the update binary contained in the package, the
	// arguments passed are:
	//
	// - the version number for this interface
	//
	// - an fd to which the program can write in order to update the
	// progress bar. The program can write single-line commands:
	//
	// progress <frac> <secs>
	// fill up the next <frac> part of of the progress bar
	// over <secs> seconds. If <secs> is zero, use
	// set_progress commands to manually control the
	// progress of this segment of the bar.
	//
	// set_progress <frac>
	// <frac> should be between 0.0 and 1.0; sets the
	// progress bar within the segment defined by the most
	// recent progress command.
	//
	// firmware <"hboot"\|"radio"> <filename>
	// arrange to install the contents of <filename> in the
	// given partition on reboot.
	//
	// (API v2: <filename> may start with "PACKAGE:" to
	// indicate taking a file from the OTA package.)
	//
	// (API v3: this command no longer exists.)
	//
	// ui_print <string>
	// display <string> on the screen.
	//
	// wipe_cache
	// a wipe of cache will be performed following a successful
	// installation.
	//
	// clear_display
	// turn off the text display.
	//
	// enable_reboot
	// packages can explicitly request that they want the user
	// to be able to reboot during installation (useful for
	// debugging packages that don't exit).
	//
	// - the name of the package zip file.
	//
	// - an optional argument "retry" if this update is a retry of a failed
	// update attempt.
	//

	const char* args[6];
	args[0] = binary;
	args[1] = EXPAND(RECOVERY_API_VERSION); // defined in Android.mk
	char temp[16];
	snprintf(temp, sizeof(temp), "%d", pipefd[1]);
	args[2] = temp;
	args[3] = path;
	args[4] = retry_count > 0 ? "retry" : NULL;
	args[5] = NULL;

	pid_t pid = fork();
	if (pid == 0) {
	umask(022);
	close(pipefd[0]);
	execv(binary, const_cast<char**>(args));
	fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno));
	_exit(-1);
	}
	close(pipefd[1]);

	*wipe_cache = false;
	bool retry_update = false;

	char buffer[1024];
	FILE* from_child = fdopen(pipefd[0], "r");
	while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
	char* command = strtok(buffer, " \n");
	if (command == NULL) {
	continue;
	} else if (strcmp(command, "progress") == 0) {
	char* fraction_s = strtok(NULL, " \n");
	char* seconds_s = strtok(NULL, " \n");

	float fraction = strtof(fraction_s, NULL);
	int seconds = strtol(seconds_s, NULL, 10);

	ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds);
	} else if (strcmp(command, "set_progress") == 0) {
	char* fraction_s = strtok(NULL, " \n");
	float fraction = strtof(fraction_s, NULL);
	ui->SetProgress(fraction);
	} else if (strcmp(command, "ui_print") == 0) {
	char* str = strtok(NULL, "\n");
	if (str) {
	ui->PrintOnScreenOnly("%s", str);
	} else {
	ui->PrintOnScreenOnly("\n");
	}
	fflush(stdout);
	} else if (strcmp(command, "wipe_cache") == 0) {
	*wipe_cache = true;
	} else if (strcmp(command, "clear_display") == 0) {
	ui->SetBackground(RecoveryUI::NONE);
	} else if (strcmp(command, "enable_reboot") == 0) {
	// packages can explicitly request that they want the user
	// to be able to reboot during installation (useful for
	// debugging packages that don't exit).
	ui->SetEnableReboot(true);
	} else if (strcmp(command, "retry_update") == 0) {
	retry_update = true;
	} else if (strcmp(command, "log") == 0) {
	// Save the logging request from updater and write to
	// last_install later.
	log_buffer.push_back(std::string(strtok(NULL, "\n")));
	} else {
	LOG(ERROR) << "unknown command [" << command << "]";
	}
	}
	fclose(from_child);

	int status;
	waitpid(pid, &status, 0);
	if (retry_update) {
	return INSTALL_RETRY;
	}
	if (!WIFEXITED(status) \|\| WEXITSTATUS(status) != 0) {
	LOG(ERROR) << "Error in " << path << " (Status " << WEXITSTATUS(status) << ")";
	return INSTALL_ERROR;
	}

	return INSTALL_SUCCESS;
	}

	static int
	really_install_package(const char path, bool wipe_cache, bool needs_mount,
	std::vector<std::string>& log_buffer, int retry_count)
	{
	ui->SetBackground(RecoveryUI::INSTALLING_UPDATE);
	ui->Print("Finding update package...\n");
	// Give verification half the progress bar...
	ui->SetProgressType(RecoveryUI::DETERMINATE);
	ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME);
	LOG(INFO) << "Update location: " << path;

	// Map the update package into memory.
	ui->Print("Opening update package...\n");

	if (path && needs_mount) {
	if (path[0] == '@') {
	ensure_path_mounted(path+1);
	} else {
	ensure_path_mounted(path);
	}
	}

	MemMapping map;
	if (sysMapFile(path, &map) != 0) {
	LOG(ERROR) << "failed to map file";
	return INSTALL_CORRUPT;
	}

	// Verify package.
	if (!verify_package(map.addr, map.length)) {
	log_buffer.push_back(android::base::StringPrintf("error: %d", kZipVerificationFailure));
	sysReleaseMap(&map);
	return INSTALL_CORRUPT;
	}

	// Try to open the package.
	ZipArchiveHandle zip;
	int err = OpenArchiveFromMemory(map.addr, map.length, path, &zip);
	if (err != 0) {
	LOG(ERROR) << "Can't open " << path << " : " << ErrorCodeString(err);
	log_buffer.push_back(android::base::StringPrintf("error: %d", kZipOpenFailure));

	sysReleaseMap(&map);
	CloseArchive(zip);
	return INSTALL_CORRUPT;
	}

	// Verify and install the contents of the package.
	ui->Print("Installing update...\n");
	if (retry_count > 0) {
	ui->Print("Retry attempt: %d\n", retry_count);
	}
	ui->SetEnableReboot(false);
	int result = try_update_binary(path, zip, wipe_cache, log_buffer, retry_count);
	ui->SetEnableReboot(true);
	ui->Print("\n");

	sysReleaseMap(&map);
	CloseArchive(zip);
	return result;
	}

	int
	install_package(const char* path, bool* wipe_cache, const char* install_file,
	bool needs_mount, int retry_count)
	{
	modified_flash = true;
	auto start = std::chrono::system_clock::now();

	int result;
	std::vector<std::string> log_buffer;
	if (setup_install_mounts() != 0) {
	LOG(ERROR) << "failed to set up expected mounts for install; aborting";
	result = INSTALL_ERROR;
	} else {
	result = really_install_package(path, wipe_cache, needs_mount, log_buffer, retry_count);
	}

	// Measure the time spent to apply OTA update in seconds.
	std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
	int time_total = static_cast<int>(duration.count());

	if (ensure_path_mounted(UNCRYPT_STATUS) != 0) {
	LOG(WARNING) << "Can't mount " << UNCRYPT_STATUS;
	} else {
	std::string uncrypt_status;
	if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) {
	PLOG(WARNING) << "failed to read uncrypt status";
	} else if (!android::base::StartsWith(uncrypt_status, "uncrypt_")) {
	LOG(WARNING) << "corrupted uncrypt_status: " << uncrypt_status;
	} else {
	log_buffer.push_back(android::base::Trim(uncrypt_status));
	}
	}

	// The first two lines need to be the package name and install result.
	std::vector<std::string> log_header = {
	path,
	result == INSTALL_SUCCESS ? "1" : "0",
	"time_total: " + std::to_string(time_total),
	"retry: " + std::to_string(retry_count),
	};
	std::string log_content = android::base::Join(log_header, "\n") + "\n" +
	android::base::Join(log_buffer, "\n");
	if (!android::base::WriteStringToFile(log_content, install_file)) {
	PLOG(ERROR) << "failed to write " << install_file;
	}

	// Write a copy into last_log.
	LOG(INFO) << log_content;

	return result;
	}

	bool verify_package(const unsigned char* package_data, size_t package_size) {
	std::vector<Certificate> loadedKeys;
	if (!load_keys(PUBLIC_KEYS_FILE, loadedKeys)) {
	LOG(ERROR) << "Failed to load keys";
	return false;
	}
	LOG(INFO) << loadedKeys.size() << " key(s) loaded from " << PUBLIC_KEYS_FILE;

	// Verify package.
	ui->Print("Verifying update package...\n");
	auto t0 = std::chrono::system_clock::now();
	int err = verify_file(const_cast<unsigned char*>(package_data), package_size, loadedKeys);
	std::chrono::duration<double> duration = std::chrono::system_clock::now() - t0;
	ui->Print("Update package verification took %.1f s (result %d).\n", duration.count(), err);
	if (err != VERIFY_SUCCESS) {
	LOG(ERROR) << "Signature verification failed";
	LOG(ERROR) << "error: " << kZipVerificationFailure;
	return false;
	}
	return true;
	}