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/*
* Copyright (C) 2016 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 <iostream>
#include <android-base/logging.h>
#include <android-base/strings.h>
#ifndef LOG_TAG
#define LOG_TAG "preopt2cachename"
#endif
static const char* kDalvikCacheDir = "/data/dalvik-cache/";
static const char* kOdexCacheSuffix = "@classes.dex";
static const char* kVdexCacheSuffix = "@classes.vdex";
static const char* kArtCacheSuffix = "@classes.art";
// Returns the ISA extracted from the file_location. file_location is formatted like
// /system{/product,}/{priv-,}app/<app_name>/oat/<isa>/<app_name>.{odex,vdex} for all functions. We
// return an empty string "" in error cases.
static std::string ExtractISA(const std::string& file_location) {
std::vector<std::string> split_file_location = android::base::Split(file_location, "/");
if (split_file_location.size() <= 1) {
return "";
} else if (split_file_location.size() != 7 && split_file_location.size() != 8) {
LOG(WARNING) << "Unexpected length for file-location. We expected 7 or 8 segments but found "
<< split_file_location.size() << " for " << file_location;
}
return split_file_location[split_file_location.size() - 2];
}
// Returns the apk name extracted from the file_location.
// file_location is formatted like /system/app/<app_name>/oat/<isa>/<app_name>.{odex,vdex}.
// We return the final <app_name> with the .{odex,vdex} replaced with .apk.
static std::string ExtractAPKName(const std::string& file_location) {
// Find and copy filename.
size_t file_location_start = file_location.rfind('/');
if (file_location_start == std::string::npos) {
return "";
}
size_t ext_start = file_location.rfind('.');
if (ext_start == std::string::npos || ext_start < file_location_start) {
return "";
}
std::string apk_name = file_location.substr(file_location_start + 1,
ext_start - file_location_start);
// Replace extension with .apk.
apk_name += "apk";
return apk_name;
}
// The cache file name is /data/dalvik-cache/<isa>/ prior to this function
static bool SystemBFilenameToCacheFile(const std::string& file_location,
/*in-out*/std::string& cache_file) {
// Skip the first '/' in file_location.
size_t initial_position = file_location[0] == '/' ? 1 : 0;
size_t apk_position = file_location.find("/oat", initial_position);
if (apk_position == std::string::npos) {
LOG(ERROR) << "Unable to find oat directory!";
return false;
}
size_t cache_file_position = cache_file.size();
cache_file += file_location.substr(initial_position, apk_position);
// '/' -> '@' up to where the apk would be.
cache_file_position = cache_file.find('/', cache_file_position);
while (cache_file_position != std::string::npos) {
cache_file[cache_file_position] = '@';
cache_file_position = cache_file.find('/', cache_file_position);
}
// Add <apk_name>.
std::string apk_name = ExtractAPKName(file_location);
if (apk_name.empty()) {
LOG(ERROR) << "Unable to determine apk name from file name '" << file_location << "'";
return false;
}
std::string::size_type pos = file_location.find_last_of('.');
if (pos == std::string::npos) {
LOG(ERROR) << "Invalid file location '" << file_location << "'";
return false;
}
cache_file += apk_name;
std::string extension(file_location.substr(pos));
if (extension == ".vdex") {
cache_file += kVdexCacheSuffix;
} else if (extension == ".art") {
cache_file += kArtCacheSuffix;
} else {
cache_file += kOdexCacheSuffix;
}
return true;
}
// Do the overall transformation from file_location to output_file_location. Prior to this the
// output_file_location is empty.
static bool SystemBFileToCacheFile(const std::string& file_location,
/*out*/std::string& output_file_location) {
std::string isa = ExtractISA(file_location);
if (isa.empty()) {
LOG(ERROR) << "Unable to determine isa for file '" << file_location << "', skipping";
return false;
}
output_file_location += isa;
output_file_location += '/';
return SystemBFilenameToCacheFile(file_location, output_file_location);
}
// This program is used to determine where in the /data directory the runtime will search for an
// odex file if it is unable to find one at the given 'preopt-name' location. This is used to allow
// us to store these preopted files in the unused system_b partition and copy them out on first
// boot of the device.
int main(int argc, char *argv[]) {
if (argc != 2) {
LOG(ERROR) << "usage: preopt2cachename preopt-location";
return 2;
}
std::string file_location(argv[1]);
std::string output_file_location(kDalvikCacheDir);
if (!SystemBFileToCacheFile(file_location, output_file_location)) {
return 1;
} else {
std::cout << output_file_location;
}
return 0;
}
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