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author | Alex Light <allight@google.com> | 2016-06-21 16:17:48 -0700 |
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committer | Alex Light <allight@google.com> | 2016-06-29 10:01:35 -0700 |
commit | 9b71cad2381cbd67d7e3a9ca2af357ae6998be83 (patch) | |
tree | 3eef87206da6fcb032b54136a7997cb7187ffe70 /preopt2cachename | |
parent | 0c2c44bfac3cef379470c78038eab73ce8fa6b58 (diff) | |
download | extras-9b71cad2381cbd67d7e3a9ca2af357ae6998be83.tar.gz |
Copy preopted files from B partition.
This translates from the preopted files in the system_other partition
into the main dalvik-cache. This also has init scripts to allow this
to run.
We first copy to a temporary file before renaming them in order to
make the copy atomic.
Bug: 29278988
Change-Id: I8bf1b2d021998949fd9996a923be7db9691e6a1e
Diffstat (limited to 'preopt2cachename')
-rw-r--r-- | preopt2cachename/Android.mk | 32 | ||||
-rw-r--r-- | preopt2cachename/preopt2cachename.cpp | 126 |
2 files changed, 158 insertions, 0 deletions
diff --git a/preopt2cachename/Android.mk b/preopt2cachename/Android.mk new file mode 100644 index 00000000..b5a51d99 --- /dev/null +++ b/preopt2cachename/Android.mk @@ -0,0 +1,32 @@ +# Copyright 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. + +LOCAL_PATH:= $(call my-dir) + +include $(CLEAR_VARS) + +LOCAL_MODULE:= preopt2cachename + +LOCAL_SRC_FILES := \ + preopt2cachename.cpp + +LOCAL_SHARED_LIBRARIES := \ + libsysutils \ + liblog \ + libcutils \ + libbase + +LOCAL_CFLAGS := -Werror -Wall + +include $(BUILD_EXECUTABLE) diff --git a/preopt2cachename/preopt2cachename.cpp b/preopt2cachename/preopt2cachename.cpp new file mode 100644 index 00000000..dfdc63f3 --- /dev/null +++ b/preopt2cachename/preopt2cachename.cpp @@ -0,0 +1,126 @@ +/* + * 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* kCacheSuffix = "@classes.dex"; + +// Returns the ISA extracted from the odex_file_location. +// odex_file_location is formatted like /system/app/<app_name>/oat/<isa>/<app_name>.odex for all +// functions. We return an empty string "" in error cases. +static std::string ExtractISA(const std::string& odex_file_location) { + std::vector<std::string> split_file_location = android::base::Split(odex_file_location, "/"); + if (split_file_location.size() <= 1) { + return ""; + } else if (split_file_location.size() != 7) { + LOG(WARNING) << "Unexpected length for odex-file-location. We expected 7 segments but found " + << split_file_location.size(); + } + return split_file_location[split_file_location.size() - 2]; +} + +// Returns the apk name extracted from the odex_file_location. +// odex_file_location is formatted like /system/app/<app_name>/oat/<isa>/<app_name>.odex. We return +// the final <app_name> with the .odex replaced with .apk. +static std::string ExtractAPKName(const std::string& odex_file_location) { + // Find and copy filename. + size_t file_location_start = odex_file_location.rfind('/'); + if (file_location_start == std::string::npos) { + return ""; + } + size_t ext_start = odex_file_location.rfind('.'); + if (ext_start == std::string::npos || ext_start < file_location_start) { + return ""; + } + std::string apk_name = odex_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 OdexFilenameToCacheFile(const std::string& odex_file_location, + /*in-out*/std::string& cache_file) { + // Skip the first '/' in odex_file_location. + size_t initial_position = odex_file_location[0] == '/' ? 1 : 0; + size_t apk_position = odex_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 += odex_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(odex_file_location); + if (apk_name.empty()) { + LOG(ERROR) << "Unable to determine apk name from odex file name '" << odex_file_location << "'"; + return false; + } + cache_file += apk_name; + cache_file += kCacheSuffix; + return true; +} + +// Do the overall transformation from odex_file_location to output_file_location. Prior to this the +// output_file_location is empty. +static bool OdexToCacheFile(std::string& odex_file_location, + /*out*/std::string& output_file_location) { + std::string isa = ExtractISA(odex_file_location); + if (isa.empty()) { + LOG(ERROR) << "Unable to determine isa for odex file '" << odex_file_location << "', skipping"; + return false; + } + output_file_location += isa; + output_file_location += '/'; + return OdexFilenameToCacheFile(odex_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 odex_file_location(argv[1]); + std::string output_file_location(kDalvikCacheDir); + if (!OdexToCacheFile(odex_file_location, output_file_location)) { + return 1; + } else { + std::cout << output_file_location; + } + return 0; +} |