| /* |
| * Copyright (C) 2015 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 <ftw.h> |
| #include <libgen.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <iostream> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "android-base/logging.h" |
| |
| // The name of the directory that holds a staged time zone update distro. If this exists it should |
| // replace the one in CURRENT_DIR_NAME. |
| // See also libcore.tzdata.update2.TimeZoneDistroInstaller. |
| static const char* STAGED_DIR_NAME = "/staged"; |
| |
| // The name of the directory that holds the (optional) installed time zone update distro. |
| // See also libcore.tzdata.update2.TimeZoneDistroInstaller. |
| static const char* CURRENT_DIR_NAME = "/current"; |
| |
| // The name of a file in the staged dir that indicates the staged operation is an "uninstall". |
| // See also libcore.tzdata.update2.TimeZoneDistroInstaller. |
| static const char* UNINSTALL_TOMBSTONE_FILE_NAME = "/STAGED_UNINSTALL_TOMBSTONE"; |
| |
| // The name of the file containing the distro version information. |
| // See also libcore.tzdata.shared2.TimeZoneDistro / libcore.tzdata.shared2.DistroVersion. |
| static const char* DISTRO_VERSION_FILENAME = "/distro_version"; |
| |
| // distro_version is an ASCII file consisting of 17 bytes in the form: AAA.BBB|CCCCC|DDD |
| // AAA.BBB is the major/minor version of the distro format (e.g. 001.001), |
| // CCCCC is the rules version (e.g. 2016g) |
| // DDD is the android revision for this rules version to allow for distro corrections (e.g. 001) |
| // We only need the first 13 to determine if it is suitable for the device. |
| static const int DISTRO_VERSION_LENGTH = 13; |
| |
| // The major version of the distro format supported by this code as a null-terminated char[]. |
| // See also libcore.tzdata.shared2.TimeZoneDistro / libcore.tzdata.shared2.DistroVersion. |
| static const char SUPPORTED_DISTRO_MAJOR_VERSION[] = "001"; |
| |
| // The length of the distro format major version excluding the \0 |
| static const size_t SUPPORTED_DISTRO_MAJOR_VERSION_LEN = sizeof(SUPPORTED_DISTRO_MAJOR_VERSION) - 1; |
| |
| // The minor version of the distro format supported by this code as a null-terminated char[]. |
| // See also libcore.tzdata.shared2.TimeZoneDistro / libcore.tzdata.shared2.DistroVersion. |
| static const char SUPPORTED_DISTRO_MINOR_VERSION[] = "001"; |
| |
| // The length of the distro format minor version excluding the \0 |
| static const size_t SUPPORTED_DISTRO_MINOR_VERSION_LEN = sizeof(SUPPORTED_DISTRO_MINOR_VERSION) - 1; |
| |
| // The length of the distro format version. e.g. 001.001 |
| static const size_t SUPPORTED_DISTRO_VERSION_LEN = |
| SUPPORTED_DISTRO_MAJOR_VERSION_LEN + SUPPORTED_DISTRO_MINOR_VERSION_LEN + 1; |
| |
| // The length of the IANA rules version bytes. e.g. 2016a |
| static const size_t RULES_VERSION_LEN = 5; |
| |
| // Distro version bytes are: AAA.BBB|CCCCC - the rules version is CCCCC |
| static const size_t DISTRO_VERSION_RULES_IDX = 8; |
| |
| // See also libcore.tzdata.shared2.TimeZoneDistro. |
| static const char* TZDATA_FILENAME = "/tzdata"; |
| |
| // tzdata file header (as much as we need for the version): |
| // byte[11] tzdata_version -- e.g. "tzdata2012f" |
| static const int TZ_HEADER_LENGTH = 11; |
| |
| static const char TZ_DATA_HEADER_PREFIX[] = "tzdata"; |
| static const size_t TZ_DATA_HEADER_PREFIX_LEN = sizeof(TZ_DATA_HEADER_PREFIX) - 1; // exclude \0 |
| |
| static void usage() { |
| std::cerr << "Usage: tzdatacheck SYSTEM_TZ_DIR DATA_TZ_DIR\n" |
| "\n" |
| "Checks whether any timezone update distro in DATA_TZ_DIR is compatible with the\n" |
| "current Android release and better than or the same as base system timezone rules in\n" |
| "SYSTEM_TZ_DIR. If the timezone rules in SYSTEM_TZ_DIR are a higher version than the\n" |
| "one in DATA_TZ_DIR the DATA_TZ_DIR is renamed and then deleted.\n"; |
| exit(1); |
| } |
| |
| /* |
| * Opens a file and fills buffer with the first byteCount bytes from the file. |
| * If the file does not exist or cannot be opened or is too short then false is returned. |
| * If the bytes were read successfully then true is returned. |
| */ |
| static bool readBytes(const std::string& fileName, char* buffer, size_t byteCount) { |
| FILE* file = fopen(fileName.c_str(), "r"); |
| if (file == nullptr) { |
| if (errno != ENOENT) { |
| PLOG(WARNING) << "Error opening file " << fileName; |
| } |
| return false; |
| } |
| size_t bytesRead = fread(buffer, 1, byteCount, file); |
| fclose(file); |
| if (bytesRead != byteCount) { |
| LOG(WARNING) << fileName << " is too small. " << byteCount << " bytes required"; |
| return false; |
| } |
| return true; |
| } |
| |
| /* |
| * Checks the contents of headerBytes. Returns true if it is valid (starts with "tzdata"), false |
| * otherwise. |
| */ |
| static bool checkValidTzDataHeader(const std::string& fileName, const char* headerBytes) { |
| if (strncmp("tzdata", headerBytes, 6) != 0) { |
| LOG(WARNING) << fileName << " does not start with the expected bytes (tzdata)"; |
| return false; |
| } |
| return true; |
| } |
| |
| static bool checkDigits(const char* buffer, const size_t count, size_t* i) { |
| for (size_t j = 0; j < count; j++) { |
| char toCheck = buffer[(*i)++]; |
| if (!isdigit(toCheck)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| static bool checkValidDistroVersion(const char* buffer) { |
| // See DISTRO_VERSION_LENGTH comments above for a description of the format. |
| size_t i = 0; |
| if (!checkDigits(buffer, 3, &i)) { |
| return false; |
| } |
| if (buffer[i++] != '.') { |
| return false; |
| } |
| if (!checkDigits(buffer, 3, &i)) { |
| return false; |
| } |
| if (buffer[i++] != '|') { |
| return false; |
| } |
| if (!checkDigits(buffer, 4, &i)) { |
| return false; |
| } |
| // Ignore the last character. It is assumed to be a letter but we don't check because it's not |
| // obvious what would happen at 'z'. |
| return true; |
| } |
| |
| /* Return the parent directory of dirName. */ |
| static std::string getParentDir(const std::string& dirName) { |
| std::unique_ptr<char> mutable_dirname(strdup(dirName.c_str())); |
| return dirname(mutable_dirname.get()); |
| } |
| |
| /* Deletes a single file, symlink or directory. Called from nftw(). */ |
| static int deleteFn(const char* fpath, const struct stat*, int typeflag, struct FTW*) { |
| LOG(DEBUG) << "Inspecting " << fpath; |
| switch (typeflag) { |
| case FTW_F: |
| case FTW_SL: |
| LOG(DEBUG) << "Unlinking " << fpath; |
| if (unlink(fpath)) { |
| PLOG(WARNING) << "Failed to unlink file/symlink " << fpath; |
| } |
| break; |
| case FTW_D: |
| case FTW_DP: |
| LOG(DEBUG) << "Removing dir " << fpath; |
| if (rmdir(fpath)) { |
| PLOG(WARNING) << "Failed to remove dir " << fpath; |
| } |
| break; |
| default: |
| LOG(WARNING) << "Unsupported file type " << fpath << ": " << typeflag; |
| break; |
| } |
| return 0; |
| } |
| |
| enum PathStatus { ERR, NONE, IS_DIR, IS_REG, UNKNOWN }; |
| |
| static PathStatus checkPath(const std::string& path) { |
| struct stat buf; |
| if (stat(path.c_str(), &buf) != 0) { |
| if (errno != ENOENT) { |
| PLOG(WARNING) << "Unable to stat " << path; |
| return ERR; |
| } |
| return NONE; |
| } |
| return S_ISDIR(buf.st_mode) ? IS_DIR : S_ISREG(buf.st_mode) ? IS_REG : UNKNOWN; |
| } |
| |
| /* |
| * Deletes fileToDelete and returns true if it is successful. If fileToDelete is not a file or |
| * cannot be accessed this method returns false. |
| */ |
| static bool deleteFile(const std::string& fileToDelete) { |
| // Check whether the file exists. |
| PathStatus pathStatus = checkPath(fileToDelete); |
| if (pathStatus == NONE) { |
| LOG(INFO) << "Path " << fileToDelete << " does not exist"; |
| return true; |
| } |
| if (pathStatus != IS_REG) { |
| LOG(WARNING) << "Path " << fileToDelete << " failed to stat() or is not a file."; |
| return false; |
| } |
| |
| // Attempt the deletion. |
| int rc = unlink(fileToDelete.c_str()); |
| if (rc != 0) { |
| PLOG(WARNING) << "unlink() failed for " << fileToDelete; |
| } |
| return rc == 0; |
| } |
| |
| /* |
| * Deletes dirToDelete and returns true if it is successful in removing or moving the directory out |
| * of the way. If dirToDelete does not exist this function does nothing and returns true. If |
| * dirToDelete is not a directory or cannot be accessed this method returns false. |
| * |
| * During deletion, this function first renames the directory to a temporary name. If the temporary |
| * directory cannot be created, or the directory cannot be renamed, false is returned. After the |
| * rename, deletion of files and subdirs beneath the directory is performed on a "best effort" |
| * basis. Symlinks beneath the directory are not followed. |
| */ |
| static bool deleteDir(const std::string& dirToDelete) { |
| // Check whether the dir exists. |
| int pathStatus = checkPath(dirToDelete); |
| if (pathStatus == NONE) { |
| LOG(INFO) << "Path " << dirToDelete << " does not exist"; |
| return true; |
| } |
| if (pathStatus != IS_DIR) { |
| LOG(WARNING) << "Path " << dirToDelete << " failed to stat() or is not a directory."; |
| return false; |
| } |
| |
| // First, rename dirToDelete. |
| |
| std::string tempDirNameTemplate = getParentDir(dirToDelete); |
| tempDirNameTemplate += "/tempXXXXXX"; |
| |
| // Create an empty directory with the temporary name. For this we need a non-const char*. |
| std::vector<char> tempDirName(tempDirNameTemplate.length() + 1); |
| strcpy(&tempDirName[0], tempDirNameTemplate.c_str()); |
| if (mkdtemp(&tempDirName[0]) == nullptr) { |
| PLOG(WARNING) << "Unable to create a temporary directory: " << tempDirNameTemplate; |
| return false; |
| } |
| |
| // Rename dirToDelete to tempDirName (replacing the empty tempDirName directory created above). |
| int rc = rename(dirToDelete.c_str(), &tempDirName[0]); |
| if (rc == -1) { |
| PLOG(WARNING) << "Unable to rename directory from " << dirToDelete << " to " |
| << &tempDirName[0]; |
| return false; |
| } |
| |
| // Recursively delete contents of tempDirName. |
| |
| rc = nftw(&tempDirName[0], deleteFn, 10 /* openFiles */, |
| FTW_DEPTH | FTW_MOUNT | FTW_PHYS); |
| if (rc == -1) { |
| LOG(INFO) << "Could not delete directory: " << &tempDirName[0]; |
| } |
| return true; |
| } |
| |
| /* |
| * Deletes the ConfigInstaller metadata directory. |
| * TODO(nfuller). http://b/31008728 Remove this when ConfigInstaller is no longer used. |
| */ |
| static void deleteConfigUpdaterMetadataDir(const char* dataZoneInfoDir) { |
| // Delete the update metadata |
| std::string dataUpdatesDirName(dataZoneInfoDir); |
| dataUpdatesDirName += "/updates"; |
| LOG(INFO) << "Removing: " << dataUpdatesDirName; |
| if (!deleteDir(dataUpdatesDirName)) { |
| LOG(WARNING) << "Deletion of install metadata " << dataUpdatesDirName |
| << " was not successful"; |
| } |
| } |
| |
| /* |
| * Deletes the timezone update distro directory. |
| */ |
| static void deleteUpdateDistroDir(const std::string& distroDirName) { |
| LOG(INFO) << "Removing: " << distroDirName; |
| if (!deleteDir(distroDirName)) { |
| LOG(WARNING) << "Deletion of distro dir " << distroDirName << " was not successful"; |
| } |
| } |
| |
| static void handleStagedUninstall(const std::string& dataStagedDirName, |
| const std::string& dataCurrentDirName, |
| const PathStatus dataCurrentDirStatus) { |
| LOG(INFO) << "Staged operation is an uninstall."; |
| |
| // Delete the current install directory. |
| switch (dataCurrentDirStatus) { |
| case NONE: |
| // This is unexpected: No uninstall should be staged if there is nothing to |
| // uninstall. Carry on anyway. |
| LOG(WARNING) << "No current install to delete."; |
| break; |
| case IS_DIR: |
| // This is normal. Delete the current install dir. |
| if (!deleteDir(dataCurrentDirName)) { |
| LOG(WARNING) << "Deletion of current distro " << dataCurrentDirName |
| << " was not successful"; |
| // If this happens we don't know whether we were able to delete or not. We don't |
| // delete the staged operation so it will be retried next boot unless overridden. |
| return; |
| } |
| break; |
| case IS_REG: |
| default: |
| // This is unexpected: We can try to delete the unexpected file and carry on. |
| LOG(WARNING) << "Current distro dir " << dataCurrentDirName |
| << " is not actually a directory. Attempting deletion."; |
| if (!deleteFile(dataCurrentDirName)) { |
| LOG(WARNING) << "Could not delete " << dataCurrentDirName; |
| return; |
| } |
| break; |
| } |
| |
| // Delete the staged uninstall dir. |
| if (!deleteDir(dataStagedDirName)) { |
| LOG(WARNING) << "Deletion of current distro " << dataCurrentDirName |
| << " was not successful"; |
| // If this happens we don't know whether we were able to delete the staged operation |
| // or not. |
| return; |
| } |
| LOG(INFO) << "Staged uninstall complete."; |
| } |
| |
| static void handleStagedInstall(const std::string& dataStagedDirName, |
| const std::string& dataCurrentDirName, |
| const PathStatus dataCurrentDirStatus) { |
| LOG(INFO) << "Staged operation is an install."; |
| |
| switch (dataCurrentDirStatus) { |
| case NONE: |
| // This is expected: This is the first install. |
| LOG(INFO) << "No current install to replace."; |
| break; |
| case IS_DIR: |
| // This is expected: We are replacing an existing install. |
| // Delete the current dir so we can replace it. |
| if (!deleteDir(dataCurrentDirName)) { |
| LOG(WARNING) << "Deletion of current distro " << dataCurrentDirName |
| << " was not successful"; |
| // If this happens, we cannot proceed. |
| return; |
| } |
| break; |
| case IS_REG: |
| default: |
| // This is unexpected: We can try to delete the unexpected file and carry on. |
| LOG(WARNING) << "Current distro dir " << dataCurrentDirName |
| << " is not actually a directory. Attempting deletion."; |
| if (!deleteFile(dataCurrentDirName)) { |
| LOG(WARNING) << "Could not delete " << dataCurrentDirName; |
| return; |
| } |
| break; |
| } |
| |
| // Move the staged dir so it is the new current dir, completing the install. |
| LOG(INFO) << "Moving " << dataStagedDirName << " to " << dataCurrentDirName; |
| int rc = rename(dataStagedDirName.c_str(), dataCurrentDirName.c_str()); |
| if (rc == -1) { |
| PLOG(WARNING) << "Unable to rename directory from " << dataStagedDirName << " to " |
| << &dataCurrentDirName[0]; |
| return; |
| } |
| |
| LOG(INFO) << "Staged install complete."; |
| } |
| /* |
| * Process a staged operation if there is one. |
| */ |
| static void processStagedOperation(const std::string& dataStagedDirName, |
| const std::string& dataCurrentDirName) { |
| PathStatus dataStagedDirStatus = checkPath(dataStagedDirName); |
| |
| // Exit early for the common case. |
| if (dataStagedDirStatus == NONE) { |
| LOG(DEBUG) << "No staged time zone operation."; |
| return; |
| } |
| |
| // Check known directory names are in a good starting state. |
| if (dataStagedDirStatus != IS_DIR) { |
| LOG(WARNING) << "Staged distro dir " << dataStagedDirName |
| << " could not be accessed or is not a directory." |
| << " stagedDirStatus=" << dataStagedDirStatus; |
| return; |
| } |
| |
| // dataStagedDirStatus == IS_DIR. |
| |
| // Work out whether there is anything currently installed. |
| PathStatus dataCurrentDirStatus = checkPath(dataCurrentDirName); |
| if (dataCurrentDirStatus == ERR) { |
| LOG(WARNING) << "Current install dir " << dataCurrentDirName << " could not be accessed" |
| << " dataCurrentDirStatus=" << dataCurrentDirStatus; |
| return; |
| } |
| |
| // We must perform the staged operation. |
| |
| // Check to see if the staged directory contains an uninstall or an install operation. |
| std::string uninstallTombStoneFile(dataStagedDirName); |
| uninstallTombStoneFile += UNINSTALL_TOMBSTONE_FILE_NAME; |
| int uninstallTombStoneFileStatus = checkPath(uninstallTombStoneFile); |
| if (uninstallTombStoneFileStatus != IS_REG && uninstallTombStoneFileStatus != NONE) { |
| // Error case. |
| LOG(WARNING) << "Unable to determine if the staged operation is an uninstall."; |
| return; |
| } |
| if (uninstallTombStoneFileStatus == IS_REG) { |
| handleStagedUninstall(dataStagedDirName, dataCurrentDirName, dataCurrentDirStatus); |
| } else { |
| // uninstallTombStoneFileStatus == NONE meaning this is a staged install. |
| handleStagedInstall(dataStagedDirName, dataCurrentDirName, dataCurrentDirStatus); |
| } |
| } |
| |
| /* |
| * After a platform update it is likely that timezone data found on the system partition will be |
| * newer than the version found in the data partition. This tool detects this case and removes the |
| * version in /data. |
| * |
| * Note: This code is related to code in com.android.server.updates.TzDataInstallReceiver. The |
| * paths for the metadata and current timezone data must match. |
| * |
| * Typically on device the two args will be: |
| * /system/usr/share/zoneinfo /data/misc/zoneinfo |
| * |
| * See usage() for usage notes. |
| */ |
| int main(int argc, char* argv[]) { |
| if (argc != 3) { |
| usage(); |
| return 1; |
| } |
| |
| const char* systemZoneInfoDir = argv[1]; |
| const char* dataZoneInfoDir = argv[2]; |
| |
| std::string dataStagedDirName(dataZoneInfoDir); |
| dataStagedDirName += STAGED_DIR_NAME; |
| |
| std::string dataCurrentDirName(dataZoneInfoDir); |
| dataCurrentDirName += CURRENT_DIR_NAME; |
| |
| // Check for an process any staged operation. |
| // If the staged operation could not be handled we still have to validate the current installed |
| // directory so we do not check for errors and do not quit early. |
| processStagedOperation(dataStagedDirName, dataCurrentDirName); |
| |
| // Check the distro directory exists. If it does not, exit quickly: nothing to do. |
| PathStatus dataCurrentDirStatus = checkPath(dataCurrentDirName); |
| if (dataCurrentDirStatus == NONE) { |
| LOG(INFO) << "timezone distro dir " << dataCurrentDirName |
| << " does not exist. No action required."; |
| return 0; |
| } |
| |
| // If the distro directory path is not a directory or we can't stat() the path, exit with a |
| // warning: either there's a problem accessing storage or the world is not as it should be; |
| // nothing to do. |
| if (dataCurrentDirStatus != IS_DIR) { |
| LOG(WARNING) << "Current distro dir " << dataCurrentDirName |
| << " could not be accessed or is not a directory. result=" << dataCurrentDirStatus; |
| return 2; |
| } |
| |
| // Check the installed distro version. |
| std::string distroVersionFileName(dataCurrentDirName); |
| distroVersionFileName += DISTRO_VERSION_FILENAME; |
| std::vector<char> distroVersion; |
| distroVersion.reserve(DISTRO_VERSION_LENGTH); |
| bool distroVersionReadOk = |
| readBytes(distroVersionFileName, distroVersion.data(), DISTRO_VERSION_LENGTH); |
| if (!distroVersionReadOk) { |
| LOG(WARNING) << "distro version file " << distroVersionFileName |
| << " does not exist or is too short. Deleting distro dir."; |
| // Implies the contents of the data partition is corrupt in some way. Try to clean up. |
| deleteConfigUpdaterMetadataDir(dataZoneInfoDir); |
| deleteUpdateDistroDir(dataCurrentDirName); |
| return 3; |
| } |
| |
| if (!checkValidDistroVersion(distroVersion.data())) { |
| LOG(WARNING) << "distro version file " << distroVersionFileName |
| << " is not valid. Deleting distro dir."; |
| // Implies the contents of the data partition is corrupt in some way. Try to clean up. |
| deleteConfigUpdaterMetadataDir(dataZoneInfoDir); |
| deleteUpdateDistroDir(dataCurrentDirName); |
| return 4; |
| } |
| |
| std::string actualDistroVersion = |
| std::string(distroVersion.data(), SUPPORTED_DISTRO_VERSION_LEN); |
| // Check the first 3 bytes of the distro version: these are the major version (e.g. 001). |
| // It must match the one we support exactly to be ok. |
| if (strncmp( |
| &distroVersion[0], |
| SUPPORTED_DISTRO_MAJOR_VERSION, |
| SUPPORTED_DISTRO_MAJOR_VERSION_LEN) != 0) { |
| |
| LOG(INFO) << "distro version file " << distroVersionFileName |
| << " major version is not the required version " << SUPPORTED_DISTRO_MAJOR_VERSION |
| << ", was \"" << actualDistroVersion << "\". Deleting distro dir."; |
| // This implies there has been an OTA and the installed distro is not compatible with the |
| // new version of Android. Remove the installed distro. |
| deleteConfigUpdaterMetadataDir(dataZoneInfoDir); |
| deleteUpdateDistroDir(dataCurrentDirName); |
| return 5; |
| } |
| |
| // Check the last 3 bytes of the distro version: these are the minor version (e.g. 001). |
| // If the version in the distro is < the minor version required by this device it cannot be |
| // used. |
| if (strncmp( |
| &distroVersion[4], |
| SUPPORTED_DISTRO_MINOR_VERSION, |
| SUPPORTED_DISTRO_MINOR_VERSION_LEN) < 0) { |
| |
| LOG(INFO) << "distro version file " << distroVersionFileName |
| << " minor version is not the required version " << SUPPORTED_DISTRO_MINOR_VERSION |
| << ", was \"" << actualDistroVersion << "\". Deleting distro dir."; |
| // This implies there has been an OTA and the installed distro is not compatible with the |
| // new version of Android. Remove the installed distro. |
| deleteConfigUpdaterMetadataDir(dataZoneInfoDir); |
| deleteUpdateDistroDir(dataCurrentDirName); |
| return 5; |
| } |
| |
| // Read the system rules version out of the /system tzdata file. |
| std::string systemTzDataFileName(systemZoneInfoDir); |
| systemTzDataFileName += TZDATA_FILENAME; |
| std::vector<char> systemTzDataHeader; |
| systemTzDataHeader.reserve(TZ_HEADER_LENGTH); |
| bool systemFileExists = |
| readBytes(systemTzDataFileName, systemTzDataHeader.data(), TZ_HEADER_LENGTH); |
| if (!systemFileExists) { |
| // Implies the contents of the system partition is corrupt in some way. Nothing we can do. |
| LOG(WARNING) << systemTzDataFileName << " does not exist or could not be opened"; |
| return 6; |
| } |
| if (!checkValidTzDataHeader(systemTzDataFileName, systemTzDataHeader.data())) { |
| // Implies the contents of the system partition is corrupt in some way. Nothing we can do. |
| LOG(WARNING) << systemTzDataFileName << " does not have a valid header."; |
| return 7; |
| } |
| |
| // Compare the distro rules version against the system rules version. |
| if (strncmp( |
| &systemTzDataHeader[TZ_DATA_HEADER_PREFIX_LEN], |
| &distroVersion[DISTRO_VERSION_RULES_IDX], |
| RULES_VERSION_LEN) <= 0) { |
| LOG(INFO) << "Found an installed distro but it is valid. No action taken."; |
| // Implies there is an installed update, but it is good. |
| return 0; |
| } |
| |
| // Implies there has been an OTA and the system version of the timezone rules is now newer |
| // than the version installed in /data. Remove the installed distro. |
| LOG(INFO) << "timezone distro in " << dataCurrentDirName << " is older than data in " |
| << systemTzDataFileName << "; fixing..."; |
| |
| deleteConfigUpdaterMetadataDir(dataZoneInfoDir); |
| deleteUpdateDistroDir(dataCurrentDirName); |
| return 0; |
| } |