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Update to support staging behavior

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The tzdatacheck binary is being modified to support
"staging" of an install / uninstall. tzdatacheck is now
responsible for making time zone distros "live" during
boot. It was previously the responsibility of the
TimeZoneDistroInstaller.

Bug: 31008728
Test: Manual testing
Test: CTS: run cts -m CtsHostTzDataTests

Change-Id: I1d390bf2b383a9505320e3455a20ae640bf83d7b
This commit is contained in:
Neil Fuller 2017-03-22 12:53:02 +00:00
parent d444f8663d
commit ae52ab2acf
1 changed files with 193 additions and 11 deletions
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204
tzdatacheck/tzdatacheck.cpp
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@ -30,6 +30,19 @@
#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";
@ -75,7 +88,6 @@ 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"
@ -184,7 +196,7 @@ static int deleteFn(const char* fpath, const struct stat*, int typeflag, struct
return 0;
}
enum PathStatus { ERR, NONE, IS_DIR, NOT_DIR };
enum PathStatus { ERR, NONE, IS_DIR, IS_REG, UNKNOWN };
static PathStatus checkPath(const std::string& path) {
struct stat buf;
@ -195,7 +207,31 @@ static PathStatus checkPath(const std::string& path) {
}
return NONE;
}
return S_ISDIR(buf.st_mode) ? IS_DIR : NOT_DIR;
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;
}
/*
@ -260,8 +296,7 @@ static void deleteConfigUpdaterMetadataDir(const char* dataZoneInfoDir) {
std::string dataUpdatesDirName(dataZoneInfoDir);
dataUpdatesDirName += "/updates";
LOG(INFO) << "Removing: " << dataUpdatesDirName;
bool deleted = deleteDir(dataUpdatesDirName);
if (!deleted) {
if (!deleteDir(dataUpdatesDirName)) {
LOG(WARNING) << "Deletion of install metadata " << dataUpdatesDirName
<< " was not successful";
}
@ -270,14 +305,151 @@ static void deleteConfigUpdaterMetadataDir(const char* dataZoneInfoDir) {
/*
* Deletes the timezone update distro directory.
*/
static void deleteUpdateDistroDir(std::string& distroDirName) {
static void deleteUpdateDistroDir(const std::string& distroDirName) {
LOG(INFO) << "Removing: " << distroDirName;
bool deleted = deleteDir(distroDirName);
if (!deleted) {
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
@ -300,15 +472,25 @@ int main(int argc, char* argv[]) {
const char* systemZoneInfoDir = argv[1];
const char* dataZoneInfoDir = argv[2];
// Check the distro directory exists. If it does not, exit quickly: nothing to do.
std::string dataStagedDirName(dataZoneInfoDir);
dataStagedDirName += STAGED_DIR_NAME;
std::string dataCurrentDirName(dataZoneInfoDir);
dataCurrentDirName += "/current";
int dataCurrentDirStatus = checkPath(dataCurrentDirName);
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.