pollymc/application/UpdateController.cpp

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#include <QFile>
#include <QMessageBox>
#include <FileSystem.h>
#include <updater/GoUpdate.h>
#include "UpdateController.h"
#include <QApplication>
#include <thread>
#include <chrono>
#include <LocalPeer.h>
// from <sys/stat.h>
#ifndef S_IRUSR
#define __S_IREAD 0400 /* Read by owner. */
#define __S_IWRITE 0200 /* Write by owner. */
#define __S_IEXEC 0100 /* Execute by owner. */
#define S_IRUSR __S_IREAD /* Read by owner. */
#define S_IWUSR __S_IWRITE /* Write by owner. */
#define S_IXUSR __S_IEXEC /* Execute by owner. */
#define S_IRGRP (S_IRUSR >> 3) /* Read by group. */
#define S_IWGRP (S_IWUSR >> 3) /* Write by group. */
#define S_IXGRP (S_IXUSR >> 3) /* Execute by group. */
#define S_IROTH (S_IRGRP >> 3) /* Read by others. */
#define S_IWOTH (S_IWGRP >> 3) /* Write by others. */
#define S_IXOTH (S_IXGRP >> 3) /* Execute by others. */
#endif
static QFile::Permissions unixModeToPermissions(const int mode)
{
QFile::Permissions perms;
if (mode & S_IRUSR)
{
perms |= QFile::ReadUser;
}
if (mode & S_IWUSR)
{
perms |= QFile::WriteUser;
}
if (mode & S_IXUSR)
{
perms |= QFile::ExeUser;
}
if (mode & S_IRGRP)
{
perms |= QFile::ReadGroup;
}
if (mode & S_IWGRP)
{
perms |= QFile::WriteGroup;
}
if (mode & S_IXGRP)
{
perms |= QFile::ExeGroup;
}
if (mode & S_IROTH)
{
perms |= QFile::ReadOther;
}
if (mode & S_IWOTH)
{
perms |= QFile::WriteOther;
}
if (mode & S_IXOTH)
{
perms |= QFile::ExeOther;
}
return perms;
}
static const QLatin1String liveCheckFile("live.check");
UpdateController::UpdateController(QWidget * parent, const QString& root, const QString updateFilesDir, GoUpdate::OperationList operations)
{
m_parent = parent;
m_root = root;
m_updateFilesDir = updateFilesDir;
m_operations = operations;
}
void UpdateController::installUpdates()
{
qint64 pid = -1;
QStringList args;
bool started = false;
qDebug() << "Installing updates.";
#ifdef Q_OS_WIN
QString finishCmd = QApplication::applicationFilePath();
#elif defined Q_OS_LINUX
QString finishCmd = FS::PathCombine(m_root, "MultiMC");
#elif defined Q_OS_MAC
QString finishCmd = QApplication::applicationFilePath();
#else
#error Unsupported operating system.
#endif
QString backupPath = FS::PathCombine(m_root, "update", "backup");
QDir origin(m_root);
// clean up the backup folder. it should be empty before we start
if(!FS::deletePath(backupPath))
{
qWarning() << "couldn't remove previous backup folder" << backupPath;
}
// and it should exist.
if(!FS::ensureFolderPathExists(backupPath))
{
qWarning() << "couldn't create folder" << backupPath;
return;
}
bool useXPHack = false;
QString exePath;
QString exeOrigin;
QString exeBackup;
// perform the update operations
for(auto op: m_operations)
{
switch(op.type)
{
// replace = move original out to backup, if it exists, move the new file in its place
case GoUpdate::Operation::OP_REPLACE:
{
#ifdef Q_OS_WIN32
// hack for people renaming the .exe because ... reasons :)
if(op.destination == "MultiMC.exe")
{
op.destination = QFileInfo(QApplication::applicationFilePath()).fileName();
}
#endif
QFileInfo destination (FS::PathCombine(m_root, op.destination));
#ifdef Q_OS_WIN32
if(QSysInfo::windowsVersion() < QSysInfo::WV_VISTA)
{
if(destination.fileName() == "MultiMC.exe")
{
QDir rootDir(m_root);
exeOrigin = rootDir.relativeFilePath(op.source);
exePath = rootDir.relativeFilePath(op.destination);
exeBackup = rootDir.relativeFilePath(FS::PathCombine(backupPath, destination.fileName()));
useXPHack = true;
continue;
}
}
#endif
if(destination.exists())
{
QString backupName = op.destination;
backupName.replace('/', '_');
QString backupFilePath = FS::PathCombine(backupPath, backupName);
if(!QFile::rename(destination.absoluteFilePath(), backupFilePath))
{
qWarning() << "Couldn't move:" << destination.absoluteFilePath() << "to" << backupFilePath;
m_failedOperationType = Replace;
m_failedFile = op.destination;
fail();
return;
}
BackupEntry be;
be.original = destination.absoluteFilePath();
be.backup = backupFilePath;
be.update = op.source;
m_replace_backups.append(be);
}
// make sure the folder we are putting this into exists
if(!FS::ensureFilePathExists(destination.absoluteFilePath()))
{
qWarning() << "REPLACE: Couldn't create folder:" << destination.absoluteFilePath();
m_failedOperationType = Replace;
m_failedFile = op.destination;
fail();
return;
}
// now move the new file in
if(!QFile::rename(op.source, destination.absoluteFilePath()))
{
qWarning() << "REPLACE: Couldn't move:" << op.source << "to" << destination.absoluteFilePath();
m_failedOperationType = Replace;
m_failedFile = op.destination;
fail();
return;
}
QFile::setPermissions(destination.absoluteFilePath(), unixModeToPermissions(op.destinationMode));
}
break;
// delete = move original to backup
case GoUpdate::Operation::OP_DELETE:
{
QString destFilePath = FS::PathCombine(m_root, op.destination);
if(QFile::exists(destFilePath))
{
QString backupName = op.destination;
backupName.replace('/', '_');
QString trashFilePath = FS::PathCombine(backupPath, backupName);
if(!QFile::rename(destFilePath, trashFilePath))
{
qWarning() << "DELETE: Couldn't move:" << op.destination << "to" << trashFilePath;
m_failedFile = op.destination;
m_failedOperationType = Delete;
fail();
return;
}
BackupEntry be;
be.original = destFilePath;
be.backup = trashFilePath;
m_delete_backups.append(be);
}
}
break;
}
}
// try to start the new binary
args = qApp->arguments();
args.removeFirst();
// on old Windows, do insane things... no error checking here, this is just to have something.
if(useXPHack)
{
QString script;
auto nativePath = QDir::toNativeSeparators(exePath);
auto nativeOriginPath = QDir::toNativeSeparators(exeOrigin);
auto nativeBackupPath = QDir::toNativeSeparators(exeBackup);
// so we write this vbscript thing...
QTextStream out(&script);
out << "WScript.Sleep 1000\n";
out << "Set fso=CreateObject(\"Scripting.FileSystemObject\")\n";
out << "Set shell=CreateObject(\"WScript.Shell\")\n";
out << "fso.MoveFile \"" << nativePath << "\", \"" << nativeBackupPath << "\"\n";
out << "fso.MoveFile \"" << nativeOriginPath << "\", \"" << nativePath << "\"\n";
out << "shell.Run \"" << nativePath << "\"\n";
QString scriptPath = FS::PathCombine(m_root, "update", "update.vbs");
// we save it
QFile scriptFile(scriptPath);
scriptFile.open(QIODevice::WriteOnly);
scriptFile.write(script.toLocal8Bit().replace("\n", "\r\n"));
scriptFile.close();
// we run it
started = QProcess::startDetached("wscript", {scriptPath}, m_root);
// and we quit. conscious thought.
qApp->quit();
return;
}
bool doLiveCheck = true;
bool startFailed = false;
// remove live check file, if any
if(QFile::exists(liveCheckFile))
{
if(!QFile::remove(liveCheckFile))
{
qWarning() << "Couldn't remove the" << liveCheckFile << "file! We will proceed without :(";
doLiveCheck = false;
}
}
if(doLiveCheck)
{
if(!args.contains("--alive"))
{
args.append("--alive");
}
}
// start the updated application
started = QProcess::startDetached(finishCmd, args, QDir::currentPath(), &pid);
// much dumber check - just find out if the call
if(!started || pid == -1)
{
qWarning() << "Couldn't start new process properly!";
startFailed = true;
}
if(!startFailed && doLiveCheck)
{
int attempts = 0;
while(attempts < 10)
{
attempts++;
QString key;
std::this_thread::sleep_for(std::chrono::milliseconds(250));
if(!QFile::exists(liveCheckFile))
{
qWarning() << "Couldn't find the" << liveCheckFile << "file!";
startFailed = true;
continue;
}
try
{
key = QString::fromUtf8(FS::read(liveCheckFile));
auto id = ApplicationId::fromRawString(key);
LocalPeer peer(nullptr, id);
if(peer.isClient())
{
startFailed = false;
qDebug() << "Found process started with key " << key;
break;
}
else
{
startFailed = true;
qDebug() << "Process started with key " << key << "apparently died or is not reponding...";
break;
}
}
catch(Exception e)
{
qWarning() << "Couldn't read the" << liveCheckFile << "file!";
startFailed = true;
continue;
}
}
}
if(startFailed)
{
m_failedOperationType = Start;
fail();
return;
}
else
{
origin.rmdir(m_updateFilesDir);
qApp->quit();
return;
}
}
void UpdateController::fail()
{
qWarning() << "Update failed!";
QString msg;
bool doRollback = false;
QString failTitle = QObject::tr("Update failed!");
QString rollFailTitle = QObject::tr("Rollback failed!");
switch (m_failedOperationType)
{
case Replace:
{
msg = QObject::tr("Couldn't replace file %1. Changes will be reverted.\n"
"See the MultiMC log file for details.").arg(m_failedFile);
doRollback = true;
QMessageBox::critical(m_parent, failTitle, msg);
break;
}
case Delete:
{
msg = QObject::tr("Couldn't remove file %1. Changes will be reverted.\n"
"See the MultiMC log file for details.").arg(m_failedFile);
doRollback = true;
QMessageBox::critical(m_parent, failTitle, msg);
break;
}
case Start:
{
msg = QObject::tr("The new version didn't start or is too old and doesn't respond to startup checks.\n"
"\n"
"Roll back to previous version?");
auto result = QMessageBox::critical(
m_parent,
failTitle,
msg,
QMessageBox::Yes | QMessageBox::No,
QMessageBox::Yes
);
doRollback = (result == QMessageBox::Yes);
break;
}
case Nothing:
default:
return;
}
if(doRollback)
{
auto rollbackOK = rollback();
if(!rollbackOK)
{
msg = QObject::tr("The rollback failed too.\n"
"You will have to repair MultiMC manually.\n"
"Please let us know why and how this happened.").arg(m_failedFile);
QMessageBox::critical(m_parent, rollFailTitle, msg);
qApp->quit();
}
}
else
{
qApp->quit();
}
}
bool UpdateController::rollback()
{
bool revertOK = true;
// if the above failed, roll back changes
for(auto backup:m_replace_backups)
{
qWarning() << "restoring" << backup.original << "from" << backup.backup;
if(!QFile::rename(backup.original, backup.update))
{
revertOK = false;
qWarning() << "moving new" << backup.original << "back to" << backup.update << "failed!";
continue;
}
if(!QFile::rename(backup.backup, backup.original))
{
revertOK = false;
qWarning() << "restoring" << backup.original << "failed!";
}
}
for(auto backup:m_delete_backups)
{
qWarning() << "restoring" << backup.original << "from" << backup.backup;
if(!QFile::rename(backup.backup, backup.original))
{
revertOK = false;
qWarning() << "restoring" << backup.original << "failed!";
}
}
return revertOK;
}