pollymc/api/logic/minecraft/legacy/LegacyUpgradeTask.cpp

#include "LegacyUpgradeTask.h"
#include "BaseInstanceProvider.h"
#include "settings/INISettingsObject.h"
#include "FileSystem.h"
#include "NullInstance.h"
#include "pathmatcher/RegexpMatcher.h"
#include <QtConcurrentRun>
#include "LegacyInstance.h"
#include "minecraft/MinecraftInstance.h"
#include "minecraft/MinecraftProfile.h"

LegacyUpgradeTask::LegacyUpgradeTask(SettingsObjectPtr settings, const QString & stagingPath, InstancePtr origInstance, const QString & newName)
{
	m_globalSettings = settings;
	m_stagingPath = stagingPath;
	m_origInstance = origInstance;
	m_newName = newName;
}

void LegacyUpgradeTask::executeTask()
{
	setStatus(tr("Copying instance %1").arg(m_origInstance->name()));

	FS::copy folderCopy(m_origInstance->instanceRoot(), m_stagingPath);
	folderCopy.followSymlinks(true);

	m_copyFuture = QtConcurrent::run(QThreadPool::globalInstance(), folderCopy);
	connect(&m_copyFutureWatcher, &QFutureWatcher<bool>::finished, this, &LegacyUpgradeTask::copyFinished);
	connect(&m_copyFutureWatcher, &QFutureWatcher<bool>::canceled, this, &LegacyUpgradeTask::copyAborted);
	m_copyFutureWatcher.setFuture(m_copyFuture);
}

static QString decideVersion(const QString& currentVersion, const QString& intendedVersion)
{
	if(intendedVersion != currentVersion)
	{
		if(!intendedVersion.isEmpty())
		{
			return intendedVersion;
		}
		else if(!currentVersion.isEmpty())
		{
			return currentVersion;
		}
	}
	else
	{
		if(!intendedVersion.isEmpty())
		{
			return intendedVersion;
		}
	}
	// TODO: possibly add fallback to the old jar/classfile analysis method from MultiMC4
	return QString();
}

void LegacyUpgradeTask::copyFinished()
{
	auto successful = m_copyFuture.result();
	if(!successful)
	{
		emitFailed(tr("Instance folder copy failed."));
		return;
	}
	auto legacyInst = std::dynamic_pointer_cast<LegacyInstance>(m_origInstance);

	auto instanceSettings = std::make_shared<INISettingsObject>(FS::PathCombine(m_stagingPath, "instance.cfg"));
	instanceSettings->registerSetting("InstanceType", "Legacy");
	instanceSettings->set("InstanceType", "OneSix");
	std::shared_ptr<MinecraftInstance> inst(new MinecraftInstance(m_globalSettings, instanceSettings, m_stagingPath));
	inst->setName(m_newName);
	inst->init();

	QString preferredVersionNumber = decideVersion(legacyInst->currentVersionId(), legacyInst->intendedVersionId());
	if(preferredVersionNumber.isNull())
	{
		// FIXME: let the user decide
		emitFailed(tr("Could not decide Minecraft version."));
		return;
	}
	inst->setComponentVersion("net.minecraft", preferredVersionNumber);

	// BUG: reloadProfile should not be necessary, but setComponentVersion voids the profile created by init()!
	inst->reloadProfile();
	auto profile = inst->getMinecraftProfile();

	if(legacyInst->shouldUseCustomBaseJar())
	{
		QString jarPath = legacyInst->customBaseJar();
		qDebug() << "Base jar is custom! : " << jarPath;
		// FIXME: handle case when the jar is unreadable?
		// TODO: check the hash, if it's the same as the upstream jar, do not do this
		profile->installCustomJar(jarPath);
	}

	auto jarMods = legacyInst->getJarMods();
	for(auto & jarMod: jarMods)
	{
		QString modPath = jarMod.filename().absoluteFilePath();
		qDebug() << "jarMod: " << modPath;
		profile->installJarMods({modPath});
	}

	// remove all the extra garbage we no longer need
	auto removeAll = [&](const QString &root, const QStringList &things)
	{
		for(auto &thing : things)
		{
			auto removePath = FS::PathCombine(root, thing);
			QFileInfo stat(removePath);
			if(stat.isDir())
			{
				FS::deletePath(removePath);
			}
			else
			{
				QFile::remove(removePath);
			}
		}
	};
	QStringList rootRemovables = {"modlist", "version", "instMods"};
	QStringList mcRemovables = {"bin", "MultiMCLauncher.jar", "icon.png"};
	removeAll(inst->instanceRoot(), rootRemovables);
	removeAll(inst->minecraftRoot(), mcRemovables);
	emitSucceeded();
}

void LegacyUpgradeTask::copyAborted()
{
	emitFailed(tr("Instance folder copy has been aborted."));
	return;
}