NOISSUE fix multiple issues in ATLauncher integration

11 files changed, 170 insertions, 100 deletions

diff --git a/api/logic/InstanceImportTask.cpp b/api/logic/InstanceImportTask.cpp
index bd98f9d4..fe2cdd75 100644
--- a/api/logic/InstanceImportTask.cpp
+++ b/api/logic/InstanceImportTask.cpp
@@ -138,7 +138,7 @@ void InstanceImportTask::processZipPack()
 void InstanceImportTask::extractFinished()
 {
     m_packZip.reset();
-    if (m_extractFuture.result().isEmpty())
+    if (!m_extractFuture.result())
     {
         emitFailed(tr("Failed to extract modpack"));
         return;
diff --git a/api/logic/InstanceImportTask.h b/api/logic/InstanceImportTask.h
index db658808..7291324d 100644
--- a/api/logic/InstanceImportTask.h
+++ b/api/logic/InstanceImportTask.h
@@ -24,6 +24,8 @@
 #include "settings/SettingsObject.h"
 #include "QObjectPtr.h"
 
+#include <nonstd/optional>
+
 class QuaZip;
 namespace Flame
 {
@@ -60,8 +62,8 @@ private: /* data */
     QString m_archivePath;
     bool m_downloadRequired = false;
     std::unique_ptr<QuaZip> m_packZip;
-    QFuture<QStringList> m_extractFuture;
-    QFutureWatcher<QStringList> m_extractFutureWatcher;
+    QFuture<nonstd::optional<QStringList>> m_extractFuture;
+    QFutureWatcher<nonstd::optional<QStringList>> m_extractFutureWatcher;
     enum class ModpackType{
         Unknown,
         MultiMC,
diff --git a/api/logic/MMCZip.cpp b/api/logic/MMCZip.cpp
index 50b95c8e..b25c61e7 100644
--- a/api/logic/MMCZip.cpp
+++ b/api/logic/MMCZip.cpp
@@ -208,16 +208,27 @@ bool MMCZip::findFilesInZip(QuaZip * zip, const QString & what, QStringList & re
 
 
 // ours
-QStringList MMCZip::extractSubDir(QuaZip *zip, const QString & subdir, const QString &target)
+nonstd::optional<QStringList> MMCZip::extractSubDir(QuaZip *zip, const QString & subdir, const QString &target)
 {
     QDir directory(target);
     QStringList extracted;
+
     qDebug() << "Extracting subdir" << subdir << "from" << zip->getZipName() << "to" << target;
-    if (!zip->goToFirstFile())
+    auto numEntries = zip->getEntriesCount();
+    if(numEntries < 0) {
+        qWarning() << "Failed to enumerate files in archive";
+        return nonstd::nullopt;
+    }
+    else if(numEntries == 0) {
+        qDebug() << "Extracting empty archives seems odd...";
+        return extracted;
+    }
+    else if (!zip->goToFirstFile())
     {
         qWarning() << "Failed to seek to first file in zip";
-        return QStringList();
+        return nonstd::nullopt;
     }
+
     do
     {
         QString name = zip->getCurrentFileName();
@@ -235,7 +246,7 @@ QStringList MMCZip::extractSubDir(QuaZip *zip, const QString & subdir, const QSt
         {
             qWarning() << "Failed to extract file" << name << "to" << absFilePath;
             JlCompress::removeFile(extracted);
-            return QStringList();
+            return nonstd::nullopt;
         }
         extracted.append(absFilePath);
         qDebug() << "Extracted file" << name;
@@ -250,23 +261,35 @@ bool MMCZip::extractRelFile(QuaZip *zip, const QString &file, const QString &tar
 }
 
 // ours
-QStringList MMCZip::extractDir(QString fileCompressed, QString dir)
+nonstd::optional<QStringList> MMCZip::extractDir(QString fileCompressed, QString dir)
 {
     QuaZip zip(fileCompressed);
     if (!zip.open(QuaZip::mdUnzip))
     {
-        return {};
+        // check if this is a minimum size empty zip file...
+        QFileInfo fileInfo(fileCompressed);
+        if(fileInfo.size() == 22) {
+            return QStringList();
+        }
+        qWarning() << "Could not open archive for unzipping:" << fileCompressed << "Error:" << zip.getZipError();;
+        return nonstd::nullopt;
     }
     return MMCZip::extractSubDir(&zip, "", dir);
 }
 
 // ours
-QStringList MMCZip::extractDir(QString fileCompressed, QString subdir, QString dir)
+nonstd::optional<QStringList> MMCZip::extractDir(QString fileCompressed, QString subdir, QString dir)
 {
     QuaZip zip(fileCompressed);
     if (!zip.open(QuaZip::mdUnzip))
     {
-        return {};
+        // check if this is a minimum size empty zip file...
+        QFileInfo fileInfo(fileCompressed);
+        if(fileInfo.size() == 22) {
+            return QStringList();
+        }
+        qWarning() << "Could not open archive for unzipping:" << fileCompressed << "Error:" << zip.getZipError();;
+        return nonstd::nullopt;
     }
     return MMCZip::extractSubDir(&zip, subdir, dir);
 }
@@ -277,7 +300,13 @@ bool MMCZip::extractFile(QString fileCompressed, QString file, QString target)
     QuaZip zip(fileCompressed);
     if (!zip.open(QuaZip::mdUnzip))
     {
-        return {};
+        // check if this is a minimum size empty zip file...
+        QFileInfo fileInfo(fileCompressed);
+        if(fileInfo.size() == 22) {
+            return true;
+        }
+        qWarning() << "Could not open archive for unzipping:" << fileCompressed << "Error:" << zip.getZipError();
+        return false;
     }
     return MMCZip::extractRelFile(&zip, file, target);
 }
diff --git a/api/logic/MMCZip.h b/api/logic/MMCZip.h
index beff2e4d..98d9cd5b 100644
--- a/api/logic/MMCZip.h
+++ b/api/logic/MMCZip.h
@@ -24,6 +24,7 @@
 #include "multimc_logic_export.h"
 
 #include <JlCompress.h>
+#include <nonstd/optional>
 
 namespace MMCZip
 {
@@ -57,7 +58,7 @@ namespace MMCZip
     /**
      * Extract a subdirectory from an archive
      */
-    QStringList MULTIMC_LOGIC_EXPORT extractSubDir(QuaZip *zip, const QString & subdir, const QString &target);
+    nonstd::optional<QStringList> MULTIMC_LOGIC_EXPORT extractSubDir(QuaZip *zip, const QString & subdir, const QString &target);
 
     bool MULTIMC_LOGIC_EXPORT extractRelFile(QuaZip *zip, const QString & file, const QString &target);
 
@@ -68,7 +69,7 @@ namespace MMCZip
      * \param dir The directory to extract to, the current directory if left empty.
      * \return The list of the full paths of the files extracted, empty on failure.
      */
-    QStringList MULTIMC_LOGIC_EXPORT extractDir(QString fileCompressed, QString dir);
+    nonstd::optional<QStringList> MULTIMC_LOGIC_EXPORT extractDir(QString fileCompressed, QString dir);
 
     /**
      * Extract a subdirectory from an archive
@@ -78,7 +79,7 @@ namespace MMCZip
      * \param dir The directory to extract to, the current directory if left empty.
      * \return The list of the full paths of the files extracted, empty on failure.
      */
-    QStringList MULTIMC_LOGIC_EXPORT extractDir(QString fileCompressed, QString subdir, QString dir);
+    nonstd::optional<QStringList> MULTIMC_LOGIC_EXPORT extractDir(QString fileCompressed, QString subdir, QString dir);
 
     /**
      * Extract a single file from an archive into a directory
diff --git a/api/logic/minecraft/World.cpp b/api/logic/minecraft/World.cpp
index ddeaa3b6..a2b4dac7 100644
--- a/api/logic/minecraft/World.cpp
+++ b/api/logic/minecraft/World.cpp
@@ -289,7 +289,7 @@ bool World::install(const QString &to, const QString &name)
         {
             return false;
         }
-        ok = !MMCZip::extractSubDir(&zip, m_containerOffsetPath, finalPath).isEmpty();
+        ok = !MMCZip::extractSubDir(&zip, m_containerOffsetPath, finalPath);
     }
     else if(m_containerFile.isDir())
     {
diff --git a/api/logic/modplatform/atlauncher/ATLPackInstallTask.cpp b/api/logic/modplatform/atlauncher/ATLPackInstallTask.cpp
index 9719cef3..faa05e84 100644
--- a/api/logic/modplatform/atlauncher/ATLPackInstallTask.cpp
+++ b/api/logic/modplatform/atlauncher/ATLPackInstallTask.cpp
@@ -31,6 +31,7 @@ bool PackInstallTask::abort()
 
 void PackInstallTask::executeTask()
 {
+    qDebug() << "PackInstallTask::executeTask: " << QThread::currentThreadId();
     auto *netJob = new NetJob("ATLauncher::VersionFetch");
     auto searchUrl = QString(BuildConfig.ATL_DOWNLOAD_SERVER_URL + "packs/%1/versions/%2/Configs.json")
             .arg(m_pack).arg(m_version_name);
@@ -44,6 +45,7 @@ void PackInstallTask::executeTask()
 
 void PackInstallTask::onDownloadSucceeded()
 {
+    qDebug() << "PackInstallTask::onDownloadSucceeded: " << QThread::currentThreadId();
     jobPtr.reset();
 
     QJsonParseError parse_error;
@@ -84,7 +86,7 @@ void PackInstallTask::onDownloadSucceeded()
     minecraftVersion = ver;
 
     if(m_version.noConfigs) {
-        installMods();
+        downloadMods();
     }
     else {
         installConfigs();
@@ -93,6 +95,7 @@ void PackInstallTask::onDownloadSucceeded()
 
 void PackInstallTask::onDownloadFailed(QString reason)
 {
+    qDebug() << "PackInstallTask::onDownloadFailed: " << QThread::currentThreadId();
     jobPtr.reset();
     emitFailed(reason);
 }
@@ -360,6 +363,7 @@ bool PackInstallTask::createPackComponent(QString instanceRoot, std::shared_ptr<
 
 void PackInstallTask::installConfigs()
 {
+    qDebug() << "PackInstallTask::installConfigs: " << QThread::currentThreadId();
     setStatus(tr("Downloading configs..."));
     jobPtr.reset(new NetJob(tr("Config download")));
 
@@ -392,6 +396,7 @@ void PackInstallTask::installConfigs()
 
 void PackInstallTask::extractConfigs()
 {
+    qDebug() << "PackInstallTask::extractConfigs: " << QThread::currentThreadId();
     setStatus(tr("Extracting configs..."));
 
     QDir extractDir(m_stagingPath);
@@ -406,7 +411,7 @@ void PackInstallTask::extractConfigs()
     m_extractFuture = QtConcurrent::run(QThreadPool::globalInstance(), MMCZip::extractDir, archivePath, extractDir.absolutePath() + "/minecraft");
     connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::finished, this, [&]()
     {
-        installMods();
+        downloadMods();
     });
     connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::canceled, this, [&]()
     {
@@ -415,8 +420,9 @@ void PackInstallTask::extractConfigs()
     m_extractFutureWatcher.setFuture(m_extractFuture);
 }
 
-void PackInstallTask::installMods()
+void PackInstallTask::downloadMods()
 {
+    qDebug() << "PackInstallTask::installMods: " << QThread::currentThreadId();
     setStatus(tr("Downloading mods..."));
 
     jarmods.clear();
@@ -464,12 +470,17 @@ void PackInstallTask::installMods()
         else {
             auto relpath = getDirForModType(mod.type, mod.type_raw);
             if(relpath == Q_NULLPTR) continue;
-            auto path = FS::PathCombine(m_stagingPath, "minecraft", relpath, mod.file);
 
-            qDebug() << "Will download" << url << "to" << path;
-            auto dl = Net::Download::makeFile(url, path);
+            auto entry = ENV.metacache()->resolveEntry("ATLauncherPacks", cacheName);
+            entry->setStale(true);
+
+            auto dl = Net::Download::makeCached(url, entry);
             jobPtr->addNetAction(dl);
 
+            auto path = FS::PathCombine(m_stagingPath, "minecraft", relpath, mod.file);
+            qDebug() << "Will download" << url << "to" << path;
+            modsToCopy[entry->getFullPath()] = path;
+
             if(mod.type == ModType::Forge) {
                 auto vlist = ENV.metadataIndex()->get("net.minecraftforge");
                 if(vlist)
@@ -493,11 +504,7 @@ void PackInstallTask::installMods()
         }
     }
 
-    connect(jobPtr.get(), &NetJob::succeeded, this, [&]()
-    {
-        jobPtr.reset();
-        extractMods();
-    });
+    connect(jobPtr.get(), &NetJob::succeeded, this, &PackInstallTask::onModsDownloaded);
     connect(jobPtr.get(), &NetJob::failed, [&](QString reason)
     {
         jobPtr.reset();
@@ -511,88 +518,103 @@ void PackInstallTask::installMods()
     jobPtr->start();
 }
 
-void PackInstallTask::extractMods()
-{
-    setStatus(tr("Extracting mods..."));
+void PackInstallTask::onModsDownloaded() {
+    qDebug() << "PackInstallTask::onModsDownloaded: " << QThread::currentThreadId();
+    jobPtr.reset();
 
-    if(modsToExtract.isEmpty()) {
-        decompMods();
-        return;
+    if(modsToExtract.size() || modsToDecomp.size() || modsToCopy.size()) {
+        m_modExtractFuture = QtConcurrent::run(QThreadPool::globalInstance(), this, &PackInstallTask::extractMods, modsToExtract, modsToDecomp, modsToCopy);
+        connect(&m_modExtractFutureWatcher, &QFutureWatcher<QStringList>::finished, this, &PackInstallTask::onModsExtracted);
+        connect(&m_modExtractFutureWatcher, &QFutureWatcher<QStringList>::canceled, this, [&]()
+        {
+            emitAborted();
+        });
+        m_modExtractFutureWatcher.setFuture(m_modExtractFuture);
     }
-
-    auto modPath = modsToExtract.firstKey();
-    auto mod = modsToExtract.value(modPath);
-
-    QString extractToDir;
-    if(mod.type == ModType::Extract) {
-        extractToDir = getDirForModType(mod.extractTo, mod.extractTo_raw);
+    else {
+        install();
     }
-    else if(mod.type == ModType::TexturePackExtract) {
-        extractToDir = FS::PathCombine("texturepacks", "extracted");
+}
+
+void PackInstallTask::onModsExtracted() {
+    qDebug() << "PackInstallTask::onModsExtracted: " << QThread::currentThreadId();
+    if(m_modExtractFuture.result()) {
+        install();
     }
-    else if(mod.type == ModType::ResourcePackExtract) {
-        extractToDir = FS::PathCombine("resourcepacks", "extracted");
+    else {
+        emitFailed(tr("Failed to extract mods..."));
     }
+}
 
-    qDebug() << "Extracting " + mod.file + " to " + extractToDir;
+bool PackInstallTask::extractMods(
+    const QMap<QString, VersionMod> &toExtract,
+    const QMap<QString, VersionMod> &toDecomp,
+    const QMap<QString, QString> &toCopy
+) {
+    qDebug() << "PackInstallTask::extractMods: " << QThread::currentThreadId();
 
-    QDir extractDir(m_stagingPath);
-    auto extractToPath = FS::PathCombine(extractDir.absolutePath(), "minecraft", extractToDir);
-
-    QString folderToExtract = "";
-    if(mod.type == ModType::Extract) {
-        folderToExtract = mod.extractFolder;
-    }
+    setStatus(tr("Extracting mods..."));
+    for (auto iter = toExtract.begin(); iter != toExtract.end(); iter++) {
+        auto &modPath = iter.key();
+        auto &mod = iter.value();
 
-    m_extractFuture = QtConcurrent::run(QThreadPool::globalInstance(), MMCZip::extractDir, modPath, folderToExtract, extractToPath);
-    connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::finished, this, [&]()
-    {
-        extractMods();
-    });
-    connect(&m_extractFutureWatcher, &QFutureWatcher<QStringList>::canceled, this, [&]()
-    {
-        emitAborted();
-    });
-    m_extractFutureWatcher.setFuture(m_extractFuture);
+        QString extractToDir;
+        if(mod.type == ModType::Extract) {
+            extractToDir = getDirForModType(mod.extractTo, mod.extractTo_raw);
+        }
+        else if(mod.type == ModType::TexturePackExtract) {
+            extractToDir = FS::PathCombine("texturepacks", "extracted");
+        }
+        else if(mod.type == ModType::ResourcePackExtract) {
+            extractToDir = FS::PathCombine("resourcepacks", "extracted");
+        }
 
-    modsToExtract.remove(modPath);
-}
+        QDir extractDir(m_stagingPath);
+        auto extractToPath = FS::PathCombine(extractDir.absolutePath(), "minecraft", extractToDir);
 
-void PackInstallTask::decompMods()
-{
-    setStatus(tr("Extracting 'decomp' mods..."));
+        QString folderToExtract = "";
+        if(mod.type == ModType::Extract) {
+            folderToExtract = mod.extractFolder;
+            folderToExtract.remove(QRegExp("^/"));
+        }
 
-    if(modsToDecomp.isEmpty()) {
-        install();
-        return;
+        qDebug() << "Extracting " + mod.file + " to " + extractToDir;
+        if(!MMCZip::extractDir(modPath, folderToExtract, extractToPath)) {
+            // assume error
+            return false;
+        }
     }
 
-    auto modPath = modsToDecomp.firstKey();
-    auto mod = modsToDecomp.value(modPath);
-
-    auto extractToDir = getDirForModType(mod.decompType, mod.decompType_raw);
-
-    QDir extractDir(m_stagingPath);
-    auto extractToPath = FS::PathCombine(extractDir.absolutePath(), "minecraft", extractToDir, mod.decompFile);
+    for (auto iter = toDecomp.begin(); iter != toDecomp.end(); iter++) {
+        auto &modPath = iter.key();
+        auto &mod = iter.value();
+        auto extractToDir = getDirForModType(mod.decompType, mod.decompType_raw);
 
-    qWarning() << "Extracting " + mod.decompFile + " to " + extractToDir;
+        QDir extractDir(m_stagingPath);
+        auto extractToPath = FS::PathCombine(extractDir.absolutePath(), "minecraft", extractToDir, mod.decompFile);
 
-    m_decompFuture = QtConcurrent::run(QThreadPool::globalInstance(), MMCZip::extractFile, modPath, mod.decompFile, extractToPath);
-    connect(&m_decompFutureWatcher, &QFutureWatcher<bool>::finished, this, [&]()
-    {
-        install();
-    });
-    connect(&m_decompFutureWatcher, &QFutureWatcher<bool>::canceled, this, [&]()
-    {
-        emitAborted();
-    });
-    m_decompFutureWatcher.setFuture(m_decompFuture);
+        qDebug() << "Extracting " + mod.decompFile + " to " + extractToDir;
+        if(!MMCZip::extractFile(modPath, mod.decompFile, extractToPath)) {
+            qWarning() << "Failed to extract" << mod.decompFile;
+            return false;
+        }
+    }
 
-    modsToDecomp.remove(modPath);
+    for (auto iter = toCopy.begin(); iter != toCopy.end(); iter++) {
+        auto &from = iter.key();
+        auto &to = iter.value();
+        FS::copy fileCopyOperation(from, to);
+        if(!fileCopyOperation()) {
+            qWarning() << "Failed to copy" << from << "to" << to;
+            return false;
+        }
+    }
+    return true;
 }
 
 void PackInstallTask::install()
 {
+    qDebug() << "PackInstallTask::install: " << QThread::currentThreadId();
     setStatus(tr("Installing modpack"));
 
     auto instanceConfigPath = FS::PathCombine(m_stagingPath, "instance.cfg");
diff --git a/api/logic/modplatform/atlauncher/ATLPackInstallTask.h b/api/logic/modplatform/atlauncher/ATLPackInstallTask.h
index 12e6bcf5..78544bab 100644
--- a/api/logic/modplatform/atlauncher/ATLPackInstallTask.h
+++ b/api/logic/modplatform/atlauncher/ATLPackInstallTask.h
@@ -11,6 +11,8 @@
 #include "minecraft/PackProfile.h"
 #include "meta/Version.h"
 
+#include <nonstd/optional>
+
 namespace ATLauncher {
 
 class MULTIMC_LOGIC_EXPORT PackInstallTask : public InstanceTask
@@ -30,6 +32,9 @@ private slots:
     void onDownloadSucceeded();
     void onDownloadFailed(QString reason);
 
+    void onModsDownloaded();
+    void onModsExtracted();
+
 private:
     QString getDirForModType(ModType type, QString raw);
     QString getVersionForLoader(QString uid);
@@ -40,9 +45,12 @@ private:
 
     void installConfigs();
     void extractConfigs();
-    void installMods();
-    void extractMods();
-    void decompMods();
+    void downloadMods();
+    bool extractMods(
+        const QMap<QString, VersionMod> &toExtract,
+        const QMap<QString, VersionMod> &toDecomp,
+        const QMap<QString, QString> &toCopy
+    );
     void install();
 
 private:
@@ -55,14 +63,18 @@ private:
 
     QMap<QString, VersionMod> modsToExtract;
     QMap<QString, VersionMod> modsToDecomp;
+    QMap<QString, QString> modsToCopy;
 
     QString archivePath;
     QStringList jarmods;
     Meta::VersionPtr minecraftVersion;
     QMap<QString, Meta::VersionPtr> componentsToInstall;
 
-    QFuture<QStringList> m_extractFuture;
-    QFutureWatcher<QStringList> m_extractFutureWatcher;
+    QFuture<nonstd::optional<QStringList>> m_extractFuture;
+    QFutureWatcher<nonstd::optional<QStringList>> m_extractFutureWatcher;
+
+    QFuture<bool> m_modExtractFuture;
+    QFutureWatcher<bool> m_modExtractFutureWatcher;
 
     QFuture<bool> m_decompFuture;
     QFutureWatcher<bool> m_decompFutureWatcher;
diff --git a/api/logic/modplatform/legacy_ftb/PackInstallTask.h b/api/logic/modplatform/legacy_ftb/PackInstallTask.h
index 1eec1880..7868d1c4 100644
--- a/api/logic/modplatform/legacy_ftb/PackInstallTask.h
+++ b/api/logic/modplatform/legacy_ftb/PackInstallTask.h
@@ -8,6 +8,8 @@
 #include "meta/VersionList.h"
 #include "PackHelpers.h"
 
+#include <nonstd/optional>
+
 namespace LegacyFTB {
 
 class MULTIMC_LOGIC_EXPORT PackInstallTask : public InstanceTask
@@ -40,8 +42,8 @@ private slots:
 private: /* data */
     bool abortable = false;
     std::unique_ptr<QuaZip> m_packZip;
-    QFuture<QStringList> m_extractFuture;
-    QFutureWatcher<QStringList> m_extractFutureWatcher;
+    QFuture<nonstd::optional<QStringList>> m_extractFuture;
+    QFutureWatcher<nonstd::optional<QStringList>> m_extractFutureWatcher;
     NetJobPtr netJobContainer;
     QString archivePath;
 
diff --git a/api/logic/modplatform/technic/SingleZipPackInstallTask.cpp b/api/logic/modplatform/technic/SingleZipPackInstallTask.cpp
index 9be99d06..96e1804d 100644
--- a/api/logic/modplatform/technic/SingleZipPackInstallTask.cpp
+++ b/api/logic/modplatform/technic/SingleZipPackInstallTask.cpp
@@ -79,7 +79,7 @@ void Technic::SingleZipPackInstallTask::downloadProgressChanged(qint64 current,
 void Technic::SingleZipPackInstallTask::extractFinished()
 {
     m_packZip.reset();
-    if (m_extractFuture.result().isEmpty())
+    if (!m_extractFuture.result())
     {
         emitFailed(tr("Failed to extract modpack"));
         return;
diff --git a/api/logic/modplatform/technic/SingleZipPackInstallTask.h b/api/logic/modplatform/technic/SingleZipPackInstallTask.h
index ecf4445a..c56b9e46 100644
--- a/api/logic/modplatform/technic/SingleZipPackInstallTask.h
+++ b/api/logic/modplatform/technic/SingleZipPackInstallTask.h
@@ -25,6 +25,8 @@
 #include <QStringList>
 #include <QUrl>
 
+#include <nonstd/optional>
+
 namespace Technic {
 
 class MULTIMC_LOGIC_EXPORT SingleZipPackInstallTask : public InstanceTask
@@ -51,8 +53,8 @@ private:
     QString m_archivePath;
     NetJobPtr m_filesNetJob;
     std::unique_ptr<QuaZip> m_packZip;
-    QFuture<QStringList> m_extractFuture;
-    QFutureWatcher<QStringList> m_extractFutureWatcher;
+    QFuture<nonstd::optional<QStringList>> m_extractFuture;
+    QFutureWatcher<nonstd::optional<QStringList>> m_extractFutureWatcher;
 };
 
 } // namespace Technic
diff --git a/api/logic/modplatform/technic/SolderPackInstallTask.cpp b/api/logic/modplatform/technic/SolderPackInstallTask.cpp
index a858de49..1d17073c 100644
--- a/api/logic/modplatform/technic/SolderPackInstallTask.cpp
+++ b/api/logic/modplatform/technic/SolderPackInstallTask.cpp
@@ -117,7 +117,7 @@ void Technic::SolderPackInstallTask::downloadSucceeded()
         while (m_modCount > i)
         {
             auto path = FS::PathCombine(m_outputDir.path(), QString("%1").arg(i));
-            if (MMCZip::extractDir(path, extractDir).isEmpty())
+            if (!MMCZip::extractDir(path, extractDir))
             {
                 return false;
             }