NOISSUE add instance-local library storage

Any libraries stored in $instanceroot/libraries/ will override
the libraries from MultiMC's global folders, as long as they are marked 'local'
in the json patch.

13 files changed, 182 insertions, 45 deletions

diff --git a/api/logic/minecraft/GradleSpecifier.h b/api/logic/minecraft/GradleSpecifier.h
index 18308537..b05553bb 100644
--- a/api/logic/minecraft/GradleSpecifier.h
+++ b/api/logic/minecraft/GradleSpecifier.h
@@ -55,18 +55,23 @@ struct GradleSpecifier
 		}
 		return retval;
 	}
+	QString getFileName() const
+	{
+		QString filename = m_artifactId + '-' + m_version;
+		if(!m_classifier.isEmpty())
+		{
+			filename += "-" + m_classifier;
+		}
+		filename += "." + m_extension;
+		return filename;
+	}
 	QString toPath() const
 	{
 		if(!m_valid)
 			return "INVALID";
 		QString path = m_groupId;
 		path.replace('.', '/');
-		path += '/' + m_artifactId + '/' + m_version + '/' + m_artifactId + '-' + m_version;
-		if(!m_classifier.isEmpty())
-		{
-			path += "-" + m_classifier;
-		}
-		path += "." + m_extension;
+		path += '/' + m_artifactId + '/' + m_version + '/' + getFileName();
 		return path;
 	}
 	inline bool valid() const
diff --git a/api/logic/minecraft/Library.cpp b/api/logic/minecraft/Library.cpp
index c516edb7..8bbd5503 100644
--- a/api/logic/minecraft/Library.cpp
+++ b/api/logic/minecraft/Library.cpp
@@ -1,15 +1,31 @@
 #include "Library.h"
+#include "MinecraftInstance.h"
+
 #include <net/Download.h>
 #include <net/ChecksumValidator.h>
 #include <minecraft/forge/ForgeXzDownload.h>
 #include <Env.h>
 #include <FileSystem.h>
 
-void Library::getApplicableFiles(OpSys system, QStringList& jar, QStringList& native, QStringList& native32, QStringList& native64) const
+
+void Library::getApplicableFiles(OpSys system, QStringList& jar, QStringList& native, QStringList& native32,
+								 QStringList& native64, const QString &overridePath) const
 {
+	bool isLocal = (hint() == "local");
 	auto actualPath = [&](QString relPath)
 	{
 		QFileInfo out(FS::PathCombine(storagePrefix(), relPath));
+		if(isLocal && !overridePath.isEmpty())
+		{
+			QString fileName = out.fileName();
+			auto fullPath = FS::PathCombine(overridePath, fileName);
+			qDebug() << fullPath;
+			QFileInfo fileinfo(fullPath);
+			if(fileinfo.exists())
+			{
+				return fileinfo.absoluteFilePath();
+			}
+		}
 		return out.absoluteFilePath();
 	};
 	if(m_mojangDownloads)
@@ -69,7 +85,8 @@ void Library::getApplicableFiles(OpSys system, QStringList& jar, QStringList& na
 	}
 }
 
-QList<NetActionPtr> Library::getDownloads(OpSys system, HttpMetaCache * cache, QStringList &failedFiles) const
+QList< std::shared_ptr< NetAction > > Library::getDownloads(OpSys system, class HttpMetaCache* cache,
+															QStringList& failedFiles, const QString & overridePath) const
 {
 	QList<NetActionPtr> out;
 	bool isAlwaysStale = (hint() == "always-stale");
@@ -87,6 +104,25 @@ QList<NetActionPtr> Library::getDownloads(OpSys system, HttpMetaCache * cache, Q
 			return true;
 		if(isLocal)
 		{
+			if(!overridePath.isEmpty())
+			{
+				QString fileName;
+				int position = storage.lastIndexOf('/');
+				if(position == -1)
+				{
+					fileName = storage;
+				}
+				else
+				{
+					fileName = storage.mid(position);
+				}
+				auto fullPath = FS::PathCombine(overridePath, fileName);
+				QFileInfo fileinfo(fullPath);
+				if(fileinfo.exists())
+				{
+					return true;
+				}
+			}
 			QFileInfo fileinfo(entry->getFullPath());
 			if(!fileinfo.exists())
 			{
diff --git a/api/logic/minecraft/Library.h b/api/logic/minecraft/Library.h
index fdce93f3..6369c537 100644
--- a/api/logic/minecraft/Library.h
+++ b/api/logic/minecraft/Library.h
@@ -18,6 +18,7 @@
 #include "multimc_logic_export.h"
 
 class Library;
+class MinecraftInstance;
 
 typedef std::shared_ptr<Library> LibraryPtr;
 
@@ -99,7 +100,8 @@ public: /* methods */
 		m_repositoryURL = base_url;
 	}
 
-	void getApplicableFiles(OpSys system, QStringList & jar, QStringList & native, QStringList & native32, QStringList & native64) const;
+	void getApplicableFiles(OpSys system, QStringList & jar, QStringList & native,
+							QStringList & native32, QStringList & native64, const QString & overridePath) const;
 
 	void setAbsoluteUrl(const QString &absolute_url)
 	{
@@ -126,7 +128,8 @@ public: /* methods */
 	bool isActive() const;
 
 	// Get a list of downloads for this library
-	QList<NetActionPtr> getDownloads(OpSys system, class HttpMetaCache * cache, QStringList &failedFiles) const;
+	QList<NetActionPtr> getDownloads(OpSys system, class HttpMetaCache * cache,
+									 QStringList & failedFiles, const QString & overridePath) const;
 
 private: /* methods */
 	/// the default storage prefix used by MultiMC
diff --git a/api/logic/minecraft/Library_test.cpp b/api/logic/minecraft/Library_test.cpp
index fcf0b4d1..fe61d305 100644
--- a/api/logic/minecraft/Library_test.cpp
+++ b/api/logic/minecraft/Library_test.cpp
@@ -31,6 +31,7 @@ slots:
 	{
 		cache.reset(new HttpMetaCache());
 		cache->addBase("libraries", QDir("libraries").absolutePath());
+		dataDir = QDir("data").absolutePath();
 	}
 	void test_legacy()
 	{
@@ -39,7 +40,7 @@ slots:
 		QCOMPARE(test.isNative(), false);
 
 		QStringList jar, native, native32, native64;
-		test.getApplicableFiles(currentSystem, jar, native, native32, native64);
+		test.getApplicableFiles(currentSystem, jar, native, native32, native64, QString());
 		QCOMPARE(jar, getStorage("test/package/testname/testversion/testname-testversion.jar"));
 		QCOMPARE(native, {});
 		QCOMPARE(native32, {});
@@ -50,7 +51,7 @@ slots:
 		QStringList failedFiles;
 		Library test("test.package:testname:testversion");
 		test.setRepositoryURL("file://foo/bar");
-		auto downloads = test.getDownloads(currentSystem, cache.get(), failedFiles);
+		auto downloads = test.getDownloads(currentSystem, cache.get(), failedFiles, QString());
 		QCOMPARE(downloads.size(), 1);
 		QCOMPARE(failedFiles, {});
 		NetActionPtr dl = downloads[0];
@@ -62,10 +63,27 @@ slots:
 		QCOMPARE(test.isNative(), false);
 		QStringList failedFiles;
 		test.setHint("local");
-		auto downloads = test.getDownloads(currentSystem, cache.get(), failedFiles);
+		auto downloads = test.getDownloads(currentSystem, cache.get(), failedFiles, QString());
 		QCOMPARE(downloads.size(), 0);
 		QCOMPARE(failedFiles, getStorage("test/package/testname/testversion/testname-testversion.jar"));
 	}
+	void test_legacy_url_local_override()
+	{
+		Library test("com.paulscode:codecwav:20101023");
+		QCOMPARE(test.isNative(), false);
+		QStringList failedFiles;
+		test.setHint("local");
+		auto downloads = test.getDownloads(currentSystem, cache.get(), failedFiles, QString("data"));
+		QCOMPARE(downloads.size(), 0);
+		QCOMPARE(failedFiles.size(), 0);
+
+		QStringList jar, native, native32, native64;
+		test.getApplicableFiles(currentSystem, jar, native, native32, native64, QString("data"));
+		QCOMPARE(jar, {QFileInfo("data/codecwav-20101023.jar").absoluteFilePath()});
+		QCOMPARE(native, {});
+		QCOMPARE(native32, {});
+		QCOMPARE(native64, {});
+	}
 	void test_legacy_native()
 	{
 		Library test("test.package:testname:testversion");
@@ -74,13 +92,13 @@ slots:
 		test.setRepositoryURL("file://foo/bar");
 		{
 			QStringList jar, native, native32, native64;
-			test.getApplicableFiles(Os_Linux, jar, native, native32, native64);
+			test.getApplicableFiles(Os_Linux, jar, native, native32, native64, QString());
 			QCOMPARE(jar, {});
 			QCOMPARE(native, getStorage("test/package/testname/testversion/testname-testversion-linux.jar"));
 			QCOMPARE(native32, {});
 			QCOMPARE(native64, {});
 			QStringList failedFiles;
-			auto dls = test.getDownloads(Os_Linux, cache.get(), failedFiles);
+			auto dls = test.getDownloads(Os_Linux, cache.get(), failedFiles, QString());
 			QCOMPARE(dls.size(), 1);
 			QCOMPARE(failedFiles, {});
 			auto dl = dls[0];
@@ -97,13 +115,13 @@ slots:
 		test.setRepositoryURL("file://foo/bar");
 		{
 			QStringList jar, native, native32, native64;
-			test.getApplicableFiles(Os_Linux, jar, native, native32, native64);
+			test.getApplicableFiles(Os_Linux, jar, native, native32, native64, QString());
 			QCOMPARE(jar, {});
 			QCOMPARE(native, {});
 			QCOMPARE(native32, getStorage("test/package/testname/testversion/testname-testversion-linux-32.jar"));
 			QCOMPARE(native64, getStorage("test/package/testname/testversion/testname-testversion-linux-64.jar"));
 			QStringList failedFiles;
-			auto dls = test.getDownloads(Os_Linux, cache.get(), failedFiles);
+			auto dls = test.getDownloads(Os_Linux, cache.get(), failedFiles, QString());
 			QCOMPARE(dls.size(), 2);
 			QCOMPARE(failedFiles, {});
 			QCOMPARE(dls[0]->m_url, QUrl("file://foo/bar/test/package/testname/testversion/testname-testversion-linux-32.jar"));
@@ -111,13 +129,13 @@ slots:
 		}
 		{
 			QStringList jar, native, native32, native64;
-			test.getApplicableFiles(Os_Windows, jar, native, native32, native64);
+			test.getApplicableFiles(Os_Windows, jar, native, native32, native64, QString());
 			QCOMPARE(jar, {});
 			QCOMPARE(native, {});
 			QCOMPARE(native32, getStorage("test/package/testname/testversion/testname-testversion-windows-32.jar"));
 			QCOMPARE(native64, getStorage("test/package/testname/testversion/testname-testversion-windows-64.jar"));
 			QStringList failedFiles;
-			auto dls = test.getDownloads(Os_Windows, cache.get(), failedFiles);
+			auto dls = test.getDownloads(Os_Windows, cache.get(), failedFiles, QString());
 			QCOMPARE(dls.size(), 2);
 			QCOMPARE(failedFiles, {});
 			QCOMPARE(dls[0]->m_url, QUrl("file://foo/bar/test/package/testname/testversion/testname-testversion-windows-32.jar"));
@@ -125,45 +143,103 @@ slots:
 		}
 		{
 			QStringList jar, native, native32, native64;
-			test.getApplicableFiles(Os_OSX, jar, native, native32, native64);
+			test.getApplicableFiles(Os_OSX, jar, native, native32, native64, QString());
 			QCOMPARE(jar, {});
 			QCOMPARE(native, {});
 			QCOMPARE(native32, getStorage("test/package/testname/testversion/testname-testversion-osx-32.jar"));
 			QCOMPARE(native64, getStorage("test/package/testname/testversion/testname-testversion-osx-64.jar"));
 			QStringList failedFiles;
-			auto dls = test.getDownloads(Os_OSX, cache.get(), failedFiles);
+			auto dls = test.getDownloads(Os_OSX, cache.get(), failedFiles, QString());
 			QCOMPARE(dls.size(), 2);
 			QCOMPARE(failedFiles, {});
 			QCOMPARE(dls[0]->m_url, QUrl("file://foo/bar/test/package/testname/testversion/testname-testversion-osx-32.jar"));
 			QCOMPARE(dls[1]->m_url, QUrl("file://foo/bar/test/package/testname/testversion/testname-testversion-osx-64.jar"));
 		}
 	}
+	void test_legacy_native_arch_local_override()
+	{
+		Library test("test.package:testname:testversion");
+		test.m_nativeClassifiers[OpSys::Os_Linux]="linux-${arch}";
+		test.setHint("local");
+		QCOMPARE(test.isNative(), true);
+		test.setRepositoryURL("file://foo/bar");
+		{
+			QStringList jar, native, native32, native64;
+			test.getApplicableFiles(Os_Linux, jar, native, native32, native64, QString("data"));
+			QCOMPARE(jar, {});
+			QCOMPARE(native, {});
+			QCOMPARE(native32, {QFileInfo("data/testname-testversion-linux-32.jar").absoluteFilePath()});
+			QCOMPARE(native64, getStorage("test/package/testname/testversion/testname-testversion-linux-64.jar"));
+			QStringList failedFiles;
+			auto dls = test.getDownloads(Os_Linux, cache.get(), failedFiles, QString("data"));
+			QCOMPARE(dls.size(), 0);
+			QCOMPARE(failedFiles, {getStorage("test/package/testname/testversion/testname-testversion-linux-64.jar")});
+		}
+	}
 	void test_onenine()
 	{
 		auto test = readMojangJson("data/lib-simple.json");
-		QStringList jar, native, native32, native64;
-		test->getApplicableFiles(Os_OSX, jar, native, native32, native64);
-		QCOMPARE(jar, getStorage("com/paulscode/codecwav/20101023/codecwav-20101023.jar"));
-		QCOMPARE(native, {});
-		QCOMPARE(native32, {});
-		QCOMPARE(native64, {});
-		QStringList failedFiles;
-		auto dls = test->getDownloads(Os_Linux, cache.get(), failedFiles);
-		QCOMPARE(dls.size(), 1);
-		QCOMPARE(failedFiles, {});
-		QCOMPARE(dls[0]->m_url, QUrl("https://libraries.minecraft.net/com/paulscode/codecwav/20101023/codecwav-20101023.jar"));
+		{
+			QStringList jar, native, native32, native64;
+			test->getApplicableFiles(Os_OSX, jar, native, native32, native64, QString());
+			QCOMPARE(jar, getStorage("com/paulscode/codecwav/20101023/codecwav-20101023.jar"));
+			QCOMPARE(native, {});
+			QCOMPARE(native32, {});
+			QCOMPARE(native64, {});
+		}
+		{
+			QStringList failedFiles;
+			auto dls = test->getDownloads(Os_Linux, cache.get(), failedFiles, QString());
+			QCOMPARE(dls.size(), 1);
+			QCOMPARE(failedFiles, {});
+			QCOMPARE(dls[0]->m_url, QUrl("https://libraries.minecraft.net/com/paulscode/codecwav/20101023/codecwav-20101023.jar"));
+		}
+		test->setHint("local");
+		{
+			QStringList jar, native, native32, native64;
+			test->getApplicableFiles(Os_OSX, jar, native, native32, native64, QString("data"));
+			QCOMPARE(jar, {QFileInfo("data/codecwav-20101023.jar").absoluteFilePath()});
+			QCOMPARE(native, {});
+			QCOMPARE(native32, {});
+			QCOMPARE(native64, {});
+		}
+		{
+			QStringList failedFiles;
+			auto dls = test->getDownloads(Os_Linux, cache.get(), failedFiles, QString("data"));
+			QCOMPARE(dls.size(), 0);
+			QCOMPARE(failedFiles, {});
+		}
+	}
+	void test_onenine_local_override()
+	{
+		auto test = readMojangJson("data/lib-simple.json");
+		test->setHint("local");
+		{
+			QStringList jar, native, native32, native64;
+			test->getApplicableFiles(Os_OSX, jar, native, native32, native64, QString("data"));
+			QCOMPARE(jar, {QFileInfo("data/codecwav-20101023.jar").absoluteFilePath()});
+			QCOMPARE(native, {});
+			QCOMPARE(native32, {});
+			QCOMPARE(native64, {});
+		}
+		{
+			QStringList failedFiles;
+			auto dls = test->getDownloads(Os_Linux, cache.get(), failedFiles, QString("data"));
+			QCOMPARE(dls.size(), 0);
+			QCOMPARE(failedFiles, {});
+		}
 	}
 	void test_onenine_native()
 	{
 		auto test = readMojangJson("data/lib-native.json");
 		QStringList jar, native, native32, native64;
-		test->getApplicableFiles(Os_OSX, jar, native, native32, native64);
+		test->getApplicableFiles(Os_OSX, jar, native, native32, native64, QString());
 		QCOMPARE(jar, getStorage("org/lwjgl/lwjgl/lwjgl-platform/2.9.4-nightly-20150209/lwjgl-platform-2.9.4-nightly-20150209.jar"));
 		QCOMPARE(native, getStorage("org/lwjgl/lwjgl/lwjgl-platform/2.9.4-nightly-20150209/lwjgl-platform-2.9.4-nightly-20150209-natives-osx.jar"));
 		QCOMPARE(native32, {});
 		QCOMPARE(native64, {});
 		QStringList failedFiles;
-		auto dls = test->getDownloads(Os_OSX, cache.get(), failedFiles);
+		auto dls = test->getDownloads(Os_OSX, cache.get(), failedFiles, QString());
 		QCOMPARE(dls.size(), 2);
 		QCOMPARE(failedFiles, {});
 		QCOMPARE(dls[0]->m_url, QUrl("https://libraries.minecraft.net/org/lwjgl/lwjgl/lwjgl-platform/2.9.4-nightly-20150209/lwjgl-platform-2.9.4-nightly-20150209.jar"));
@@ -173,13 +249,13 @@ slots:
 	{
 		auto test = readMojangJson("data/lib-native-arch.json");
 		QStringList jar, native, native32, native64;
-		test->getApplicableFiles(Os_Windows, jar, native, native32, native64);
+		test->getApplicableFiles(Os_Windows, jar, native, native32, native64, QString());
 		QCOMPARE(jar, {});
 		QCOMPARE(native, {});
 		QCOMPARE(native32, getStorage("tv/twitch/twitch-platform/5.16/twitch-platform-5.16-natives-windows-32.jar"));
 		QCOMPARE(native64, getStorage("tv/twitch/twitch-platform/5.16/twitch-platform-5.16-natives-windows-64.jar"));
 		QStringList failedFiles;
-		auto dls = test->getDownloads(Os_Windows, cache.get(), failedFiles);
+		auto dls = test->getDownloads(Os_Windows, cache.get(), failedFiles, QString());
 		QCOMPARE(dls.size(), 2);
 		QCOMPARE(failedFiles, {});
 		QCOMPARE(dls[0]->m_url, QUrl("https://libraries.minecraft.net/tv/twitch/twitch-platform/5.16/twitch-platform-5.16-natives-windows-32.jar"));
@@ -187,7 +263,7 @@ slots:
 	}
 private:
 	std::unique_ptr<HttpMetaCache> cache;
-	QString workDir;
+	QString dataDir;
 };
 
 QTEST_GUILESS_MAIN(LibraryTest)
diff --git a/api/logic/minecraft/MinecraftInstance.h b/api/logic/minecraft/MinecraftInstance.h
index 3aef2969..8bae17d5 100644
--- a/api/logic/minecraft/MinecraftInstance.h
+++ b/api/logic/minecraft/MinecraftInstance.h
@@ -69,6 +69,8 @@ public:
 
 	virtual QString getNativePath() const = 0;
 
+	virtual QString getLocalLibraryPath() const = 0;
+
 	virtual QStringList processMinecraftArgs(AuthSessionPtr account) const = 0;
 
 	virtual JavaVersion getJavaVersion() const;
diff --git a/api/logic/minecraft/MinecraftProfile.cpp b/api/logic/minecraft/MinecraftProfile.cpp
index fbd67875..f6ae7360 100644
--- a/api/logic/minecraft/MinecraftProfile.cpp
+++ b/api/logic/minecraft/MinecraftProfile.cpp
@@ -581,14 +581,14 @@ const QList<LibraryPtr> & MinecraftProfile::getLibraries() const
 	return m_libraries;
 }
 
-void MinecraftProfile::getLibraryFiles(const QString& architecture, QStringList& jars, QStringList& nativeJars) const
+void MinecraftProfile::getLibraryFiles(const QString& architecture, QStringList& jars, QStringList& nativeJars, const QString& overridePath) const
 {
 	QStringList native32, native64;
 	jars.clear();
 	nativeJars.clear();
 	for (auto lib : getLibraries())
 	{
-		lib->getApplicableFiles(currentSystem, jars, nativeJars, native32, native64);
+		lib->getApplicableFiles(currentSystem, jars, nativeJars, native32, native64, overridePath);
 	}
 	if(architecture == "32")
 	{
diff --git a/api/logic/minecraft/MinecraftProfile.h b/api/logic/minecraft/MinecraftProfile.h
index 22dca979..9f5536fb 100644
--- a/api/logic/minecraft/MinecraftProfile.h
+++ b/api/logic/minecraft/MinecraftProfile.h
@@ -111,7 +111,7 @@ public: /* getters for profile variables */
 	const QStringList & getTweakers() const;
 	const QList<JarmodPtr> & getJarMods() const;
 	const QList<LibraryPtr> & getLibraries() const;
-	void getLibraryFiles(const QString & architecture, QStringList & jars, QStringList & nativeJars) const;
+	void getLibraryFiles(const QString & architecture, QStringList & jars, QStringList & nativeJars, const QString & overridePath) const;
 	QString getMainJarUrl() const;
 	bool hasTrait(const QString & trait) const;
 	ProblemSeverity getProblemSeverity() const;
diff --git a/api/logic/minecraft/legacy/LegacyInstance.h b/api/logic/minecraft/legacy/LegacyInstance.h
index 1d95340b..3db35fc9 100644
--- a/api/logic/minecraft/legacy/LegacyInstance.h
+++ b/api/logic/minecraft/legacy/LegacyInstance.h
@@ -132,6 +132,11 @@ public:
 	QStringList getNativeJars() const override;
 	QString getNativePath() const override;
 
+	QString getLocalLibraryPath() const override
+	{
+		return QString();
+	}
+
 	QStringList processMinecraftArgs(AuthSessionPtr account) const override;
 	QStringList verboseDescription(AuthSessionPtr session) override;
 
diff --git a/api/logic/minecraft/onesix/OneSixInstance.cpp b/api/logic/minecraft/onesix/OneSixInstance.cpp
index 1bf75bdb..d89a7612 100644
--- a/api/logic/minecraft/onesix/OneSixInstance.cpp
+++ b/api/logic/minecraft/onesix/OneSixInstance.cpp
@@ -145,6 +145,12 @@ QString OneSixInstance::getNativePath() const
 	return natives_dir.absolutePath();
 }
 
+QString OneSixInstance::getLocalLibraryPath() const
+{
+	QDir libraries_dir(FS::PathCombine(instanceRoot(), "libraries/"));
+	return libraries_dir.absolutePath();
+}
+
 QString OneSixInstance::mainJarPath() const
 {
 	auto jarMods = getJarMods();
@@ -207,7 +213,7 @@ QString OneSixInstance::createLaunchScript(AuthSessionPtr session)
 	{
 		QStringList jars, nativeJars;
 		auto javaArchitecture = settings()->get("JavaArchitecture").toString();
-		m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars);
+		m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars, getLocalLibraryPath());
 		for(auto file: jars)
 		{
 			launchScript += "cp " + file + "\n";
@@ -251,7 +257,7 @@ QStringList OneSixInstance::verboseDescription(AuthSessionPtr session)
 		out << "Libraries:";
 		QStringList jars, nativeJars;
 		auto javaArchitecture = settings()->get("JavaArchitecture").toString();
-		m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars);
+		m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars, getLocalLibraryPath());
 		auto printLibFile = [&](const QString & path)
 		{
 			QFileInfo info(path);
@@ -654,7 +660,7 @@ QStringList OneSixInstance::getClassPath() const
 {
 	QStringList jars, nativeJars;
 	auto javaArchitecture = settings()->get("JavaArchitecture").toString();
-	m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars);
+	m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars, getLocalLibraryPath());
 	jars.append(mainJarPath());
 	return jars;
 }
@@ -668,6 +674,6 @@ QStringList OneSixInstance::getNativeJars() const
 {
 	QStringList jars, nativeJars;
 	auto javaArchitecture = settings()->get("JavaArchitecture").toString();
-	m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars);
+	m_profile->getLibraryFiles(javaArchitecture, jars, nativeJars, getLocalLibraryPath());
 	return nativeJars;
 }
diff --git a/api/logic/minecraft/onesix/OneSixInstance.h b/api/logic/minecraft/onesix/OneSixInstance.h
index c857075f..170921ae 100644
--- a/api/logic/minecraft/onesix/OneSixInstance.h
+++ b/api/logic/minecraft/onesix/OneSixInstance.h
@@ -104,6 +104,8 @@ public:
 	QStringList getNativeJars() const override;
 	QString getNativePath() const override;
 
+	QString getLocalLibraryPath() const override;
+
 	QStringList processMinecraftArgs(AuthSessionPtr account) const override;
 
 protected:
diff --git a/api/logic/minecraft/onesix/update/LibrariesTask.cpp b/api/logic/minecraft/onesix/update/LibrariesTask.cpp
index 123b14a3..1efbc64c 100644
--- a/api/logic/minecraft/onesix/update/LibrariesTask.cpp
+++ b/api/logic/minecraft/onesix/update/LibrariesTask.cpp
@@ -42,7 +42,7 @@ void LibrariesTask::executeTask()
 	QStringList failedFiles;
 	for (auto lib : libs)
 	{
-		auto dls = lib->getDownloads(currentSystem, metacache.get(), failedFiles);
+		auto dls = lib->getDownloads(currentSystem, metacache.get(), failedFiles, inst->getLocalLibraryPath());
 		for(auto dl : dls)
 		{
 			downloadJob->addNetAction(dl);
diff --git a/api/logic/minecraft/testdata/codecwav-20101023.jar b/api/logic/minecraft/testdata/codecwav-20101023.jar
new file mode 100644
index 00000000..f5236083
--- /dev/null
+++ b/api/logic/minecraft/testdata/codecwav-20101023.jar
@@ -0,0 +1 @@
+dummy test file.
diff --git a/api/logic/minecraft/testdata/testname-testversion-linux-32.jar b/api/logic/minecraft/testdata/testname-testversion-linux-32.jar
new file mode 100644
index 00000000..f5236083
--- /dev/null
+++ b/api/logic/minecraft/testdata/testname-testversion-linux-32.jar
@@ -0,0 +1 @@
+dummy test file.