GH-1778: Fix placement of modded Minecraft.jar in OneSix instances.

7 files changed, 21 insertions, 11 deletions

diff --git a/api/logic/minecraft/MinecraftInstance.cpp b/api/logic/minecraft/MinecraftInstance.cpp
index bcbabb1f..7b1aef1e 100644
--- a/api/logic/minecraft/MinecraftInstance.cpp
+++ b/api/logic/minecraft/MinecraftInstance.cpp
@@ -97,6 +97,11 @@ QString MinecraftInstance::minecraftRoot() const
 		return mcDir.filePath();
 }
 
+QString MinecraftInstance::binRoot() const
+{
+	return FS::PathCombine(minecraftRoot(), "bin");
+}
+
 std::shared_ptr< BaseVersionList > MinecraftInstance::versionList() const
 {
 	return ENV.getVersionList("net.minecraft");
diff --git a/api/logic/minecraft/MinecraftInstance.h b/api/logic/minecraft/MinecraftInstance.h
index 8bae17d5..7f967ce0 100644
--- a/api/logic/minecraft/MinecraftInstance.h
+++ b/api/logic/minecraft/MinecraftInstance.h
@@ -19,6 +19,9 @@ public:
 	/// Path to the instance's minecraft directory.
 	QString minecraftRoot() const;
 
+	/// Path to the instance's minecraft/bin directory.
+	QString binRoot() const;
+
 	//////  Mod Lists  //////
 	virtual std::shared_ptr<ModList> resourcePackList() const
 	{
diff --git a/api/logic/minecraft/legacy/LegacyInstance.cpp b/api/logic/minecraft/legacy/LegacyInstance.cpp
index 85de559c..0987d56f 100644
--- a/api/logic/minecraft/legacy/LegacyInstance.cpp
+++ b/api/logic/minecraft/legacy/LegacyInstance.cpp
@@ -291,11 +291,6 @@ QString LegacyInstance::jarModsDir() const
 	return FS::PathCombine(instanceRoot(), "instMods");
 }
 
-QString LegacyInstance::binDir() const
-{
-	return FS::PathCombine(minecraftRoot(), "bin");
-}
-
 QString LegacyInstance::libDir() const
 {
 	return FS::PathCombine(minecraftRoot(), "lib");
@@ -327,7 +322,7 @@ QString LegacyInstance::texturePacksDir() const
 
 QString LegacyInstance::runnableJar() const
 {
-	return FS::PathCombine(binDir(), "minecraft.jar");
+	return FS::PathCombine(binRoot(), "minecraft.jar");
 }
 
 QString LegacyInstance::modListFile() const
@@ -399,7 +394,7 @@ QString LegacyInstance::defaultBaseJar() const
 
 QString LegacyInstance::defaultCustomBaseJar() const
 {
-	return FS::PathCombine(binDir(), "mcbackup.jar");
+	return FS::PathCombine(binRoot(), "mcbackup.jar");
 }
 
 QString LegacyInstance::lwjglFolder() const
diff --git a/api/logic/minecraft/legacy/LegacyInstance.h b/api/logic/minecraft/legacy/LegacyInstance.h
index 6dc11aec..15d1383f 100644
--- a/api/logic/minecraft/legacy/LegacyInstance.h
+++ b/api/logic/minecraft/legacy/LegacyInstance.h
@@ -57,7 +57,6 @@ public:
 	QString savesDir() const;
 	QString texturePacksDir() const;
 	QString jarModsDir() const;
-	QString binDir() const;
 	QString loaderModsDir() const;
 	QString coreModsDir() const;
 	QString resourceDir() const;
diff --git a/api/logic/minecraft/legacy/LegacyUpdate.cpp b/api/logic/minecraft/legacy/LegacyUpdate.cpp
index 4ba7f102..fbef47f5 100644
--- a/api/logic/minecraft/legacy/LegacyUpdate.cpp
+++ b/api/logic/minecraft/legacy/LegacyUpdate.cpp
@@ -356,7 +356,7 @@ void LegacyUpdate::jarStart()
 
 	setStatus(tr("Checking for jar updates..."));
 	// Make directories
-	QDir binDir(inst->binDir());
+	QDir binDir(inst->binRoot());
 	if (!binDir.exists() && !binDir.mkpath("."))
 	{
 		emitFailed("Failed to create bin folder.");
diff --git a/api/logic/minecraft/onesix/OneSixInstance.cpp b/api/logic/minecraft/onesix/OneSixInstance.cpp
index 1bc0eb77..b471ff3e 100644
--- a/api/logic/minecraft/onesix/OneSixInstance.cpp
+++ b/api/logic/minecraft/onesix/OneSixInstance.cpp
@@ -156,7 +156,7 @@ QString OneSixInstance::mainJarPath() const
 	auto jarMods = getJarMods();
 	if (!jarMods.isEmpty())
 	{
-		return QDir(instanceRoot()).absoluteFilePath("minecraft.jar");
+		return QDir(binRoot()).absoluteFilePath("minecraft.jar");
 	}
 	else
 	{
@@ -392,7 +392,11 @@ std::shared_ptr<Task> OneSixInstance::createJarModdingTask()
 			{
 				tempJar.remove();
 			}
-			auto finalJarPath = QDir(m_inst->instanceRoot()).absoluteFilePath("minecraft.jar");
+			if(!FS::ensureFolderPathExists(m_inst->binRoot()))
+			{
+				emitFailed(tr("Couldn't create the bin folder for Minecraft.jar"));
+			}
+			auto finalJarPath = QDir(m_inst->binRoot()).absoluteFilePath("minecraft.jar");
 			QFile finalJar(finalJarPath);
 			if(finalJar.exists())
 			{
diff --git a/changelog.md b/changelog.md
index c23cd271..946ed504 100644
--- a/changelog.md
+++ b/changelog.md
@@ -146,6 +146,10 @@
 
   This fixes launching of legacy (and legacy FTB) instances.
 
+- GH-1778: Jar modded Minecraft.jar location breaks mod assumptions
+
+  Some ancient mods require the modded `Minecraft.jar` to be in `.minecraft/bin`, inside the instance. Now it is placed there.
+
 ## Internals
 
 - Full support for the current Mojang downloads JSON format.