Merge branch 'master' into pre/1.13

* master:
  Duplicate UUID Resolve Option
  Add more information to Entity.toString
  change LAST_EDIT to PAPER_LAST_EDIT for edit commands
  Add more information to Entity.toString()
  Add Debug Entities option to debug dupe uuid issues
  Guard the Entity.SHARED_RANDOM from seed changes
  Create a symlink on not-windows to current minecraft decompile dir
This commit is contained in:
Aikar 2018-07-21 16:13:27 -04:00
commit 6b63a88df0
No known key found for this signature in database
GPG Key ID: 401ADFC9891FAAFE
10 changed files with 397 additions and 33 deletions

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@ -9,11 +9,24 @@ diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/
index e16579116..c0367df20 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -50,6 +50,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
@@ -50,6 +50,20 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
// CraftBukkit start
private static final int CURRENT_LEVEL = 2;
+ public static Random SHARED_RANDOM = new Random(); // Paper
+ // Paper start
+ public static Random SHARED_RANDOM = new Random() {
+ private boolean locked = false;
+ @Override
+ public synchronized void setSeed(long seed) {
+ if (locked) {
+ LogManager.getLogger().error("Ignoring setSeed on Entity.SHARED_RANDOM", new Throwable());
+ } else {
+ super.setSeed(seed);
+ locked = true;
+ }
+ }
+ };
+ // Paper end
static boolean isLevelAtLeast(NBTTagCompound tag, int level) {
return tag.hasKey("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;
}

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@ -42,7 +42,7 @@ index 4ac2d39c5..d6d3ffa6f 100644
}
protected void c(Entity entity) {
+ if (!entity.valid) return; // Paper - Already removed, dont fire twice - this looks like it can happen even without our changes
+ if (!this.entitiesByUUID.containsKey(entity.getUniqueID()) && !entity.valid) return; // Paper - Already removed, dont fire twice - this looks like it can happen even without our changes
super.c(entity);
this.entitiesById.d(entity.getId());
this.entitiesByUUID.remove(entity.getUniqueID());

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@ -1,22 +0,0 @@
From fac0d56990f254da4f1a4b51310eaf047c9cea13 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 19 Jul 2018 01:13:28 -0400
Subject: [PATCH] add uuid to Entity.toString()
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index ea42800ae..93c34a260 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -2493,7 +2493,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
}
public String toString() {
- return String.format(Locale.ROOT, "%s[\'%s\'/%d, l=\'%s\', x=%.2f, y=%.2f, z=%.2f]", new Object[] { this.getClass().getSimpleName(), this.getDisplayName().getText(), Integer.valueOf(this.id), this.world == null ? "~NULL~" : this.world.getWorldData().getName(), Double.valueOf(this.locX), Double.valueOf(this.locY), Double.valueOf(this.locZ)});
+ return String.format(Locale.ROOT, "%s[\'%s\'/%d, uuid=\'%s\', l=\'%s\', x=%.2f, y=%.2f, z=%.2f]", new Object[] { this.getClass().getSimpleName(), this.getDisplayName().getText(), Integer.valueOf(this.id), this.uniqueID.toString(), this.world == null ? "~NULL~" : this.world.getWorldData().getName(), Double.valueOf(this.locX), Double.valueOf(this.locY), Double.valueOf(this.locZ)}); // Paper - add uuid
}
public boolean isInvulnerable(DamageSource damagesource) {
--
2.18.0

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@ -0,0 +1,23 @@
From b0c9be521fc1613e6ab93cbc058b8fbf2de7068a Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 19 Jul 2018 01:13:28 -0400
Subject: [PATCH] add more information to Entity.toString()
UUID, ticks lived, valid, dead
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 80ecdb282..99dac412f 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -2361,7 +2361,7 @@ public abstract class Entity implements ICommandListener, KeyedObject { // Paper
}
public String toString() {
- return String.format("%s[\'%s\'/%d, l=\'%s\', x=%.2f, y=%.2f, z=%.2f]", new Object[] { this.getClass().getSimpleName(), this.getName(), Integer.valueOf(this.id), this.world == null ? "~NULL~" : this.world.getWorldData().getName(), Double.valueOf(this.locX), Double.valueOf(this.locY), Double.valueOf(this.locZ)});
+ return String.format("%s[\'%s\'/%d, uuid=\'%s\', l=\'%s\', x=%.2f, y=%.2f, z=%.2f, cx=%d, cd=%d, tl=%d, v=%b, d=%b]", new Object[] { this.getClass().getSimpleName(), this.getName(), Integer.valueOf(this.id), this.uniqueID.toString(), this.world == null ? "~NULL~" : this.world.getWorldData().getName(), Double.valueOf(this.locX), Double.valueOf(this.locY), Double.valueOf(this.locZ), getChunkX(), getChunkZ(), this.ticksLived, this.valid, this.dead}); // Paper - add more information
}
public boolean isInvulnerable(DamageSource damagesource) {
--
2.18.0

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@ -0,0 +1,95 @@
From b061a231214e88cde43e0c3880f779723828b2b4 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 21 Jul 2018 08:25:40 -0400
Subject: [PATCH] Add Debug Entities option to debug dupe uuid issues
Add -Ddebug.entities=true to your JVM flags to gain more information
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index f6b755863..108654d63 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -73,6 +73,7 @@ public abstract class Entity implements ICommandListener, KeyedObject { // Paper
}
return bukkitEntity;
}
+ Throwable addedToWorldStack; // Paper - entity debug
// CraftBukikt end
private static final Logger a = LogManager.getLogger();
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index b16324e1a..994d4bbb8 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -7,6 +7,7 @@ import com.google.common.util.concurrent.ListenableFuture;
import java.io.File;
import java.util.ArrayList;
import java.util.Collection;
+import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
@@ -53,6 +54,10 @@ public class WorldServer extends World implements IAsyncTaskHandler {
private final List<NextTickListEntry> W = Lists.newArrayList();
// CraftBukkit start
+ private static final boolean DEBUG_ENTITIES = Boolean.getBoolean("debug.entities"); // Paper
+ private static Throwable getAddToWorldStackTrace(Entity entity) {
+ return new Throwable(entity + " Added to world at " + new Date());
+ }
public final int dimension;
// Add env and gen to constructor
@@ -1160,6 +1165,7 @@ public class WorldServer extends World implements IAsyncTaskHandler {
private boolean j(Entity entity) {
if (entity.dead) {
WorldServer.a.warn("Tried to add entity {} but it was marked as removed already", EntityTypes.a(entity)); // CraftBukkit // Paper
+ if (DEBUG_ENTITIES) getAddToWorldStackTrace(entity).printStackTrace();
return false;
} else {
UUID uuid = entity.getUniqueID();
@@ -1171,8 +1177,14 @@ public class WorldServer extends World implements IAsyncTaskHandler {
this.f.remove(entity1);
} else {
if (!(entity instanceof EntityHuman)) {
- WorldServer.a.error("Keeping entity {} that already exists with UUID {} - " + entity1, EntityTypes.a(entity1), uuid.toString()); // CraftBukkit // Paper
+ WorldServer.a.error("Keeping entity {} that already exists with UUID {}", entity1, uuid.toString()); // CraftBukkit // Paper
WorldServer.a.error("Deleting duplicate entity {}", entity); // Paper
+ if (DEBUG_ENTITIES) {
+ if (entity1.addedToWorldStack != null) {
+ entity1.addedToWorldStack.printStackTrace();
+ }
+ getAddToWorldStackTrace(entity).printStackTrace();
+ }
return false;
}
@@ -1189,7 +1201,24 @@ public class WorldServer extends World implements IAsyncTaskHandler {
protected void b(Entity entity) {
super.b(entity);
this.entitiesById.a(entity.getId(), entity);
- this.entitiesByUUID.put(entity.getUniqueID(), entity);
+ // Paper start
+ if (DEBUG_ENTITIES) {
+ entity.addedToWorldStack = getAddToWorldStackTrace(entity);
+ }
+ Entity old = this.entitiesByUUID.put(entity.getUniqueID(), entity);
+ if (old != null && old.getId() != entity.getId() && old.valid) {
+ Logger logger = LogManager.getLogger();
+ logger.error("Overwrote an existing entity " + old + " with " + entity);
+ if (DEBUG_ENTITIES) {
+ if (old.addedToWorldStack != null) {
+ old.addedToWorldStack.printStackTrace();
+ } else {
+ logger.error("Oddly, the old entity was not added to the world in the normal way. Plugins?");
+ }
+ entity.addedToWorldStack.printStackTrace();
+ }
+ }
+ // Paper end
Entity[] aentity = entity.bb();
if (aentity != null) {
--
2.18.0

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@ -0,0 +1,37 @@
From 9ac674cfb6f5f71dd61a4952c4bc7d88e3cfa3e5 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 21 Jul 2018 14:23:31 -0400
Subject: [PATCH] Additional Paper Config options
Have to keep as sep patch for now until 1.13, otherwise we can't merge :/
diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index 62bce1806..5a17ce3d2 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -67,6 +67,10 @@ public class PaperConfig {
readConfig(PaperConfig.class, null);
}
+ protected static void logError(String s) {
+ Bukkit.getLogger().severe(s);
+ }
+
protected static void log(String s) {
if (verbose) {
Bukkit.getLogger().info(s);
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 50416f40a..14c8edeff 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -11,6 +11,7 @@ import org.bukkit.configuration.file.YamlConfiguration;
import org.spigotmc.SpigotWorldConfig;
import static com.destroystokyo.paper.PaperConfig.log;
+import static com.destroystokyo.paper.PaperConfig.logError;
public class PaperWorldConfig {
--
2.18.0

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@ -0,0 +1,209 @@
From 2a6d7b5cf9db036928914e854416039d7c8a14af Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 21 Jul 2018 14:27:34 -0400
Subject: [PATCH] Duplicate UUID Resolve Option
Due to a bug in https://github.com/PaperMC/Paper/commit/2e29af3df05ec0a383f48be549d1c03200756d24
which was added all the way back in March of 2016, it was unknown (potentially not at the time)
that an entity might actually change the seed of the random object.
At some point, EntitySquid did start setting the seed. Due to this shared random, this caused
every entity to use a Random object with a predictable seed.
This has caused entities to potentially generate with the same UUID....
Over the years, servers have had entities disappear, but no sign of trouble
because CraftBukkit removed the log lines indicating that something was wrong.
We have fixed the root issue causing duplicate UUID's, however we now have chunk
files full of entities that have the same UUID as another entity!
When these chunks load, the 2nd entity will not be added to the world correctly.
If that chunk loads in a different order in the future, then it will reverse and the
missing one is now the one added to the world and not the other. This results in very
inconsistent entity behavior.
This change allows you to recover any duplicate entity by generating a new UUID for it.
This also lets you delete them instead if you don't want to risk having new entities added to
the world that you previously did not see.
But for those who are ok with leaving this inconsistent behavior, you may use WARN or NOTHING options.
It is recommended you regenerate the entities, as these were legit entities, and deserve your love.
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 14c8edeff..e3f6557e1 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -541,4 +541,40 @@ public class PaperWorldConfig {
log("Bed Search Radius: " + bedSearchRadius);
}
}
+
+ public enum DuplicateUUIDMode {
+ REGEN, DELETE, NOTHING, WARN
+ }
+ public DuplicateUUIDMode duplicateUUIDMode = DuplicateUUIDMode.REGEN;
+ public void repairDuplicateUUID() {
+ String desiredMode = getString("duplicate-uuid-resolver", "regenerate").toLowerCase().trim();
+ switch (desiredMode.toLowerCase()) {
+ case "regen":
+ case "regenerate":
+ duplicateUUIDMode = DuplicateUUIDMode.REGEN;
+ log("Duplicate UUID Resolve: Regenerate New UUID");
+ break;
+ case "remove":
+ case "delete":
+ duplicateUUIDMode = DuplicateUUIDMode.DELETE;
+ log("Duplicate UUID Resolve: Delete Entity");
+ break;
+ case "silent":
+ case "nothing":
+ duplicateUUIDMode = DuplicateUUIDMode.NOTHING;
+ logError("Duplicate UUID Resolve: Do Nothing (no logs) - Warning, may lose indication of bad things happening");
+ logError("PaperMC Strongly discourages use of this setting! Triggering these messages means SOMETHING IS WRONG!");
+ break;
+ case "log":
+ case "warn":
+ duplicateUUIDMode = DuplicateUUIDMode.WARN;
+ log("Duplicate UUID Resolve: Warn (do nothing but log it happened, may be spammy)");
+ break;
+ default:
+ duplicateUUIDMode = DuplicateUUIDMode.WARN;
+ logError("Warning: Invalidate duplicate-uuid-resolver config " + desiredMode + " - must be one of: regen, delete, nothing, warn");
+ log("Duplicate UUID Resolve: Warn (do nothing but log it happened, may be spammy)");
+ break;
+ }
+ }
}
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 04adf4e3c..ea9559583 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -1,5 +1,10 @@
package net.minecraft.server;
+// Paper start
+import com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode;
+import java.util.HashMap;
+import java.util.UUID;
+// Paper end
import com.destroystokyo.paper.exception.ServerInternalException;
import com.google.common.base.Predicate;
import com.google.common.collect.Maps;
@@ -31,6 +36,7 @@ public class Chunk {
public final World world;
public final int[] heightMap;
public Long scheduledForUnload; // Paper - delay chunk unloads
+ private static final Logger logger = LogManager.getLogger(); // Paper
public final int locX;
public final int locZ;
private boolean m;
@@ -658,6 +664,7 @@ public class Chunk {
if (i != this.locX || j != this.locZ) {
Chunk.e.warn("Wrong location! ({}, {}) should be ({}, {}), {}", Integer.valueOf(i), Integer.valueOf(j), Integer.valueOf(this.locX), Integer.valueOf(this.locZ), entity);
entity.die();
+ return; // Paper
}
int k = MathHelper.floor(entity.locY / 16.0D);
@@ -851,6 +858,37 @@ public class Chunk {
for (int j = 0; j < i; ++j) {
List entityslice = aentityslice[j]; // Spigot
+ // Paper start
+ DuplicateUUIDMode mode = world.paperConfig.duplicateUUIDMode;
+ if (mode == DuplicateUUIDMode.DELETE || mode == DuplicateUUIDMode.REGEN) {
+ Map<UUID, Entity> thisChunk = new HashMap<>();
+ for (Iterator<Entity> iterator = ((List<Entity>) entityslice).iterator(); iterator.hasNext(); ) {
+ Entity entity = iterator.next();
+ Entity other = ((WorldServer) world).entitiesByUUID.get(entity.uniqueID);
+ if (other == null) {
+ other = thisChunk.get(entity.uniqueID);
+ }
+ if (other != null) {
+ switch (mode) {
+ case REGEN: {
+ entity.setUUID(UUID.randomUUID());
+ logger.error("Duplicate UUID found used by " + other);
+ logger.error("Regenerated a new UUID for " + entity);
+ break;
+ }
+ case DELETE: {
+ logger.error("Duplicate UUID found used by " + other);
+ logger.error("Deleting duplicate entity " + entity);
+ entity.die();
+ iterator.remove();
+ break;
+ }
+ }
+ }
+ thisChunk.put(entity.uniqueID, entity);
+ }
+ }
+ // Paper end
this.world.a((Collection) entityslice);
}
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 0d3af8cb7..7188d0c99 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -2614,6 +2614,7 @@ public abstract class Entity implements ICommandListener, KeyedObject { // Paper
});
}
+ public void setUUID(UUID uuid) { a(uuid); } // Paper - OBFHELPER
public void a(UUID uuid) {
this.uniqueID = uuid;
this.ar = this.uniqueID.toString();
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index 994d4bbb8..1244baf45 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -42,7 +42,7 @@ public class WorldServer extends World implements IAsyncTaskHandler {
private final PlayerChunkMap manager;
// private final Set<NextTickListEntry> nextTickListHash = Sets.newHashSet();
private final HashTreeSet<NextTickListEntry> nextTickList = new HashTreeSet<NextTickListEntry>(); // CraftBukkit - HashTreeSet
- private final Map<UUID, Entity> entitiesByUUID = Maps.newHashMap();
+ public final Map<UUID, Entity> entitiesByUUID = Maps.newHashMap(); // Paper
public boolean savingDisabled;
private boolean Q;
private int emptyTime;
@@ -1177,14 +1177,17 @@ public class WorldServer extends World implements IAsyncTaskHandler {
this.f.remove(entity1);
} else {
if (!(entity instanceof EntityHuman)) {
- WorldServer.a.error("Keeping entity {} that already exists with UUID {}", entity1, uuid.toString()); // CraftBukkit // Paper
- WorldServer.a.error("Deleting duplicate entity {}", entity); // Paper
- if (DEBUG_ENTITIES) {
- if (entity1.addedToWorldStack != null) {
- entity1.addedToWorldStack.printStackTrace();
+ if (entity.world.paperConfig.duplicateUUIDMode != com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode.NOTHING) {
+ WorldServer.a.error("Keeping entity {} that already exists with UUID {}", entity1, uuid.toString()); // CraftBukkit // Paper
+ WorldServer.a.error("Duplicate entity {} will not be added to the world. See paper.yml duplicate-uuid-resolver and set this to either regen, delete or nothing to get rid of this message", entity); // Paper
+ if (DEBUG_ENTITIES) {
+ if (entity1.addedToWorldStack != null) {
+ entity1.addedToWorldStack.printStackTrace();
+ }
+ getAddToWorldStackTrace(entity).printStackTrace();
}
- getAddToWorldStackTrace(entity).printStackTrace();
}
+
return false;
}
@@ -1206,7 +1209,7 @@ public class WorldServer extends World implements IAsyncTaskHandler {
entity.addedToWorldStack = getAddToWorldStackTrace(entity);
}
Entity old = this.entitiesByUUID.put(entity.getUniqueID(), entity);
- if (old != null && old.getId() != entity.getId() && old.valid) {
+ if (old != null && old.getId() != entity.getId() && old.valid && entity.world.paperConfig.duplicateUUIDMode != com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode.NOTHING) {
Logger logger = LogManager.getLogger();
logger.error("Overwrote an existing entity " + old + " with " + entity);
if (DEBUG_ENTITIES) {
--
2.18.0

8
paper
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@ -99,7 +99,7 @@ case "$1" in
"e" | "edit")
case "$2" in
"s" | "server")
export LAST_EDIT="$basedir/Paper-Server"
export PAPER_LAST_EDIT="$basedir/Paper-Server"
cd "$basedir/Paper-Server"
(
set -e
@ -110,7 +110,7 @@ case "$1" in
)
;;
"a" | "api")
export LAST_EDIT="$basedir/Paper-API"
export PAPER_LAST_EDIT="$basedir/Paper-API"
cd "$basedir/Paper-API"
(
set -e
@ -121,8 +121,8 @@ case "$1" in
)
;;
"c" | "continue")
cd "$LAST_EDIT"
unset LAST_EDIT
cd "$PAPER_LAST_EDIT"
unset PAPER_LAST_EDIT
(
set -e

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@ -1,14 +1,14 @@
From 570c45e9491173c215cae1bd4ff5ff9b9b8b1fa0 Mon Sep 17 00:00:00 2001
From 6c9aa29b50e035dc386794e866d64ec07c4c9c19 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Fri, 16 Dec 2016 22:10:35 -0600
Subject: [PATCH] Vanished players don't have rights
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index f71528b5f..b13830e87 100644
index d79844a98..6d1e61e23 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -68,7 +68,7 @@ public abstract class Entity implements ICommandListener, KeyedObject { // Paper
@@ -81,7 +81,7 @@ public abstract class Entity implements ICommandListener, KeyedObject { // Paper
private static double f = 1.0D;
private static int entityCount;
private int id;

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@ -6,9 +6,9 @@ PS1="$"
basedir="$(cd "$1" && pwd -P)"
workdir="$basedir/work"
minecraftversion=$(cat "$workdir/BuildData/info.json" | grep minecraftVersion | cut -d '"' -f 4)
windows="$([[ "$OSTYPE" == "cygwin" || "$OSTYPE" == "msys" ]] && echo "true" || echo "false")"
decompiledir="$workdir/Minecraft/$minecraftversion"
classdir="$decompiledir/classes"
echo "Extracting NMS classes..."
if [ ! -d "$classdir" ]; then
mkdir -p "$classdir"
@ -30,4 +30,13 @@ if [ ! -d "$decompiledir/net/minecraft/server" ]; then
exit 1
fi
fi
# set a symlink to current
currentlink="$workdir/Minecraft/current"
if ([ ! -e "$currentlink" ] || [ -L "$currentlink" ]) && [ "$windows" == "false" ]; then
echo "Pointing $currentlink to $minecraftversion"
rm -rf "$currentlink"
ln -sfn "$minecraftversion" "$currentlink"
fi
)