papermc/Spigot-Server-Patches/0356-Fire-BlockPistonRetractEvent-for-all-empty-pistons.patch
Zach Brown 70ce6ce831
Move version command update checking to the implementation
This makes it easier for downstream projects (forks) to replace the
version fetching system with their own. It is as simple as implementing
an interface and overriding the default implementation of
org.bukkit.UnsafeValues#getVersionFetcher()

It also makes it easier for us to organize things like the version
history feature.

Lastly I have updated the paper implementation to check against the site
API rather than against jenkins.
2019-05-27 04:13:41 -05:00

50 lines
2.6 KiB
Diff

From 526e77b1d53264548589704961c8e62942ffc0f0 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach@zachbr.io>
Date: Thu, 31 Jan 2019 16:33:36 -0500
Subject: [PATCH] Fire BlockPistonRetractEvent for all empty pistons
There is an explicit check in the handling code for empty pistons that
prevents sticky pistons from firing the event. However when we look back
at the history we see that this check was originally added so that ONLY
sticky pistons would fire the retract event. I'm not sure why.
https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/1092acbddf07edfa4100bc6824504ac75088e913
Over the course of several updates, the meaning of that field appears to
have changed from "is NOT sticky" to "is sticky". So now its having the
opposite effect. Only normal pistons fire the retraction event. And like
all things in CB, it's just been carried around since.
If we are to believe the history, the correct fix for this issue is to
flip it so it only fires for sticky pistons, but that puts us in a
bind. It's already firing for non-sticky pistons, changing it now would
likely result in breakage. Furthermore, there is little documentation as
to WHY that was ever intended to be the case.
Instead we opt to remove the check entirely so that the event fires for
all piston types.
diff --git a/src/main/java/net/minecraft/server/BlockPiston.java b/src/main/java/net/minecraft/server/BlockPiston.java
index 141006e36..78603d2cb 100644
--- a/src/main/java/net/minecraft/server/BlockPiston.java
+++ b/src/main/java/net/minecraft/server/BlockPiston.java
@@ -121,7 +121,7 @@ public class BlockPiston extends BlockDirectional {
}
// CraftBukkit start
- if (!this.sticky) {
+ //if (!this.sticky) { // Paper - Prevents empty sticky pistons from firing retract - history behind is odd
org.bukkit.block.Block block = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
BlockPistonRetractEvent event = new BlockPistonRetractEvent(block, ImmutableList.<org.bukkit.block.Block>of(), CraftBlock.notchToBlockFace(enumdirection));
world.getServer().getPluginManager().callEvent(event);
@@ -129,7 +129,7 @@ public class BlockPiston extends BlockDirectional {
if (event.isCancelled()) {
return;
}
- }
+ //} // Paper
// PAIL: checkME - what happened to setTypeAndData?
// CraftBukkit end
world.playBlockAction(blockposition, this, b0, enumdirection.a());
--
2.21.0