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Setup for patch remapping, along with documentation on how to do it
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Kyle Wood
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README.md
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README.md
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Paper 
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===========
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Remapping Fork Patches
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======================
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High performance Spigot fork that aims to fix gameplay and mechanics inconsistencies.
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This repo is based on Paper 1.16.5. It can be used to remap patches of Paper forks.
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This branch is specifically and only for fork remapping. This is not for Paper development or for general use. It
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requires special steps and special set up. Follow the instructions in this readme, don't ask for help if you haven't
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read this entire readme and followed all of these steps.
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**Support and Project Discussion:**
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- [IRC](https://webchat.esper.net/?channels=paper) or [Discord](https://discord.gg/papermc)
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Remapping patches requires knowledge of how to fix issues when patches don't or can't apply correctly. Patches not
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applying correctly is not an issue with this repo or paperweight. You must fix them and continue the process manually
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yourself. This is identical to any other upstream update.
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How To (Server Admins)
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------
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Paperclip is a jar file that you can download and run just like a normal jar file.
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Setup
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-----
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Download Paper from our [downloads page](https://papermc.io/downloads).
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Paper's unmapped 1.16.5 patches are in [`patches/server-unmapped/0001`](https://github.com/PaperMC/Paper/tree/mappings/mojang/base/patches/server-unmapped/0001).
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Place the patches you want to remap in `0002`. Paperweight will only remap patches placed in the last directory - for
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example if there are directories `0001`, `0002`, and `0003`, only the patches in `0003` will be remapped.
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Run the Paperclip jar directly from your server. Just like old times
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If you are remapping patches for a fork of a fork, place you other upstream patches in `0002`, and your patches in `0003`.
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* Documentation on using Paper: [paper.readthedocs.io](https://paper.readthedocs.io/)
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* For a sneak peak on upcoming features, [see here](https://github.com/PaperMC/Paper/projects)
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How To (Plugin Developers)
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------
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* See our API patches [here](Spigot-API-Patches)
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* See upcoming, pending, and recently added API [here](https://github.com/PaperMC/Paper/projects/6)
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* Paper API javadocs here: [papermc.io/javadocs](https://papermc.io/javadocs/)
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* Maven Repo (for paper-api):
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```xml
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<repository>
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<id>papermc</id>
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<url>https://papermc.io/repo/repository/maven-public/</url>
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</repository>
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```
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* Artifact Information:
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```xml
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<dependency>
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<groupId>com.destroystokyo.paper</groupId>
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<artifactId>paper-api</artifactId>
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<version>1.16.5-R0.1-SNAPSHOT</version>
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<scope>provided</scope>
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</dependency>
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```
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**Or alternatively, with Gradle:**
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* Repository:
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```groovy
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repositories {
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maven {
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url 'https://papermc.io/repo/repository/maven-public/'
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}
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}
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```
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* Artifact:
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```groovy
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dependencies {
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compileOnly 'com.destroystokyo.paper:paper-api:1.16.5-R0.1-SNAPSHOT'
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}
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```
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How To (Compiling Jar From Source)
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------
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To compile Paper, you need JDK 8, maven, and an internet connection.
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Clone this repo, run `./paper jar` from *bash*, get files.
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How To (Pull Request)
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------
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See [Contributing](CONTRIBUTING.md)
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Special Thanks To:
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Pre-remapping
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-------------
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The patch remap task has no registered inputs, to make working with it repeated easier. That means if you run the task
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by itself, it will fail.
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[YourKit](https://www.yourkit.com/), makers of the outstanding java profiler, support open source projects of all kinds with their full featured [Java](https://www.yourkit.com/java/profiler) and [.NET](https://www.yourkit.com/.net/profiler) application profilers. We thank them for granting Paper an OSS license so that we can make our software the best it can be.
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Before you start remapping patches, you must first set up the patch environment by running:
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```shell
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./gradlew applyPatches
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```
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You will only need to do this once to set up the environment before you start remapping.
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Remapping
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---------
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To start remapping patches, run the `remapPatches` task:
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```shell
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./gradlew remapPatches
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```
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This can take a very long time, hours even, as patch remapping is a very complex and CPU & disk intensive task. How long
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it takes depends entirely on how many patches there are to be remapped, and how powerful your computer is.
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That said, while you may need to walk away during the process, the remapping process does require some amount of
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hands-on work to get it to complete. If you leave for a while and come back to a patch failure, you'll need to fix the
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issue and restart paperweight to pick up from where it left off, explained below.
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### Fixing patch application issues
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It is pretty unlikely that patch remapping will succeed first try. Paper's patches have already been fixed to apply
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correctly on this branch, but either your patches or your upstream patches are likely to fail in one way or another due
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to minor differences in tooling, setup, etc. Again, it is your responsibility to handle patch application issues as they
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come up just like any other upstream update.
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While the process of fixing issues with patch application is the same, how to resume and complete the process is
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different, as it hopefully goes without saying that patch remapping is a more complex process which requires extra work
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vs just a simple patch update.
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### Patch remap working directory setup
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There are a variety of files and directories that paperweight uses during patch remap, but only one directory that you
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need to worry about. This is the directory where patches are applied, and code is remapped.
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```
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<project_root>/.gradle/caches/paperweight/patch-remap-input
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```
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That directory contains what would be the `Paper-Server` directory during the patch remapping process.
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### Apply patch fixes
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If a patch fails to apply, go to the `patch-remap-input` directory to fix the issue, like you normally would. This repo
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contains the `apatch.sh` script in the `scripts` directory if you want to use it.
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Once you have fixed the issues in patch application, and are ready to continue, run `am --continue` in the
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`patch-remap-input` directory:
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```shell
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git am --continue
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```
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Each patch is applied in its own `am` session, so this won't cause any of the other patches to incidentally apply. After
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the `am` command in the above `patch-remap-input` directory is completed, continue the remapping process with:
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```shell
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./gradlew remapPatches --continue-remap
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```
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Due to the `--continue-remap` flag paperweight will pick up where it left off. If the patch that failed is in a
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pre-remap upstream patch set, it will simply continue applying the other patches. If the patch is in the remap patch
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set, paperweight will record the patch, remap it, and re-apply it on the remap branch as it normally would, then
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continue applying the rest of the patches from there.
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### Completed patch remap
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After the process is complete and all patches have been remapped, the new remapped patches (only including the remap
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patch set explained above) will be generated into `patches/server-remapped`.
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Help, something went wrong
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--------------------------
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If something goes wrong, it's almost certainly a patch application issue discussed above. We will not support or help
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you work through these kinds of issues. Dealing with patch breakages is part of the process of maintaining a fork, so if
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you don't already know what to do, don't expect us to teach you how to do it.
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If there is an error in paperweight that is causing some issue other than patch application, then we can look into
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figuring out what's wrong and fixing it. Please, *please*, read through everything here first and follow the
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instructions word for word. Do not try to simplify the process. Do not make up your own steps. If you do, again, we will
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absolutely not help you.
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@ -4,7 +4,7 @@ import io.papermc.paperweight.util.set
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plugins {
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java
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id("com.github.johnrengelman.shadow") version "7.0.0" apply false
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id("io.papermc.paperweight.core") version "1.1.8"
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id("io.papermc.paperweight.core") version "1.1.9-SNAPSHOT"
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}
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subprojects {
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@ -3,3 +3,5 @@ version = 1.16.5-R0.1-SNAPSHOT
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mcVersion = 1.16.5
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packageVersion = 1_16_R3
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org.gradle.jvmargs=-Xmx4G
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