mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 21:07:18 +00:00
62 lines
2.2 KiB
Markdown
62 lines
2.2 KiB
Markdown
|
# Third Party Package Patching
|
||
|
|
|
||
|
|
This directory includes local patches to third party dependencies we use in Prysm. Sometimes,
|
||
|
|
we need to make a small change to some dependency for ease of use in Prysm without wanting
|
||
|
|
to maintain our own fork of the dependency ourselves. Our build tool, [Bazel](https://bazel.build)
|
||
|
|
allows us to include patches in a seamless manner based on simple diff rules.
|
||
|
|
|
||
|
|
This README outlines how patching works in Prysm and an explanation of previously
|
||
|
|
created patches.
|
||
|
|
|
||
|
|
**Given maintaining a patch can be difficult and tedious,
|
||
|
|
patches are NOT the recommended way of modifying dependencies in Prysm
|
||
|
|
unless really needed**
|
||
|
|
|
||
|
|
## Table of Contents
|
||
|
|
|
||
|
|
- [Prerequisites](#prerequisites)
|
||
|
|
- [Creating a Patch](#creating-a-patch)
|
||
|
|
- [Ethereum APIs Patch](#ethereum-apis-patch)
|
||
|
|
- [Updating Patches](#updating-patches)
|
||
|
|
|
||
|
|
## Prerequisites
|
||
|
|
|
||
|
|
**Bazel Installation:**
|
||
|
|
- The latest release of [Bazel](https://docs.bazel.build/versions/master/install.html)
|
||
|
|
- A modern UNIX operating system (MacOS included)
|
||
|
|
|
||
|
|
## Creating a Patch
|
||
|
|
|
||
|
|
To create a patch, we need an original version of a dependency which we will refer to as `a`
|
||
|
|
and the patched version referred to as `b`.
|
||
|
|
|
||
|
|
```
|
||
|
|
cd /tmp
|
||
|
|
git clone https://github.com/someteam/somerepo a
|
||
|
|
git clone https://github.com/someteam/somerepo b && cd b
|
||
|
|
```
|
||
|
|
Then, make all your changes in `b` and finally create the diff of all your changes as follows:
|
||
|
|
```
|
||
|
|
cd ..
|
||
|
|
diff -ur --exclude=".git" a b > $GOPATH/src/github.com/prysmaticlabs/prysm/third_party/YOURPATCH.patch
|
||
|
|
```
|
||
|
|
|
||
|
|
Next, we need to tell the Bazel [WORKSPACE](https://github.com/prysmaticlabs/prysm/blob/master/WORKSPACE) to patch the specific dependency.
|
||
|
|
Here's an example for a patch we use today for the [Ethereum APIs](https://github.com/prysmaticlabs/ethereumapis)
|
||
|
|
dependency:
|
||
|
|
|
||
|
|
```
|
||
|
|
go_repository(
|
||
|
|
name = "com_github_prysmaticlabs_ethereumapis",
|
||
|
|
commit = "367ca574419a062ae26818f60bdeb5751a6f538",
|
||
|
|
patch_args = ["-p1"],
|
||
|
|
patches = [
|
||
|
|
"//third_party:com_github_prysmaticlabs_ethereumapis-tags.patch",
|
||
|
|
],
|
||
|
|
importpath = "github.com/prysmaticlabs/ethereumapis",
|
||
|
|
)
|
||
|
|
```
|
||
|
|
|
||
|
|
Now, when used in Prysm, the dependency you patched will have the patched modifications
|
||
|
|
when you run your code.
|