Encore Rolling Go Fork

This is Encore's rolling fork of Go with added automatic instrumentation.

This branch contains the raw patches, which allow us to re-apply them ontop of new Go releases.

This system produces reproducible builds of the patched Go runtime. This means you can clone this repository, run the commands listed below and reproduce an identical go binary that we ship with our tooling.

How to Use

1. Checkout this repository and then initial the Git submodule; git submodule init && git submodule update
2. Create a fresh patched version of the Go runtime, passing in the Go version you want; ./apply_patch.bash 1.17 (Note: instead of a Go version number, you can pass in master to build against the latest Go development commit)
3. Run our build script using; go run . --goos "darwin" --goarch "arm64" (replacing the OS and arch parameters to match your requirement)
4. Verify your go was build; ./dist/darwin_arm64/encore-go/bin/go version The output you see should look like this, looking for the encore-go string; go version encore-go1.17.6 encore-go1.17-4d15582aff Thu Jan 6 19:06:43 2022 +0000 darwin/arm64

Directory Structure

This branch is broken up into three main folders;

• overlay; this folder contains brand-new Encore specific files which should be copied into the src path of a fresh Go Release
• patches; this folder contains patch files to modify the existing Go source code
• go; a submodule checkout of https://go.googlesource.com/go which we apply the above two folders against

Creating Patches

If patches do not apply due conflicts, or you need to make other changes to the Go runtime, apply the patches to get a base build, fix any conflicts or make your changes. Then from within the go folder, for each file run this command to copy the exact patch.

git diff --cached src/runtime/runtime2.go | pbcopy

Then create a new or update an existing .diff file in the patches folder. Once you've updated all the patches, re-run the ./apply_patches.bash script again to check your changes work.