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Auto merge of rust-lang#12181 - weihanglo:which-channel-backport, r=e…
…huss chore: detect the channel a PR wants to merge into ### What does this PR try to resolve? This detects which channel a pull request wants to merge into. It is hard because bors runs in a different repo. Bors knows nothing about branches or tag in this repo. It only see one base commit and a merge commit AFAIK. Basically the assumption and idea are 1. bors create a merge commit, so `HEAD~` should find the base branch. 2. Cargo maintains `rust-1.y.0` branch for each Rust minor version releases. Therefore, we can use the symbolic name of `origin/rust-1.x.0` to determine if it aims for stable, beta, or nightly channel. 3. After we know which channel it is targeted at, we can skip jobs that are likely to be broken.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| [ | ||
| { | ||
| "name": "Linux x86_64 stable", | ||
| "os": "ubuntu-latest", | ||
| "rust": "stable", | ||
| "other": "i686-unknown-linux-gnu" | ||
| }, | ||
| { | ||
| "name": "Linux x86_64 beta", | ||
| "os": "ubuntu-latest", | ||
| "rust": "beta", | ||
| "other": "i686-unknown-linux-gnu" | ||
| }, | ||
| { | ||
| "name": "Linux x86_64 nightly", | ||
| "os": "ubuntu-latest", | ||
| "rust": "nightly", | ||
| "other": "i686-unknown-linux-gnu" | ||
| }, | ||
| { | ||
| "name": "macOS x86_64 stable", | ||
| "os": "macos-latest", | ||
| "rust": "stable", | ||
| "other": "x86_64-apple-ios" | ||
| }, | ||
| { | ||
| "name": "macOS x86_64 nightly", | ||
| "os": "macos-latest", | ||
| "rust": "nightly", | ||
| "other": "x86_64-apple-ios" | ||
| }, | ||
| { | ||
| "name": "Windows x86_64 MSVC stable", | ||
| "os": "windows-latest", | ||
| "rust": "stable-msvc", | ||
| "other": "i686-pc-windows-msvc" | ||
| }, | ||
| { | ||
| "name": "Windows x86_64 gnu nightly", | ||
| "os": "windows-latest", | ||
| "rust": "nightly-gnu", | ||
| "other": "i686-pc-windows-gnu" | ||
| } | ||
| ] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| #!/bin/bash | ||
| # This script outputs the channel where a CI workflow wants to merge into. | ||
| # | ||
| # Inputs: | ||
| # BASE_SHA The commit SHA of the branch where the PR wants to merge into. | ||
| # | ||
| # GitHub Action Outputs: | ||
| # CHANNEL Target channel where the PR wants to merge into. | ||
|
|
||
| set -euo pipefail | ||
|
|
||
| # When `BASE_SHA` is missing, we assume it is from bors merge commit, | ||
| # so hope `HEAD~` to find the previous commit on master branch. | ||
| base_sha=$(git rev-parse "${BASE_SHA:-HEAD~1}") | ||
|
|
||
| # Get symbolic names for the base_sha. | ||
| # Assumption: Cargo branches are always in the format of `rust-1.*.0`, | ||
| # otherwise `git name-rev` will return "undefined". | ||
| ref=$(git name-rev --name-only --refs='origin/rust-1.*.0' $base_sha) | ||
|
|
||
| # Get the latest `rust-1.*.0` branch from remote origin. | ||
| # Assumption: The latest branch is always beta branch. | ||
| beta=$( | ||
| git branch --remotes --list 'origin/rust-1.*.0' \ | ||
| | sort --version-sort \ | ||
| | tail -n1 \ | ||
| | tr -d "[:space:]" | ||
| ) | ||
|
|
||
| master=$(git rev-parse origin/master) | ||
|
|
||
| # Backport pull requests always target at a `rust-1.*.0` branch. | ||
| if [[ "$ref" = "undefined" ]] || [[ "$base_sha" = "$master" ]] | ||
| then | ||
| # Should be nightly but for convenience in CI let's call it master. | ||
| channel="master" | ||
| elif [[ "$ref" = "$beta" ]] | ||
| then | ||
| channel="beta" | ||
| else | ||
| channel="stable" | ||
| fi | ||
|
|
||
| echo "Base sha: $base_sha" | ||
| echo "Git Ref: $ref" | ||
| echo "master: $master" | ||
| echo "beta: $beta" | ||
| echo "Channel: $channel" | ||
|
|
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| echo "CHANNEL=$channel" >> "$GITHUB_OUTPUT" |