Write down MSRV policy #161
Workflow file for this run
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| # This workflow checks if a PR commit has changed the size of a hello world Rust program. | |
| # It downloads Rustc and compiles two versions of a stage0 compiler - one using the base commit | |
| # of the PR, and one using the latest commit in the PR. | |
| # If the size of the hello world program has changed, it posts a comment to the PR. | |
| name: Check binary size | |
| on: | |
| pull_request_target: | |
| branches: | |
| - master | |
| jobs: | |
| test: | |
| name: Check binary size | |
| runs-on: ubuntu-latest | |
| permissions: | |
| pull-requests: write | |
| steps: | |
| - name: Print info | |
| run: | | |
| echo "Current SHA: ${{ github.event.pull_request.head.sha }}" | |
| echo "Base SHA: ${{ github.event.pull_request.base.sha }}" | |
| - name: Clone Rustc | |
| uses: actions/checkout@v3 | |
| with: | |
| repository: rust-lang/rust | |
| fetch-depth: 1 | |
| - name: Fetch backtrace | |
| run: git submodule update --init library/backtrace | |
| - name: Create hello world program that uses backtrace | |
| run: printf "fn main() { panic!(); }" > foo.rs | |
| - name: Build binary with base version of backtrace | |
| run: | | |
| printf "[llvm]\ndownload-ci-llvm = true\n\n[rust]\nincremental = false\n" > config.toml | |
| cd library/backtrace | |
| git remote add head-pr https://github.com/${{ github.event.pull_request.head.repo.full_name }} | |
| git fetch --all | |
| git checkout ${{ github.event.pull_request.base.sha }} | |
| cd ../.. | |
| git add library/backtrace | |
| python3 x.py build library --stage 0 | |
| ./build/x86_64-unknown-linux-gnu/stage0-sysroot/bin/rustc -O foo.rs -o binary-reference | |
| - name: Build binary with PR version of backtrace | |
| run: | | |
| cd library/backtrace | |
| git checkout ${{ github.event.pull_request.head.sha }} | |
| cd ../.. | |
| git add library/backtrace | |
| rm -rf build/x86_64-unknown-linux-gnu/stage0-std | |
| python3 x.py build library --stage 0 | |
| ./build/x86_64-unknown-linux-gnu/stage0-sysroot/bin/rustc -O foo.rs -o binary-updated | |
| - name: Display binary size | |
| run: | | |
| ls -la binary-* | |
| echo "SIZE_REFERENCE=$(stat -c '%s' binary-reference)" >> "$GITHUB_ENV" | |
| echo "SIZE_UPDATED=$(stat -c '%s' binary-updated)" >> "$GITHUB_ENV" | |
| - name: Post a PR comment if the size has changed | |
| uses: actions/github-script@v6 | |
| with: | |
| script: | | |
| const reference = process.env.SIZE_REFERENCE; | |
| const updated = process.env.SIZE_UPDATED; | |
| const diff = updated - reference; | |
| const plus = diff > 0 ? "+" : ""; | |
| const diff_str = `${plus}${diff}B`; | |
| if (diff !== 0) { | |
| const percent = (((updated / reference) - 1) * 100).toFixed(2); | |
| // The body is created here and wrapped so "weirdly" to avoid whitespace at the start of the lines, | |
| // which is interpreted as a code block by Markdown. | |
| const body = `Below is the size of a hello-world Rust program linked with libstd with backtrace. | |
| Original binary size: **${reference}B** | |
| Updated binary size: **${updated}B** | |
| Difference: **${diff_str}** (${percent}%)`; | |
| github.rest.issues.createComment({ | |
| issue_number: context.issue.number, | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| body | |
| }) | |
| } |