rust-gpu/.github/workflows/rust-toolchain-upgrade.yml

name: Rust Toolchain Upgrade

on:
  schedule:
    # Run every day at 2 AM UTC
    - cron: '0 2 * * *'
  workflow_dispatch: # Allow manual triggering

permissions:
  contents: write
  pull-requests: write

jobs:
  check-and-upgrade:
    runs-on: ubuntu-latest
    if: github.repository == 'Rust-GPU/rust-gpu'
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check for new nightly
        id: check-nightly
        run: .github/check-rust-toolchain-upgrade.sh

      - name: Update toolchain files
        if: steps.check-nightly.outputs.SHOULD_UPGRADE == 'true'
        run: |
          NEW_DATE="${{ steps.check-nightly.outputs.NEW_DATE }}"
          NEW_COMMIT_HASH="${{ steps.check-nightly.outputs.NEW_COMMIT_HASH }}"
          
          # Update rust-toolchain.toml
          sed -i "s/^channel = \"nightly-[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}\"/channel = \"nightly-${NEW_DATE}\"/" rust-toolchain.toml
          sed -i "s/^# commit_hash = [a-f0-9]\+/# commit_hash = ${NEW_COMMIT_HASH}/" rust-toolchain.toml
          
          # Update REQUIRED_RUST_TOOLCHAIN in build.rs
          sed -i "s/^channel = \"nightly-[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}\"/channel = \"nightly-${NEW_DATE}\"/" crates/rustc_codegen_spirv/build.rs
          sed -i "s/^# commit_hash = [a-f0-9]\+/# commit_hash = ${NEW_COMMIT_HASH}/" crates/rustc_codegen_spirv/build.rs

      - name: Build project
        if: steps.check-nightly.outputs.SHOULD_UPGRADE == 'true'
        run: |
          # The updated rust-toolchain.toml will cause cargo to download the required toolchain
          cargo build

      - name: Run tests
        if: steps.check-nightly.outputs.SHOULD_UPGRADE == 'true'
        run: |
          cargo compiletest

      - name: Create Pull Request
        if: steps.check-nightly.outputs.SHOULD_UPGRADE == 'true'
        uses: peter-evans/create-pull-request@v6
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: |
            Upgrade Rust toolchain to nightly-${{ steps.check-nightly.outputs.NEW_DATE }}
            
            Updates:
            - rust-toolchain.toml: nightly-${{ steps.check-nightly.outputs.NEW_DATE }}
            - commit hash: ${{ steps.check-nightly.outputs.NEW_COMMIT_HASH }}
            - REQUIRED_RUST_TOOLCHAIN in build.rs
          branch: rust-toolchain-upgrade
          delete-branch: true
          title: "Upgrade Rust toolchain to nightly-${{ steps.check-nightly.outputs.NEW_DATE }}"
          body: |
            This PR upgrades the Rust toolchain to the latest available nightly version.
            
            ## Changes
            - Updated `rust-toolchain.toml` to use `nightly-${{ steps.check-nightly.outputs.NEW_DATE }}`
            - Updated commit hash to `${{ steps.check-nightly.outputs.NEW_COMMIT_HASH }}`
            - Updated `REQUIRED_RUST_TOOLCHAIN` in `crates/rustc_codegen_spirv/build.rs`
            
            ## Verification
            - All required components are available
            - Project builds successfully
            - Tests pass
            
            This PR was automatically generated by the [Rust toolchain upgrade workflow](https://github.com/Rust-GPU/rust-gpu/blob/main/.github/workflows/rust-toolchain-upgrade.yml).