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ci: only open a Rust toolchain PR when the version changed #485

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Merged
kp-thomas-yau merged 1 commit into from
Jul 23, 2026
Merged

ci: only open a Rust toolchain PR when the version changed #485

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18 changes: 15 additions & 3 deletions .github/workflows/nightly-rust-update-check.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,25 +24,37 @@ jobs:
run: |
rustup install stable
stable=$(rustup run stable rustc -V | sed -E -e 's/^rustc ([0-9\.]+) \(.*\)$/\1/g')
echo "Latest stable rust is ${stable}"
current=$(sed -E -n 's/^channel = "([0-9\.]+)"$/\1/p' rust-toolchain.toml)
echo "Latest stable rust is ${stable}, currently pinned to ${current}"

echo rust="$stable" >> "$GITHUB_OUTPUT"
if [ "$stable" != "$current" ]; then
echo changed=true >> "$GITHUB_OUTPUT"
else
echo changed=false >> "$GITHUB_OUTPUT"
fi

- name: Update Rust version in Earthfile
if: steps.check-version.outputs.changed == 'true'
run: sed -i -E 's/^(\s*FROM rust):(:?[0-9\.]+)(-.+)?$/\1:${{ steps.check-version.outputs.rust }}\3/g' Earthfile

- name: Update Rust version in rust-toolchain.toml
if: steps.check-version.outputs.changed == 'true'
run: sed -i -E 's/^(channel = ")[0-9\.]+(")$/\1${{ steps.check-version.outputs.rust }}\2/' rust-toolchain.toml

# nix (rust-overlay) can only resolve the pinned stable version once flake.lock points at a
# rust-overlay revision that carries it, so refresh that input in the same PR.
# rust-overlay revision that carries it, so refresh that input in the same PR. Gated on an
# actual version change so we don't bump the input (and open a spurious PR) on an unchanged night.
- name: Install Nix
if: steps.check-version.outputs.changed == 'true'
uses: DeterminateSystems/nix-installer-action@c5a866b6ab867e88becbed4467b93592bce69f8a # v21

- name: Update rust-overlay in flake.lock
if: steps.check-version.outputs.changed == 'true'
run: nix flake update rust-overlay

- uses: peter-evans/create-pull-request@c5a7806660adbe173f04e3e038b0ccdcd758773c # v6
- if: steps.check-version.outputs.changed == 'true'
uses: peter-evans/create-pull-request@c5a7806660adbe173f04e3e038b0ccdcd758773c # v6
with:
token: ${{ secrets.SERVICE_ACCOUNT_PAT }}
delete-branch: true
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