infra: add check-msrv to Makefile

.github/workflows/ci.yml

@@ -155,19 +155,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - name: Setup Nightly Rust toolchain
-        uses: ./.github/actions/setup-builder
       - name: Install protoc
         uses: arduino/setup-protoc@v3
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-      - name: Generate minimal versions lockfile
-        run: |
-          cargo generate-lockfile -Z direct-minimal-versions
       - name: Setup MSRV Rust toolchain
         uses: ./.github/actions/setup-builder
         with:
           rust-version: ${{ env.rust_msrv }}
+      - name: Setup Nightly Rust toolchain
+        uses: ./.github/actions/setup-builder
       - name: Check MSRV
-        run: |
-          cargo +${{ env.rust_msrv }} check --locked --workspace
+        run: make check-msrv

Makefile

@@ -41,6 +41,15 @@ fix-toml: install-taplo-cli
 check-toml: install-taplo-cli
 	taplo check
 
+NIGHTLY_VERSION := $(shell awk -F'"' '/^channel/ {print $$2}' rust-toolchain.toml)
+MSRV_VERSION    := $(shell awk -F'"' '/^rust-version/ {print $$2}' Cargo.toml)
+
+check-msrv:
+	@set -e; \
+	trap 'git restore Cargo.lock' EXIT; \
+	cargo +$(NIGHTLY_VERSION) generate-lockfile -Z direct-minimal-versions; \
+	cargo +$(MSRV_VERSION) check --locked --workspace
+
 check: check-fmt check-clippy check-toml cargo-machete
 
 doc-test: