Add changelog test for Rust (#682)

.github/workflows/rust-test.yml

@@ -16,11 +16,19 @@ permissions:
   contents: read
 
 jobs:
+  changelog:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4
+        with:
+          fetch-depth: 0
+      - run: ./changelog.sh
+        working-directory: rust
   test:
-    runs-on: "ubuntu-latest"
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        toolchain: ["stable", "nightly"]
+        toolchain: [stable, nightly]
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4
       - run: rustup default ${{ matrix.toolchain }}

rust/changelog.sh

@@ -0,0 +1,45 @@
+#!/bin/sh
+# Copyright 2024 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+. ./color.sh
+
+fail() {
+  kind=$1
+  dir=$2
+  case $kind in
+    stale) message="Some changes have not been logged." ;;
+    format) message="This line should be an H2 version." ;;
+    diff) message="This version differs from the Cargo.toml file." ;;
+    *) error "Unsupported kind '$kind'" ;;
+  esac
+  if [ -z "$CI" ]
+  then error "$message"
+  else echo "::warning file=rust/$dir/CHANGELOG.md,line=3::$message"
+  fi
+}
+
+for dir in lib cli; do
+  ( cd $dir
+    info "Checking $dir"
+    ref=$(git log -n1 --pretty=format:%H origin/main.. -- CHANGELOG.md)
+    [ -n "$ref" ] || ref=origin/main
+    git diff --quiet $ref -- Cargo.toml src || fail stale $dir
+    cver="$(sed -n '3s/^## //p' CHANGELOG.md)"
+    [ -n "$cver" ] || fail format $dir
+    pver="$(sed -n '/^\[package]$/,/^$/{s/^version = "\(.*\)"$/\1/p}' Cargo.toml)"
+    [ "$pver" = "$cver" ] || fail diff $dir
+  )
+done