Automatically add the comment about executions when a new PR triggers (#1270)

Co-authored-by: toseven <Byone.heng@gmail.com>

.github/workflows/build_and_test.yml

@@ -230,6 +230,8 @@ jobs:
       matrix:
           os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
+    outputs:
+      output_new_executions: ${steps.}
     steps:
     - uses: actions-rs/toolchain@v1
       with:
@@ -247,9 +249,28 @@ jobs:
     - name: Build and run libfuzzer_libpng (Linux)
       if: runner.os == 'Linux'
       run: ./scripts/executions-check.sh 
-    - name: Build and run libfuzzer_libpng (macOS) 
+    - name: Build and run libfuzzer_libpng (macOS)  
       if: runner.os == 'macOS'
-      run: /usr/local/bin/bash -c './scripts/executions-check.sh'
+      run: /usr/local/bin/bash -c './scripts/executions-check.sh' 
+    - name: Post the execution count in a new PR (linux)
+      if: runner.os == 'Linux'
+      uses: wow-actions/auto-comment@v1
+      with:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        pullRequestOpened: |
+          On the Linux platform:
+            the execution count of the new fuzzer is ${{env.linux_new_executions}}
+            the execution count of the last fuzzer is ${{env.linux_last_executions}}
+    - name: Post the execution count in a new PR (macOS)
+      if: runner.os == 'macOS'
+      uses: wow-actions/auto-comment@v1
+      with:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        pullRequestOpened: |
+          On the MacOS platform:
+            the execution count of the new fuzzer is ${{env.macos_new_executions}}
+            the execution count of the last fuzzer is ${{env.macos_last_executions}}
+
 
   nostd-build:
     runs-on: ubuntu-latest

scripts/executions-check.sh

@@ -40,17 +40,24 @@ main(){
 	install_libpng
 
 	build_libpng
-	echo "start to run the new fuzzer"
+	#start to run the new fuzzer
 	new_executions=$(build_run_fuzzer)
 
 	git_checkout
 
 	build_libpng
-	echo "start to run the last fuzzer"
+	#start to run the last fuzzer
 	last_executions=$(build_run_fuzzer)	
 
-	echo "the execution count of the new fuzzer is $new_executions"
-	echo "the execution count of the last fuzzer is $last_executions"
+	prefix=""
+	if [ "$(uname)" == "Darwin" ]; then
+		prefix="macos"
+	else
+		prefix="linux"
+	fi
+
+	echo "${prefix}_new_executions=$new_executions" >> "$GITHUB_ENV"
+	echo "${prefix}_last_executions=$last_executions" >> "$GITHUB_ENV"
 }
 
 main