Protect important header files.

test=develop

paddle/fluid/framework/operator.h

@@ -71,7 +71,7 @@ class OperatorBase;
 class ExecutionContext;
 
 /**
- * OperatorBase has the basic element that Net will call to do computation.
+ * OperatorBase has the basic elements that Net will call to do computation.
  * Only CreateOperator from OpRegistry will new Operator directly. User
  * should always construct a proto message OpDesc and call
  * OpRegistry::CreateOp(op_desc) to get an Operator instance.

paddle/scripts/paddle_build.sh

@@ -469,18 +469,21 @@ function assert_api_spec_approvals() {
         BRANCH="develop"
     fi
 
-    API_CHANGE=`git diff --name-only upstream/$BRANCH | grep "paddle/fluid/API.spec" || true`
-    echo "checking API.spec change, PR: ${GIT_PR_ID}, changes: ${API_CHANGE}"
+    API_FILES=('paddle/fluid/API.spec' 'paddle/fluid/framework/operator.h')
+    for API_FILE in ${API_FILES}; do
+      API_CHANGE=`git diff --name-only upstream/$BRANCH | grep "${API_FILE}" || true`
+      echo "checking ${API_FILE} change, PR: ${GIT_PR_ID}, changes: ${API_CHANGE}"
       if [ ${API_CHANGE} ] && [ "${GIT_PR_ID}" != "" ]; then
           # NOTE: per_page=10000 should be ok for all cases, a PR review > 10000 is not human readable.
           APPROVALS=`curl -H "Authorization: token ${GITHUB_API_TOKEN}" https://api.github.com/repos/PaddlePaddle/Paddle/pulls/${GIT_PR_ID}/reviews?per_page=10000 | \
           python ${PADDLE_ROOT}/tools/check_pr_approval.py 2 7845005 2887803 728699 13348433`
           echo "current pr ${GIT_PR_ID} got approvals: ${APPROVALS}"
           if [ "${APPROVALS}" == "FALSE" ]; then
-            echo "You must have at least 2 approvals for the api change!"
+              echo "You must have at least 2 approvals for the api change! ${API_FILE}"
           exit 1
           fi
       fi
+    done
 }