fix(fmt): exclude generated and BOM components in CI PR formatting

Author: lqiu96

.kokoro/build.sh

@@ -231,9 +231,15 @@ case ${JOB_TYPE} in
                     dir=$(dirname "${dir}")
                 done
                 if [ -f "${dir}/pom.xml" ] && [ "${dir}" != "." ]; then
-                    # Exclude sample modules as they are not in the default reactor
-                    if [[ "${dir}" != *"samples"* ]]; then
-                        echo "Processed file: ${changed_file} -> resolved module: ${dir}"
+                    # Filter out samples, directories with no Java source code, and generated protobuf/gRPC code
+                    if [[ "${dir}" != *"samples"* ]] && \
+                       [[ "${dir}" != *"tutorials"* ]] && \
+                       [[ "$(basename "${dir}")" != "proto-google-"* ]] && \
+                       [[ "$(basename "${dir}")" != "grpc-google-"* ]] && \
+                       [[ "$(basename "${dir}")" != *"-bom" ]] && \
+                       [[ "$(basename "${dir}")" != "google-cloud-pom-parent" ]] && \
+                       [[ "$(basename "${dir}")" != "google-cloud-jar-parent" ]]; then
+                       
                         changed_modules+=("${dir}")
                     fi
                 fi
@@ -250,32 +256,8 @@ case ${JOB_TYPE} in
             echo "Formatting only changed modules: ${unique_modules}"
         fi
     else
-        echo "BASE_SHA or HEAD_SHA is empty. Skipping file difference check."
-
-        # Build a list of exclusions to skip formatting generated code.
-        exclusions=""
-        
-        # Find and exclude generated sub-modules and parent/aggregator POMs:
-        # - proto-google-*, grpc-google-* : Generated protobuf/gRPC code should not be formatted manually.
-        # - *-bom : Bill of Materials modules that contain no valid source code anyway.
-        # - java-* at depth 1 : Top-level aggregator parent POMs for each library module wrapper.
-        # - google-cloud-pom-parent, google-cloud-jar-parent, gapic-libraries-bom : Repo-level parent modules.
-        # The syntax for excluding in Maven requires a "!" prefix before the path in the `-pl` argument.
-        for dir in $(find . -maxdepth 1 -type d -name "java-*" | sort; \
-                      find . -maxdepth 2 -type d \( -name "proto-google-*" -o -name "grpc-google-*" -o -name "*-bom" -o -name "google-cloud-pom-parent" -o -name "google-cloud-jar-parent" \) | sort); do
-            # Strip leading ./
-            dir="${dir#./}"
-            if [ -n "${exclusions}" ]; then
-                exclusions="${exclusions},!${dir}"
-            else
-                exclusions="!${dir}"
-            fi
-        done
-
-        if [ -n "${exclusions}" ]; then
-            MODULE_FILTER="-pl ${exclusions}"
-            echo "Excluding generated modules from formatting"
-        fi
+        echo "BASE_SHA or HEAD_SHA is empty. Cannot continue linting."
+        exit 1
     fi
 
     mvn -B -ntp \