Pass FuzzIntrospector environment variables to bazel builds (#7367)

* Using bazelrc to pass env vars

* place bazelrc in /root/.bazelrc

* Setting spawn strategy to standalone

* undo changes in Dockerfile

infra/base-images/base-builder/Dockerfile

@@ -161,5 +161,6 @@ COPY cargo compile compile_afl compile_dataflow compile_libfuzzer compile_honggf
 
 COPY llvmsymbol.diff $SRC
 COPY detect_repo.py /opt/cifuzz/
+COPY bazel.bazelrc /root/.bazelrc
 
 CMD ["compile"]

infra/base-images/base-builder/bazel.bazelrc

@@ -0,0 +1,20 @@
+# Copyright 2022 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.
+#
+################################################################################
+
+
+# pass variables from environment
+build --action_env=FUZZ_INTROSPECTOR
+build --action_env=FUZZINTRO_OUTDIR

infra/base-images/base-builder/bazel_build_fuzz_tests

@@ -54,6 +54,8 @@ declare -r BAZEL_BUILD_FLAGS=(
     "--@rules_fuzzing//fuzzing:cc_engine_sanitizer=none" \
     "--cxxopt=-stdlib=libc++" \
     "--linkopt=-lc++" \
+    "--verbose_failures" \
+    "--spawn_strategy=standalone" \
     "--action_env=CC=${CC}" "--action_env=CXX=${CXX}" \
     ${BAZEL_EXTRA_BUILD_FLAGS[*]}
 )