Add test project for the Bazel fuzzing rules. (#4936)

* Proof of concept for Bazel support in OSS Fuzz.

* Moved the Bazel rules project under a directory with a "-test" suffix, to better convey intent.

* Added copyright header.

* Update year in copyright note.

* Factor out the '_oss_fuzz' package suffix to bash var.

* Moving 'disabled' attribute at the end of the yaml file.

* Simplified Dockerfile due to base image update.

projects/bazel-rules-fuzzing-test/Dockerfile

@@ -0,0 +1,21 @@
+# Copyright 2021 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.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder
+
+RUN git clone https://github.com/bazelbuild/rules_fuzzing.git
+WORKDIR $SRC/rules_fuzzing/
+COPY build.sh $SRC/

projects/bazel-rules-fuzzing-test/build.sh

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+#!/bin/bash -eu
+#
+# Copyright 2021 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.
+#
+################################################################################
+
+declare -r QUERY='
+    let all_fuzz_tests = attr(tags, "fuzz-test", "//...") in
+    $all_fuzz_tests - attr(tags, "no-oss-fuzz", $all_fuzz_tests)
+'
+declare -r PACKAGE_SUFFIX="_oss_fuzz"
+declare -r OSS_FUZZ_TESTS="$(bazel query "${QUERY}" | sed "s/$/${PACKAGE_SUFFIX}/")"
+
+bazel build -c opt --config=oss-fuzz --linkopt=-lc++ ${OSS_FUZZ_TESTS[*]}
+for oss_fuzz_archive in $(find bazel-bin/ -name "*${PACKAGE_SUFFIX}.tar"); do
+    tar -xvf "${oss_fuzz_archive}" -C "${OUT}"
+done

projects/bazel-rules-fuzzing-test/project.yaml

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+homepage: "https://github.com/bazelbuild/rules_fuzzing"
+language: c++
+primary_contact: "test@example.com"
+
+fuzzing_engines:
+  - libfuzzer
+  - afl
+  - honggfuzz
+  - dataflow
+
+sanitizers:
+  - address
+  - undefined
+  - memory
+  - dataflow
+
+# This is a test project.
+disabled: true