fuzz: Use build script from upstream

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

tests/fuzz/Dockerfile.builder

@@ -1,6 +1,9 @@
 FROM gcr.io/oss-fuzz-base/base-builder-go
 
-COPY ./ $GOPATH/src/github.com/fluxcd/helm-controller/
-COPY ./tests/fuzz/oss_fuzz_build.sh $SRC/build.sh
+ENV SRC=$GOPATH/src/github.com/fluxcd/helm-controller
+ENV FLUX_CI=true
+
+COPY ./ $SRC
+RUN wget https://raw.githubusercontent.com/google/oss-fuzz/master/projects/fluxcd/build.sh -O $SRC/build.sh
 
 WORKDIR $SRC

tests/fuzz/oss_fuzz_build.sh

@@ -1,81 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright 2022 The Flux authors
-#
-# 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.
-
-set -euxo pipefail
-
-# This file aims for:
-# - Dynamically discover and build all fuzz tests within the repository.
-# - Work for both local make fuzz-smoketest and the upstream oss-fuzz.
-
-GOPATH="${GOPATH:-/root/go}"
-GO_SRC="${GOPATH}/src"
-PROJECT_PATH="github.com/fluxcd/helm-controller"
-
-# install_deps installs all dependencies needed for upstream oss-fuzz.
-# Unfortunately we can't pin versions here, as we want to always
-# have the latest, so that we can reproduce errors occuring upstream.
-install_deps(){
-	if ! command -v go-118-fuzz-build &> /dev/null; then
-		go install github.com/AdamKorcz/go-118-fuzz-build@latest
-	fi
-}
-
-install_deps
-
-cd "${GO_SRC}/${PROJECT_PATH}"
-
-# Ensure any project-specific requirements are catered for ahead of
-# the generic build process.
-if [ -f "tests/fuzz/oss_fuzz_prebuild.sh" ]; then
-	tests/fuzz/oss_fuzz_prebuild.sh
-fi
-
-modules=$(find . -mindepth 1 -maxdepth 4 -type f -name 'go.mod' | cut -c 3- | sed 's|/[^/]*$$||' | sort -u | sed 's;/go.mod;;g' | sed 's;go.mod;.;g')
-
-for module in ${modules}; do
-
-	cd "${GO_SRC}/${PROJECT_PATH}/${module}"
-
-	# TODO: stop ignoring recorder_fuzzer_test.go. Temporary fix for fuzzing building issues.
-	test_files=$(grep -r --include='**_test.go' --files-with-matches 'func Fuzz' . || echo "")
-	if [ -z "${test_files}" ]; then
-		continue
-	fi
-
-	go get github.com/AdamKorcz/go-118-fuzz-build/testing
-
-	# Iterate through all Go Fuzz targets, compiling each into a fuzzer.
-	for file in ${test_files}; do
-		# If the subdir is a module, skip this file, as it will be handled
-		# at the next iteration of the outer loop. 
-		if [ -f "$(dirname "${file}")/go.mod" ]; then
-			continue
-		fi
-
-		targets=$(grep -oP 'func \K(Fuzz\w*)' "${file}")
-		for target_name in ${targets}; do
-			# Transform module path into module name (e.g. git/libgit2 to git_libgit2).
-			module_name=$(echo ${module} | tr / _)
-			# Compose fuzzer name based on the lowercase version of the func names.
-			# The module name is added after the fuzz prefix, for better discoverability.
-			fuzzer_name=$(echo "${target_name}" | tr '[:upper:]' '[:lower:]' | sed "s;fuzz_;fuzz_${module_name}_;g")
-			target_dir=$(dirname "${file}")
-
-			echo "Building ${file}.${target_name} into ${fuzzer_name}"
-			compile_native_go_fuzzer "${target_dir}" "${target_name}" "${fuzzer_name}"
-		done
-	done
-done

tests/fuzz/oss_fuzz_run.sh

@@ -17,4 +17,4 @@
 set -euxo pipefail
 
 # run each fuzzer once to ensure they are working properly
-find /out -type f -name "fuzz*" -exec echo {} -runs=1 \; | bash -e
+find /out -type f -iname "fuzz*" -exec echo {} -runs=1 \; | bash -e