fuzz: add oss-fuzz build script

fuzz/oss_fuzz_build.sh

@@ -0,0 +1,36 @@
+#!/bin/bash -eu
+# Copyright 2021 Google Inc.
+#
+# 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:https://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.
+#
+################################################################################
+
+FUZZERS_BASE=$SRC/hcl/hclsyntax/fuzz
+FUZZERS_PACKAGE=github.com/hashicorp/hcl/v2/hclsyntax/fuzz
+FUZZER_CLASS=Fuzz
+
+for THE_FUZZER in config expr template traversal
+do
+ THE_FUZZER_NAME="fuzz_"$THE_FUZZER
+ compile_go_fuzzer $FUZZERS_PACKAGE/$THE_FUZZER $FUZZER_CLASS $THE_FUZZER_NAME
+
+ OUTDIR=$OUT/$THE_FUZZER_NAME"_seed_corpus"
+ mkdir $OUTDIR
+ find $FUZZERS_BASE/$THE_FUZZER/corpus -type f | while read FNAME
+ do
+ SHASUM_NAME=$(shasum "$FNAME" | awk '{print $1}')
+ cp "$FNAME" $OUTDIR
+ done
+ zip -r $OUTDIR".zip" $OUTDIR
+ rm -rf $OUTDIR
+done