[libfuzzer] support of custom libfuzzer options via .options file.

testing/libfuzzer/gen_fuzzer_runner.py

 #!/usr/bin/python
 #
 # Copyright (c) 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Generate .sh runner for libfuzzer test.
 
 Invoked by GN from fuzzer_test.gni.
 """
 
 import argparse
 import os
 import sys
 
 
 parser = argparse.ArgumentParser(description="Generate fuzzer launcher.")
 parser.add_argument('--fuzzer', required=True)
 parser.add_argument('--launcher', required=True)
-parser.add_argument('--dict', required=True)
+parser.add_argument('--dict', required=False)
+parser.add_argument('--params', required=False)
 args = parser.parse_args()
 
 out = open(args.launcher, 'w')
-out.write("""#!/bin/bash
+
+launcher_source_code = """#!/bin/bash
 set -ue
 DIR=$(dirname $0)
-$DIR/%(fuzzer)s -dict=$DIR/%(dict)s $*
-""" % { "fuzzer": args.fuzzer, "dict": args.dict })
+$DIR/%(fuzzer)s""" % {"fuzzer": args.fuzzer}
+
+if args.dict:
+  launcher_source_code += " -dict=$DIR/%(dict)s" % { "dict": args.dict }

[aizatsky, 2016/02/16 18:25:05]

build arguments first and insert them into the template, rather than appending
to the result. 

[mmoroz, 2016/02/17 10:36:48]

Done.

+
+launcher_source_code += " $*"
+
+# Put custom parameters after "$*" to overwrite default values from ClusterFuzz.
+if args.params:
+  launcher_source_code += " %(params)s" % { "params": args.params[1 : -1]}
+
+launcher_source_code += "\n"
+
+out.write(launcher_source_code)
 out.close()
 
 os.chmod(args.launcher, os.stat(args.launcher).st_mode | 0o111) # chmod a+x