envoy: modified identification of corpus path (#1607)

projects/envoy/Dockerfile

@@ -36,4 +36,4 @@ RUN apt-get update && apt-get install -y bazel
 
 RUN git clone https://github.com/envoyproxy/envoy.git
 WORKDIR /src/envoy/
-COPY build.sh $SRC/
+COPY find_corpus.py build.sh $SRC/

projects/envoy/build.sh

@@ -61,10 +61,11 @@ bazel build --verbose_failures --dynamic_mode=off --spawn_strategy=standalone \
 # Copy out test binaries from bazel-bin/ and zip up related test corpuses.
 for t in ${FUZZER_TARGETS}
 do
+  TARGET_CORPUS=$(python "${SRC}"/find_corpus.py "$t")
   TARGET_BASE="$(expr "$t" : '.*/\(.*\)_fuzz_test')"
   cp bazel-bin/"${t}"_driverless "${OUT}"/"${TARGET_BASE}"_fuzz_test
   zip "${OUT}/${TARGET_BASE}"_fuzz_test_seed_corpus.zip \
-    "$(dirname "${t}")"/"${TARGET_BASE}"_corpus/*
+    "$(dirname "${t}")"/"${TARGET_CORPUS}"/*
 done
 
 # Copy dictionaries and options files to $OUT/

projects/envoy/find_corpus.py

@@ -0,0 +1,23 @@
+#!/usr/bin/python
+
+import os
+import sys
+import re
+
+fuzzer_target = sys.argv[1]
+directory, fuzzer_target_name = os.path.dirname(fuzzer_target), os.path.basename(fuzzer_target)
+path = os.path.join('..', 'envoy', directory, 'BUILD')
+
+with open(path, 'r') as f:
+  searchlines = f.readlines()
+  for i, line in enumerate(searchlines):
+      if fuzzer_target_name in line:
+        for l in searchlines[i:]:
+          if 'corpus =' in l:
+            corpus_path = l
+            break
+try:
+  corpus_path
+except NameError:  
+  raise Exception("No corpus path for the given fuzz target")
+print re.findall(r'"([^"]*)"', corpus_path)[0]