[infra] Add script for downloading a batch of corpus backups (for #1547). (#1713)

* [infra] Add script for downloading a batch of corpus backups (for #1547).

* Add missing wget dependency and replace a tab with spaces.

* Convert more tabs to spaces.

infra/base-images/base-runner/Dockerfile

@@ -17,9 +17,10 @@
 FROM gcr.io/oss-fuzz-base/base-image
 MAINTAINER mike.aizatsky@gmail.com
 RUN apt-get install -y zip file libunwind8 binutils libblocksruntime0 \
-    fonts-dejavu python3 libcap2
-COPY bad_build_check coverage llvm-cov llvm-profdata llvm-symbolizer reproduce \
-    run_fuzzer sancov test_all minijail0 run_minijail targets_list /usr/local/bin/
+    fonts-dejavu python3 libcap2 wget
+COPY bad_build_check coverage download_corpus llvm-cov llvm-profdata \
+    llvm-symbolizer reproduce run_fuzzer sancov test_all minijail0 \
+    run_minijail targets_list /usr/local/bin/
 
 # Default environment options for various sanitizers.
 # Note that these match the settings used in ClusterFuzz and

infra/base-images/base-runner/download_corpus

@@ -0,0 +1,26 @@
+#!/bin/bash -u
+# Copyright 2018 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://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.
+#
+################################################################################
+
+if (( $# < 1 )); then
+  echo "Usage: $0 \"path_download_to url_download_from\" (can be repeated)" >&2
+  exit 1
+fi
+
+for pair in "$@"; do
+  read path url <<< "$pair"
+  wget -q -O $path $url
+done