[infra] building clang with a single RUN command.

Each RUN command creates an overlay layer. This results in keeeping all
intermediate files.

By consolidating all work in a single script, the size of base-clang
image is decreased from 3G to 1G.

infra/base-images/base-clang/Dockerfile

@@ -19,33 +19,13 @@
 FROM ossfuzz/base
 MAINTAINER mike.aizatsky@gmail.com
 
-ENV LLVM_DEP_PACKAGES "build-essential make cmake ninja-build git python2.7"
-RUN apt-get install -y $LLVM_DEP_PACKAGES
-
 RUN mkdir /src /work
 
-# Checkout
-RUN cd /src && git clone --depth 1 http://llvm.org/git/llvm.git
-RUN cd /src/llvm/tools && git clone --depth 1 http://llvm.org/git/clang.git
-RUN cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/compiler-rt.git
-RUN cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/libcxx.git
-RUN cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/libcxxabi.git
-RUN cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/lld.git
-
-# Build & Install
-RUN mkdir -p /work/llvm
-WORKDIR /work/llvm
-RUN cmake -G "Ninja" \
-    -DLIBCXX_ENABLE_SHARED=OFF -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON \
-    -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="X86" \
-    /src/llvm
-RUN ninja
-RUN ninja install
-RUN rm -rf /work/llvm
-
-# Copy libfuzzer sources
-RUN mkdir /src/libfuzzer
-RUN cp -r /src/llvm/lib/Fuzzer/* /src/libfuzzer/
+COPY checkout_build_install_llvm.sh /root/
+# Keep all steps in the same script to decrease the number of intermediate
+# layes in docker file. 
+RUN /root/checkout_build_install_llvm.sh
+RUN rm /root/checkout_build_install_llvm.sh
 
 # Setup the environment.
 ENV CC "clang"
@@ -55,23 +35,3 @@ ENV CCC "clang++"
 ENV CFLAGS "-g"
 ENV CXXFLAGS_EXTRA "-stdlib=libc++"
 ENV CXXFLAGS "$CFLAGS $CXXFLAGS_EXTRA"
-
-# Build MSan libraries
-RUN mkdir -p /work/llvm-msan
-WORKDIR /work/llvm-msan
-RUN cmake -G "Ninja" \
-    -DLIBCXX_ENABLE_SHARED=OFF -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON \
-    -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_SANITIZER=Memory \
-    /src/llvm
-# RUN ninja cxx cxxabi
-# RUN mkdir /usr/local/lib/msan
-# RUN cp lib/*.so /usr/local/lib/msan
-# RUN cp lib/*.a /usr/local/lib/msan
-RUN rm -rf /work/llvm-msan
-
-# Cleanup
-RUN rm -rf /src/llvm
-RUN apt-get remove --purge -y $LLVM_DEP_PACKAGES
-RUN apt-get autoremove -y
-
-

infra/base-images/base-clang/checkout_build_install_llvm.sh

@@ -0,0 +1,47 @@
+#!/bin/bash -eux
+# Copyright 2016 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.
+#
+################################################################################
+
+LLVM_DEP_PACKAGES="build-essential make cmake ninja-build git python2.7"
+apt-get install -y $LLVM_DEP_PACKAGES
+
+# Checkout
+cd /src && git clone --depth 1 http://llvm.org/git/llvm.git
+cd /src/llvm/tools && git clone --depth 1 http://llvm.org/git/clang.git
+cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/compiler-rt.git
+cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/libcxx.git
+cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/libcxxabi.git
+cd /src/llvm/projects && git clone --depth 1 http://llvm.org/git/lld.git
+
+# Build & Install
+mkdir -p /work/llvm
+cd /work/llvm
+cmake -G "Ninja" \
+      -DLIBCXX_ENABLE_SHARED=OFF -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON \
+      -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="X86" \
+      /src/llvm
+ninja
+ninja install
+rm -rf /work/llvm
+
+# Copy libfuzzer sources
+mkdir /src/libfuzzer
+cp -r /src/llvm/lib/Fuzzer/* /src/libfuzzer/
+
+# Cleanup
+rm -rf /src/llvm
+apt-get remove --purge -y $LLVM_DEP_PACKAGES
+apt-get autoremove -y