Enable docker support for centos builds

- Added an option '--buildindocker <osname>' to build.sh
- Fixed bug which caused packaging to be skipped by default.
- Fixed bug which caused tarballs to be generated twice.
- Fixed bug to propagate build params(like debug, nopackage) to docker build.

scripts/docker/centos/Dockerfile

@@ -0,0 +1,49 @@
+#
+# Copyright (c) .NET Foundation and contributors. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+#
+
+# Dockerfile that creates a container suitable to build dotnet-cli
+FROM centos:7.1.1503
+
+RUN yum -q -y install deltarpm
+RUN yum -q -y install epel-release
+# RUN yum -y update
+
+# This could become a "microsoft/coreclr" image, since it just installs the dependencies for CoreCLR (and stdlib)
+# Install CoreCLR and CoreFx dependencies
+RUN yum -q -y install unzip libunwind gettext libcurl-devel openssl-devel zlib libicu-devel
+
+# RUN apt-get update && \
+#     apt-get -qqy install unzip curl libicu-dev libunwind8 gettext libssl-dev libcurl3-gnutls zlib1g liblttng-ust-dev lldb-3.6-dev lldb-3.6 
+
+# Install Build Prereqs
+RUN yum -q -y install tar git cmake clang make
+
+# Use clang as c++ compiler
+RUN update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++ 100
+RUN update-alternatives --set c++ /usr/bin/clang++
+
+# Install azure cli. We need this to publish artifacts.
+RUN yum -y install nodejs && \
+    yum -y install npm && \
+    npm install -g azure-cli
+
+
+RUN yum -q -y install sudo
+
+# Setup User to match Host User, and give superuser permissions
+ARG USER_ID=0
+RUN useradd -m code_executor -u ${USER_ID} -g root
+RUN echo 'code_executor ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
+# With the User Change, we need to change permssions on these directories
+RUN chmod -R a+rwx /usr/local
+RUN chmod -R a+rwx /home
+RUN chmod -R 755 /usr/bin/sudo
+
+# Set user to the one we just created
+USER ${USER_ID}
+
+# Set working directory
+WORKDIR /opt/code

scripts/docker/dockerbuild.sh

@@ -21,11 +21,12 @@ cd $REPOROOT
 [ -z "$DOTNET_BUILD_CONTAINER_TAG" ] && DOTNET_BUILD_CONTAINER_TAG="dotnetcli-build"
 [ -z "$DOTNET_BUILD_CONTAINER_NAME" ] && DOTNET_BUILD_CONTAINER_NAME="dotnetcli-build-container"
 [ -z "$DOCKER_HOST_SHARE_DIR" ] && DOCKER_HOST_SHARE_DIR=$(pwd)
-[ -z "$BUILD_COMMAND" ] && BUILD_COMMAND="/opt/code/build.sh"
+[ -z "$DOCKER_OS" ] && DOCKER_OS=$OSNAME
+[ -z "$BUILD_COMMAND" ] && BUILD_COMMAND="/opt/code/scripts/build/build.sh"
 
 # Build the docker container (will be fast if it is already built)
 header "Building Docker Container"
-docker build --build-arg USER_ID=$(id -u) -t $DOTNET_BUILD_CONTAINER_TAG scripts/docker/ 
+docker build --build-arg USER_ID=$(id -u) -t $DOTNET_BUILD_CONTAINER_TAG scripts/docker/$DOCKER_OS
 
 # Run the build in the container
 header "Launching build in Docker Container"
@@ -43,4 +44,5 @@ docker run -t --rm --sig-proxy=true \
     -e REPO_USER \
     -e REPO_PASS \
     -e REPO_SERVER \
-    $DOTNET_BUILD_CONTAINER_TAG $BUILD_COMMAND $1
+    $DOTNET_BUILD_CONTAINER_TAG \
+    bash -c "${BUILD_COMMAND}"