Revert "Remove 16.04 ubuntu legs and old docker files." (#13861)

.vsts-ci.yml

@@ -156,6 +156,13 @@ stages:
       strategy:
         matrix:
           ${{ if or(eq(variables['System.TeamProject'], 'public'), in(variables['Build.Reason'], 'PullRequest')) }}:
+            Build_Ubuntu_16_04_Debug_x64:
+              _BuildConfig: Debug
+              _DockerParameter: '--docker ubuntu.16.04'
+              _LinuxPortable: ''
+              _RuntimeIdentifier: ''
+              _BuildArchitecture: 'x64'
+              _TestArg: $(_NonWindowsTestArg)
             Build_Ubuntu_18_04_Debug_x64:
               _BuildConfig: Debug
               _DockerParameter: '--docker ubuntu.18.04'
@@ -290,7 +297,7 @@ stages:
               _AdditionalBuildParameters: '/p:HostOSName="linux-musl"'
             Build_Linux_Portable_Deb_Release_x64:
               _BuildConfig: Release
-              _DockerParameter: '--docker ubuntu.18.04'
+              _DockerParameter: '--docker ubuntu.16.04'
               _LinuxPortable: '--linux-portable'
               _RuntimeIdentifier: ''
               _BuildArchitecture: 'x64'

eng/docker/ubuntu.16.04/Dockerfile

@@ -0,0 +1,65 @@
+#
+# 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.
+#
+
+FROM ubuntu:16.04
+
+# Install the base toolchain we need to build anything (clang, cmake, make and the like)
+# this does not include libraries that we need to compile different projects, we'd like
+# them in a different layer.
+RUN rm -rf rm -rf /var/lib/apt/lists/* && \
+    apt-get clean && \
+    apt-get update && \
+    apt-get install -y cmake \
+            make \
+            llvm-3.5 \
+            clang-3.5 \
+            git \
+            curl \
+            tar \
+            sudo && \
+    apt-get clean
+
+# Install Build Prereqs
+RUN apt-get -qqy install \
+        debhelper \
+        build-essential \
+        devscripts && \
+    apt-get clean
+
+# Dependencies for CoreCLR and CoreFX
+RUN apt-get install -y  libunwind8 \
+            libkrb5-3 \
+            libicu55 \
+            liblttng-ust0 \
+            libssl1.0.0 \
+            zlib1g \
+            libuuid1 \
+            liblldb-3.6 && \
+    apt-get clean
+
+# Setup User to match Host User, and give superuser permissions
+ARG USER_ID=0
+RUN useradd -m code_executor -u ${USER_ID} -g sudo
+RUN echo 'code_executor ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
+# With the User Change, we need to change permissions on these directories
+RUN chmod -R a+rwx /usr/local
+RUN chmod -R a+rwx /home
+RUN chmod -R 755 /usr/lib/sudo
+
+# Set working directory 
+ARG WORK_DIR
+WORKDIR ${WORK_DIR}
+
+# Set up Azure Artifacts credential provider. 
+# We download the installer and execute it using ${USER_ID} so that the installer
+# put the NuGet plugins in the correct $HOME/.nuget folder.
+RUN curl -O https://raw.githubusercontent.com/Microsoft/artifacts-credprovider/master/helpers/installcredprovider.sh 
+RUN chmod +x ./installcredprovider.sh
+
+# Set user to the one we just created
+USER ${USER_ID}
+
+RUN ./installcredprovider.sh

eng/docker/ubuntu.16.10/Dockerfile

@@ -0,0 +1,64 @@
+#
+# 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 ubuntu:16.10
+
+# Misc Dependencies for build
+RUN apt-get update && \
+    apt-get -qqy install \
+        curl \
+        unzip \
+        gettext \
+        sudo && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# This could become a "microsoft/coreclr" image, since it just installs the dependencies for CoreCLR (and stdlib)
+RUN apt-get update && \
+    apt-get -qqy install \
+        libunwind8 \
+        libkrb5-3 \
+        libicu57 \
+        liblttng-ust0 \
+        libssl1.0.0 \
+        zlib1g \
+        libuuid1 \
+        liblldb-3.5 && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install Build Prereqs
+RUN apt-get update && \
+    apt-get -qqy install \
+        debhelper \
+        build-essential \
+        devscripts \
+        git \
+        cmake \
+        clang-3.5 && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Use clang as c++ compiler
+RUN update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++-3.5 100
+RUN update-alternatives --set c++ /usr/bin/clang++-3.5
+
+# Setup User to match Host User, and give superuser permissions
+ARG USER_ID=0
+RUN useradd -m code_executor -u ${USER_ID} -g sudo
+RUN echo 'code_executor ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+
+# With the User Change, we need to change permissions on these directories
+RUN chmod -R a+rwx /usr/local
+RUN chmod -R a+rwx /home
+RUN chmod -R 755 /usr/lib/sudo
+
+# Set user to the one we just created
+USER ${USER_ID}
+
+# Set working directory 
+ARG WORK_DIR
+WORKDIR ${WORK_DIR}