Enable building dotnet-CLI for centos.

I had to patch up a redhat dnx package which supports NETStandard.Library package. It is currently uploaded to dotnet-cli blob storage. This hack will no longer be required when we move to xplat nuget to do 'dotnet restore'. Apart from this there are three issues that are tracked for centos.
- compile-native not yet supported - https://github.com/dotnet/cli/issues/453
- dnu restore crashes intermittently on centos. I need to investigate this a little bit more and file issues on dnx or coreclr. This will make our CI builds very flaky.
- Dotnet restore does not restore native shims when using “centos.7-x64” - https://github.com/dotnet/corefx/issues/5066

netci.groovy

@@ -7,11 +7,12 @@ import jobs.generation.Utilities;
 
 def project = GithubProject
 
-def osList = ['Ubuntu', 'OSX', 'Windows_NT']
+def osList = ['Ubuntu', 'OSX', 'Windows_NT', 'CentOS7.1']
 
 def machineLabelMap = ['Ubuntu':'ubuntu-doc',
                        'OSX':'mac',
-                       'Windows_NT':'windows']
+                       'Windows_NT':'windows',
+                       'CentOS7.1' : 'centos-71']
 
 def static getBuildJobName(def configuration, def os) {
     return configuration.toLowerCase() + '_' + os.toLowerCase()

scripts/_common.sh

@@ -77,16 +77,14 @@ if [ -z "$RID" ]; then
     if [ "$UNAME" == "Darwin" ]; then
         export OSNAME=osx
         export RID=osx.10.10-x64
-        export DNX_FLAVOR="dnx-coreclr-darwin-x64"
     elif [ "$UNAME" == "Linux" ]; then
         # Detect Distro
         if [ "$(cat /etc/*-release | grep -cim1 ubuntu)" -eq 1 ]; then
             export OSNAME=ubuntu
             export RID=ubuntu.14.04-x64
-            export DNX_FLAVOR="dnx-coreclr-linux-x64"
         elif [ "$(cat /etc/*-release | grep -cim1 centos)" -eq 1 ]; then
             export OSNAME=centos
-            export RID=centos.7-x64
+            export RID=centos.7.1-x64
         else
             error "unknown Linux Distro" 1>&2
         fi
@@ -96,11 +94,8 @@ if [ -z "$RID" ]; then
     fi
 fi
 
-export DNX_VERSION="1.0.0-rc1-update1"
-
 export REPOROOT=$(cd $COMMONDIR/.. && pwd)
 export OUTPUT_ROOT=$REPOROOT/artifacts/$RID
-export DNX_DIR=$OUTPUT_ROOT/dnx
 export STAGE1_DIR=$OUTPUT_ROOT/stage1
 export STAGE2_DIR=$OUTPUT_ROOT/stage2
 export HOST_DIR=$OUTPUT_ROOT/corehost

scripts/compile.sh

@@ -16,6 +16,37 @@ DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
 
 source "$DIR/_common.sh"
 
+getDnx()
+{
+    DNX_FEED="https://api.nuget.org/packages"
+    DNX_VERSION="1.0.0-rc1-update1"
+    DNX_DIR=$OUTPUT_ROOT/dnx
+
+    if [ "$OSNAME" == "osx" ]; then
+        DNX_FLAVOR="dnx-coreclr-darwin-x64"
+    elif [ "$OSNAME" == "ubuntu" ]; then
+        DNX_FLAVOR="dnx-coreclr-linux-x64"
+    elif [ "$OSNAME" == "centos"  ]; then
+        # No support dnx on redhat yet.
+        # using patched dnx
+        DNX_FEED="https://dotnetcli.blob.core.windows.net/dotnet/redhat_dnx"
+        DNX_VERSION="1.0.0-rc2-15000"
+        DNX_FLAVOR="dnx-coreclr-redhat-x64"
+    else
+        error "unknown OS: $OSNAME" 1>&2
+        exit 1
+    fi
+
+    header "Downloading DNX $DNX_VERSION"
+    DNX_URL="$DNX_FEED/$DNX_FLAVOR.$DNX_VERSION.nupkg"
+    DNX_ROOT="$DNX_DIR/bin"
+    rm -rf $DNX_DIR
+    mkdir -p $DNX_DIR
+    curl -o $DNX_DIR/dnx.zip $DNX_URL --silent
+    unzip -qq $DNX_DIR/dnx.zip -d $DNX_DIR
+    chmod a+x $DNX_ROOT/dnu $DNX_ROOT/dnx
+}
+
 if ! type -p cmake >/dev/null; then
     error "cmake is required to build the native host 'corehost'"
     error "OS X w/Homebrew: 'brew install cmake'"
@@ -26,14 +57,8 @@ fi
 [ -z "$CONFIGURATION" ] && export CONFIGURATION=Debug
 
 # Download DNX to copy into stage2
-header "Downloading DNX $DNX_VERSION"
+getDnx
-DNX_URL="https://api.nuget.org/packages/$DNX_FLAVOR.$DNX_VERSION.nupkg"
+
-DNX_ROOT="$DNX_DIR/bin"
-rm -rf $DNX_DIR
-mkdir -p $DNX_DIR
-curl -o $DNX_DIR/dnx.zip $DNX_URL --silent
-unzip -qq $DNX_DIR/dnx.zip -d $DNX_DIR
-chmod a+x $DNX_ROOT/dnu $DNX_ROOT/dnx
 
 # Ensure the latest stage0 is installed
 $DIR/install.sh
@@ -103,9 +128,13 @@ cp -R $DNX_ROOT $STAGE2_DIR/bin/dnx
 cp $DIR/dotnet-restore.sh $STAGE2_DIR/bin/dotnet-restore
 chmod a+x $STAGE2_DIR/bin/dotnet-restore
 
+# No compile native support in centos yet
+# https://github.com/dotnet/cli/issues/453
+if [ "$OSNAME" != "centos"  ]; then
     # Copy in AppDeps
     header "Acquiring Native App Dependencies"
     DOTNET_HOME=$STAGE2_DIR DOTNET_TOOLS=$STAGE2_DIR $REPOROOT/scripts/build/build_appdeps.sh "$STAGE2_DIR/bin"
+fi
 
 # Stamp the output with the commit metadata
 COMMIT_ID=$(git rev-parse HEAD)
@@ -115,9 +144,13 @@ echo $COMMIT_ID > $STAGE2_DIR/.commit
 header "Testing stage2 ..."
 DOTNET_HOME=$STAGE2_DIR DOTNET_TOOLS=$STAGE2_DIR $DIR/test/smoke-test.sh
 
+# Skipping E2E tests for centos
+# tracked by issue - https://github.com/dotnet/corefx/issues/5066
+if [ "$OSNAME" != "centos"  ]; then
     # E2E test on the output
     header "Testing stage2 End to End ..."
     DOTNET_HOME=$STAGE2_DIR DOTNET_TOOLS=$STAGE2_DIR $DIR/test/e2e-test.sh
+fi
 
 # Run Validation for Project.json dependencies
 dotnet publish "$REPOROOT/tools/MultiProjectValidator" -o "$STAGE2_DIR/../tools"

scripts/test/smoke-test.sh

@@ -18,7 +18,7 @@ REPOROOT="$( cd -P "$DIR/../.." && pwd )"
 source "$DIR/../_common.sh"
 
 rm "$REPOROOT/test/TestApp/project.lock.json"
-dotnet restore "$REPOROOT/test/TestApp" --runtime "osx.10.10-x64" --runtime "ubuntu.14.04-x64" --runtime "win7-x64"
+dotnet restore "$REPOROOT/test/TestApp" --runtime "$RID"
 dotnet compile "$REPOROOT/test/TestApp" --output "$REPOROOT/artifacts/$RID/smoketest"
 
 # set -e will abort if the exit code of this is non-zero

src/Microsoft.DotNet.ProjectModel/RuntimeIdentifier.cs

@@ -1,6 +1,8 @@
 // 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.
 
+using System;
+using System.IO;
 using System.Runtime.InteropServices;
 
 namespace Microsoft.DotNet.ProjectModel
@@ -17,14 +19,51 @@ namespace Microsoft.DotNet.ProjectModel
                 return "win7-x64";
             }
             else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                if(IsCentOS())
+                {
+                    return "centos.7.1-x64";
+                }
+                else if(IsUbuntu())
                 {
                     return "ubuntu.14.04-x64";
                 }
+                else
+                {
+                    // unknown distro. Lets fail fast
+                    throw new InvalidOperationException("Current linux distro is not supported.");
+                }
+            }
             else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
             {
                 return "osx.10.10-x64";
             }
-            return "unknown";
+
+            throw new InvalidOperationException("Current operating system is not supported.");
+        }
+
+        private static bool IsCentOS()
+        {
+            return IsLinuxDistro("centos");
+        }
+
+        private static bool IsUbuntu()
+        {
+            return IsLinuxDistro("ubuntu");
+        }
+
+        private static bool IsLinuxDistro(string distro)
+        {
+            // HACK - A file which can be found in most linux distros
+            // Did not test in non-en distros
+            const string OSIDFILE = "/etc/os-release";
+
+            if(!File.Exists(OSIDFILE))
+            {
+                return false;
+            }
+
+            return File.ReadAllText(OSIDFILE).ToLower().Contains(distro);
         }
     }
 }