Add RedHat6 to official builds of core-setup in master branch (#3024)

* Add RedHat6 to official builds of core-setup in master branch

Add RedHat6 to official builds of core-setup in master branch, this is
identical to the PR to enable Rhel6 in release/2.0.0:
https://github.com/dotnet/core-setup/pull/3017

* Rename the RID.

Rename the RID as we don't have a RID for 6.9.

* Update docker tag and add logic to detect RHEL6 in init-tools.sh

Update docker tag and add logic to detect RHEL6 in init-tools.sh

* Port changes from Release/2.0.0 to fix core-setup RHEL 6 official runs.

Port changes from Release/2.0.0 to fix core-setup RHEL 6 official runs.

* Fix indentation

Fix indentation

* Port one more related commit from release/2.0.0 back to master

Port one more related commit from release/2.0.0 back to master, which
is:

15e34cd2c5

* Update to use the correction version of runtimemodel

Update to use the correction version of runtimemodel

* Try to fix the CI error by updating NugetModelTFM to net45

Try to fix the CI error by updating NugetModelTFM to net45

* Revert "Try to fix the CI error by updating NugetModelTFM to net45"

This reverts commit d740f18750362245427b67ca45301f60b31faa47.

* Remove runtimemodel reference

I built core-setup locally, and didn't see runtimemodel package any more
with current version 4.3.0-preview2-4095. It is possible that it might
not be needed any longer.

Remove it first and verify it all works. If there is still runtime
errors then we may need to explicitly add a package reference to it

* Remove unused NugetModelTFM node as well

Remove unused NugetModelTFM node as well

* Remove extra spaces

Remove extra spaces

build.proj

@@ -6,7 +6,7 @@
   <PropertyGroup>
     <SerializeProjects>true</SerializeProjects>
   </PropertyGroup>
-  
+
   <PropertyGroup>
     <!-- To disable the restoration of packages, set RestoreDuringBuild=false or pass /p:RestoreDuringBuild=false.-->
     <RestoreDuringBuild Condition="'$(RestoreDuringBuild)'==''">true</RestoreDuringBuild>

buildpipeline/pipeline.json

@@ -31,22 +31,37 @@
           }
         },
         {
-          "Name": "Core-Setup-Linux-Arm-BT", 
-          "Parameters": { 
-            "PB_DistroRid": "ubuntu.14.04-arm", 
-            "PB_DockerTag": "ubuntu-14.04-cross-0cd4667-20172211042239", 
-            "PB_TargetArchitecture": "arm", 
+          "Name": "Core-Setup-Linux-Arm-BT",
+          "Parameters": {
+            "PB_DistroRid": "rhel.6-x64",
+            "PB_DockerTag": "centos-6-c8c9b08-20174310104313",
+            "PB_TargetArchitecture": "x64",
+            "PB_AdditionalBuildArguments":"-TargetArchitecture=x64 -DistroRid=rhel.6-x64 -PortableBuild=false -strip-symbols",
+            "PB_PortableBuild": "false"
+          },
+          "ReportingParameters": {
+            "OperatingSystem": "RedHat6",
+            "Type": "build/product/",
+            "Platform": "x64"
+          }
+        },
+        {
+          "Name": "Core-Setup-Linux-Arm-BT",
+          "Parameters": {
+            "PB_DistroRid": "ubuntu.14.04-arm",
+            "PB_DockerTag": "ubuntu-14.04-cross-0cd4667-20172211042239",
+            "PB_TargetArchitecture": "arm",
             "PB_AdditionalBuildArguments":"-TargetArchitecture=arm -DistroRid=linux-arm -DisableCrossgen=true -PortableBuild=true -SkipTests=true -CrossBuild=true -strip-symbols",
             "PB_CrossBuildArgs": "-e ROOTFS_DIR ",
-            "PB_PortableBuild": "true" 
-          }, 
-          "ReportingParameters": { 
-            "SubType": "PortableBuild", 
-            "OperatingSystem": "Ubuntu 14.04", 
-            "Type": "build/product/", 
-            "Platform": "arm" 
-          } 
-        },         
+            "PB_PortableBuild": "true"
+          },
+          "ReportingParameters": {
+            "SubType": "PortableBuild",
+            "OperatingSystem": "Ubuntu 14.04",
+            "Type": "build/product/",
+            "Platform": "arm"
+          }
+        },
         {
           "Name": "Core-Setup-OSX-BT",
           "Parameters": {

dir.targets

@@ -20,7 +20,7 @@
       <DependencyModelTFM>netstandard1.3</DependencyModelTFM>
       <DependencyModelTFM Condition="'$(MSBuildRuntimeType)' != 'Core'">net451</DependencyModelTFM>
     </PropertyGroup>
-    
+
       <ItemGroup>
         <CustomTaskDependencies Include="$(BuildToolsTaskDir)Newtonsoft.Json.dll" />
         <CustomTaskDependencies Include="$(BuildToolsTaskDir)Microsoft.DotNet.PlatformAbstractions.dll" />

init-tools.sh

@@ -33,6 +33,14 @@ OSName=$(uname -s)
         Linux)
             __DOTNET_PKG=dotnet-dev-linux-x64
             OS=Linux
+			
+            if [ -e /etc/redhat-release ]; then
+                redhatRelease=$(</etc/redhat-release)
+                if [[ $redhatRelease == "CentOS release 6."* || $redhatRelease == "Red Hat Enterprise Linux Server release 6."* ]]; then
+                    __DOTNET_PKG=dotnet-dev-rhel.6-x64
+                fi
+            fi			
+			
             ;;
 
         *)