From 83adfd2484e1485c07a2c97b163618dec12cb32e Mon Sep 17 00:00:00 2001
From: Nate McMaster <nate.mcmaster@microsoft.com>
Date: Mon, 18 Sep 2017 13:06:07 -0700
Subject: [PATCH] Find commit hashes from the TeamCity environment variables

---
 build/repo.targets | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/build/repo.targets b/build/repo.targets
index ec54c6583b..552c154969 100644
--- a/build/repo.targets
+++ b/build/repo.targets
@@ -202,6 +202,16 @@
 
   <!-- Based on the solution here: http://stackoverflow.com/a/11331566 -->
   <Target Name="_GetRepositoryCommits" Outputs="%(Repository.Identity)">
+    <PropertyGroup>
+      <!--
+        Attempt to read environment variables set up by the CI's VCS Root if available.
+        * BUILD_VCS_URL_<RepositoryName> gives us the clone URL for a repository
+        * BUILD_VCS_NUMBER_<RepositoryName> gives us the commit hash for a repository.
+      -->
+      <_RepositoryName>$([System.String]::new('%(Repository.Identity)').Replace('.', '_'))</_RepositoryName>
+      <_CloneUrl>$([System.Environment]::GetEnvironmentVariable("BUILD_VCS_URL_$(_RepositoryName)"))</_CloneUrl>
+      <_CommitHash>$([System.Environment]::GetEnvironmentVariable("BUILD_VCS_NUMBER_$(_RepositoryName)"))</_CommitHash>
+    </PropertyGroup>
 
     <Warning Text="%(Repository.Identity) has not been cloned."
       Condition="!Exists('%(Repository.RepositoryPath)')" />