Add runtime switch between MSBuild and xbuild

Author: asbjornu

src/GitVersionExe.Tests/ExecCmdLineArgumentTest.cs

@@ -1,14 +1,12 @@
 using System.IO;
 using GitTools.Testing;
+using GitVersion;
 using NUnit.Framework;
 using Shouldly;
 
 [TestFixture]
 public class ExecCmdLineArgumentTest
 {
-    const string MsBuild = @"c:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe";
-
-
     [Test]
     public void RunExecViaCommandLine()
     {
@@ -26,7 +24,7 @@ public void RunExecViaCommandLine()
   </Target>
 </Project>";
             File.WriteAllText(buildFile, buildFileContent);
-            var result = GitVersionHelper.ExecuteIn(fixture.RepositoryPath, MsBuild, "RunExecViaCommandLine.proj /target:OutputResults");
+            var result = GitVersionHelper.ExecuteIn(fixture.RepositoryPath, SpecifiedArgumentRunner.BuildTool, "RunExecViaCommandLine.proj /target:OutputResults");
 
             result.ExitCode.ShouldBe(0);
             result.Log.ShouldContain("GitVersion_FullSemVer: 1.2.4+1");

src/GitVersionExe/SpecifiedArgumentRunner.cs

@@ -9,10 +9,13 @@ namespace GitVersion
 
     class SpecifiedArgumentRunner
     {
-        const string MsBuild = @"c:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe";
+        private static readonly bool runningOnMono = Type.GetType("Mono.Runtime") != null;
+        public static readonly string BuildTool = runningOnMono? "xbuild" : @"c:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe";
 
         public static void Run(Arguments arguments, IFileSystem fileSystem)
         {
+            Logger.WriteInfo(string.Format("Running on {0}.", runningOnMono ? "Mono" : "Windows"));
+
             var noFetch = arguments.NoFetch;
             var authentication = arguments.Authentication;
             var targetPath = arguments.TargetPath;
@@ -74,14 +77,14 @@ static bool RunMsBuildIfNeeded(Arguments args, string workingDirectory, VersionV
         {
             if (string.IsNullOrEmpty(args.Proj)) return false;
 
-            Logger.WriteInfo(string.Format("Launching {0} \"{1}\" {2}", MsBuild, args.Proj, args.ProjArgs));
+            Logger.WriteInfo(string.Format("Launching build tool {0} \"{1}\" {2}", BuildTool, args.Proj, args.ProjArgs));
             var results = ProcessHelper.Run(
                 Logger.WriteInfo, Logger.WriteError,
-                null, MsBuild, string.Format("\"{0}\" {1}", args.Proj, args.ProjArgs), workingDirectory,
+                null, BuildTool, string.Format("\"{0}\" {1}", args.Proj, args.ProjArgs), workingDirectory,
                 GetEnvironmentalVariables(variables));
 
             if (results != 0)
-                throw new WarningException("MsBuild execution failed, non-zero return code");
+                throw new WarningException(string.Format("{0} execution failed, non-zero return code", runningOnMono ? "XBuild" : "MSBuild"));
 
             return true;
         }