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POMSBuild BuildInParallel, custom task spawning process that fails to run
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copied!<p>I'm using the BuildInParallel attribute of the MSBuild task to run build projects in parallel. The root project is building four child projects. The child projects are using a custom MSBuild task which starts a new process using System.Diagnostics.Process. For some reason the spawned process fails to run properly when UseShellExecute is false. I've no idea why this is and I can't figure out what the error is - all that happens is the Process.ExitCode is 1, no exception..</p> <p>Here's the custom MSBuild task:</p> <pre><code>using System; using Microsoft.Build.Utilities; using System.Diagnostics; public class MSBuildProcessTask : Task { public string Executable { get; set; } public string Arguments { get; set; } public override bool Execute() { using (var p = new Process()) { try { p.StartInfo = new ProcessStartInfo(Executable, Arguments) { UseShellExecute = false, //RedirectStandardOutput = true }; //p.OutputDataReceived += (o, e) => //{ // if (e.Data != null) // { // Log.LogMessage(MessageImportance.Normal, e.Data); // } //}; p.Start(); //p.BeginOutputReadLine(); p.WaitForExit(); } catch (Exception e) { throw; // for setting breakpoint } finally { if (p.ExitCode != 0) { Log.LogError("Error. Exit code: " + p.ExitCode); } p.Close(); } } return true; } } </code></pre> <p>And here's the root MSBuild project file (Test.proj, actually I'm only building two child project here but still get the error..):</p> <pre><code><?xml version="1.0" encoding="utf-8" ?> <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <UsingTask TaskName="MSBuildProcessTask" AssemblyFile="C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\bin\Debug\MSBuildProcessTask.dll" /> <Target Name="Default"> <ItemGroup> <ProjectFiles Include="$(MSBuildProjectDirectory)\Test.1.proj" /> <ProjectFiles Include="$(MSBuildProjectDirectory)\Test.2.proj" />  </ItemGroup> <MSBuild BuildInParallel="true" Projects="@(ProjectFiles)" /> </Target> </Project> </code></pre> <p>And here's an example of the child project files (Test.1.proj):</p> <pre><code><?xml version="1.0" encoding="utf-8" ?> <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <UsingTask TaskName="MSBuildProcessTask" AssemblyFile="C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\bin\Debug\MSBuildProcessTask.dll" /> <Target Name="Default"> <Message Text="Hello" /> <MSBuildProcessTask Executable="sqlcmd" Arguments="-S .\SQLEXPRESS -Q &quot;SELECT @@VERSION&quot;" /> </Target> </Project> </code></pre> <p>My command line is: <code>C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe /m /nr:false C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj</code></p> <p>And here's a sample output:</p> <pre><code>C:\Users\Tom>C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe /m /nr:false C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildPr ocessTask\Test.proj Microsoft (R) Build Engine Version 4.0.30319.1 [Microsoft .NET Framework, Version 4.0.30319.235] Copyright (C) Microsoft Corporation 2007. All rights reserved. Build started 16/08/2011 22:22:06. 1>Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" on node 1 (default targets). 1>Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (1) is building "C:\Users\Tom\Sandbox\reposito ry_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.1.proj" (2) on node 1 (default targets). 2>Default: Hello 1>Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (1) is building "C:\Users\Tom\Sandbox\reposito ry_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj" (3) on node 2 (default targets). ------------------------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------------------------ Microsoft SQL Server 2008 (SP1) - 10.0.2531.0 (X64) Mar 29 2009 10:11:52 Copyright (c) 1988-2008 Microsoft Corporation Express Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1) (1 rows affected) 3>Default: Hello 2>Done Building Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.1.proj" (default targets). 3>C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj(6,3): error : Error. Exit code: 1 3>Done Building Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj" (default targets). 1>Done Building Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (default targets). Build succeeded. "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (default target) (1) -> "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj" (default target) (3) -> (Default target) -> C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj(6,3): error : Error. Exit code: 1 0 Warning(s) 1 Error(s) Time Elapsed 00:00:00.23 C:\Users\Tom> </code></pre> <p>As you can see we only get output from one of the SQLCMD commands.</p>

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