Make MSBuild Exec Command with git log work cross-platform

To avoid being "DenverCoder9" here is a final working solution:

There are two options both using the power of the Condition attribute.

Option 1:

Duplicate the PreBuild Exec element each with a condition for Unix like OS and one for non Unix like OS.

<Target Name="PreBuild" BeforeTargets="PreBuildEvent">
  <Exec Condition="!$([MSBuild]::IsOSUnixLike())" Command="git log -1 --format=&quot;Git commit %25%25h committed on %25%25cd by %25%25cn&quot; --date=iso &gt; &quot;$(ProjectDir)/version.txt&quot;" />
  <Exec Condition="$([MSBuild]::IsOSUnixLike())" Command="git log -1 --format=&quot;Git commit %25h committed on %25cd by %25cn&quot; --date=iso &gt; &quot;$(ProjectDir)/version.txt&quot;" />
</Target>

Option 2:

Add a property group to the Directory.Build.props file at the root level of you application and use it in your PreBuild Exec command.

<!-- file: Directory.Build.props -->
<Project> 
  <!-- Adds batch file escape character for targets using Exec command when run on Windows -->
  <PropertyGroup Condition="!$([MSBuild]::IsOSUnixLike())">
    <AddEscapeIfWin>%25</AddEscapeIfWin>
  </PropertyGroup>
</Project> 

<!-- Use in *.csproj -->
<Target Name="PreBuild" BeforeTargets="PreBuildEvent">
  <Exec Command="git log -1 --format=&quot;Git commit $(AddEscapeIfWin)%25h committed on $(AddEscapeIfWin)%25cd by $(AddEscapeIfWin)%25cn&quot; --date=iso &gt; &quot;$(ProjectDir)/Resources/version.txt&quot;" />
</Target>