Adding Git Commit Hash to your .NET project assemblies.

README.md

This gets the commit hash from the current HEAD of the branch.

You can use it in your applcation via AssemblyInformation.Current.InformationalVersion.

AssemblyInformation.cs

using System.Reflection;

public record class AssemblyInformation(string Product, string Description, string Version, string InformationalVersion)
{
    public static readonly AssemblyInformation Current = new(typeof(AssemblyInformation).Assembly);

    public AssemblyInformation(Assembly assembly)
        : this(
            assembly.GetCustomAttribute<AssemblyProductAttribute>()!.Product,
            assembly.GetCustomAttribute<AssemblyDescriptionAttribute>()!.Description,
            assembly.GetCustomAttribute<AssemblyFileVersionAttribute>()!.Version,
            assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()!.InformationalVersion)
    {
    }
}

Directory.Build.props

<Project>
  <Choose>
    <When Condition="'$(CI)' == 'true'">
      <!-- On non-official builds we don't burn in a git sha.  In large part because it
           hurts our determinism efforts as binaries which should be the same between
           builds will not (due to developers building against different HEAD
           values -->
      <PropertyGroup>
        <GitHeadSha>&lt;developer build&gt;</GitHeadSha>
      </PropertyGroup>
    </When>
    <When Condition="'$(GITHUB_SHA)' != ''">
      <PropertyGroup>
        <GitHeadSha>$(GITHUB_SHA)</GitHeadSha>
      </PropertyGroup>
    </When>
    <When Condition="'$(GitHeadSha)' == ''">
      <PropertyGroup>
        <GitHeadSha>Not found</GitHeadSha>
        <DotGitDir>$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory).git'))</DotGitDir>
        <HeadFileContent Condition="Exists('$(DotGitDir)/HEAD')">$([System.IO.File]::ReadAllText('$(DotGitDir)/HEAD').Trim())</HeadFileContent>
        <RefPath Condition="$(HeadFileContent.StartsWith('ref: '))">$(DotGitDir)/$(HeadFileContent.Substring(5))</RefPath>
        <GitHeadSha Condition="'$(RefPath)' != '' AND Exists('$(RefPath)')">$([System.IO.File]::ReadAllText('$(RefPath)').Trim())</GitHeadSha>
        <GitHeadSha Condition="'$(HeadFileContent)' != '' AND '$(RefPath)' == ''">$(HeadFileContent)</GitHeadSha>
      </PropertyGroup>
    </When>
    <Otherwise>
      <PropertyGroup>
        <GitHeadSha>Not found</GitHeadSha>
      </PropertyGroup>
    </Otherwise>
  </Choose>
</Project>

Directory.Build.targets

<Project>
  <PropertyGroup>
    <InformationalVersion>$(GitHeadSha)</InformationalVersion>
  </PropertyGroup>
</Project>