Git.cake

public static class Git
{
	public static readonly string Username = Environment.GetEnvironmentVariable("GIT_USERNAME");
	public static readonly string Password = Environment.GetEnvironmentVariable("GIT_PASSWORD");

	public static string Execute(string arguments)
	{
		var process = System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo
		{
			FileName = "git",
			Arguments = arguments,
			UseShellExecute = false,
			RedirectStandardOutput = true,
			CreateNoWindow = true
		});

		return process.StandardOutput.ReadToEnd().Trim();
	}

	public static string CurrentBranch()
	{
		return Execute("rev-parse --abbrev-ref HEAD");
	}

	public static string GetOriginUri()
	{
		return Execute("config --get remote.origin.url");
	}

	public static string GetOriginUriWithoutSuffix()
	{
		var uri = GetOriginUri();

		var index = uri.LastIndexOf(".git");
		if (index >= 0)
			uri = uri.Remove(index);

		return uri;
	}
}

public static bool IsMaster(this string branch)
{
	return branch.Equals("master", StringComparison.OrdinalIgnoreCase);
}

Task("git-tag-build")
	.WithCriteria(!BuildSystem.IsLocalBuild) // Only during CI/CD
	.Does(() =>
	{
		Information("Adding tag to git repo ...");
		if (string.IsNullOrWhiteSpace(Git.Username))
		{
			Information($"Git username was not found, tag could not be created.");
		}
		else if (string.IsNullOrWhiteSpace(Git.Password))
		{
			Information($"Git password was not found, tag could not be created.");
		}
		else
		{
			Information(Git.Execute($"tag {Build.Version}"));

			var origin = new Uri(Git.GetOriginUri());
			var username = System.Net.WebUtility.UrlEncode(Git.Username);
			var password = System.Net.WebUtility.UrlEncode(Git.Password);
			var uri = $"http://{username}:{password}@{origin.Host}{origin.PathAndQuery}";

			Information($"Pushing tag '{Build.Version}' to '{origin}' ...");
			Information(Git.Execute($"push {uri} {Build.Version}"));
		}
	});