Builds now include the git commit ID in the PE file header so we have a definite record of where a build came from.

1 files changed, 34 insertions, 0 deletions

diff --git a/src/DotNetOpenAuth.BuildTasks/GetBuildVersion.cs b/src/DotNetOpenAuth.BuildTasks/GetBuildVersion.cs
index e40eb78..f046738 100644
--- a/src/DotNetOpenAuth.BuildTasks/GetBuildVersion.cs
+++ b/src/DotNetOpenAuth.BuildTasks/GetBuildVersion.cs
@@ -16,16 +16,29 @@ namespace DotNetOpenAuth.BuildTasks {
 		public string Version { get; private set; }
 
 		/// <summary>
+		/// Gets the Git revision control commit id for HEAD (the current source code version).
+		/// </summary>
+		[Output]
+		public string GitCommitId { get; private set; }
+
+		/// <summary>
 		/// The file that contains the version base (Major.Minor.Build) to use.
 		/// </summary>
 		[Required]
 		public string VersionFile { get; set; }
 
+		/// <summary>
+		/// Gets or sets the parent directory of the .git directory.
+		/// </summary>
+		public string GitRepoRoot { get; set; }
+
 		public override bool Execute() {
 			try {
 				Version typedVersion = ReadVersionFromFile();
 				typedVersion = new Version(typedVersion.Major, typedVersion.Minor, typedVersion.Build, CalculateJDate(DateTime.Now));
 				Version = typedVersion.ToString();
+
+				this.GitCommitId = GetGitHeadCommitId();
 			} catch (ArgumentOutOfRangeException ex) {
 				Log.LogErrorFromException(ex);
 				return false;
@@ -34,6 +47,27 @@ namespace DotNetOpenAuth.BuildTasks {
 			return true;
 		}
 
+		private string GetGitHeadCommitId() {
+			if (string.IsNullOrEmpty(this.GitRepoRoot)) {
+				return string.Empty;
+			}
+
+			string headContent = string.Empty;
+			try {
+				headContent = File.ReadAllText(Path.Combine(this.GitRepoRoot, @".git/HEAD")).Trim();
+				if (headContent.StartsWith("ref:", StringComparison.Ordinal)) {
+					string refName = headContent.Substring(5).Trim();
+					headContent = File.ReadAllText(Path.Combine(this.GitRepoRoot, @".git/" + refName)).Trim();
+				}
+			} catch (FileNotFoundException) { }
+
+			if (string.IsNullOrEmpty(headContent)) {
+				Log.LogWarning("Unable to determine the git HEAD commit ID to use for informational version number.");
+			}
+
+			return headContent.Trim();
+		}
+
 		private Version ReadVersionFromFile() {
 			string[] lines = File.ReadAllLines(VersionFile);
 			string versionLine = lines[0];