Merge pull request #554 from dotnet/fix553

Use git "commondir" for reference lookups

src/NerdBank.GitVersioning.Tests/VersionOracleTests.cs

@@ -417,8 +417,8 @@ public void VersionJsonWithSingleIntegerForVersion()
         this.Logger.WriteLine(ex.ToString());
     }
 
-    [Fact]
-    public void Worktree_Support()
+    [Theory, CombinatorialData]
+    public void Worktree_Support(bool detachedHead)
     {
         var workingCopyVersion = new VersionOptions
         {
@@ -431,10 +431,22 @@ public void Worktree_Support()
 
         string workTreePath = this.CreateDirectoryForNewRepo();
         Directory.Delete(workTreePath);
-        this.LibGit2Repository.Worktrees.Add("HEAD~1", "myworktree", workTreePath, isLocked: false);
+        if (detachedHead)
+        {
+            this.LibGit2Repository.Worktrees.Add("HEAD~1", "myworktree", workTreePath, isLocked: false);
+        }
+        else
+        {
+            this.LibGit2Repository.Branches.Add("wtbranch", "HEAD~1");
+            this.LibGit2Repository.Worktrees.Add("wtbranch", "myworktree", workTreePath, isLocked: false);
+        }
+
         var context = this.CreateGitContext(workTreePath);
         var oracleWorkTree = new VersionOracle(context);
         Assert.Equal(oracleOriginal.Version, oracleWorkTree.Version);
+
+        Assert.True(context.TrySelectCommit("HEAD"));
+        Assert.True(context.TrySelectCommit(this.LibGit2Repository.Head.Tip.Sha));
     }
 
     [Fact]

src/NerdBank.GitVersioning/ManagedGit/GitRepository.cs

@@ -33,9 +33,7 @@ public class GitRepository : IDisposable
         /// <summary>
         /// Creates a new instance of the <see cref="GitRepository"/> class.
         /// </summary>
-        /// <param name="workingDirectory">
-        /// The current working directory. This can be a subdirectory of the Git repository.
-        /// </param>
+        /// <param name="workingDirectory"><inheritdoc cref="GitRepository(string, string, string, string)" path="/param[@name='workingDirectory']" /></param>
         /// <returns>
         /// A <see cref="GitRepository"/> which represents the git repository, or <see langword="null"/>
         /// if no git repository was found.
@@ -93,18 +91,10 @@ public class GitRepository : IDisposable
         /// <summary>
         /// Creates a new instance of the <see cref="GitRepository"/> class.
         /// </summary>
-        /// <param name="workingDirectory">
-        /// The current working directory. This can be a subdirectory of the Git repository.
-        /// </param>
-        /// <param name="gitDirectory">
-        /// The directory in which git metadata (such as refs,...) is stored.
-        /// </param>
-        /// <param name="commonDirectory">
-        /// The common Git directory, in which Git objects are stored.
-        /// </param>
-        /// <param name="objectDirectory">
-        /// The object directory in which Git objects are stored.
-        /// </param>
+        /// <param name="workingDirectory"><inheritdoc cref="GitRepository(string, string, string, string)" path="/param[@name='workingDirectory']" /></param>
+        /// <param name="gitDirectory"><inheritdoc cref="GitRepository(string, string, string, string)" path="/param[@name='gitDirectory']" /> </param>
+        /// <param name="commonDirectory"><inheritdoc cref="GitRepository(string, string, string, string)" path="/param[@name='commonDirectory']" /></param>
+        /// <param name="objectDirectory"><inheritdoc cref="GitRepository(string, string, string, string)" path="/param[@name='objectDirectory']" /></param>
         public static GitRepository Create(string workingDirectory, string gitDirectory, string commonDirectory, string objectDirectory)
         {
             return new GitRepository(workingDirectory, gitDirectory, commonDirectory, objectDirectory);
@@ -117,10 +107,10 @@ public static GitRepository Create(string workingDirectory, string gitDirectory,
         /// The current working directory. This can be a subdirectory of the Git repository.
         /// </param>
         /// <param name="gitDirectory">
-        /// The directory in which git metadata (such as refs,...) is stored.
+        /// The directory in which the git HEAD file is stored. This is the .git directory unless the working directory is a worktree.
         /// </param>
         /// <param name="commonDirectory">
-        /// The common Git directory, in which Git objects are stored.
+        /// The common Git directory, which is parent to the objects, refs, and other directories.
         /// </param>
         /// <param name="objectDirectory">
         /// The object directory in which Git objects are stored.
@@ -191,7 +181,8 @@ public GitRepository(string workingDirectory, string gitDirectory, string common
         public string WorkingDirectory { get; private set; }
 
         /// <summary>
-        /// Gets the path to the Git directory, in which metadata (e.g. references and configuration) is stored.
+        /// Gets the path to the Git directory, in which at minimum HEAD is stored.
+        /// Use <see cref="CommonDirectory"/> for all other metadata (e.g. references, configuration).
         /// </summary>
         public string GitDirectory { get; private set; }
 
@@ -333,9 +324,9 @@ public GitCommit GetCommit(GitObjectId sha, bool readAuthor = false)
             else
             {
                 // Look for simple names for branch or tag.
-                possibleLooseFileMatches.Add(Path.Combine(this.GitDirectory, "refs", "heads", objectish));
-                possibleLooseFileMatches.Add(Path.Combine(this.GitDirectory, "refs", "tags", objectish));
-                possibleLooseFileMatches.Add(Path.Combine(this.GitDirectory, "refs", "remotes", objectish));
+                possibleLooseFileMatches.Add(Path.Combine(this.CommonDirectory, "refs", "heads", objectish));
+                possibleLooseFileMatches.Add(Path.Combine(this.CommonDirectory, "refs", "tags", objectish));
+                possibleLooseFileMatches.Add(Path.Combine(this.CommonDirectory, "refs", "remotes", objectish));
             }
 
             if (possibleLooseFileMatches.FirstOrDefault(File.Exists) is string existingPath)
@@ -344,7 +335,7 @@ public GitCommit GetCommit(GitObjectId sha, bool readAuthor = false)
             }
 
             // Match in packed-refs file.
-            string packedRefPath = Path.Combine(this.GitDirectory, "packed-refs");
+            string packedRefPath = Path.Combine(this.CommonDirectory, "packed-refs");
             if (File.Exists(packedRefPath))
             {
                 using var refReader = File.OpenText(packedRefPath);
@@ -653,7 +644,7 @@ private GitObjectId ResolveReference(object reference)
         {
             if (reference is string)
             {
-                if (!FileHelpers.TryOpen(Path.Combine(this.GitDirectory, (string)reference), out FileStream? stream))
+                if (!FileHelpers.TryOpen(Path.Combine(this.CommonDirectory, (string)reference), out FileStream? stream))
                 {
                     return GitObjectId.Empty;
                 }