Git In-Memory repository update target - libgit2

Question

I'm still fairly new to the whole libgit2 and libgit2sharp codebases, but I've been trying to tackle the issue of In-Memory repositories and Refdb storage of references.
I've gotten everything almost working in my new branch:
Create the In-Memory repository and attach Refdb and Odb instance to it.
Create initial commit and set the reference for refs/heads/master.
Create the second commit...
The problem I run into now is updating refs/heads/master to the second commit. The UpdateTarget call to refs/heads/master runs into an error in git_reference_set_target:
LibGit2Sharp.NameConflictException : config value 'user.name' was not found
at LibGit2Sharp.Core.Ensure.HandleError(Int32 result) in \libgit2sharp\LibGit2Sharp\Core\Ensure.cs:line 154
at LibGit2Sharp.Core.Ensure.ZeroResult(Int32 result) in \libgit2sharp\LibGit2Sharp\Core\Ensure.cs:line 172
at LibGit2Sharp.Core.Proxy.git_reference_set_target(ReferenceHandle reference, ObjectId id, String logMessage) in \libgit2sharp\LibGit2Sharp\Core\Proxy.cs:line 2042
at LibGit2Sharp.ReferenceCollection.UpdateDirectReferenceTarget(Reference directRef, ObjectId targetId, String logMessage) in \libgit2sharp\LibGit2Sharp\ReferenceCollection.cs:line 476
at LibGit2Sharp.ReferenceCollection.UpdateTarget(Reference directRef, ObjectId targetId, String logMessage) in \libgit2sharp\LibGit2Sharp\ReferenceCollection.cs:line 470
at LibGit2Sharp.ReferenceCollection.UpdateTarget(Reference directRef, String objectish, String logMessage) in \libgit2sharp\LibGit2Sharp\ReferenceCollection.cs:line 498
at LibGit2Sharp.ReferenceCollection.UpdateTarget(String name, String canonicalRefNameOrObjectish, String logMessage) in \libgit2sharp\LibGit2Sharp\ReferenceCollection.cs:line 534
at LibGit2Sharp.ReferenceCollection.UpdateTarget(String name, String canonicalRefNameOrObjectish) in \libgit2sharp\LibGit2Sharp\ReferenceCollection.cs:line 565
at LibGit2Sharp.Tests.RepositoryFixture.CanCreateInMemoryRepositoryWithBackends() in \libgit2sharp\LibGit2Sharp.Tests\RepositoryFixture.cs:line 791
I have not been able to debug down into the libgit2 level, but from what I can tell the issue is in git_reference_create_matching call to git_reference__log_signature.
Is there a call I am missing that can update a reference in a Bare repo that doesn't require a signature? If any libgit2 guys know of how to do this in libgit2, I can implement it on the C# side.
As a test, I created two unit tests that perform the same actions In-Memory and on disk, and the In-Memory fails when calling UpdateTarget after creating the second commit. This follows the code on the wiki:
private Commit CreateCommit(Repository repository, string fileName, string content, string message = null)
{
if (message == null)
{
message = "i'm a commit message :)";
}
Blob newBlob = repository.ObjectDatabase.CreateBlobFromContent(content);
// Put the blob in a tree
TreeDefinition td = new TreeDefinition();
td.Add(fileName, newBlob, Mode.NonExecutableFile);
Tree tree = repository.ObjectDatabase.CreateTree(td);
// Committer and author
Signature committer = new Signature("Auser", "auser#example.com", DateTime.Now);
Signature author = committer;
// Create binary stream from the text
return repository.ObjectDatabase.CreateCommit(
author,
committer,
message,
tree,
repository.Commits,
true);
}
[Fact]
public void CanCreateRepositoryWithoutBackends()
{
SelfCleaningDirectory scd = BuildSelfCleaningDirectory();
Repository.Init(scd.RootedDirectoryPath, true);
ObjectId commit1Id;
using (var repository = new Repository(scd.RootedDirectoryPath))
{
Commit commit1 = CreateCommit(repository, "filePath.txt", "Hello commit 1!");
commit1Id = commit1.Id;
repository.Refs.Add("refs/heads/master", commit1.Id);
Assert.Equal(1, repository.Commits.Count());
Assert.NotNull(repository.Refs.Head);
Assert.Equal(1, repository.Refs.Count());
}
using (var repository = new Repository(scd.RootedDirectoryPath))
{
Commit commit2 = CreateCommit(repository, "filePath.txt", "Hello commit 2!");
Assert.Equal(commit1Id, commit2.Parents.First().Id);
repository.Refs.UpdateTarget("refs/heads/master", commit2.Sha);
Assert.Equal(2, repository.Commits.Count());
Assert.Equal(1, repository.Refs.Count());
Assert.NotNull(repository.Refs.Head);
Assert.Equal(commit2.Sha, repository.Refs.Head.ResolveToDirectReference().TargetIdentifier);
}
}
[Fact]
public void CanCreateInMemoryRepositoryWithBackends()
{
OdbBackendFixture.MockOdbBackend odbBackend = new OdbBackendFixture.MockOdbBackend();
RefdbBackendFixture.MockRefdbBackend refdbBackend = new RefdbBackendFixture.MockRefdbBackend();
ObjectId commit1Id;
using (var repository = new Repository())
{
repository.Refs.SetBackend(refdbBackend);
repository.ObjectDatabase.AddBackend(odbBackend, 5);
Commit commit1 = CreateCommit(repository, "filePath.txt", "Hello commit 1!");
commit1Id = commit1.Id;
repository.Refs.Add("refs/heads/master", commit1.Id);
Assert.Equal(1, repository.Commits.Count());
Assert.NotNull(repository.Refs.Head);
Assert.Equal(commit1.Sha, repository.Refs.Head.ResolveToDirectReference().TargetIdentifier);
// Emulating Git, repository.Refs enumerable does not include the HEAD.
// Thus, repository.Refs.Count will be 1 and refdbBackend.References.Count will be 2.
Assert.Equal(1, repository.Refs.Count());
Assert.Equal(2, refdbBackend.References.Count);
}
using (var repository = new Repository())
{
repository.Refs.SetBackend(refdbBackend);
repository.ObjectDatabase.AddBackend(odbBackend, 5);
Commit commit2 = CreateCommit(repository, "filePath.txt", "Hello commit 2!");
Assert.Equal(commit1Id, commit2.Parents.First().Id);
//repository.Refs.UpdateTarget(repository.Refs["refs/heads/master"], commit2.Id);
//var master = repository.Refs["refs/heads/master"];
//Assert.Equal(commit1Id.Sha, master.TargetIdentifier);
repository.Refs.UpdateTarget("refs/heads/master", commit2.Sha); // fails at LibGit2Sharp.Core.Proxy.git_reference_set_target(ReferenceHandle reference, ObjectId id, String logMessage)
//repository.Refs.Add("refs/heads/master", commit2.Id); // fails at LibGit2Sharp.Core.Proxy.git_reference_create(RepositoryHandle repo, String name, ObjectId targetId, Boolean allowOverwrite, String logMessage)
Assert.Equal(2, repository.Commits.Count());
Assert.Equal(1, repository.Refs.Count());
Assert.NotNull(repository.Refs.Head);
Assert.Equal(commit2.Sha, repository.Refs.Head.ResolveToDirectReference().TargetIdentifier);
}
}