libGit2Sharp “buddy build” leads to error when trying to access TFS

Issue:

When trying to use the Microsoft.TeamFoundation.Build.Activities.Git library I got the error

The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Analysis:

The detailed error message said it was looking for version 0.13.0.0 of libGit2Sharp.dll. I noticed that through Nuget I had installed 0.14.0.0. I uninstalled it and reinstalled the proper version using Nuget. However the error persisted. 

Given that this should work under TFS since it is used by the build system, I looked for, and found the version installed by TFS (at C:\Program Files\Microsoft Team Foundation Server 12.0\Tools).  By using ILSpy I discovered that although it has the same version ID (0.13.0.0), it is in fact different as it has a newer dependency on file git2-msvstfs.dll.

Apparently Microsoft had a “buddy build” of libGit2Sharp.dll added to TFS 2013 with the same version number, instead of using the official download at https://github.com/libgit2/libgit2sharp. I later found out what the differences are, and will report that in another post.

Resolution:

When doing operations against TFS repos you should use the version of libGit2Sharp.dll shipped with TFS (installed under C:\Program Files\Microsoft Team Foundation Server 12.0\Tools), as Microsoft did private changes but did not change the version number.

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