LibGit2Sharp.NameConflictException: Failed to write reference 'refs/heads/feature/Morpheus_v12.2': a reference with that name already exists.

[jwhite]

Sorry, I'm just starting to look at this but I have an exception that occurs only on 1 branch that we have. The rest are working.

This is in version 3.5.3 building on a TFS vNext agent.

`ERROR [05/18/16 11:44:42:43] An unexpected error occurred:

2016-05-17T23:44:42.4352442Z LibGit2Sharp.NameConflictException: Failed to write reference 'refs/heads/feature/Morpheus_v12.2': a reference with that name already exists.
 2016-05-17T23:44:42.4352442Z    at LibGit2Sharp.Core.Ensure.HandleError(Int32 result)
 2016-05-17T23:44:42.4352442Z    at LibGit2Sharp.Core.Ensure.ZeroResult(Int32 result)
 2016-05-17T23:44:42.4352442Z    at LibGit2Sharp.Core.Proxy.git_reference_create(RepositoryHandle repo, String name, ObjectId targetId, Boolean allowOverwrite, String logMessage)
2016-05-17T23:44:42.4352442Z    at LibGit2Sharp.ReferenceCollection.Add(String name, ObjectId targetId, String logMessage, Boolean allowOverwrite)
2016-05-17T23:44:42.4352442Z    at LibGit2Sharp.ReferenceCollection.Add(String name, ObjectId targetId)
2016-05-17T23:44:42.4352442Z    at GitTools.Git.GitRepositoryHelper.EnsureLocalBranchExistsForCurrentBranch(Repository repo, String currentBranch)
2016-05-17T23:44:42.4352442Z    at GitTools.Git.GitRepositoryHelper.NormalizeGitDirectory(String gitDirectory, AuthenticationInfo authentication, Boolean noFetch, String currentBranch)
2016-05-17T23:44:42.4352442Z    at GitVersion.GitPreparer.Initialise(Boolean normaliseGitDirectory, String currentBranch)
2016-05-17T23:44:42.4352442Z    at GitVersion.ExecuteCore.ExecuteInternal(String targetBranch, String commitId, IRepository repo, GitPreparer gitPreparer, String projectRoot, IBuildServer buildServer, Config overrideConfig)
2016-05-17T23:44:42.4352442Z    at GitVersion.ExecuteCore.ExecuteGitVersion(String targetUrl, String dynamicRepositoryLocation, Authentication authentication, String targetBranch, Boolean noFetch, String workingDirectory, String commitId, Config overrideConfig)
2016-05-17T23:44:42.4352442Z    at GitVersion.SpecifiedArgumentRunner.Run(Arguments arguments, IFileSystem fileSystem)
2016-05-17T23:44:42.4352442Z    at GitVersion.Program.VerifyArgumentsAndRun()
2016-05-17T23:44:42.4352442Z INFO [05/18/16 11:44:42:43] 
2016-05-17T23:44:42.4352442Z INFO [05/18/16 11:44:42:43] Here is the current git graph (please include in issue): 
2016-05-17T23:44:42.4352442Z INFO [05/18/16 11:44:42:43] Showing max of 100 commits
2016-05-17T23:44:43.3258635Z INFO [05/18/16 11:44:43:32] *   e1e8217 47 minutes ago  (HEAD, origin/Feature/Morpheus_v12.2)
2016-05-17T23:44:43.3258635Z |\  
2016-05-17T23:44:43.3258635Z | | * 497957a 58 minutes ago  (origin/pull/US751)
2016-05-17T23:44:43.3414884Z | | *   daf77dc 2 hours ago 
2016-05-17T23:44:43.3414884Z | | |\  
2016-05-17T23:44:43.3414884Z | |_|/  
2016-05-17T23:44:43.3414884Z |/| |   
2016-05-17T23:44:43.3414884Z * | |   4d340a3 2 hours ago 
2016-05-17T23:44:43.3414884Z |\ \ \  
2016-05-17T23:44:43.3414884Z | * \ \   f5d110e 21 hours ago  (Feature/Morpheus_v12.2)
2016-05-17T23:44:43.3414884Z | |\ \ \  
2016-05-17T23:44:43.3414884Z | | * \ \   7c614e2 2 days ago  (origin/pull/US968, pull/US968)
2016-05-17T23:44:43.3414884Z | | |\ \ \  
2016-05-17T23:44:43.3414884Z | | * | | | 4b6cb49 2 days ago 
2016-05-17T23:44:43.3414884Z * | | | | | 8858504 2 hours ago 
2016-05-17T23:44:43.3414884Z |/ / / / /  
2016-05-17T23:44:43.3414884Z | | | | * 853b994 2 hours ago 
2016-05-17T23:44:43.3414884Z | | | | * 5245501 21 hours ago 
2016-05-17T23:44:43.3414884Z | |_|_|/  
2016-05-17T23:44:43.3414884Z |/| | |   
2016-05-17T23:44:43.3414884Z * | | |   0ca06fd 22 hours ago 
2016-05-17T23:44:43.3414884Z |\ \ \ \  
2016-05-17T23:44:43.3414884Z | |_|/ /  
2016-05-17T23:44:43.3414884Z |/| | |   
2016-05-17T23:44:43.3414884Z | | | | *   32923d9 3 hours ago  (origin/Feature/VRecalls)
2016-05-17T23:44:43.3414884Z | | | | |\  
2016-05-17T23:44:43.3414884Z | | | | |/  
2016-05-17T23:44:43.3571133Z | | | |/|   
2016-05-17T23:44:43.3571133Z | | | * |   7aa63d9 3 hours ago  (origin/master, master)
2016-05-17T23:44:43.3571133Z | | | |\ \  
2016-05-17T23:44:43.3571133Z | | | | * | 027a9e5 3 hours ago 
2016-05-17T23:44:43.3571133Z | | | |/ /  
2016-05-17T23:44:43.3571133Z | | | * |   9625f39 4 hours ago 
2016-05-17T23:44:43.3571133Z | | | |\ \  
2016-05-17T23:44:43.3571133Z | | | | * | 2da01c4 4 hours ago 
2016-05-17T23:44:43.3571133Z | | | * | |   3e808dc 19 hours ago 
2016-05-17T23:44:43.3571133Z | | | |\ \ \  
2016-05-17T23:44:43.3571133Z | | | | * | | a87dd32 20 hours ago 
2016-05-17T23:44:43.3571133Z | | | | * | |   279f6cf 20 hours ago 
2016-05-17T23:44:43.3571133Z | | | | |\ \ \  
2016-05-17T23:44:43.3571133Z | | | | | * | | 1eb4bd6 20 hours ago 
2016-05-17T23:44:43.3571133Z | | |_|_|/ / /  
2016-05-17T23:44:43.3571133Z | |/| | | | |   
2016-05-17T23:44:43.3571133Z | | | | * | | 4b846e7 20 hours ago 
2016-05-17T23:44:43.3571133Z | | |_|/ / /  
2016-05-17T23:44:43.3571133Z | |/| | | |   
2016-05-17T23:44:43.3571133Z | | | * | |   36918e5 20 hours ago 
2016-05-17T23:44:43.3571133Z | | | |\ \ \  
2016-05-17T23:44:43.3571133Z | | |/ / / /  
2016-05-17T23:44:43.3571133Z | |/| | | |   
2016-05-17T23:44:43.3571133Z | | | * | | 01e3c52 21 hours ago 
2016-05-17T23:44:43.3571133Z | | |/ / /  
2016-05-17T23:44:43.3571133Z | |/| | |   
2016-05-17T23:44:43.3571133Z | | | | *   9cc356b 21 hours ago  (Feature/VRecalls)
2016-05-17T23:44:43.3571133Z | | | | |\  
2016-05-17T23:44:43.3571133Z | | | | | * de88a2a 21 hours ago 
2016-05-17T23:44:43.3571133Z | | | | | *   4ad26d2 21 hours ago 
2016-05-17T23:44:43.3571133Z | | | | | |\  
2016-05-17T23:44:43.3571133Z | | | | | | *   dfb8e2a 22 hours ago 
2016-05-17T23:44:43.3571133Z | | | | | | |\  
2016-05-17T23:44:43.3571133Z | | |_|_|_|_|/  
2016-05-17T23:44:43.3571133Z | |/| | | | |   
2016-05-17T23:44:43.3571133Z | * | | | | |   726e6cb 24 hours ago 
2016-05-17T23:44:43.3571133Z | |\ \ \ \ \ \  
2016-05-17T23:44:43.3571133Z | | * | | | | | 5856f76 25 hours ago  (origin/pull/M49638, pull/M49638)
2016-05-17T23:44:43.3727382Z | | * | | | | | c9f186c 2 days ago 
2016-05-17T23:44:43.3727382Z | * | | | | | |   53a095b 24 hours ago 
2016-05-17T23:44:43.3727382Z | |\ \ \ \ \ \ \  
2016-05-17T23:44:43.3727382Z | | * | | | | | | a71dff4 2 days ago  (origin/pull/lightinstaller, pull/lightinstaller)
2016-05-17T23:44:43.3727382Z | | * | | | | | | 14b9c79 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | 11e2e91 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | 78c956a 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | cae8e9d 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | 7f08e37 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | 3c3d76a 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | a4ffa79 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | d6d5d4b 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | be6aef8 2 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | 3c16f81 5 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | c4a47f8 5 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | 0d1e995 5 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | bbcc78c 5 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | | 53680e0 5 days ago 
2016-05-17T23:44:43.3727382Z | | * | | | | | |   e5cdff6 6 days ago 
2016-05-17T23:44:43.3727382Z | | |\ \ \ \ \ \ \  
2016-05-17T23:44:43.3727382Z | | | | |/ / / / /  
2016-05-17T23:44:43.3727382Z | | | |/| | | | |   
2016-05-17T23:44:43.3727382Z | | * | | | | | | 47c468d 6 days ago 
2016-05-17T23:44:43.3727382Z | * | | | | | | |   e5850f1 25 hours ago 
2016-05-17T23:44:43.3727382Z | |\ \ \ \ \ \ \ \  
2016-05-17T23:44:43.3727382Z | | |_|_|_|/ / / /  
2016-05-17T23:44:43.3727382Z | |/| | | | | | |   
2016-05-17T23:44:43.3727382Z | * | | | | | | |   c2eb9ac 26 hours ago 
2016-05-17T23:44:43.3727382Z | |\ \ \ \ \ \ \ \  
2016-05-17T23:44:43.3727382Z | | * \ \ \ \ \ \ \   628b35b 2 days ago  (origin/pull/M49556, pull/M49556)
2016-05-17T23:44:43.3727382Z | | |\ \ \ \ \ \ \ \  
2016-05-17T23:44:43.3727382Z | | |/ / / / / / / /  
2016-05-17T23:44:43.3727382Z | |/| | | | | | | |   
2016-05-17T23:44:43.3727382Z | | * | | | | | | | df15870 6 weeks ago  (origin/M49556, M49556)
2016-05-17T23:44:43.3727382Z | | | | | | | | * |   892a7c0 23 hours ago 
2016-05-17T23:44:43.3727382Z | | | | | | | | |\ \  
2016-05-17T23:44:43.3727382Z | | | | | | | | | |/  
2016-05-17T23:44:43.3727382Z | | | | | | | | * |   a119604 25 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | |\ \  
2016-05-17T23:44:43.3883631Z | | | | | | | | * | | 392e639 25 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | * | | | 602ab82 21 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | |_|/  
2016-05-17T23:44:43.3883631Z | | | | | | | |/| |   
2016-05-17T23:44:43.3883631Z | | | | | | | * | |   d31cda9 24 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | |\ \ \  
2016-05-17T23:44:43.3883631Z | | | | | | | | * \ \   6565e63 24 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | |\ \ \  
2016-05-17T23:44:43.3883631Z | | | | | | | | | * \ \   b6e60fc 2 days ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | | |\ \ \  
2016-05-17T23:44:43.3883631Z | | |_|_|_|_|_|_|_|/ / /  
2016-05-17T23:44:43.3883631Z | |/| | | | | | | | | |   
2016-05-17T23:44:43.3883631Z | * | | | | | | | | | |   04518f5 2 days ago  (origin/Feature/MedicalHistoryFix, origin/Feature/M47228-DAFAlerts, Feature/MedicalHistoryFix, Feature/M47228-DAFAlerts)
2016-05-17T23:44:43.3883631Z | |\ \ \ \ \ \ \ \ \ \ \  
2016-05-17T23:44:43.3883631Z | * \ \ \ \ \ \ \ \ \ \ \   24a1fc5 2 days ago 
2016-05-17T23:44:43.3883631Z | |\ \ \ \ \ \ \ \ \ \ \ \  
2016-05-17T23:44:43.3883631Z | | |_|_|_|_|_|/ / / / / /  
2016-05-17T23:44:43.3883631Z | |/| | | | | | | | | | |   
2016-05-17T23:44:43.3883631Z | | | | | | | | | | * | | 1d0ce6c 2 days ago 
2016-05-17T23:44:43.3883631Z | | |_|_|_|_|_|_|_|/ / /  
2016-05-17T23:44:43.3883631Z | |/| | | | | | | | | |   
2016-05-17T23:44:43.3883631Z | | | | | | | | * | | | 9cdedf7 24 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | |/ / /  
2016-05-17T23:44:43.3883631Z | | | | | | | | * | | 9a185e6 24 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | | |/  
2016-05-17T23:44:43.3883631Z | | | | | | | | |/|   
2016-05-17T23:44:43.3883631Z | | | | | | | | * | 874d120 25 hours ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | * | 4d72ce0 2 days ago 
2016-05-17T23:44:43.3883631Z | | | | | | | | |/  
2016-05-17T23:44:43.3883631Z | | | | | | | | * 4f445a3 2 days ago 
2016-05-17T23:44:43.3883631Z | | |_|_|_|_|_|/  
2016-05-17T23:44:43.3883631Z | |/| | | | | |   
2016-05-17T23:44:43.3883631Z | | | | | | | | * 2289d18 20 hours ago  (origin/pull/TFS-949, pull/TFS-949)
2016-05-17T23:44:43.3883631Z | |_|_|_|_|_|_|/  
2016-05-17T23:44:43.3883631Z |/| | | | | | |   
2016-05-17T23:44:43.3883631Z * | | | | | | |   94f3b17 2 days ago 
2016-05-17T23:44:43.4039880Z |\ \ \ \ \ \ \ \  
2016-05-17T23:44:43.4039880Z | * | | | | | | | 2412edc 5 days ago  (origin/pull/US962, pull/US962)
2016-05-17T23:44:43.4039880Z | | |_|_|_|_|_|/  
2016-05-17T23:44:43.4039880Z | |/| | | | | |   
2016-05-17T23:44:43.4039880Z * | | | | | | |   48ae8c6 2 days ago 
2016-05-17T23:44:43.4039880Z |\ \ \ \ \ \ \ \  
2016-05-17T23:44:43.4039880Z | |/ / / / / / /  
2016-05-17T23:44:43.4039880Z |/| | | | | | |   

2016-05-17T23:44:43.4039880Z | * | | | | | | fdc04f5 2 days ago  (origin/pull/US966, pull/US966)
 <snip>

[jwhite]

This occurs sporadically on build agents using build vNext. Logging into to the agent locally and running c:\tasks\GitVersion\3.5.3\GitVersion.exe /output buildserver /nofetch (the same command as reported in the log) has some strange behavior.

It takes a very long time and then eventually succeeds.

Could this have anything to do with the %tmp% file?

[JakeGinnivan]

From the looks of it its a case sensitivity issue.

refs/heads/feature/Morpheus_v12.2 vs (Feature/Morpheus_v12.2)

That would be my first guess. Possibly https://github.com/GitTools/GitTools.Core/blob/master/src/GitTools.Core/GitTools.Core.Shared/Git/Helpers/GitRepositoryHelper.cs#L120 needs to be a case insensitive check.

[GitHubSachin]

What is the resolution here? I am seeing same error on one of my branch

[drub0y]

So we just ran into this as well and it's because we had some history where we had someone use a capital F for a feature branch (i.e. Feature/whatever) in the past so when it goes through history and the first Feature/... it comes across is upper, but newer branches are lowercase (i.e. feature/...) it has already established the Feature/ virtual folder (if you will) as upper case. Obviously some of the code is treating things as case-insensitive, while other code is treating it as case-sensitive (i.e. _Equals_ vs _Equals(..., StringComparisonOptions.OridinalIgnoreCase)) and so you end up with this disagreement in the two different parts of the code.

Judging by the stack trace, it looks to me like this is a bug in Lib2GitSharp though, not GitVersion, right?

[rsc-bot]

I am receiving this error with TeamCity now.

[JackGrinningCat]

I got the same.
This was the first google hit and the comments are fitting with my history.

I made a big Story/... instead of story/...
Deleted the old Story/... and recreated the branch as story/...

The error occurred after an PullRequest in TFS. The build failed at git version. My error looks the same as above, without the git log, that's failing too, because the team don't have git in the path 😅 .

I'll recheck on that with our dev-team. I requested a Build again, which successfully handled this case.
May be there is an old build folder from my first story trial, that is related to the first story.

@drub0y Maybe it is a problem from Lib2GitSharp. But maybe it is the use or a missing parameters of it.

[FrankPeach]

I'm having the problem too. Any solution yet?

[Ivan-L]

Ditto, we're also hitting the same issue - someone created a Feature/ branch in our repo and now subsequent builds from feature/ branches are failing. Is there any way around this?

[jrestall]

+1

As mentioned above the issue seems to be with the code at
https://github.com/GitTools/GitTools.Core/blob/master/src/GitTools.Core/Git/Helpers/GitRepositoryHelper.cs#L155

2018-06-08T01:23:04.6228083Z ERROR [06/08/18 13:23:04:62] An unexpected error occurred:
2018-06-08T01:23:04.6228083Z LibGit2Sharp.NameConflictException: Failed to write reference 'refs/heads/feature/Config/Add_Config': a reference with that name already exists.
2018-06-08T01:23:04.6228083Z at LibGit2Sharp.Core.Ensure.HandleError(Int32 result)
2018-06-08T01:23:04.6228083Z at LibGit2Sharp.Core.Ensure.ZeroResult(Int32 result)
2018-06-08T01:23:04.6228083Z at LibGit2Sharp.Core.Proxy.git_reference_create(RepositoryHandle repo, String name, ObjectId targetId, Boolean allowOverwrite, String logMessage)
2018-06-08T01:23:04.6228083Z at LibGit2Sharp.ReferenceCollection.Add(String name, ObjectId targetId, String logMessage, Boolean allowOverwrite)
2018-06-08T01:23:04.6228083Z at LibGit2Sharp.ReferenceCollection.Add(String name, ObjectId targetId)
2018-06-08T01:23:04.6228083Z at GitTools.Git.GitRepositoryHelper.EnsureLocalBranchExistsForCurrentBranch(Repository repo, String currentBranch)
2018-06-08T01:23:04.6228083Z at GitTools.Git.GitRepositoryHelper.NormalizeGitDirectory(String gitDirectory, AuthenticationInfo authentication, Boolean noFetch, String currentBranch)
2018-06-08T01:23:04.6228083Z at GitVersion.GitPreparer.Initialise(Boolean normaliseGitDirectory, String currentBranch)
2018-06-08T01:23:04.6228083Z at GitVersion.ExecuteCore.ExecuteInternal(String targetBranch, String commitId, IRepository repo, GitPreparer gitPreparer, String projectRoot, IBuildServer buildServer, Config overrideConfig)
2018-06-08T01:23:04.6228083Z at GitVersion.ExecuteCore.ExecuteGitVersion(String targetUrl, String dynamicRepositoryLocation, Authentication authentication, String targetBranch, Boolean noFetch, String workingDirectory, String commitId, Config overrideConfig)
2018-06-08T01:23:04.6228083Z at GitVersion.SpecifiedArgumentRunner.Run(Arguments arguments, IFileSystem fileSystem)
2018-06-08T01:23:04.6228083Z at GitVersion.Program.VerifyArgumentsAndRun()

[asbjornu]

As GitVersion stopped using GitTools.Core in #1581 and after upgrading to LibGit2Sharp 0.26 in #1713, I'm not sure this problem still exists. Can you please try the latest build of GitVersion and report back whether it fixes this problem or not? Please reopen this issue if the problem persists.