libgit2 / libgit2/libgit2sharp
unexpected EOF when trying to fetch from remote
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Description
I'm having an issue with a remote repo hosted on a BitBucket v7.21.4. The clone command works just fine, but when I try to fetch a particular branch if fails with LibGit2Sharp.LibGit2SharpException: unexpected EOF.
The issue is constantly reproducible.
Reproduction steps
Example code:
using var repo = new Repository(repositoryPath);
var fetchOpts = new FetchOptions();
fetchOpts.CertificateCheck = (_,_,_) => true;
fetchOpts.CredentialsProvider = (_, _, _) => new UsernamePasswordCredentials() { Username = remoteUser, Password = remotePassword };
fetchOpts.Prune = true;
fetchOpts.TagFetchMode = TagFetchMode.None;
var remote = repo.Network.Remotes["origin"];
Commands.Fetch(repo, remote.Name, [$"+refs/heads/{remoteBranch}:refs/remotes/{remote.Name}/{remoteBranch}"], fetchOpts, null);
Expected behavior
Fetch to complete successfully.
Actual behavior
Unhandled exception. LibGit2Sharp.LibGit2SharpException: unexpected EOF
Below is the trace:
Debug: Sending POST request to https://<repourl>/scm/<proj>/<repo>.git/git-upload-pack
Trace: Sending request:
POST /scm/<proj>/<repo>.git/git-upload-pack HTTP/1.1
User-Agent: git/2.0 (libgit2 1.7.1)
Host: <host>
Accept: application/x-git-upload-pack-result
Content-Type: application/x-git-upload-pack-request
Content-Length: 1124
Authorization: Basic <auth>
Trace: Sending request:
0074want 3edd78a0fa98c3c2361088051ef762b8ae617a7c multi_ack_detailed side-band-64k include-tag thin-pack ofs-delta
00000032have 6bb975022c21ceb358e9686ec47f62f0df5ab76b
0032have 19339ffb0a1a4a31c1ed445155ff5a0819a90404
...
0032have 4fcfbe8283ab4d7df213d4aad49213e078579dd5
0000
Trace: Received:
Unhandled exception. LibGit2Sharp.LibGit2SharpException: unexpected EOF
Below is the the trace from the OS git client fetch from the same remote which works just fine:
$git fetch origin master
...
12:39:35.668070 pkt-line.c:80 packet: fetch> command=fetch
12:39:35.668091 pkt-line.c:80 packet: fetch> agent=git/2.39.2
12:39:35.668095 pkt-line.c:80 packet: fetch> 0001
12:39:35.668098 pkt-line.c:80 packet: fetch> thin-pack
12:39:35.668102 pkt-line.c:80 packet: fetch> ofs-delta
12:39:35.668108 pkt-line.c:80 packet: fetch> want 3edd78a0fa98c3c2361088051ef762b8ae617a7c
12:39:35.668119 pkt-line.c:80 packet: fetch> have 6bb975022c21ceb358e9686ec47f62f0df5ab76b
...
12:39:35.668678 pkt-line.c:80 packet: fetch> have 7bb74cc0c823352f64704ffcf72a1449d7fa355d
12:39:35.668683 pkt-line.c:80 packet: fetch> 0000
I noticed that it sends only thin-pack and ofs-delta arguments as opposed to multi_ack_detailed side-band-64k include-tag thin-pack ofs-delta from libgit2sharp.
Is there a way to control this behavior with code?
Version of LibGit2Sharp (release number or SHA1)
Libgit2sharp v0.29.0
Operating system(s) tested; .NET runtime tested
.NET SDK:
Version: 8.0.101
Commit: 6eceda187b
Workload version: 8.0.100-manifests.69afb982
Runtime Environment:
OS Name: Mac OS X
OS Version: 14.3
OS Platform: Darwin
RID: osx-x64
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at Commands.Fetch and FetchOptions, then trace how the fetch request advertises capabilities such as multi_ack_detailed, side-band-64k, and include-tag. Compare this with the working OS Git request and determine whether LibGit2Sharp exposes control over those options; done means identifying a supported configuration or a reproducible protocol incompatibility with Bitbucket 7.21.4.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp, git
- Domain
- devtools, networking
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100