libgit2 / libgit2/pygit2

clone / fetch operations are extremely slow on gitlab cloud repos

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Dominant language
Python
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Description

Reproduces on pygit2 1.17.0/1.18.0 / python 3.11 on Mac / Linux:

import pygit2
pygit2.clone_repository("https://gitlab.com/antora/antora", "/tmp/antora")

Takes more than 10 minutes, while the cli equivalent:

git clone https://gitlab.com/antora/antora /tmp/antora 

Takes a few seconds.
Started happening ~10 days ago in our production env, worked well before and still works well for github and bitbucket hosted repos (moving the problematic repos to github solves it).
Started happening out of no where - we didn't deploy or made any change in our environment.

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Research direction

Start with the pygit2.clone_repository call shown in the report and compare its behavior with the git CLI for the GitLab repository. Reproduce on pygit2 1.17.0 and 1.18.0 with Python 3.11, then investigate why GitLab clones are slow while GitHub and Bitbucket clones are not. Done means clone and fetch complete in a time comparable to the CLI.

Written by the indexing model from the issue text.

Assessment

Tech stack
git, gitlab, python
Domain
devtools, networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
42/100

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