0.8 SSH git push "authorization failed"

[mcepl]

(originally dealt with as https://github.com/go-git/go-git/issues/489, but it is really a different bug, Cc: @MichaelMure , @pjbgf).

Original issue report was:

Just prepared a reproducer for my colleague:

This is my local git repo https://mcepl.fedorapeople.org/tmp/wikipediafs-repo.tar.xz, using https://github.com/MichaelMure/git-bug/releases/download/v0.8.0/git-bug_linux_amd64, and then when I run:

tumbleweed-pkg~/r/wikipediafs (master)$ /tmp/git-bug_linux_amd64 ls 
a1403a8	open	bytes/str mess when converted to Py3              	Matěj Cepl     	
d3b7005	open	proposal for improvement by mobiphil              	Matěj Cepl     	
tumbleweed-pkg~/r/wikipediafs (master)$ git remote -v
myrepo	https://git.cepl.eu/cgit/toys/wikipediafs (fetch)
myrepo	redcrew:/srv/git/toys/wikipediafs.git (push)
sourcehut	https://git.sr.ht/~mcepl/wikipediafs (fetch)
sourcehut	[email protected]:~mcepl/wikipediafs (push)
tumbleweed-pkg~/r/wikipediafs (master)$ /tmp/git-bug_linux_amd64 push sourcehut
Error: authorization failed
tumbleweed-pkg~/r/wikipediafs (master)$ 

(if you want R/W access to the sourcehut repo, let me know your sourcehut username, but I can reproduce exactly the same with https://git.cepl.eu/cgit/toys/wikipediafs/ where it is just openssh-server-5.3p1-124.el6_10.x86_64 and git-1.7.1-10.el6_10.x86_64 on an ancient CentOS 6).

Obviously, git push --all sourcehut works perfectly.

---

Then, @pjbgf suspected that I was using outdated go-git version. So, this is the result:

I will look into rebuilding git-bug with revendored dependencies later, but just to note that the reproduction I showed here (and sorry about the formatting, GitHub cannot parse Markdown from emails) was against Sourcehut and I don't think they use obsolete software there (they may use libgit2, or something else than the canonical git binary).

and

When including this commit on the top of the current master, I get this binary for Linux/x86_64. With that I get exactly the same problem:

tumbleweed-pkg~/r/wikipediafs (master)$ git remote -v
myrepo	https://git.cepl.eu/cgit/toys/wikipediafs (fetch)
myrepo	redcrew:/srv/git/toys/wikipediafs.git (push)
sourcehut	https://git.sr.ht/~mcepl/wikipediafs (fetch)
sourcehut	[email protected]:~mcepl/wikipediafs (push)
tumbleweed-pkg~/r/wikipediafs (master)$ git bug push sourcehut 
Error: authorization failed
tumbleweed-pkg~/r/wikipediafs (master)$ 

(again, trying to push to Sourcehut to eliminate any possible problems with obsolete versions of software on my server)

@MichaelMure, is it possible to get some kind of debugging or verbose information?

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Also echo '0009done' | ssh [email protected] git-upload-pack /~mcepl/wikipediafs reports agent=git/2.43.4.