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From: Nick Owens <mischief@offblast.org>
Date: Wed, 28 Nov 2018 12:25:09 -0800
Message-ID: <CAH_zEu7R-htQZEGCH42AEs0VSCA5abM=rhMp-RXDQsFUU1nysQ@mail.gmail.com>
Subject: bug: hg pull fails on a bitbucket repo
To: 9front@9front.org
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X-Bullshit: full-stack table event injection framework 

our hg (which i think is about version 1.4) will fail to pull some
bitbucket hg repos.

cpu% ramfs
cpu% cd /tmp
cpu% hg clone -r tip https://bitbucket.org/oridb/mc
destination directory: mc
requesting all changes
adding changesets
adding manifests
adding file changes
added 4988 changesets with 12508 changes to 1680 files
updating working directory
1090 files updated, 0 files merged, 0 files removed, 0 files unresolved
cpu% cd mc
cpu% hg pull
pulling from https://bitbucket.org/oridb/mc
searching for changes
abort: '/mnt/web/0/body' 400 Bad Request: /mnt/web/0/body
cpu%

hg is issuing a particular request where the resulting URI is over
4096 bytes, and the bitbucket server rejects this with a 400, and the
response body claims that this is because a line in the request is too
long (the URI). it's about 5200 bytes long in this instance.

in ports, there is mercurial 3.4.1
(https://code.9front.org/hg/ports/file/d0100ff1c37e/dev-vcs/mercurial/mkfile)
which does not have this problem. in newer hg, the wire protocol seems
quite different, but there's also a particular feature where hg can
send rpc arguments through split-up http headers rather than all
smushed into a URI.

there's a few options:

update the system hg to mercurial 3.4.1 (or whatever the latest
working copy is) and deal with the resulting fallout.
cherry-pick code from newer mercurial.
ignore the problem.

one caveat of updating to newer mercurial is that upstream dropped
python 2.5 support some years ago.

discuss.