On Sat, Oct 19, 2024 at 7:31 PM fox [off-list ref] wrote:

What did you do before the bug happened? (Steps to reproduce your issue)
1. Run git clone https://www.townlong-yak.com/test.git
Cloning into 'test'...
error: files '/Users/me/test/.git/objects/pack/tmp_idx_WT81vv' and '/Users/me/test/.git/objects/pack/pack-427331d91391b00844273eeb3879cb479ce2c995.idx' differ in contents
fatal: unable to rename temporary '*.idx' file to '/Users/me/test/.git/objects/pack/pack-427331d91391b00844273eeb3879cb479ce2c995.idx'
error: Unable to find 6261a9d9f7704c02a5421ff733919ab18793aa7d under https://www.townlong-yak.com/test.git
Cannot obtain needed object 6261a9d9f7704c02a5421ff733919ab18793aa7d
error: fetch failed.

I can reproduce this problem.

Running git-bisect identifies b1b8dfde6929ec9463eca0a858c4adb9786d7c93 as the first bad commit,
suggesting that the .idx file downloaded from the remote is now expected to be byte-for-byte
identical with a locally-generated version; due to format differences, they are not.

Cc:'ing the authors of that commit.