$ git clone -n https://src.fedoraproject.org/rpms/mbuffer.git /var/lib/mock/f41-build-side-1-2873921-34403/root/chroot_tmpdir/scmroot/mbuffer
Cloning into '/var/lib/mock/f41-build-side-1-2873921-34403/root/chroot_tmpdir/scmroot/mbuffer'...
$ git fetch origin 643ebe5bbdde0e42ca420f75f1a8051bc4ba5661:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mbuffer
 * [new ref]         643ebe5bbdde0e42ca420f75f1a8051bc4ba5661 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 643ebe5 - Update to 20240929 fixes rhbz#2315585