$ git clone -n https://src.fedoraproject.org/rpms/byteman.git /var/lib/mock/f41-build-1465500-23647/root/chroot_tmpdir/scmroot/byteman
Cloning into '/var/lib/mock/f41-build-1465500-23647/root/chroot_tmpdir/scmroot/byteman'...
$ git fetch origin 2e38dd3794aede8ad6919bb28886822f9e522d5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/byteman
 * [new ref]         2e38dd3794aede8ad6919bb28886822f9e522d5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e38dd3 Eliminate use of obsolete %patchN syntax (#2283636)