$ git clone -n https://src.fedoraproject.org/rpms/bzip3.git /var/lib/mock/f39-build-2216485-52497/root/chroot_tmpdir/scmroot/bzip3
Cloning into '/var/lib/mock/f39-build-2216485-52497/root/chroot_tmpdir/scmroot/bzip3'...
$ git fetch origin 8e00e8cdf1046196451fdc005da13b87b2dec4e0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bzip3
 * [new ref]         8e00e8cdf1046196451fdc005da13b87b2dec4e0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e00e8c 1.4.0 bump