$ git clone -n https://src.fedoraproject.org/rpms/bsf.git /var/lib/mock/f41-build-side-1-2656022-28431/root/chroot_tmpdir/scmroot/bsf
Cloning into '/var/lib/mock/f41-build-side-1-2656022-28431/root/chroot_tmpdir/scmroot/bsf'...
$ git fetch origin 59de5f30539febc70b83ca3fb0aac13588d34549:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bsf
 * [new ref]         59de5f30539febc70b83ca3fb0aac13588d34549 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59de5f3 Convert to %autorelease and %autochangelog