$ git clone -n https://src.fedoraproject.org/rpms/asymptote.git /var/lib/mock/f42-build-side-1-3589250-46955/root/chroot_tmpdir/scmroot/asymptote
Cloning into '/var/lib/mock/f42-build-side-1-3589250-46955/root/chroot_tmpdir/scmroot/asymptote'...
$ git fetch origin 6449040ae926ab89e028046c75762dd20789ab84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/asymptote
 * [new ref]         6449040ae926ab89e028046c75762dd20789ab84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6449040 3.01