$ git clone -n https://src.fedoraproject.org/rpms/astrometry.git /var/lib/mock/f41-build-847945-164378/root/chroot_tmpdir/scmroot/astrometry
Cloning into '/var/lib/mock/f41-build-847945-164378/root/chroot_tmpdir/scmroot/astrometry'...
$ git fetch origin 8737e02193f4007409a7ca8fed7dd48203d439bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/astrometry
 * [new ref]         8737e02193f4007409a7ca8fed7dd48203d439bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8737e02 Disable i686 build and consolidate data files