$ git clone -n https://src.fedoraproject.org/rpms/kstars.git /var/lib/mock/f42-build-866177-173788/root/chroot_tmpdir/scmroot/kstars
Cloning into '/var/lib/mock/f42-build-866177-173788/root/chroot_tmpdir/scmroot/kstars'...
$ git fetch origin 3df0521dc843f58fd32d6c51d1e318ce0901d12c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kstars
 * [new ref]         3df0521dc843f58fd32d6c51d1e318ce0901d12c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3df0521 Drop i686 builds