$ git clone -n https://src.fedoraproject.org/rpms/kstars.git /var/lib/mock/f42-build-3409136-45146/root/chroot_tmpdir/scmroot/kstars
Cloning into '/var/lib/mock/f42-build-3409136-45146/root/chroot_tmpdir/scmroot/kstars'...
$ git fetch origin 3b6a3aeb6ec8adfd0b4713b35c2ffa2a74215c7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kstars
 * [new ref]         3b6a3aeb6ec8adfd0b4713b35c2ffa2a74215c7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b6a3ae 3.7.5