$ git clone -n https://src.fedoraproject.org/rpms/rkward.git /var/lib/mock/f42-build-3530730-46321/root/chroot_tmpdir/scmroot/rkward
Cloning into '/var/lib/mock/f42-build-3530730-46321/root/chroot_tmpdir/scmroot/rkward'...
$ git fetch origin ed1b7f9c4333759ed7bd4fac6ffab244b9e3f9b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rkward
 * [new ref]         ed1b7f9c4333759ed7bd4fac6ffab244b9e3f9b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed1b7f9 Update to prerelease version (rhbz#2361422)