$ git clone -n https://src.fedoraproject.org/rpms/sdlhack.git /var/lib/mock/f45-build-35796-699/root/chroot_tmpdir/scmroot/sdlhack
Cloning into '/var/lib/mock/f45-build-35796-699/root/chroot_tmpdir/scmroot/sdlhack'...
$ git fetch origin ca0b47f18d2b5f0167a0da0116592ec12890121a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sdlhack
 * [new ref]         ca0b47f18d2b5f0167a0da0116592ec12890121a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca0b47f drop ix86 support