$ git clone -n https://src.fedoraproject.org/rpms/fabtests.git /var/lib/mock/f45-build-8632-392/root/chroot_tmpdir/scmroot/fabtests
Cloning into '/var/lib/mock/f45-build-8632-392/root/chroot_tmpdir/scmroot/fabtests'...
$ git fetch origin 8d93b5c6df1eb27e639ab454c1db6b79001c56b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fabtests
 * [new ref]         8d93b5c6df1eb27e639ab454c1db6b79001c56b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d93b5c disable build on i686