$ git clone -n https://src.fedoraproject.org/rpms/qqwing.git /var/lib/mock/f45-build-34012-676/root/chroot_tmpdir/scmroot/qqwing
Cloning into '/var/lib/mock/f45-build-34012-676/root/chroot_tmpdir/scmroot/qqwing'...
$ git fetch origin f31f5b96371f80fe2721134abf1df46ddedc13db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qqwing
 * [new ref]         f31f5b96371f80fe2721134abf1df46ddedc13db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f31f5b9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild