$ git clone -n https://src.fedoraproject.org/rpms/create-fake-rpm.git /var/lib/mock/f45-build-5685-341/root/chroot_tmpdir/scmroot/create-fake-rpm
Cloning into '/var/lib/mock/f45-build-5685-341/root/chroot_tmpdir/scmroot/create-fake-rpm'...
$ git fetch origin d4d6cc6ea96deda0de1e01d98432c1067abc28e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/create-fake-rpm
 * [new ref]         d4d6cc6ea96deda0de1e01d98432c1067abc28e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4d6cc6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild