$ git clone -n https://src.fedoraproject.org/rpms/cvt12.git /var/lib/mock/f45-build-5784-342/root/chroot_tmpdir/scmroot/cvt12
Cloning into '/var/lib/mock/f45-build-5784-342/root/chroot_tmpdir/scmroot/cvt12'...
$ git fetch origin 3169c958acc6e788411adf230bb64ba158ac684c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cvt12
 * [new ref]         3169c958acc6e788411adf230bb64ba158ac684c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3169c95 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild