$ git clone -n https://src.fedoraproject.org/rpms/emacs-filesystem.git /var/lib/mock/f45-build-8083-376/root/chroot_tmpdir/scmroot/emacs-filesystem
Cloning into '/var/lib/mock/f45-build-8083-376/root/chroot_tmpdir/scmroot/emacs-filesystem'...
$ git fetch origin 6343c31bcd277e9580c6c15fe9012160ffdf3d86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-filesystem
 * [new ref]         6343c31bcd277e9580c6c15fe9012160ffdf3d86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6343c31 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild