$ git clone -n https://src.fedoraproject.org/rpms/emacs-common-riece.git /var/lib/mock/f45-build-8055-375/root/chroot_tmpdir/scmroot/emacs-common-riece
Cloning into '/var/lib/mock/f45-build-8055-375/root/chroot_tmpdir/scmroot/emacs-common-riece'...
$ git fetch origin 0936a258bbd428885695f6ab9034f18828e952d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-common-riece
 * [new ref]         0936a258bbd428885695f6ab9034f18828e952d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0936a25 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild