$ git clone -n https://src.fedoraproject.org/rpms/emacs-vm.git /var/lib/mock/f45-build-8119-377/root/chroot_tmpdir/scmroot/emacs-vm
Cloning into '/var/lib/mock/f45-build-8119-377/root/chroot_tmpdir/scmroot/emacs-vm'...
$ git fetch origin f80e78ca78737ddf149756d900b24bdcc8da69ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-vm
 * [new ref]         f80e78ca78737ddf149756d900b24bdcc8da69ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f80e78c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild