$ git clone -n https://src.fedoraproject.org/rpms/emacs-with-editor.git /var/lib/mock/f45-build-8124-377/root/chroot_tmpdir/scmroot/emacs-with-editor
Cloning into '/var/lib/mock/f45-build-8124-377/root/chroot_tmpdir/scmroot/emacs-with-editor'...
$ git fetch origin 77091677adea897dc788a349f2a99df85a412c1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-with-editor
 * [new ref]         77091677adea897dc788a349f2a99df85a412c1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7709167 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild