$ git clone -n https://src.fedoraproject.org/rpms/emacs-auto-complete.git /var/lib/mock/f45-build-8043-374/root/chroot_tmpdir/scmroot/emacs-auto-complete
Cloning into '/var/lib/mock/f45-build-8043-374/root/chroot_tmpdir/scmroot/emacs-auto-complete'...
$ git fetch origin 8749e49a9812ca60a2d09f398f702d74e4554ab4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-auto-complete
 * [new ref]         8749e49a9812ca60a2d09f398f702d74e4554ab4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8749e49 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild