$ git clone -n https://src.fedoraproject.org/rpms/emacs.git /var/lib/mock/f41-build-808127-145685/root/chroot_tmpdir/scmroot/emacs
Cloning into '/var/lib/mock/f41-build-808127-145685/root/chroot_tmpdir/scmroot/emacs'...
$ git fetch origin 9b5c26fbaded5d4d5500bfc0510a987a0b0f2ded:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs
 * [new ref]         9b5c26fbaded5d4d5500bfc0510a987a0b0f2ded -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b5c26f Tweak subpackage summaries and descriptions.