$ git clone -n https://src.fedoraproject.org/rpms/gnome-characters.git /var/lib/mock/f41-build-side-1-3079854-38944/root/chroot_tmpdir/scmroot/gnome-characters
Cloning into '/var/lib/mock/f41-build-side-1-3079854-38944/root/chroot_tmpdir/scmroot/gnome-characters'...
$ git fetch origin f3ddff818f0e233d28bd054d6edf5054f355e455:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-characters
 * [new ref]         f3ddff818f0e233d28bd054d6edf5054f355e455 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3ddff8 Update to 47.0