$ git clone -n https://src.fedoraproject.org/rpms/gnome-characters.git /var/lib/mock/f40-build-2055729-49119/root/chroot_tmpdir/scmroot/gnome-characters
Cloning into '/var/lib/mock/f40-build-2055729-49119/root/chroot_tmpdir/scmroot/gnome-characters'...
$ git fetch origin b5d8b61ea47a8d822e348a37623bac46f85f2a54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-characters
 * [new ref]         b5d8b61ea47a8d822e348a37623bac46f85f2a54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5d8b61 Update to 45.0