$ git clone -n https://src.fedoraproject.org/rpms/gnome-session.git /var/lib/mock/f40-build-2218179-52593/root/chroot_tmpdir/scmroot/gnome-session
Cloning into '/var/lib/mock/f40-build-2218179-52593/root/chroot_tmpdir/scmroot/gnome-session'...
$ git fetch origin 72c60f5511d65547bfc4ea7afbe57d7a0b1ff3f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-session
 * [new ref]         72c60f5511d65547bfc4ea7afbe57d7a0b1ff3f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 72c60f5 Exclude i686