$ git clone -n https://src.fedoraproject.org/rpms/gdm.git /var/lib/mock/f40-build-773547-127218/root/chroot_tmpdir/scmroot/gdm
Cloning into '/var/lib/mock/f40-build-773547-127218/root/chroot_tmpdir/scmroot/gdm'...
$ git reset --hard 940885b1fae35da1cb85cc69c61d59763223787d
HEAD is now at 940885b Exclude i686