$ git clone -n https://src.fedoraproject.org/rpms/gdm.git /var/lib/mock/f31-build-98987-33111/root/chroot_tmpdir/scmroot/gdm
Cloning into '/var/lib/mock/f31-build-98987-33111/root/chroot_tmpdir/scmroot/gdm'...
$ git reset --hard f4c805817097c8d033043893bd2775256b607d28
HEAD is now at f4c8058 Drop patch from -2, better fix was applied to systemd