ubuntu@localhost:~$ fw_printenv |grep -E '^snappy(_|_good_)(os|kernel)'
snappy_good_kernel=canonical-pi2-linux.canonical_4.3.0-1006-1.snap
snappy_good_os=ubuntu-core-armhf.canonical_16.04.0-5.snap
snappy_kernel=canonical-pi2-linux.canonical_4.3.0-1006-1.snap
snappy_os=ubuntu-core-armhf.canonical_16.04.0-5.snap