liuxg@liuxg:~/snappy/desktop/snapcraft/integration_tests/snaps/license$ snapcraft 
Skipping pull nothing (already ran)
Skipping build nothing (already ran)
Skipping stage nothing (already ran)
Skipping prime nothing (already ran)
DEPRECATED: 'license' defined in snapcraft.yaml
[Errno 17] File exists: 'LICENSE' -> '/home/liuxg/snappy/desktop/snapcraft/integration_tests/snaps/license/prime/meta/license.txt'