Yong Tang bb163c30ef Improve error handling of experimental features in non-experimental mode ...

This fix tries to address several issues raised in 28626 where
run against a non-experimental daemon may not generate correct
error message:
1. Incorrect flags were not checked against the supported features:
   ```
   $ docker stack --nonsense
   unknown flag: --nonsense
   ```
2. Subcommands were not checked against the supported features:
   ```
   $ docker stack ls
   Error response from daemon: This node is not a swarm manager...
   ```

This fix address the above mentioned issues by:
1. Add a pre-check for FlagErrorFunc
2. Recursively check if a feature is supported for cmd and its parents.

This fix fixes 28626.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: 8e688f17a3
Component: cli

2017-02-10 16:54:19 -08:00

components/cli

Improve error handling of experimental features in non-experimental mode

2017-02-10 16:54:19 -08:00

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