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Yong Tang 249d4e5709 Show usage when docker swarm update has no flags

This fix tries to address the issue raised in 24352. Previously,
when `docker swarm update` has no flags, the output is
```
Swarm updated.
```
even though nothing was updated. This could be misleading for
users.

This fix tries to address the issue by adding a `PreRunE` function
in the command so that in case no flag is provided (`cmd.Flags().NFlag() == 0`),
the usage will be outputed instead.

An integration has been added to cover the changes.

This fix fixes 24352.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

2016-12-13 05:05:04 -08:00

command

Show usage when docker swarm update has no flags

2016-12-13 05:05:04 -08:00

flags

Add for String

2016-11-03 16:15:26 +08:00

cobra.go

exit with status 1 if help is called on an invalid command.

2016-11-23 15:13:58 -05:00

error.go

Remove old cli framework.