Yong Tang 5aa5a1cb00 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
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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	…
required.go	…