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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>
This commit is contained in:
Yong Tang 2016-11-30 13:23:18 -08:00
parent bc8091d9cc
commit 249d4e5709
1 changed files with 6 additions and 0 deletions
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6
command/swarm/update.go
View File

@ -23,6 +23,12 @@ func newUpdateCommand(dockerCli *command.DockerCli) *cobra.Command {
RunE: func(cmd *cobra.Command, args []string) error {
return runUpdate(dockerCli, cmd.Flags(), opts)
},
PreRunE: func(cmd *cobra.Command, args []string) error {
if cmd.Flags().NFlag() == 0 {
return pflag.ErrHelp
}
return nil
},
}
cmd.Flags().BoolVar(&opts.autolock, flagAutolock, false, "Change manager autolocking setting (true|false)")