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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>
This commit is contained in:
Yong Tang 2016-11-20 09:57:06 -08:00
parent 0d8fd85842
commit 8e688f17a3
1 changed files with 22 additions and 2 deletions
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24
docker.go
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@ -53,6 +53,23 @@ func newDockerCommand(dockerCli *command.DockerCli) *cobra.Command {
},
}
cli.SetupRootCommand(cmd)
// When invoking `docker stack --nonsense`, we need to make sure FlagErrorFunc return appropriate
// output if the feature is not supported.
// As above cli.SetupRootCommand(cmd) have already setup the FlagErrorFunc, we will add a pre-check before the FlagErrorFunc
// is called.
flagErrorFunc := cmd.FlagErrorFunc()
cmd.SetFlagErrorFunc(func(cmd *cobra.Command, err error) error {
if dockerCli.Client() == nil { // when using --help, PersistenPreRun is not called, so initialization is needed.
// flags must be the top-level command flags, not cmd.Flags()
opts.Common.SetDefaultOptions(flags)
dockerPreRun(opts)
dockerCli.Initialize(opts)
}
if err := isSupported(cmd, dockerCli.Client().ClientVersion(), dockerCli.HasExperimental()); err != nil {
return err
}
return flagErrorFunc(cmd, err)
})
cmd.SetHelpFunc(func(ccmd *cobra.Command, args []string) {
if dockerCli.Client() == nil { // when using --help, PersistentPreRun is not called, so initialization is needed.
@ -167,9 +184,12 @@ func hideUnsupportedFeatures(cmd *cobra.Command, clientVersion string, hasExperi
}
func isSupported(cmd *cobra.Command, clientVersion string, hasExperimental bool) error {
// We check recursively so that, e.g., `docker stack ls` will return the same output as `docker stack`
if !hasExperimental {
if _, ok := cmd.Tags["experimental"]; ok {
return errors.New("only supported on a Docker daemon with experimental features enabled")
for curr := cmd; curr != nil; curr = curr.Parent() {
if _, ok := curr.Tags["experimental"]; ok {
return errors.New("only supported on a Docker daemon with experimental features enabled")
}
}
}