Cobra: Exit status control

[garthk]

Any chance I could register a callback to handle os.Exit myself when the user stuffs up on flag usage? I need more control over the exit status than your hard-coded os.Exit(-1) permits.

[garthk]

Hang on… that'd be PersistentPreRunE, perhaps. Or do I need to hook all the E functions?

[bep]

I did a clean-up of Hugo in this area some time ago, have a look at

https://github.com/spf13/hugo/blob/master/commands/hugo.go#L126
https://github.com/spf13/hugo/blob/master/commands/hugo.go#L100

To propagate errors from the commands, use the RunE.

[garthk]

The err result from RootCmd.Execute gets RunE and command line problems e.g. unknown options, which is nice… aah, and the undocumented SilenceUsage suppresses the usage text. Awesome.

TL;DR:

// control your exit status with Execute, by default in cmd/root.go:
func Execute() {
    if err := RootCmd.Execute(); err != nil {
        // log it, then
        os.Exit(23)
    }
}