Some projects pick up flags from other projects they include. A great
example would be projects that use glog and thus get all of those flags.
Kubernetes, for example, merges those flags manually into its commands.
This was reported in https://github.com/spf13/cobra/issues/44
What this patch does is merge those flags into the PersistentFlags on
the highest parent. This allows kubernetes to stop having to merge
things themselves...
If the command has not set an output explicitly everything will go to
stderr. This makes a lot of sense, but is a huge PITA for people who
want to be able to grep the help output. It is very common for users to
want to do
command --help | grep flag
This patch fixes that by default help output (but not error output like
an invalid command) to stdout instead of defaulting to stderr.
Eric Paris