Chectl should try to detect installed namespace for appropriate commands

[amisevsk]

Is your enhancement related to a problem? Please describe

Some commands, e.g. chectl server:logs require the -n, --chenamespace parameter if Che is installed in a non-default namespace. However, in many cases, it is possible to discover the installed namespace via the Kubernetes API (e.g. by listing all CheClusters).

❯ chectl server:logs
Eclipse Che logs will be available in '/tmp/chectl-logs/1648573985115'
› Current Kubernetes context: 'amisevsk-che/<snip>:6443/amisevsk'
  ✔ Verify Kubernetes API...OK (it's OpenShift)
  ✖ Verify if namespace 'eclipse-che' exists
    → The Kubernetes Namespace "eclipse-che" doesn't exist.

❯ kubectl get CheClusters --all-namespaces
NAMESPACE    NAME          AGE
dogfooding   eclipse-che   650d

Describe the solution you'd like

Since commands like chectl server:logs do not modify any resources on the cluster, they should automatically detect the namespace and report a useful message if this is not possible.

Describe alternatives you've considered

The error message should suggest using the -n parameter if it cannot find the installation in the default namespace.

Additional context

No response

[tolusha]

chectl server:logs -n <NAMESPACE> ?

[amisevsk]

chectl server:logs -n ?

That's one of the alternatives suggested, but as an inexperienced user, if Che is not installed in eclipse-che, the error message is just

  ✖ Verify if namespace 'eclipse-che' exists
    → The Kubernetes Namespace "eclipse-che" doesn't exist.
    Read logs
    Error: Command server:logs failed. Error log: /home/amisevsk/.cache/chectl/error.log. Eclipse Che logs: /tmp/chectl-logs/1648646484798.

Which is a little confusing. Maybe the following is easier to understand without referencing docs or help pages:

  ✖ Verify if namespace 'eclipse-che' exists
    → The Kubernetes Namespace "eclipse-che" doesn't exist. Use the -n parameter to specify namespace for Eclipse Che installation.
    Read logs
    Error: Command server:logs failed. Error log: /home/amisevsk/.cache/chectl/error.log. Eclipse Che logs: /tmp/chectl-logs/1648646484798.

It also means the documentation has to explicitly include "If Che is not installed in the default namespace, the -n parameter must be used to specify the installed namespace".

However, if we're making k8s API calls already, it's very easy to figure out this namespace automatically and not require -n in the first place.