Display more information about current target (target view/describe)

[petersutter]

What would you like to be added:
It should be possible to display more information about the current target, e.g. show shoot, control-plane, project, garden, seed, provider in case the information can be derived from the current target.

Why is this needed:

[petersutter]

related issue #109

[tedteng]

per information #120 and #109, I don't know which one is best. either display required information after targeting the shoot cluster gardenctl target --project xx --project xx --shoot xx, or display all information when gardenctl target view is called.

a user case I can think of is to display seed information after the target shoot cluster, plus target command guide, and fetch provider env from os env to display it. eg AZURE_CLIENT_ID=, AZURE_CLIENT_SECRET,AZURE_TENANT_ID etc, if no objections I like to work on this feature. extend gardenctl target view with full information flag

without flag: still the same as current
gtv gardenctl target view

garden: local
project: my-project
shoot: my-shoot

with flag:

gardenctl target view -foo

garden: local
project: my-project
shoot: my-shoot
seed: my-seed

Target garden: gardenctl target --garden local
Target project: gardenctl target --garden local --project my-project
Target shoot: gardenctl target --garden local --seed my-seed 
Target seed: gardenctl target --garden local --project seedproject --shoot my-seed

KUBECONFIG=/var/xxx/kubeconfig.yaml
AZURE_CLIENT_ID=abc
AZURE_CLIENT_SECRET=abc
AZURE_TENANT_ID=abc
AZURE_SUBSCRIPTION_ID=abc
AZURE_CONFIG_DIR=/var/f6fd/.config/az

[petersutter]

First we should agree on what should be displayed before working on this issue and how should the command be used. -foo flag as placeholder is not helpful for the discussion.

Btw., with provider information I was referring to aws, gcp etc. provider type.

I do not think it's a good idea to print the env variables. What should be the benefit?

I also do not see a use case for printing out

Target garden: gardenctl target --garden local
Target project: gardenctl target --garden local --project my-project
Target shoot: gardenctl target --garden local --seed my-seed 
Target seed: gardenctl target --garden local --project seedproject --shoot my-seed