Introduce `argocd app get-resource` command to display pod information

[nitishfy]

Summary

Right now, there’s no easy way to see the IP addresses of pods using the ArgoCD CLI.
This information is valuable for monitoring, and various operational tasks without requiring direct kubectl access to the cluster. The API call to You can call https://cd.apps.argoproj.io/swagger-ui#tag/ApplicationService/operation/ApplicationService_GetResource solves this problem. However, it would be a great addition to add this functionality wrapped into the CLI as well.

Motivation

#22945

Proposal

Command Syntax

argocd app pods <APPNAME> [flags]

Example Usage

argocd app pods guestbook
argocd app pods guestbook -n dev
argocd app pods guestbook --output json
argocd app pods guestbook --watch

Flags

Flag | Type | Description
|       |    
-n, --namespace | string | Filter pods by a specific namespace. Defaults to the namespace(s) defined in the app spec.
-l, --selector | string | Label selector to filter pods.
-o, --output | string | Output format: wide, json, yaml (default: wide)

Output Format

Similar to kubectl get pods, but scoped to the application's live state

Wide Output (default)

NAME                       READY   STATUS    RESTARTS   AGE   NAMESPACE IP
guestbook-76f5b67c6f-l7ql7 1/1     Running   0          2d    dev      192.112....
redis-master-0            1/1     Running   0          2d    dev.      192.112...

When using the --output json|yaml, return raw pod data as serialized JSON/YAML.

[cjcocokrisp]

Has there been any activity regarding this issue? I'm new and would like to work on this if possible.

[nitishfy]

@cjcocokrisp we'd want to add the argocd app get-resource command than the argocd app pods command. Feel free to take this one.

[cjcocokrisp]

Quick question about the get-resource command. This command is just a wrapper around the swagger endpoint correct? That endpoint outputs the JSON for the current state of the pod.

Is this the functionality for this command that was in mind? Here are the details of what I'm thinking of.

get-resource

Syntax

argocd app get-resource <RESOURCENAME> <KIND>

Example Uses

# To  Get a Pod
argocd app get-resource nginx-XXXXXXXXXXXXXX Pod  
# To Get Something Else
argocd app get-resource nginx-svc Service

Flags

Flag | Type | Description
-n, --namespace | string | The namespace of the resource if none is provided will default to that of the application
-a, --appnamespace | string | The namespace of the parent app if none is provided will default to `argocd` namespace
-o, --output | string | yaml or json, will default to yaml
-g, --group | string | The group of the resource, if none is provided will default to being empty 
-p, --project | string | The project of the resource, if none is provided will default to being empty

Output

The output would be either the json or yaml of the resource requested.