az aks enable-addons --addons ingress-appgw not idempotent

[markdebruijne]

az feedback auto-generates most of the information requested below, as of CLI version 2.0.62

Describe the bug Repeating the command below should not returning an error

        $aksIngressControllerOutput = az aks enable-addons `
            --appgw-id $agwic.id `
            --resource-group $resourceGroupName `
            --name $aksClusterName `
            --addons ingress-appgw `

Error that I receive

ERROR: The ingress-appgw addon is already enabled for this managed cluster.
To change ingress-appgw configuration, run "az aks disable-addons -a ingress-appgw -n <clustername> -g rg-name" before enabling it again.

source (probably outdated, but maybe still applicable): https://github.com/Azure/azure-cli-extensions/blob/master/src/aks-preview/azext_aks_preview/custom.py#L3380

To Reproduce Repeat the above command multiple times

Expected behavior From the CLI command design guidelines

‘create’ commands should be idempotent and should return the resource that was created.

Environment summary

azure-cli                         2.22.1 *

core                              2.22.1 *
telemetry                          1.0.6

Extensions:
application-insights              0.1.13
azure-devops                      0.18.0

Python location 'C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\python.exe'
Extensions directory 'C:\Users\<usert>\.azure\cliextensions'

Python (Windows) 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 23 2018, 23:31:17) [MSC v.1916 32 bit (Intel)]

Additional context n/a

[ghost]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @Azure/aks-pm.

Issue Details

---

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.62 **Describe the bug** Repeating the command below should not returning an error ``` $aksIngressControllerOutput = az aks enable-addons ` --appgw-id $agwic.id ` --resource-group $resourceGroupName ` --name $aksClusterName ` --addons ingress-appgw ` ``` Error that I receive ``` ERROR: The ingress-appgw addon is already enabled for this managed cluster. To change ingress-appgw configuration, run "az aks disable-addons -a ingress-appgw -n -g rg-name" before enabling it again. ``` source (probably outdated, but maybe still applicable): https://github.com/Azure/azure-cli-extensions/blob/master/src/aks-preview/azext_aks_preview/custom.py#L3380 **To Reproduce** Repeat the above command multiple times **Expected behavior** From the CLI command design guidelines > ‘create’ commands should be idempotent and should return the resource that was created. **Environment summary** ``` azure-cli 2.22.1 * core 2.22.1 * telemetry 1.0.6 Extensions: application-insights 0.1.13 azure-devops 0.18.0 Python location 'C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\python.exe' Extensions directory 'C:\Users\\.azure\cliextensions' Python (Windows) 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 23 2018, 23:31:17) [MSC v.1916 32 bit (Intel)] ``` **Additional context** n/a

Author:	markdebruijne
Assignees:	-
Labels:	`AKS`, `Service Attention`
Milestone:	-

[yonzhan]

route to service team

[Volatus]

@markdebruijne What output do you expect to see?