Misleading message when creating functionapp

[zikalino]

Describe the bug
When creating functionapp you try to specify --deployment-container-image-name httpd without passing --plan that is is_linux, Azure CLI resoponds with following message, which is quite misleading:

usage error: --runtime RUNTIME required for linux functions apps without custom image.

To Reproduce

az group create --name zimsfromclixx --location westeurope

az storage account create --name zimsstoragefromclixx --location westeurope --resource-group zimsfromclixx --sku Standard_LRS

az functionapp create --resource-group zimsfromclixx --os-type Linux --name zimsfromclixx --deployment-container-image-name httpd --storage-account zimsstoragefromclixx

Expected behavior
Argument --deployment-container-image-name should not be just ignored.
The message should be perhaps "Argument --deployment-container-image-name can be only specified with plan that is_linux" or something like this.

Environment summary
CloudShell

Additional context
Add any other context about the problem here.

[ankitkumarr]

Hi @zikalino, I am unable to reproduce this bug in cloudshell. On running something like- az functionapp create --resource-group zimsfromclixx --os-type Linux --name zimsfromclixx --deployment-container-image-name httpd --storage-account zimsstoragefromclixx,
I get this error-
usage error: --plan NAME_OR_ID | --consumption-plan-location LOCATION

which is expected. Did you have any additional param?

On providing a --plan, it works fine for me.

[zikalino]

@ankitkumarr I can recheck that. perhaps something got updated in a meanwhile. or something is different in my subscription. I think if I haven't specified --plan it was either creating a default one or finding one in the subscription. I am not sure now.

[ankitkumarr]

@zikalino, I think you might have specified --consumption-plan-location. If you specify that, you cannot have custom image. So, that's why --consumption-plan-location was ignored and you got that error message.
I agree that the error message should be clear and let people know that you shouldn't use --consumption-plan-location and --deployment-container-image-name at the same time. We should fix that. Thanks for the report!

\cc @ahmedelnably