Fail to deploy .net core function app using az functionapp deployment source config-zip

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Describe the bug

When deploying a .net core function app to Azure Functions on Windows App Service Plan, the deployment fails if it requires changes in app settings.

There’s a race condition here:

1. If the app settings are changed before or after the deployment is initiated, the build fails.
2. If the app settings are not changed before the deployment is initiated, the build succeeds.

To Reproduce

1. Create a .Net Core 2.2 Function App in Windows Standard App Service Plan
2. Prepare a simple function app content, and compress it into a zip file.
3. Run the command to change the appsettings az functionapp config appsettings set -n $functionAppName -g $resourceGroupName --settings APPINSIGHTS_INSTRUMENTATIONKEY=$instrumentationKey
4. Run the command az functionapp deployment source config-zip -g $resourceGroupName -n $functionAppName --src <local_zip_file>
5. Wait a while and will see the deployment failure error

Expected behavior

The deployment should succeed.

Environment summary

DevOps Hosted Agent: Ubuntu 16.04 Azure CLI Task Shell Type: bash CLI Version: azure-cli 2.2.0

command-modules-nspkg 2.0.3 core 2.2.0 nspkg 3.0.4 telemetry 1.0.4

Extensions: azure-devops 0.17.0

Python location ‘/opt/az/bin/python3’ Extensions directory ‘/opt/az/azcliextensions’

Python (Linux) 3.6.5 (default, Mar 6 2020, 14:41:35) [GCC 5.4.0 20160609]

Legal docs and information: aka.ms/AzureCliLegal

Your CLI is up-to-date.

Additional context

[m1ckr1sk]

We are also seeing this issue on both v2.2.0 and v2.3.1 when deploying function apps. Last successful deployment was on v2.1.0

[anthonychu]

Looks like the app was still restarting after changing the app setting when you started the deployment command. Can you either wait until the restart completes or change the setting after deployment is complete?