I'm trying to deploy a python azure function using a DevOps pipeline. For a while, the function would supposedly deploy correctly, but it wouldn't appear in the portal. Eventually I found I could get the function to deploy if I removed all non-native modules from the top of my function_app.py file. This leads me to assume the problem is that the python packages aren't getting built correctly.

This is the code in my pipeline to prep the package:

- job: PublishCode
      steps:
      - task: UsePythonVersion@0
        displayName: 'Use Python 3.11'
        inputs:
          versionSpec: 3.11 # Functions V2 supports Python 3.6 as of today
          architecture: 'x64'
      - bash: |
          pip install --target="./.python_packages/lib/site-packages" -r ./function_folder/requirements.txt
        workingDirectory: $(workingDirectory)
  
      - task: ArchiveFiles@2
        displayName: 'Archive files'
        inputs:
          rootFolderOrFile: '$(workingDirectory)'
          includeRootFolder: false
          archiveType: zip
          archiveFile: $(Build.ArtifactStagingDirectory)/package.zip
          replaceExistingArchive: true
  
      - publish: $(Build.ArtifactStagingDirectory)/package.zip
        artifact: drop

The package is then deployed to the Azure function using a template my company has for Azure resource deployment, but the template uses the AzureFunctionApp@1 function, like so:

          # Azure Deploy Function 
          - ${{ if eq(parameters.validateOnly, false) }}:
            - task: AzureFunctionApp@1
              condition: and(succeeded(), startsWith(variables['APP_TYPE'], 'functionApp'))
              displayName: 'Azure Deploy Function'
              inputs:
                ConnectionType: 'AzureRM'
                azureSubscription: ${{parameters.serviceConnection}}
                appType: ${{parameters.appType}}
                appName: ${{parameters.appName}}
                ${{ if ne('${{ parameters.slotName }}', '') }}:
                  SlotName: ${{parameters.slotName}}
                  deployToSlotOrASE: true
                package: ${{parameters.package}}
                ResourceGroupName: $(APP_RESOURCE_GROUP)

I should mention this is ran after terraform runs to create/update the function app as needed (also part of the template).

I've found in the Microsoft documentation the spot that talks about this exact problem, along with a github issue:

;tabs=vscode%2Cbash&pivots=python-mode-configuration#functions-not-found-after-deployment

Both say to download dependencies into ./.python_packages/lib/site-packages, but this doesn't work. I've also verified that my .zip file is correctly set up, and has the .python_package folder in it.

I'm trying to deploy a python azure function using a DevOps pipeline. For a while, the function would supposedly deploy correctly, but it wouldn't appear in the portal. Eventually I found I could get the function to deploy if I removed all non-native modules from the top of my function_app.py file. This leads me to assume the problem is that the python packages aren't getting built correctly.

This is the code in my pipeline to prep the package:

- job: PublishCode
      steps:
      - task: UsePythonVersion@0
        displayName: 'Use Python 3.11'
        inputs:
          versionSpec: 3.11 # Functions V2 supports Python 3.6 as of today
          architecture: 'x64'
      - bash: |
          pip install --target="./.python_packages/lib/site-packages" -r ./function_folder/requirements.txt
        workingDirectory: $(workingDirectory)
  
      - task: ArchiveFiles@2
        displayName: 'Archive files'
        inputs:
          rootFolderOrFile: '$(workingDirectory)'
          includeRootFolder: false
          archiveType: zip
          archiveFile: $(Build.ArtifactStagingDirectory)/package.zip
          replaceExistingArchive: true
  
      - publish: $(Build.ArtifactStagingDirectory)/package.zip
        artifact: drop

The package is then deployed to the Azure function using a template my company has for Azure resource deployment, but the template uses the AzureFunctionApp@1 function, like so:

          # Azure Deploy Function 
          - ${{ if eq(parameters.validateOnly, false) }}:
            - task: AzureFunctionApp@1
              condition: and(succeeded(), startsWith(variables['APP_TYPE'], 'functionApp'))
              displayName: 'Azure Deploy Function'
              inputs:
                ConnectionType: 'AzureRM'
                azureSubscription: ${{parameters.serviceConnection}}
                appType: ${{parameters.appType}}
                appName: ${{parameters.appName}}
                ${{ if ne('${{ parameters.slotName }}', '') }}:
                  SlotName: ${{parameters.slotName}}
                  deployToSlotOrASE: true
                package: ${{parameters.package}}
                ResourceGroupName: $(APP_RESOURCE_GROUP)

I should mention this is ran after terraform runs to create/update the function app as needed (also part of the template).

I've found in the Microsoft documentation the spot that talks about this exact problem, along with a github issue:

https://learn.microsoft/en-us/azure/azure-functions/recover-python-functions?source=recommendations&tabs=vscode%2Cbash&pivots=python-mode-configuration#functions-not-found-after-deployment

https://github/Azure/azure-functions-python-worker/issues/827

Both say to download dependencies into ./.python_packages/lib/site-packages, but this doesn't work. I've also verified that my .zip file is correctly set up, and has the .python_package folder in it.

• python
• azure
• azure-devops
• azure-functions
• dependencies

• Add SCM_DO_BUILD_DURING_DEPLOYMENT=true and ensure PYTHONPATH=./.python_packages/lib/site-packages in the function app settings. – Dasari Kamali Commented Mar 14 at 10:09

1 Answer 1

Actually, discovered the issue. I was using azure-identity, which currently has an issue with one of it's dependencies, Cryptography. I was able to fix the issue by putting an older version of cryptography (43.0.3) in my requirements.txt

This is the link to the github issue:

https://github/Azure/azure-sdk-for-python/issues/38725

In case something happens to the link, here's the answer from one of the cryptography devs explaining what happened:

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Hi folks, I'm one of the pyca/cryptography developers