Category: Cloud

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Success pipeline state on GitHub with pipeline failure

When your pipeline fails on Azure DevOps and the source code is gathered from GitHub (using a service connection) you will notice a failure icon on the repository because the status of the run from Azure DevOps is reported to GitHub. This is the normal behavior and we want it to work like that.

Lets take as example the below run.

The failure will be visible on the github along with the particular commit.

However sometimes we need to allow tasks fail without reporting a failure state on GitHub. You can do that by using continueOnError keyword. With this functionality you instruct the DevOps platform to allow failure for a particular task or job without stopping the pipeline. 

trigger:
- none

pool:
  vmImage: ubuntu-latest

jobs:
- job: job1

  steps:
  - script: this script will fail
    continueOnError: true
    displayName:  task 1

  - task: PowerShell@2
    displayName: task 2
    inputs:
      targetType: 'inline'
      script: |
        Write-Host "Hello World"

This will result on a warning state for your pipeline on Azure DevOps.

This means that the pipeline has been executed successfully but some steps have failed.

Nevertheless the state on GitHub will be success as the pipeline is not in a failed state on Azure DevOps.

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##[error]Error: An unexpected error occurred while trying to push the package with VstsNuGetPush.exe – You need to have ‘ReadPackages’

When you try to push a nuget package from a DevOps pipeline on Artifacts feed you may face the below error.

##[error]Error: An unexpected error occurred while trying to push the package with VstsNuGetPush.exe. Exit code(1) and error(Error:
Microsoft.VisualStudio.Services.Common.VssServiceException: User 'xxx' lacks permission to complete this action. You need to have 'ReadPackages'

This error could be resolved by editing the settings of the feed.

In more detail under permissions you can find which users or service account can perform actions based on their role.

By default I could locate the Project Collection Build Service (Organization) with the Contributor permissions but did not work. As a solution I removed that and added "Project Name" Build Service (Organization). This is the build service for the project on which I have created the pipeline specifically.

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Starting template for Azure devops pipeline

The below code can be used as a starter entry point for your DevOps pipelines. It is designed with best practices in mind with stages and jobs in order to isolate different functionalities and make it modular. You can include more stages,jobs,tasks by copy and pasting the code.

trigger:
- none

pool:
  vmImage: ubuntu-latest

stages:
- stage: stage1
  displayName: display name for your stage
  jobs:
  - job: job1
    displayName: display name for job1
    steps:
    - script: echo job1.task1
      displayName: running job1.task1

  - job: job2
    displayName: display name for job2
    steps:
    - script: echo job2.task1
      displayName: running job2.task1

The result is shown below

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Structure python code with packages – import functions from different files

A modular application is an application composed of loosely coupled, functional units called modules, and these modules can be linked together to form a larger application. When you implement your python applications you should create such structures instead of big monoliths.

In this guide I will demonstrate how you can call python function from different folders and files (called packages). I have created a flask application which has as entrypoint the app.py file.

The solution is structured as shown below. The app folder is the root folder which contains all the code for the application. In the root hierarchy the app.py is placed along with other folders as templates, static and helpers.

As I need to create a helper function that will request data from an external API I created a file named github inside my helpers folder and I defined a function within it.

The function is very simple and returns a simple message. Code for github.py can be found below.

def my_function():
  return "Hello from function"

In order to call your helper functions from your main app or from another python package you should first import package 

from helpers import github

and then use the function.

@app.route("/")
def home():
    return github.my_function()

This code will display on my flask main page the message of the function.

You can perform in such way any other activities by specifying your python file and then the function.

pythonFile.Function()