Friday, 22 May 2020

3 - Build Process

Hopefully you have an automated build process!

Azure DevOps, GitHub and many other sources provide this as a service and once you've converted to using it you'll never go back. We use Azure DevOps for our code and CI/CD capabilities so it was pretty easy to upgrade.

Most of our libraries were written a while ago and used the "classic" build tool, which had a GUI interface and helped you create the build pipeline. However, it was really tedious to use on lots of projects, as you had to manually re-create the same process over and over for each one.

The newest hotness is the Azure Pipelines YAML support - you can now add a build file to source control and then configure a build pipeline to use this. The build pipeline is now part of the source control process and you can edit/upgrade/copy these more easily.

As most of my libraries follow a standard format I re-used the same .YML file in each project, just editing a single line to specify which project I wanted to package into a Nuget library.

Once I'd pushed the repository up to Azure DevOps, I just created a new pipeline and pointed it at the YML file in the repo.

# dotnet standard library build-test-pack-nugetpush

# This build is triggered if changes are pushed to the master branch
trigger:
- master

# Use the 'Default' agent pool (our own hosted agents)
# if you want to use Azure DevOps built-in agents, change to
#  vmImage: 'ubuntu-latest'
# or
#  vmImage: 'windows-latest'

# since this is proejct .NET Std and .NET Core either will work
# if it still has .NET Framework, use the windows version
pool:
  name: Default

variables:
  solution: '**/*.sln'
  buildPlatform: 'Any CPU'
  buildConfiguration: 'Release'
  project: '[project-folder]/[project-name].csproj'
  # this is used to signal which project is to be packaged into a Nuget package

steps:

# ensure the latest 3.1.x SDK is loaded for the build
- task: UseDotNet@2
  displayName: 'Load SDK using 3.1.x'
  inputs:
    version: 3.1.x

# restore packages, and include any in our internal feed
- task: DotNetCoreCLI@2
  displayName: 'restore packages'
  inputs:
    command: restore
    vstsFeed: '[internal-feed-ID]'

- task: DotNetCoreCLI@2
  displayName: Build solution
  inputs:
    projects: '$(solution)'
    arguments: '--configuration $(BuildConfiguration)'

- task: DotNetCoreCLI@2
  displayName: Run Unit tests
  inputs:
    command: test
    projects: '$(solution)'
    arguments: '--configuration $(BuildConfiguration)'

# this is a VSTS task I created to set environment variables from the project

# version and append the build number (it's in the marketplace)
#
# the old NUGET PACK used to allow wildcards e.g. 1.2.* but "dotnet pack" does not.
# e.g. if the project is version 1.2.3 this sets VERSION_BUILD to 1.2.3.[buildNo]

# Note: this uses PowerShell so won't work for ubuntu agents
#
- task: conficient.VersionReaderTask.version-reader-build-task.VersionReaderTask@1
  displayName: 'Generate build variables '
  inputs:
    searchPattern: '$(project)'
    buildPrefix: '.'

# package the project and version using the environment variable
- task: DotNetCoreCLI@2
  displayName: Pack
  inputs:
    command: pack
    packagesToPack: '$(project)'
    versioningScheme: byEnvVar
    versionEnvVar: 'VERSION_BUILD'

# push the .nupkg packages to our internal Nuget feed
- task: DotNetCoreCLI@2
  displayName: 'Push'
  inputs:
    command: 'push'
    packagesToPush: '$(Build.ArtifactStagingDirectory)/*.nupkg'
    nuGetFeedType: 'internal'
    publishVstsFeed: '[internal-feed-ID]'  # change this to your feed

# I've commented the pipeline to help you understand what each part does


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