Azure pipeline conditions - azure

Question

I'm new to azure. I was told that I need to make a condition: "if this is a request pool, then we run it depending on the content. If this is a build, then we run everything." As I see, each task already has a condition in all of this tasks:
condition: eq(dependencies.check.outputs['Check Changes.BE '], 'true')
As you can see, the task execution depends on the BE\FE variable. Task with that variables looks like this:
- task: CheckChanges#1
name: CheckChanges
pool: "windows-latest"
inputs:
rules: |
[FE]
**/*.json
**/*.ts
**/*.js
**/*.tsx
**/*.scss
**/*.html
**/*.css
[BE]
**/*.csproj
**/*.cs
**/*.yml
**/*.yaml
Here is the tasks with which it needs to be done:
- job: Restore BE
displayName: Restore BE
dependsOn: CheckChanges
condition: eq(dependencies.check.outputs['CheckChanges.BE'], 'true')
steps:
- task: Cake#2
displayName: Restore FE and Sitecore modules
inputs:
script: "$(Build.Repository.LocalPath)/src/build.cake"
target: "Server :: Restore"
verbosity: "Quiet"
Version: "1.3.0"
- job: Restore FE
displayName: Restore FE
dependsOn: CheckChanges
condition: eq(dependencies.check.outputs['CheckChanges.FE'], 'true')
steps:
- task: Cake#2
displayName: Restore FE and Sitecore modules
inputs:
script: "$(Build.Repository.LocalPath)/src/build.cake"
target: "Client :: Restore"
verbosity: "Quiet"
Version: "1.3.0"
- job: Build BE
displayName: Build BE
dependsOn: CheckChanges
condition: eq(dependencies.check.outputs['CheckChanges.BE'], 'true')
steps:
- task: Cake#2
displayName: Generate and Build FE and Sitecore
inputs:
script: "$(Build.Repository.LocalPath)/src/build.cake"
target: "Server :: Build"
verbosity: "Quiet"
arguments: '--BuildConfiguration "Release" --ScSiteUrl "dummy"'
Version: "1.3.0"
- job: Build FE
displayName: Build FE
dependsOn: CheckChanges
condition: eq(dependencies.check.outputs['CheckChanges.FE'], 'true')
steps:
- task: Cake#2
displayName: Generate and Build FE and Sitecore
inputs:
script: "$(Build.Repository.LocalPath)/src/build.cake"
target: "Client :: Build"
verbosity: "Quiet"
arguments: '--BuildConfiguration "Release" --ScSiteUrl "dummy"'
Version: "1.3.0"
- job: Unit tests BE
displayName: Unit tests BE
dependsOn: CheckChanges
condition: eq(dependencies.check.outputs['CheckChanges.BE'], 'true')
steps:
- task: Cake#2
displayName: Run Unit tests
inputs:
script: "$(Build.Repository.LocalPath)/src/build.cake"
target: "Server :: Tests"
verbosity: "Quiet"
Version: "1.3.0"
- job: Unit tests FE
displayName: Unit tests FE
dependsOn: CheckChanges
condition: eq(dependencies.check.outputs['CheckChanges.FE'], 'true')
steps:
- task: Cake#2
displayName: Run Unit tests
inputs:
script: "$(Build.Repository.LocalPath)/src/build.cake"
target: "Client :: Tests"
verbosity: "Quiet"
Version: "1.3.0"
I don't understand what I need to do. My Team Lead just say: "If it's a Pull Request, then we run it depending on the content. If it's a build, then we run everything."

Answer 1

If it's a Pull Request, then we run it depending on the content. If it's a build, then we run everything.
You can use the Pipeline Predefined variable: Build.Reason to confirm if the pipeline is triggered by Pull Request or other method.
You can add the predefined variable in condition and use expression to link the filters.
For example:
Add condition to CheckChanges task.
- task: CheckChanges#1
condition: eq(variables['Build.Reason'], 'PullRequest')
Add condition to other jobs:
- job: Restore BE
displayName: Restore BE
dependsOn: CheckChanges
condition: Or(eq(dependencies.check.outputs['CheckChanges.FE'], 'true'),ne(variables['Build.Reason'], 'PullRequest'))
steps:
- task: Cake#2
displayName: Restore FE and Sitecore modules
inputs:
script: "$(Build.Repository.LocalPath)/src/build.cake"
target: "Server :: Restore"
verbosity: "Quiet"
Version: "1.3.0"
Explanation:
When the Pipeline is triggered by Pull Request, the checkChanges task will run and the tasks will run based on the content.
Or the pipeline will run all tasks, if the pipeline is not triggered by Pull Request.
For more detailed info, you can refer to the doc: Condition, Expression, Predefined Variable