Set variable on azure task to pass another task of Azure pipeline - azure

Question

I am able to set a variable on powershell or bash script and pass the variable to another task by using ##vso[task.setvariable variable=abc;]xyz. But couldn't find any documentation to set variable on azure tasks like azure webapp deploy task or SqlAzureDacpacDeployment task. I want to catch the error by passing the variable value. Is there any effective way to catch the azure task error log for the next task?
- task: SqlAzureDacpacDeployment#1
displayName: 'Insertion SQL Task'
inputs:
azureSubscription: 'Org (xxxxx-xxxx-xxxx-xxxx-xxxx)'
ServerName: 'tcp:abc.database.windows.net'
DatabaseName: test_db
SqlUsername: '$(user)'
SqlPassword: $(pass)
deployType: SqlTask
SqlFile: 'SQL/test.sql'
enabled: true
- task: AzureWebApp#1
displayName: 'Azure Web App Deploy: $(AppName)'
inputs:
azureSubscription: 'Org (xxxxx-xxxx-xxxx-xxxx-xxxx)'
appType: webApp
ResourceGroupName: 'Test'
appName: '$(AppName)'
package: '$(Build.ArtifactStagingDirectory)\app/*.zip'
deploymentMethod: zipDeploy
enabled: true

Answer 1

You will need to set a name for the task.
For Azure SQL Database Deployment task, you can use the SqlDeploymentOutputFile output variable name.
- task: SqlAzureDacpacDeployment#1
displayName: 'Insertion SQL Task'
name: sqlInsert
inputs:
...
enabled: true
- script: echo "$(sqlInsert.SqlDeploymentOutputFile)"
The Azure Web App task does not provide the same mechanism. You could always call the Pipelines - Get Logs API to get what you need:
pool:
vmImage: ubuntu-latest
steps:
- powershell: Write-Host "Hello World"
name: 'HelloWorld'
- powershell: |
Write-Host "This is a script that could use $env:SYSTEM_ACCESSTOKEN"
# Construct the REST URL to obtain Build ID
$uri = "$(System.CollectionUri)$(System.TeamProject)/_apis/pipelines/$(System.DefinitionId)/runs/$(Build.BuildId)/logs?api-version=6.0-preview.1"
Write-Host "$uri"
$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f "system", $env:SYSTEM_ACCESSTOKEN)))
$logs = Invoke-RestMethod -Uri $uri -Method Get -ContentType "application/json" -Headers #{Authorization=("Basic {0}" -f $base64AuthInfo)}
env:
SYSTEM_ACCESSTOKEN: $(System.AccessToken)