The following code block explains passing the variable 'agentvalue' to the StopVM stage.
Code explanation:
In the StartVM stage, the variable 'agentvalue' is declared and the agentname value is assigned to the variable 'agentvalue'. Task name 'setagentname' has to be defined for the task if a variable is defined.
In the StopVM stage, the variable called 'VirtualMachine' is created to access the output of agentvalue. The 'VirtualMachine' is accessed only within that stage.
Any variable can only be accessed within that stage after defined.
The dependsOn condition on the StopVM stage is dependent with StartVM and Cleanup stages to complete their executions to continue with StopVM stage.
By default in azure pipelines, the second stage is dependent to the first stage - third to second and so on. If we have only the second stage (Build stage) and StopVM stage, then these two stages will be executed parallely once StartVM stage is completed.
Syntax:
To use the output from a different stage, the format for referencing variables is stageDependencies.STAGE.JOB.outputs['TASK.VARIABLE']
To reference a variable from a task from a different job, use dependencies.JOB.outputs['TASK.VARIABLE']
# Add steps that build, run tests, deploy, and more:
# https://aka.ms/yaml
trigger:
- none
name: $(TeamProject)-$(SourceBranchName)-$(Build.BuildId)-$(Hours)$(Minutes)$(Seconds)-$(Date:yyyyMMdd)$(Rev:.r)
pool:
name: test
parameters:
- name: WarGeneration
displayName: Run WarGeneration
type: boolean
default: false
stages:
- stage: StartVM
displayName: StartVM
jobs:
- job: StartVM
timeoutInMinutes: 0
displayName: StartVM
pool:
name: Azure Pipelines
steps:
- checkout: none
- task: AzureKeyVault@2
inputs:
azureSubscription: 'xxx'
KeyVaultName: 'xxx'
SecretsFilter: 'xxx,yyy'
RunAsPreJob: true
- task: CmdLine@2
inputs:
script: |
az login --service-principal --username $(xxx) --password $(xxx) --tenant $(xxx)
flag=true;
echo $flag
while ($flag); do
vmstatusvm1=`az vm show -g xxx -n vm1 -d --query powerState -o tsv`
vmnamevm1=`az vm show -g xxx -n vm1 -d --query name -o tsv`
vmstatusvm2=`az vm show -g xxx -n vm2 -d --query powerState -o tsv`
vmnamevm2=`az vm show -g xxx -n vm2 -d --query name -o tsv`
if [[ $vmstatusvm1 == 'VM deallocate' && $vm1 == 'vm1' ]]; then
agentname=vm1
echo $agentname
az vm start --resource-group xxx --name $agentname
echo "##vso[task.setvariable variable=agentvalue;isOutput=true]$agentname"
flag=false
elif [[ $vmstatusvm2 == 'VM deallocated' && $vm2 == 'vm2' ]]; then
agentname=vm2
echo $agentname
az vm start --resource-group xxx --name $agentname
echo "##vso[task.setvariable variable=agentvalue;isOutput=true]$agentname"
flag=false
else
echo "There are no VM's available to trigger a new build."
fi
done
name: setagentname
- stage: Build
displayName: Build stage
jobs:
- job: Build
timeoutInMinutes: 0
displayName: Build
steps:
- checkout: none
- task: Bash@3
inputs:
targetType: 'inline'
script: |
echo "Printing virtual none"
- ${{ if eq(parameters.WarGeneration, true) }}:
- stage: WarGeneration
displayName: WarGeneration
jobs:
- job: War
timeoutInMinutes: 0
displayName: War
pool:
name: test
demands:
- Agent.OS -equals Linux
steps:
- checkout: none
- task: AzureKeyVault@2
inputs:
azureSubscription: 'xxx'
KeyVaultName: 'xxx'
SecretsFilter: 'xxx'
RunAsPreJob: true
- stage: Cleanup
displayName: Cleanup stage
condition: always()
jobs:
- job: CleanupJob
timeoutInMinutes: 0
displayName: Cleanup Job
pool:
name: test
demands:
- Agent.OS -equals Linux
steps:
- checkout: none
- task: PowerShell@2
displayName: Cleanup Task
inputs:
targetType: 'inline'
script: |
echo "Cleanup"
- stage: StopVM
displayName: StopVM stage
dependsOn:
- StartVM
- Cleanup
condition: always()
variables:
- name: VirtualMachine
value: $[ stageDependencies.StartVM.StartVM.outputs['setagentname.agentvalue'] ]
jobs:
- job: StopVM
timeoutInMinutes: 0
displayName: StopVM
pool:
name: Azure Pipelines
steps:
- checkout: none
- task: AzureKeyVault@2
inputs:
azureSubscription: 'xxx'
KeyVaultName: 'xxx'
SecretsFilter: 'xxx,yyy'
RunAsPreJob: true
- task: Bash@3
inputs:
targetType: 'inline'
script: |
az login --service-principal --username $(xxx) --password $(xxx) --tenant $(xxx)
az vm deallocate --resource-group xxx --name $(VirtualMachine)
Reference link:
[Use outputs in a different stage - section from link]
https://learn.microsoft.com/en-us/azure/devops/pipelines/process/variables?view=azure-devops&tabs=yaml%2Cbatch#set-in-script
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