The current operating system is not capable of running this task

[MichaelSchHtc]

Describe the bug
I tried to setup the dependabot on a Azure DevOps Server 2020.
I installed the extension (1.30.0.776).
I created the dependabot.yml-File and the pipeline.
But the task in the pipeline fails immediately with this error: "The current operating system is not capable of running this task. That typically means the task was written for Windows only. For example, written for Windows Desktop PowerShell."

Repository
It's a private (self hosted) repo.

Expected behavior
I expect the dependabot to complete successfully and create the pull requests to update the old packages.

Extension

• Host: Azure DevOps Server 2020 Update 1.2
• Version (Extension): 1.30.0.776

Additional context
I tried to give the Project Collection Service Accounts all possible permissions.
As an Agent pool i use: Ubuntu - 20.04.5 LTS (Focal Fossa).
On the agent docker is installed. Docker-Version: 20.10.21, build baeda1f
This agent is used for the "normal" builds and works without any problems.

The Output is:

Starting: Run Dependabot
==============================================================================
Task         : Dependabot
Description  : Automatically update dependencies and vulnerabilities in your code
Version      : 1.30.776
Author       : Tingle Software
Help         : For help please visit https://github.com/tinglesoftware/dependabot-azure-devops
==============================================================================
##[error]The current operating system is not capable of running this task. That typically means the task was written for Windows only. For example, written for Windows Desktop PowerShell.
##[debug]System.InvalidOperationException: The current operating system is not capable of running this task. That typically means the task was written for Windows only. For example, written for Windows Desktop PowerShell.
   at Microsoft.VisualStudio.Services.Agent.Worker.TaskRunner.RunAsync()
   at Microsoft.VisualStudio.Services.Agent.Worker.StepsRunner.RunStepAsync(IStep step, CancellationToken jobCancellationToken)
Finishing: Run Dependabot

pipeline-yaml:

name: 'Dependabot CI'
trigger: none
stages:
  - stage: CheckDependencies
    displayName: 'Check Dependencies'
    jobs:
      - job: Dependabot
        displayName: 'Run Dependabot'
        pool:
          name: 'LinuxDocker'
        steps:
        - task: dependabot@1
          displayName: 'Run Dependabot'
          inputs:
            failOnException: false

dependabot-yaml:

version: 2
updates:
- package-ecosystem: "npm"
    directories:
      - "/path/to/package.json/" (replaced fo this issue / bug)
    schedule:
      interval: "weekly"
    labels:
      - "dependabot"
      - "dependencies"

[mburumaxwell]

I don't know if it is possible to run a container in another container specifically for Azure DevOps. That's what I gather from the pool named LinuxDocker. Try the hosted agents (the free minutes per month should generally be enough for weekly runs) or an agent that is not a docker container.

[MichaelSchHtc]

The agent itself is not a container. The name (LinuxDocker) is choosen to indicate that docker is available.

[mburumaxwell]

I suggest that you check the setup for the private agent. The only requirements are run on an Agent/DeploymentGroup here, docker be present and discoverable here, and the agent be version be recent here.

[MichaelSchHtc]

All this requirements are fulfilled (Agent-Version is 2.181.2).
I also tried it with another agent (that also meets this requirements) but it throws the same Exception.

I guess that I will try a hosted agent.

[mburumaxwell]

The change in #1246 should ideally solve the issue. I released 1.30.2 you can test and report back.

[MichaelSchHtc]

The new version (1.30.2.800) doesn't solve the problem. The same error occurs immediately after starting the dependabot-task.

[mburumaxwell]

Could you give an example of some of the "normal" builds that work without any problems? This will be useful to see tasks in them that work for comparison sake.

[MichaelSchHtc]

This is the requested pipeline for a "normal" build:

stages:
  - stage: BuildAndTests (Reducted - here the .NET Solution and the react-app gets build / published on another agent)
  - stage: Docker_Build
    displayName: Docker Build
    pool:
      name: 'LinuxDocker'
    variables:
      NumericVersion: $[ stageDependencies.BuildAndTests.BuildAndTests.outputs['CreateVersionVariable.numericVersion'] ]
    jobs:
      - job: DockerImage
        steps:
        - task: Docker@2
          displayName: 'Build Docker'
          inputs:
            containerRegistry: '<Reducted>'
            repository: '<Reducted>'
            command: 'build'
            Dockerfile: 'src/**/Dockerfile'
            tags: |
              $(Build.BuildNumber)
              latest
            arguments: '--build-arg BUILDNUMBER=$(NumericVersion)'
  - stage: Docker_Deploy
    displayName: Docker Deploy
    pool:
      name: 'LinuxDocker'
    jobs:
      - deployment: <Reducted>
        displayName: Deploy
        environment: '<Reducted>'
        strategy:
          runOnce:
            deploy:
              steps:
                - task: Docker@2
                  displayName: 'Push image'
                  inputs:
                    containerRegistry: '<Reducted>'
                    repository: '<Reducted>'
                    command: 'push'
                    tags: |
                      $(Build.BuildNumber)
                      latest

Perhaps relevant: This features are available on the agent (LinuxDocker)

Agent.Name REDUCTED
Agent.Version 2.181.2
_ ./externals/node/bin/node
Agent.ComputerName REDUCTED
Agent.HomeDirectory REDUCTED
Agent.OS Linux
Agent.OSArchitecture X64
curl /usr/bin/curl
docker /usr/bin/docker
dotnet /usr/bin/dotnet
git /usr/bin/git
HOME REDUCTED
InteractiveSession False
INVOCATION_ID REDUCTED
JOURNAL_STREAM 9:45971
LANG en_US.UTF-8
LOGNAME REDUCTED
PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
PWD REDUCTED
python /usr/bin/python
python3 /usr/bin/python3
sh /bin/sh
SHELL /bin/bash