[Windows] Juju.exe and MicroK8s.exe volumes mounts wrong path

[Nuno do Carmo]

Hi all,

this is a follow-up from an initial discussion on Juju discourse: https://discourse.charmhub.io/t/windows-juju-and-microk8s-bootstrap-error/4712

I’m currently writing a blog on reproducing Mark Shuttleworth demo at DockerCon 2021, but on Windows, using juju.exe and microk8s.exe.

Based on the "bootstrap error" (https://bugs.launchpad.net/juju/+bug/1931590) bug, I was asked to test another way of adding the cloud config by running the command `microk8s.exe config | juju add-k8s micro`.

The bootstrap could then start, but hanged near the end. After digging into the "controller-0" pod, I could see that the volumes mounts where "translated" as Windows path:
```
Mounts:
          /var/lib/juju from storage (rw)
          /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-ncx4p (ro)
          \var\lib\juju\agents\controller-0\template-agent.conf from controller-agent-conf (rw,path="template-agent.conf")
          \var\lib\juju\bootstrap-params from controller-bootstrap-params (ro,path="bootstrap-params")
          \var\lib\juju\shared-secret from controller-shared-secret (ro,path="shared-secret")
          \var\lib\juju\template-server.pem from controller-server-pem (ro,path="template-server.pem")
```

This generates an error during the pvc creation:
```
Events:
      Type Reason Age From Message
      ---- ------ ---- ---- -------
      Warning FailedScheduling 16m default-scheduler 0/1 nodes are available: 1 pod has unbound immediate PersistentVolumeClaims.
      Normal Scheduled 16m default-scheduler Successfully assigned controller-microk8s-localhost/controller-0 to microk8s-vm
      Warning FailedScheduling 16m default-scheduler 0/1 nodes are available: 1 pod has unbound immediate PersistentVolumeClaims.
```

The expected result, and what I get if I connect directly to the MicroK8s VM and run juju there, is:
```
Mounts:
      /var/lib/juju from storage (rw)
      /var/lib/juju/agents/controller-0/template-agent.conf from controller-agent-conf (rw,path="template-agent.conf")
      /var/lib/juju/bootstrap-params from controller-bootstrap-params (ro,path="bootstrap-params")
      /var/lib/juju/shared-secret from controller-shared-secret (ro,path="shared-secret")
      /var/lib/juju/template-server.pem from controller-server-pem (ro,path="template-server.pem")
      /var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-d85wk (ro)
```

Thanks in advance for your help and support.

[Yang Kelvin Liu (kelvin.liu)]

https://github.com/juju/juju/pull/13141