defining tmpfs /tmp in autoinstall config fails

[Todd Taft]

Attempting to creat a tmpfs /tmp partition with the Ubuntu 20.04 autoinstaller fails with the error: __init__() missing 1 required positional argument: 'device'

The relevant section of the user-data file I'm attempting is:
    - id: tmpfs1
      type: mount
      spec: "none"
      path: "/tmp"
      options: size=4194304
      fstype: "tmpfs"

This section is copied directly from https://curtin.readthedocs.io/en/latest/topics/storage.html (changing the path).
The full file is attached.

Autoinstall succeeds if all of the lines listed above are deleted.

I'm using the daily ISO autoinstall image downloaded using the script at https://github.com/covertsh/ubuntu-autoinstall-generator .

[Michael Hudson-Doyle (mwhudson)]

Ah yeah this makes sense. Should be easy to fix.

[Michael Hudson-Doyle (mwhudson)]

So https://github.com/canonical/subiquity/pull/993 should fix this. I've built this PR into a snap and pushed it to the edge/pr-993 channel so if you add this to your autoinstall.yaml:

refresh-installer:
   update: yes
   channel: "edge/pr-993"

it should work now. (If your install is offline, you should be able to use https://github.com/mwhudson/livefs-editor to stuff the new snap into an ISO).

[Todd Taft (taft)]

The proposed fix works for me, both in the both in the simple example I posted, as well as a more complex configuration that I didn't post.

[Michael Hudson-Doyle (mwhudson)]

Glad to hear it. The fix should be in the edge channel by now, or pretty soon at least.

[Michael Hudson-Doyle (mwhudson)]

And thanks for reporting back!