no way to include devmode snaps in snap prepare-image?

[Steve Langasek]

The client team needs to begin making all-snap images for the Ubuntu Personal stack. However, snap prepare-image refuses to find snaps that have devmode enabled:

  ubuntu-image -c edge pc-amd64-model.assertion --extra-snaps unity8-session \
               --extra-snaps mir-kiosk --extra-snaps mir-libs \
               --extra-snaps mir-client-demos

  Fetching unity8-session
  error: cannot find snap "unity8-session": snap not found

The error message is opaque, but this is at least reasonable default behavior, since we don't want to allow devmode snaps on an all-snap image by default. However, if I try to set allowed-modes: developer, I get this error instead:

  error: model assertion cannot have reserved/unsupported header "allowed-modes" set

So it appears that currently, there is no way to include devmode snaps in a snappy image. This is a blocker for personal images at this point - I assume that the complete set of interfaces needed for a unity8 snap are still a bit away?

[Pat McGowan (pat-mcgowan)]

lower importance as we have a temporary fork that allows it

[Pat McGowan (pat-mcgowan)]

Previous PR was rejected, needs discussion.

[Łukasz Zemczak (sil2100)]

I suppose this no longer is a valid issue. Let me mark it as Incomplete - please re-open if it's otherwise.

[Launchpad Janitor (janitor)]

[Expired for Ubuntu Image because there has been no activity for 60 days.]

[Zygmunt Krynicki (zyga)]

AFAIK we decided not to support this so I'm marking it as won't fix.