Attaching custom build ubuntu core image to private store

[PiotrD]

Hmm simply adding auth.json file to a root user dir does not work. I see with snap whoami command my user, but I cannot see my private snap in a store. I only see it when I do full snap login. Is it even possible to do it this way ?

I also found this old topic regarding using private snap with custom-build image

Unable to create an image that uses private snaps

I have a private snap in the store. I’m logged in, and I can sudo snap install my-private-snap. I assumed that meant I could also create an Ubuntu Core image using that private snap, but that doesn’t seem to be the case: $ sudo ubuntu-image -c beta amd64.model Fetching core Fetching pc-kernel Fetching pc Fetching my-private-snap error: cannot find snap "my-private-snap": snap not found COMMAND FAILED: snap prepare-image --channel=beta amd64.model /tmp/tmpmlrgh4bg/unpack Is this by design?

which states that it is only possible with a brand store. Is it still like this ?

There is also info like this, but I do not understand how and where to use this. Or even if it is possible

What is supported atm is using UBUNTU_STORE_AUTH_DATA_FILENAME to point to a JSON file with the macaroon bits ( {"macaroon": ..., "discharges": [...]} , where discharges are actually unbound), there is no official tooling to create such a file though.

Any suggestions are welcome