How to use SNAP_USER_COMMON istead of SNAP_USER_DATA

nerevarine · March 14, 2025, 2:38pm

I would like a simple configuration option in the yaml to make my snap use SNAP_USER_COMMON as storage for everything by default. What would be the best way to accomplish this?

aoyama · March 15, 2025, 12:30pm

As far as I know, the simplest way to do this is to require the application to support customizing the data storage directory through environment variables.

github.com

boukendesho/anki-snap/blob/master/snap/snapcraft.yaml

name: anki-desktop
base: core24
version: '25.02'
license: AGPL-3.0-or-later
summary: Anki is a spaced repetition program
description: |
  Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.

  Anyone who needs to remember things in their daily life can benefit from Anki. Since it is content-agnostic and supports images, audio, videos and scientific markup (via LaTeX), the possibilities are endless.
  For example:

  - Learning a language
  - Studying for medical and law exams
  - Memorizing people's names and faces
  - Brushing up on geography
  - Mastering long poems
  - Even practicing guitar chords!
platforms:
  amd64:
  arm64:

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For example, I packaged an app called anki, which supports an environment variable called ANKI_BASE. I just need to change this variable to $SNAP_USER_COMMON.

And it’s done.