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HOWTO_SNAP.md

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Steps:

  • First check that snapcraft can build something:
snapcraft
  • Install it and try it, something like the following, replacing the snap name with the one you just built:
sudo snap install --dangerous charmcraft_0.2.0+95.g6f8c4cc_amd64.snap
  • If needs to be fixed, see section(s) below, GOTO 10

How to add new Python dependencies

If trying a new snap fails because of import errors, you need to include new dependencies.The easiest way to do this is to open the snap, manually copy the needed dependency, and try it: if it keeps failing, keep adding more dependencies, else you're done and just update the stage section in snapcraft.yaml with what you brought in.

Let's go on that procedure. First, open the just built snap:

unsquashfs charmcraft_0.2.0+95.g6f8c4cc_amd64.snap

Copy the dependencies files you need. For example, for the tabulate lib it needs to be included:

tabulate-0.8.7.dist-info
tabulate.py

Remember to not be that specific in snapcraft.yaml, where you could just annotate:

      - lib/tabulate-*.dist-info
      - lib/tabulate.py

You can find these files in the project's virtualenv. So:

cp env/lib/python3.8/site-packages/tabulate* squashfs-root/lib/

Install the snap from the unsquashed dir...

sudo snap try squashfs-root/

...and try again.