[PROTOTYPE]: Interim bases

[lengau]

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• Have you successfully run make lint && make test?

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[lengau]

We should do this somewhere better - this spot was just a cheap hack.

[lengau]

This is duplicated in utils.py due to some import issues when generating the snap. I can delete this file

[tigarmo]

Thanks! I think there are a few pieces missing:

1. How do we update archive urls in destructive-mode?
2. We also need to update the archive urls in the overlay system, like we do for package-repositories
3. As per bullet point 2 in R4 on the spec, we need to tell craft-parts to pass --ack-unsupported-release when cutting chisel slices.

[tigarmo]

I don't think we need to support 25.04 (but I'm fine with leaving it in for testing purposes while it's a prototype)

[lengau]

Yeah IDK what versions we want, but 25.04 and 25.10 were a good pair to test current interim and pre-release interim.

I took out the stuff about changes to the bases.

[lengau]

@tigarmo

How do we update archive urls in destructive-mode?

Good point. I've added both this and the overlay installer to the lifecycle service.

For production I think we should modify craft-archives to be able to modify the existing /etc/apt/sources.list or /etc/apt/sources.list.d/ubuntu.sources files - that sed command is just a quick hack.

As per bullet point 2 in R4 on the spec, we need to tell craft-parts to pass --ack-unsupported-release when cutting chisel slices.

Thanks, I missed that. Working on it.

[cjdcordeiro]

Cross-referencing chisel's complementary implementation for releases that are EOSS: canonical/chisel#238

[lengau]

Superseded by #946