boot-resources start-import should re-start importing when changing boot-source configuration

[Gábor Mészáros]

Following up on #1876161, I have been directed to file a bug for MaaS.

In FCE deployment, when changing the bootsources from the default "http://images.maas.io/ephemeral-v3/daily", it might still trying to fetch the bootsources from that url. And running that in an airgapped environment can have even worse consequences.

It should cancel import when changing (maas boot-resources stop-import), when changing the boot sources (eg. with maas boot-source update 1 url="http://offline.repo/maas/" and re-initiate it with the updated config.

[Gábor Mészáros (gabor.meszaros)]

https://discourse.maas.io/t/boot-resources-start-import-should-re-start-importing-when-changing-boot-source-configuration/1534

[Alberto Donato (ack)]

When updating boot resources configuration, a new importer run is scheduled, but current pending runs are not stopped, while they should.

[Jerzy Husakowski (jhusakowski)]

The workaround is for the user to manually stop import via the CLI or API. This issue will be picked up with MAAS image storage improvements, timeline unknown at the moment.

[Jerzy Husakowski (jhusakowski)]

This issue is added to the internal backlog, to be taken up with MAAS image storage/distribution improvements (internal reference PF-3227). This issue is marked as "won't fix" because we are planning to overhaul the image storage and distribution subsystem, and this particular scenario is unlikely to occur there.