bootstrapping juju installs 'core' but 'juju-db' depends on 'core18'

[John A Meinel]

I was debugging time to 'snap install juju-db' in fresh containers, and I was surprised that 'snap install juju-db' was faster than 'snap install core; snap install juju-db'.

This is because in Focal images, 'core18' is there by default, and juju-db itself doesn't depend on 'core' but only depends on 'core18'.

So we are wasting a significant amount of disk space and download time installing the 'core' snap that isn't even needed.

We should either only target 'juju-db' in which case it will pull down whatever base it needs, or update our code to install core18 rather than core.

[Simon Richardson (simonrichardson)]

I'll tackle this when refactoring snap install retries and remove core from the install commands.

[John A Meinel (jameinel)]

Note that one thing we *do* use the 'core' snap for is for proxy settings:
2021-03-09 22:17:39 DEBUG juju.worker.proxyupdater proxyupdater.go:279 snap core settings [proxy.http=http://squid.internal:3128/ proxy.https=http://squid.internal:3128/ proxy.store=] updated, output: ""

I don't know if we should be setting those for core18, or if we have to set them for core, or if we can set them for core but not install the core snap.

[John A Meinel (jameinel)]

Searching led me to:
https://askubuntu.com/questions/764610/how-to-install-snap-packages-behind-web-proxy-on-ubuntu-16-04

which seems to say it isn't 'snap set core proxy.http' but:
sudo snap set system proxy.http="http://<proxy_addr>:<proxy_port>"

Which was new in snap 2.28.
It may be we need to switch to 'system' since there are now more than just 'core' and 'core18'.

[Ian Booth (wallyworld)]

Last time I looked, juju-db had to be installed on core18 due to the toolchain and other dependencies. Moving to core is potentially a lot of work.

[John A Meinel (jameinel)]

Sorry, this isn't "we should move to core" this is "we should not be
explicitly installing core" because we don't need it anymore.

On Thu, Mar 18, 2021 at 5:05 PM Ian Booth <email address hidden>
wrote:

> Last time I looked, juju-db had to be installed on core18 due to the
> toolchain and other dependencies. Moving to core is potentially a lot of
> work.
>
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> https://bugs.launchpad.net/bugs/1920033
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> Title:
> bootstrapping juju installs 'core' but 'juju-db' depends on 'core18'
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[Simon Richardson (simonrichardson)]

PR for changes are here https://github.com/juju/juju/pull/12768