bootstrap fails to honor config for agent-version

[Richard Harding]

From the juju bootstrap --help

Examples
    ...
    juju bootstrap --config agent-version=1.25.3 aws joe-us-east-1

When I attempt to do this with an RC2 client:

    juju bootstrap --config agent-version=2.1.3 aws upgrade
    Creating Juju controller "upgrade" on aws/us-east-1
    Looking for packaged Juju agent version 2.2-rc1 for amd64

It does not function. I've verfied after bootstrap:

    juju controllers
    upgrade* default admin superuser aws/us-east-1 2 1 none 2.2-rc1

I'd like to bootstrap a 2.1.3 so that I can test and write directions around upgrading using juju migrate. I'm not able to do that from the single client as I'd expected to be able to.

[Richard Harding (rharding)]

In checking this out there's the --agent-version flag on bootstrap itself:

    juju bootstrap --agent-version=2.1.3 aws upgradeneeded
    ERROR requested agent version major.minor mismatch

I'm guessing this is saying that my 2.2-rc1 is not able to request agents from 2.1.3?

[John A Meinel (jameinel)]

We need to update the help text, because I'm pretty sure it is "juju bootstrap --agent-version X" rather than "--config" at this point.

As for RC vs Stable, we still have the bug where if you're using a 'devel' version (anything with an 'rc/beta/etc' then it only sees beta agents as targets for deploy).

Also for *bootstrap* people have generally pushed pretty hard that we have to bootstrap the exact version as the client, and then possibly 'upgrade' to the requested version. And since you're using a newer client, we probably wouldn't let you downgrade the controller anyway.
(For example, 2.2 breaks bootstrap wrt 2.1 because it added a new mandatory field, so a 2.1 client couldn't bootstrap a 2.2 agent anyway, you have to go through the upgrade step.)

I think the docs we could fix, actually selecting the agent version is a bit trickier to support in all cases.

Generally within .patch versions, we could probably do it, but major.minor is probably not ever really supported.

[Anastasia (anastasia-macmood)]

The problem is the a client can only bootstrap using its own major.minor versions. So, a 2.1 client can only bootstrap 2.1.x agents; 2.2 can only bootstrap 2.2.x agents, etc.

I have updated the error message at bootstrap: https://github.com/juju/juju/pull/7911