Repeating constraints does not combine values

[Peter Jose De Sousa]

Hello

When repeating --constraints arguments during a machine bootstrap, the preceding constraint argument values are lost whilst the last argument is preserved.

This is misleading as no error or warning is given to the user to make them aware.

This bug is to document this issue

Thanks,

Peter

[Joseph Phillips (manadart)]

This might be as simple as using FlagSet.Var over FlagSet.StringVar as we already do for config, which works for multiple-specification as attempted for constraints here.

[John A Meinel (jameinel)]

So you should be able to supply space separated list of constraints, eg:

juju bootstrap --constraints "a=b c=d"

We can look to support multiple arguments so that:
juju bootstrap --constraints "a=b" --constraints "b=c"

also works, but you already *can* supply multiple constraints simultaneously.

[Amanda Hager Lopes de Andrade Katz (amandahla)]

Can I give it a try to this issue?

[Amanda Hager Lopes de Andrade Katz (amandahla)]

Draft
https://github.com/juju/juju/pull/17123