Important - proposed Juju plugin change

[Marco Ceppi]

+1 from me, I'll make the change in the only plugin to reflect this. Thanks
for the heads up!


On Wed, Jul 31, 2013 at 9:34 PM, Mark Mims <mark.mims at canonical.com> wrote:

> +1... ok with plugins parsimg everything they need and/or taking
> responsibility to pass them along to actual subcommands.
>
> -- (mobile)
> Mark Mims, Ph.D.
> Ubuntu Server Team
> Canonical Ltd
> mark.mims at canonical.com
> +1(512)981-6467
>
> On Jul 31, 2013, at 15:27, Ian Booth <ian.booth at canonical.com> wrote:
>
> > Sending to you guys directly as well....
> >
> >
> > -------- Original Message --------
> > Subject: Important - proposed Juju plugin change
> > Date: Thu, 01 Aug 2013 11:19:16 +1000
> > From: Ian Booth <ian.booth at canonical.com>
> > To: juju-dev at lists.ubuntu.com <Juju-dev at lists.ubuntu.com>
> >
> > Hi folks
> >
> > Juju processes arguments used when calling a plugin, acting on common
> things;
> > the main one is using -e to set the environment. However, this means
> plugins
> > require the use of "--" to receive any additional arguments. eg
> >
> > juju myplugin -e myenv -- -pluginarg
> >
> > The above would set JUJU_ENV to myenv and pass -pluginarg to the plugin.
> >
> > This is kinda conceptually messy for the end user, having to know to use
> "--".
> > And it's now made worse by the fact that the new simplestreams tools
> plugins
> > which ship with Juju do not require "--" since they are built on top of
> Juju
> > command infrastructure. So this works:
> >
> > juju metadata validate-images -e myenv -s raring
> >
> > If it were an "external" plugin, it would need to be:
> >
> > juju metadata validate-images -e myenv -- -s raring
> >
> > What we are proposing is to drop the "--". However, this means that:
> >
> > - plugins are responsible for processing *all* of their own arguments
> > - common Juju arguments like "-e" are no longer automatically processed
> >
> > So if a plugin is called with "-e myenv", it will need to parse the -e
> itself
> > and set JUJU_ENV and not count on it being done by Juju. Or course, if
> the
> > plugin is written in Go, it can always use the built in parsing just
> like the
> > simplestreams metadata plugin does.
> >
> > Can I please have feedback from anyone who has written a Juju plugin who
> would
> > find the above change problematic? Users of plugins would just need to
> tweak any
> > scripts which call them to remove the "--".
> >
> >
> >
> > --
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> >
> >
>
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