Re: [BuildStream] Proposal: bst artifact subcommand group

[Chandan Singh <chandan chandansingh net>]

Hi Richard,

On Wed, Nov 28, 2018 at 12:40 PM Richard Maw via BuildStream-list
<buildstream-list gnome org> wrote:
> On Tue, Jul 24, 2018 at 07:48:33PM +0900, Tristan Van Berkom via Buildstream-list wrote:
> > Beyond this:
> >
> >   o It will be interesting to allow artifact operations to specify
> >     elements instead of artifact names, for the cases where you just
> >     want to use the artifact who's cache key corresponds to the project
> >     state.
>
> This is easy, it's just a matter of loading the element
> and asking the cache what ref it would be.
>
> >   o It would also be interesting to move `checkout`, `push` and `pull`
> >     commands under the new `artifact` group (deprecating the existing
> >     commands).
> >
> >     This will open up the door to performing checkouts etc at the
> >     artifact level instead of only supporting the artifacts who's
> >     cache keys correspond to the project state.
>
> This is less easy.
>
> To not duplicate the logic we need to either turn our Artifacts into "Elements",
> or re-architect to expose interfaces that operate on Artifacts
> and handle Elements by turning them into Artifacts first.
>
> I looked at turning Artifacts into "Elements",
> which could be done with custom Project and Loader classes,
> but it looks to be more work than I've time for before 1.4.
>
> If `bst checkout` is going to be deprecated in 1.4
> you won't be able to use the options for running integration commands
> or whether to include dependencies when specifying an element name.

I am slightly confused by this, i.e. why wouldn't it be possible to
specify the dependencies of an element when working with element
names?

Shouldn't it be possible to load the element first, figure out the
list of dependencies involved, calculate the cache keys for them, and
then checkout all those artifacts? Or maybe I misunderstood
something...

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Cheers,
Chandan