Hub: Connector download need better error message if arch is not present

[sehz]

trafficstars

Error message when connector arch is not present: fluvio hub connector download infinyon/[email protected] Using hub https://hub.infinyon.cloud downloading infinyon/[email protected] to infinyon-duckdb-sink-0.1.0.ipkg Hub error: downloading infinyon/[email protected] failed Server: Downloading package Status(404

This should be something like:

Connector infinyon/[email protected] is not available for target `aarch64-unknown-linux-musl`. 
 However following targets are available:
     - X86-64-unknown-linux-musl.

[solidiquis]

So the server response for this one doesn't provide enough granularity to distinguish between say a misnamed package vs. a package that doesn't support a particular platform. Example:

$ fluvio hub connector download infinyon/[email protected]

and

$ fluvio hub connector download --target i686-pc-windows-gnu infinyon/[email protected]

So simply returning available targets might mislead folks when the error is a simple misspelling.

I see a few ways to go about this:

1. Make the error status from the server be a bit more granular, as in, distinguish between an unsupported platform vs. an actual 404 (say a misspelling) so that the CLI can provide the appropriate error message.
2. Retrieve all available packages for various platforms first, cross check that with the target, then proceed or error. This of course costs an extra network call.
3. Make a more general error message.

I don't believe that the codebase for the API is public so I wouldn't be able to do 1 without some help. If we go route 2, it would be of tremendous help if I could get some direction on how to query packages for a particular platform. If we go route 3, I'm open to suggestions on what the more general error message should be. I'm happy to provide a suggestion as well.

edit: Relevant piece of code

[digikata]

This is a solid assessment. Our package servers already have an index of all the packages already on the server side, so a hybrid of 1 and 2 would be to add a new endpoint (e.g. "connector/pkginfo") to return information about a particular package versions and supported arches.

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