Allow to fallback to VS Code marketplace for missing packages

[Alikont]

With a lot of package management feeds, it's common to support falling back to upstream feed for missing packages, so you can do all operations with a single feed url.

Service should return local packages if it's available, and fall back to real marketplace if it's not.

[code-asher]

I do not think we can specifically point to the VS Code marketplace for legal reasons.

But, it would be cool to implement a generic fallback so you can specify a different marketplace, like say Open VSX.

[code-asher]

Although I wonder if some kind of caching proxy is a better fit for this use case.

[Alikont]

What I want is to have a single URL that I can configure for people to have both private and public packages

For me it's enough to just proxy it

Yes, a generic "fallback url" is a good config, so it's users who bear legal responsibility

[garylavayou]

Although I wonder if some kind of caching proxy is a better fit for this use case.

@code-asher Maybe some functionality like Nexus repository manager/Docker registry that can act as a proxy of an upstream extension registry (i.e., open-vsx.org). In this way, install extension that requires specific versions will not fail if that version is missing in local marketplace.

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updated: I find that ovsx have implemented the proxy mode (also mirror mode). So, code-marketplace should main serve as an offline service, on which extension can only be added via files.

[code-asher]

I also just learned about https://github.com/LOLINTERNETZ/vscodeoffline

Not an endorsement, I have never used it, but maybe it is worth looking at.