[feature] Add --recipe-only flag to conan export command

When using in-source recipes and the total size of the exported sources is very large, the conan export command takes a long time, and this can be highly problematic is some development workflows (such as mono-repo for example). This problem could be solved by adding a flag to conan export such as --recipe-only, which simply copies only the conanfile to the local cache.

• I’ve read the CONTRIBUTING guide.

[jgsogo]

I see two possible problems here:

• the recipe revision depends on the exported files, if they are not exported we cannot compute the revision
• after exporting a recipe, it can be uploaded to a remote. If we export without everything required we might end up with broken recipes in a server.

[memsharded]

So, to clarify, the estimated negative impact of the current performance is not substantial enough to warrant us working on an improvement. Is that accurate?

Yes, accurate

But, we should clarify that even if this potential inconsistency was eliminated, we still would not support the development of this feature. Is that also correct?

It is not very evident to me how this inconsistency could be eliminated. But yes, I don’t perceive a big pain in this. We can close by now, and we can always check with the Tribe 2.0 once is launched.