override requirements in conan install

See original GitHub issue

In the docs you explain requirement overriding. I guess that can be used to handle diamond dependency conflicts. You force existing packages to use different versions of their requirements.

But what if a library needs to be rebuilt to correctly use different versions of its requirements? We would need to create different packages of that library. We can handle that by adding an option and using conditional requirements in the conanfile. Wouldn’t it be nice to be able to override the requirements the same way you override options and settings in the conan install command? Someting like:

conan install . --requires="LibA/0.1@demo/testing"

Issue Analytics

State:
Created 6 years ago
Reactions:14
Comments:33 (16 by maintainers)

Top GitHub Comments

3reactions

liesercommented, Jul 12, 2021

I would say that overriding without validating fits our use case better. We would e.g. like to overwrite a version of dep/1.0.0@user/stable or dep/[^1.0.0]@user/stable with dep/1.1.0@user/stable or dep/master@user/testing.

2reactions

memshardedcommented, Jul 19, 2021

Yes, the override is hard, as long as the package name is the same, the rest of the reference will be overriden.

For transitive dependencies, A depends on B and C and B depends on C, if C is overrrided, when B is rebuilt it needs to take the overridden C as well.

It also applies to transitive dependencies, yes, once a version is overriden it is overriden for the graph, not only for the declaring override consumer.

Also, the export triggers the “requirement” hook that I use to simulate this override, so we need to carry the wanted override as well.

Not sure what is the requirement hook (https://docs.conan.io/en/latest/reference/hooks.html#hooks-reference), so can’t say about this.

basically after a Conan install with override, whatever happen, whatever range protection, we need to use the overridden lib in every case.

Yes, this is the behavior 👍

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