How to dynamically pick a git branch to use in Jenkins build

Question

I\'m trying to create a new project configuration for Jenkins build server. To simplify what I\'m trying to do, I will use only two components to describe the problem.

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Answer 1

1 - would adding project B as a sub repo of project A be a possible solution ?

2- (if including the full source code for B should really be avoided) : would pushing builds of B to some B_builds repo, and adding this repo as a sub-repo of A be a possible solution ?

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Rationale : one way to make the dependency between A and B more explicit is to represent it inside the dependencies of the repository.

This would require to add an extra step when managing the A project :

update `B` sub repo in `A` project, and push this to `A`

each time you produce a new version for B.

However, you would have a clear view, from A, about when the versions of B were integrated (e.g : "we only used B 2.0.1 starting from A 4.3.2") , and pushing to A would trigger your usual Jenkins flow.