eb982727e3
mvs.Downgrade is pretty clearly intended to match Algorithm 4 from the MVS blog post (https://research.swtch.com/vgo-mvs#algorithm_4). Per the blog post: “Downgrading one module may require downgrading other modules, but we want to downgrade as few other modules as possible. … To avoid an unnecessary downgrade to E 1.1, we must also add a new requirement on E 1.2. We can apply Algorithm R to find the minimal set of new requirements to write to go.mod.” mvs.Downgrade does not match that behavior today: it fails to retain the selected versions of transitive dependencies that are not implied by downgraded direct dependencies of the target (module E in the post). This bug is currently masked by the fact that we only call Downgrade today with a *modload.mvsReqs, for which the Required method happens to return the complete build list — rather than only the direct dependencies as documented for the mvs.Reqs interface. For #36460 Change-Id: If9c8f413b156b5f67c02787d9359394e169951b0 Reviewed-on: https://go-review.googlesource.com/c/go/+/287633 Trust: Bryan C. Mills <bcmills@google.com> Reviewed-by: Michael Matloob <matloob@golang.org> Reviewed-by: Jay Conrod <jayconrod@google.com> |
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