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Bryan C. Mills 817afe8357 cmd/go: adjust heuristics for skipping +incompatible versions
We know of at least one module (github.com/stripe/stripe-go) that has
a run of +incompatible versions, followed by a run of versions with
go.mod files, followed by another run of +incompatible versions.

We want the heuristics for showing +incompatible versions to reflect
the authors' current intent, and it seems clear that the current
intent of the authors of that module is for users of the unversioned
import path to still be on +incompatible versions.

To respect that intent, we need to keep checking for +incompatible
versions even after we have seen a lower major version with an
explicit go.mod file.

However, we still don't want to download every single version of the
module to check it. A given major version should have a consistent,
canonical import path, so the path (as inferred by the presence or
absence of a go.mod file) should be the same for every release across
that major version.

To avoid unnecessary overhead — and to allow module authors to correct
accidental changes to a major version's import path — we check only
the most recent release of each major version. If a release
accidentally changes the import path in either direction (by deleting
or adding a go.mod file), it can be corrected by issuing a single
subsequent release of that major version to restore the correct path.

I manually verified that, with this change,
github.com/stripe/stripe-go@latest reverts to v68.7.0+incompatible
as it was in Go 1.13.
The other regression tests for #34165 continue to pass.

Updates #34165

Change-Id: I5daff3cd2123f94c7c49519babf4eecd509f169e
Reviewed-on: https://go-review.googlesource.com/c/go/+/212317
Reviewed-by: Jay Conrod <jayconrod@google.com>
2020-01-08 20:07:45 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api go/build: rename WorkingDir to Dir 2019-12-17 14:59:30 +00:00
doc doc: document atexit_sleep_ms flag in race_detector 2020-01-03 23:49:42 +00:00
lib/time lib/time: update tz data to 2019c 2019-11-26 12:03:08 +00:00
misc misc/cgo/test: tweak to pass with GCC 10 2019-12-20 20:12:18 +00:00
src cmd/go: adjust heuristics for skipping +incompatible versions 2020-01-08 20:07:45 +00:00
test cmd/compile: give every really deep type a unique name 2020-01-08 18:43:55 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: update email address for utkarsh-extc 2019-10-03 12:39:06 +00:00
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README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
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