cmd/go: make 'go get' preserve sums for content of new requirements

This preserves zip sums when 'go get' is run on a module that does not
have a package in the root directory. The zip must be fetched to
determine whether the package should be loaded, so we already load and
verify the sum.

Note that 'go mod tidy' may still remove these sums, since they
aren't needed to load packages.

Fixes #41103

Change-Id: I78f10a25f0392461fdc98518a7c92a38ee3233c3
Reviewed-on: https://go-review.googlesource.com/c/go/+/251880
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
2 files changed
tree: 8632138198f7a5fdbee7c1fe2d318470f7605d77
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. SECURITY.md
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
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