internal/fetch: fs getter: check for .zip

In the module cache, some directories have .info and .mod files but no
.zip, because the go command doesn't need it. We can't display these
modules without the zip. So return NotFound for these modules, even
for Info and Mod.

Also, return derrors.NotFound any time we can't find a file.

Also, rename fsModuleGetter to fsProxyModuleGetter to make it clear
that the filesystem has to be organized like the proxy protocol.

For golang/go#47834

Change-Id: Ia7d6260abc91a6172820d9de6bf759567720a443
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/344389
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
4 files changed
tree: 89ad3c70d9c04165a321db244480dc1ea923ad40
  1. cmd/
  2. devtools/
  3. doc/
  4. internal/
  5. migrations/
  6. static/
  7. tests/
  8. third_party/
  9. .dockerignore
  10. .eslintignore
  11. .eslintrc.yaml
  12. .gitignore
  13. .prettierignore
  14. .prettierrc.yaml
  15. .stylelintignore
  16. .stylelintrc.yaml
  17. all.bash
  18. cloudbuild.yaml
  19. CONTRIBUTING.md
  20. go.mod
  21. go.sum
  22. jest.config.js
  23. LICENSE
  24. package-lock.json
  25. package.json
  26. PATENTS
  27. README.md
  28. tsconfig.json
README.md

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