cmd/go: reject 'get' of paths containing leading dots or unsupported characters

On some platforms, directories beginning with dot are treated as
hidden files, and filenames containing unusual characters can be
confusing for users to manipulate (and delete).

Fixes #29230
Fixes #29231

Change-Id: Ic6f97f577d8fafa83ef62438095a5c7ae022881a
Reviewed-on: https://team-review.git.corp.google.com/c/368507
Reviewed-by: Russ Cox <rsc@google.com>
Reviewed-on: https://go-review.googlesource.com/c/154101
Reviewed-by: Bryan C. Mills <bcmills@google.com>
4 files changed
tree: 0de564bb42c968383eb06cfdfc999c904dd9453f
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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