cmd/internal/moddeps: use a temporary directory for GOMODCACHE if needed

CL 328770 should be sufficient to fix the specific failure in the
report, but when attempting to reproduce it I noticed a related
failure mode, triggered by the environment variables set in
src/run.bash.

The failure mode is currently masked on the Go project builders due to
the lack of any 'longtest' builder running as a non-root user
(#10719).

It is also masked from Go contributors running 'run.bash' locally
because 'run.bash' does not actually run all of the tests unless
GO_TEST_SHORT=0 is set in the environment (#29266, #46054).

Fixes #46695

Change-Id: I272c09dae462734590dce59b3d3c5b6d3f733c92
Reviewed-on: https://go-review.googlesource.com/c/go/+/328771
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
1 file changed
tree: d2dbeee69226d81561bf3830662df79074ffed37
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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