[isolated] Follow symbolic links in directories.

Bug: 917604
Test: The following was done
```
mkdir a
echo 'foo' > a/srcf
mkdir a/srcdir
echo 'bar' > a/srcdir/f
mkdir b
echo 'baz' > b/intreesrc
ln -s ../a/srcf b/linkf
ln -s ../a/srcdir b/linkdir
ln -s intreesrc b/intreelink

isolated archive -I https://isolateserver.appspot.com -namespace default-gzip -dirs $CWD:b
```
At HEAD: https://isolateserver.appspot.com/browse?namespace=default-gzip&digest=f5f3a5991eab03d049d8eda6ed49ef393c46e7ec
With this change: https://isolateserver.appspot.com/browse?namespace=default-gzip&digest=711b1dd90aa45ccb53fc5ebec86c2d37b40c914a

Change-Id: I4b11c9c079f95e43e5c5f5b80ebeaa84b5af7307
Reviewed-on: https://chromium-review.googlesource.com/c/1390262
Commit-Queue: Joshua Seaton <joshuaseaton@google.com>
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
3 files changed
tree: 6bfd10efeffd8d297c79b07544e091ee0665c454
  1. appengine/
  2. auth/
  3. buildbucket/
  4. cipd/
  5. client/
  6. common/
  7. config/
  8. cq/
  9. dm/
  10. examples/
  11. gce/
  12. grpc/
  13. hardcoded/
  14. infra/
  15. logdog/
  16. luci_notify/
  17. lucicfg/
  18. lucictx/
  19. machine-db/
  20. milo/
  21. mmutex/
  22. mp/
  23. scheduler/
  24. scripts/
  25. server/
  26. starlark/
  27. tokenserver/
  28. tools/
  29. tumble/
  30. vpython/
  31. web/
  32. .gitattributes
  33. .travis.yml
  34. AUTHORS
  35. codereview.settings
  36. CONTRIBUTING.md
  37. CONTRIBUTORS
  38. LICENSE
  39. OWNERS
  40. pre-commit-go.yml
  41. PRESUBMIT.py
  42. README.md
README.md

luci-go: LUCI services and tools in Go

GoDoc

Installing

LUCI Go code is meant to be worked on from an Chromium infra.git checkout, which enforces packages versions and Go toolchain version. First get fetch via depot_tools.git then run:

fetch infra
cd infra/go
eval `./env.py`
cd src/go.chromium.org/luci

Contributing

Contributing uses the same flow as Chromium contributions.