cmd/go: fix recognition of Fossil checkout directories

Use ".fslckout" or "_FOSSIL_" files to correctly identify the root of
Fossil checkout directories.

Previously, Go has assumed VCS checkouts are indicated by a dot-file
named after the VCS command (eg, .git, .hg, .fossil). This is not
normally true for Fossil, but has worked so far since Go downloads
repositories into a ".fossil" file before opening (checking out).

Using the incorrect path prevents Go identifying Fossil checkouts and
correctly tagging with -buildvcs (to be added in a follow up CL).

Change-Id: I3c030a0b600dfe7f4b3fcf1551b1d7cb84629b81
Reviewed-on: https://go-review.googlesource.com/c/go/+/357954
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
2 files changed
tree: f14dda197ec38855ae65efc03693ceef5096977c
  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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