GopherCon work on govendor importer

[kyleconroy]

TODO:

• Figure out what the tree option does
• Generate a Gopkg.lock file
• Contemplate Version in the constraints (@kyleconroy)
• Add vendor.json files to testdata for unit test
• Write unit tests
• Write integration tests (@brendan-munro)
• Add support for rootPath top level property
• Add support for ignores top level property

PR:
golang#815

[rfay]

govendor spec: https://github.com/kardianos/vendor-spec

[joeygoode]

It seems like we don't need to muck with rootPath. Govendor only appears to write to the field and never use it.

$ git grep RootPath
context/vendorFile.go:  ctx.VendorFile.RootPath = ctx.RootImportPath
doc/implementation.md: - [x] Add RootPath (rootPath) to vendor.json file.
vendorfile/file.go:     RootPath string // Import path of vendor folder
vendorfile/file.go:     setField(&vf.RootPath, vf.all, rootPathNames)
vendorfile/file.go:     setObject(vf.RootPath, vf.all, rootPathNames, true)

[kyleconroy]

After talking to the maintainers, we're going to set the manifest constraint to gps.Any() and the lockfile constraint to the revision.

[joeygoode]

Looks like we're ignoring "origin" when a version isn't set. We should properly set this in the manifest, even when there is only a revision hash.

[brendan-munro]

I'm working through converting the edge cases available into integration test cases. One has been merged in to allow a bug to be tested (and fixed), the rest will get merged in when complete.

[otoolec]

Adding some unit tests and will look into how we can fix that 'origin' issue