Make support paths option

[izumin5210]

Make protoc-gen-grpc-gateway support paths option such like golang/protobuf#515

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[izumin5210]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

[johanbrandhorst]

Hi @izumin5210, this looks like a great addition! I'm a little bit confused by the build error, looks like the files need to be regenerated, but I don't think your change as anything to do with it. Could you update the commit message to contain the same kind of description that your pull request does please?

[izumin5210]

@johanbrandhorst I fixed the message! 😄

[johanbrandhorst]

@achew22 @tmc what's going on with CI here?

[achew22]

@johanbrandhorst Very strange. We used to have this kind of problem all the time. It was from proto-go being upgraded and changing the output format. When there are no env variables set, we compare the compiled versions of the .pb.go to the version that is checked in for equality (golden testing).

However, with the submission of #696, I wouldn't expect that to happen any more. I don't know a lot about dep unfortunately. I was hoping we could just wait till vgo, but I'm glad we did this. Looking at this line is it possible that we are overriding our go dep and explicitly installing the HEAD version of proto-go?

The other two failures appear to just be standard tooling errors. If we paid for Travis I bet it would be more stable, but the free version is kind of flaky. I re-triggered them and they passed.

[johanbrandhorst]

That line is only installing golint, it shouldn't affect the version of protoc-gen-go.

[achew22]

@johanbrandhorst, I wasn't meaning to imply that line specifically, but is there something in that file you would expect is updating our dependencies to head instead of the vendored versions?

[johanbrandhorst]

No, I cant see how it would do that. I agree I figured itd be fixed by the dependency locking. I guess we'll have to do some more digging.

[achew22]

I fixed it by manually applying the patch. Could you please rebase this PR to see how Travis feels about it now? Thanks!

[izumin5210]

I rebased!

But CI failed again 😢
Could you rerun them?

15.27s$ test "${USE_BAZEL}" = true || go get github.com/golang/lint/golint
package golang.org/x/lint: unrecognized import path "golang.org/x/lint" (https fetch: Get https://golang.org/x/lint?go-get=1: net/http: TLS handshake timeout)
The command "test "${USE_BAZEL}" = true || go get github.com/golang/lint/golint" failed and exited with 1 during .

https://travis-ci.org/grpc-ecosystem/grpc-gateway/jobs/411080943#L557-L561

[johanbrandhorst]

Looks like it's all working again, thanks for your contribution!