Protobuf repo as a dependency

[amineck]

Hi,

I have a project with github.com/google/openrtb as a dependency and I'm using go generate to generate go code from the protobuf files. I was wondering what's the best solution to handle these kind of dependencies with dep?

Here is the output I receive:

dep ensure github.com/google/openrtb
ensure Solve(): No versions of github.com/google/openrtb met constraints:
	1.4.1: Could not introduce github.com/google/openrtb@1.4.1, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.4.0: Could not introduce github.com/google/openrtb@1.4.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.3.0: Could not introduce github.com/google/openrtb@1.3.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.2.2: Could not introduce github.com/google/openrtb@1.2.2, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.2.1: Could not introduce github.com/google/openrtb@1.2.1, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.2.0: Could not introduce github.com/google/openrtb@1.2.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.1.0: Could not introduce github.com/google/openrtb@1.1.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.0.5: Could not introduce github.com/google/openrtb@1.0.5, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.0.4: Could not introduce github.com/google/openrtb@1.0.4, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.0.3: Could not introduce github.com/google/openrtb@1.0.3, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.0.2: Could not introduce github.com/google/openrtb@1.0.2, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.0.1: Could not introduce github.com/google/openrtb@1.0.1, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	1.0.0: Could not introduce github.com/google/openrtb@1.0.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.8: Could not introduce github.com/google/openrtb@0.9.8, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.7: Could not introduce github.com/google/openrtb@0.9.7, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.6: Could not introduce github.com/google/openrtb@0.9.6, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.5: Could not introduce github.com/google/openrtb@0.9.5, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.4: Could not introduce github.com/google/openrtb@0.9.4, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.3: Could not introduce github.com/google/openrtb@0.9.3, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.2: Could not introduce github.com/google/openrtb@0.9.2, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.1: Could not introduce github.com/google/openrtb@0.9.1, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.9.0: Could not introduce github.com/google/openrtb@0.9.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.6: Could not introduce github.com/google/openrtb@0.8.6, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.5: Could not introduce github.com/google/openrtb@0.8.5, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.4: Could not introduce github.com/google/openrtb@0.8.4, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.3: Could not introduce github.com/google/openrtb@0.8.3, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.2: Could not introduce github.com/google/openrtb@0.8.2, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.1: Could not introduce github.com/google/openrtb@0.8.1, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.0: Could not introduce github.com/google/openrtb@0.8.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.7.3: Could not introduce github.com/google/openrtb@0.7.3, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.7.2: Could not introduce github.com/google/openrtb@0.7.2, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.7.1: Could not introduce github.com/google/openrtb@0.7.1, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.7.0: Could not introduce github.com/google/openrtb@0.7.0, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.6.6: Could not introduce github.com/google/openrtb@0.6.6, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.6.5: Could not introduce github.com/google/openrtb@0.6.5, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.6.4: Could not introduce github.com/google/openrtb@0.6.4, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.6.3: Could not introduce github.com/google/openrtb@0.6.3, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.6.2: Could not introduce github.com/google/openrtb@0.6.2, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.6.1: Could not introduce github.com/google/openrtb@0.6.1, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.6: Could not introduce github.com/google/openrtb@0.6, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.0-beta4: Could not introduce github.com/google/openrtb@0.8.0-beta4, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.0-beta3: Could not introduce github.com/google/openrtb@0.8.0-beta3, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.0-beta2: Could not introduce github.com/google/openrtb@0.8.0-beta2, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	0.8.0-beta: Could not introduce github.com/google/openrtb@0.8.0-beta, as its subpackage github.com/google/openrtb/openrtb-core/src/main/protobuf does not contain usable Go code (*build.NoGoError).. (Package is required by (root).)
	master: Could not introduce github.com/google/openrtb@master, as it is not allowed by constraint * from project districtm.ca/go-data/testrand.
	compat: Could not introduce github.com/google/openrtb@compat, as it is not allowed by constraint * from project districtm.ca/go-data/testrand.
	1.0.4.compat: Could not introduce github.com/google/openrtb@1.0.4.compat, as it is not allowed by constraint * from project districtm.ca/go-data/testrand.
	1.0.5.compat: Could not introduce github.com/google/openrtb@1.0.5.compat, as it is not allowed by constraint * from project districtm.ca/go-data/testrand.
	1.1.0.compat: Could not introduce github.com/google/openrtb@1.1.0.compat, as it is not allowed by constraint * from project districtm.ca/go-data/testrand.

Thank you.

[sdboyer]

hi, welcome, thanks for the issue!

so, code generation is one of the stickier areas with dep. we don't support any kind of arbitrary code evaluation; the closest thing to a discussion of it has been in #269, pursuant to cgo. for code generation, at least, this is in keeping with how the Go team originally outlined the ideas behind e.g. go generate - that's something that the publisher is supposed to do, not the consumer.

for this particular case, i'd probably take the approach of creating a repository that's derived from github.com/google/openrtb by creating some automation that go generates the protobuf you need, commits and pushes the results.

[amineck]

Sounds reasonable to me. Thank you very much for your time :)