Understanding the output of "go get"

[Joshua Humphries]

Hello, fellow Gophers!

I have some code for which "go get -t -v" is suddenly failing for Go 1.6, complaining about a reference to the "context" package (added in 1.7).

I haven't changed any of my imports, so this means a dependency has been updated to suddenly require Go 1.7. I'm trying to figure out which package that is, and the output of "go get" doesn't seem to help much.

I develop on a Mac with OS X Sierra, so I sadly cannot really use Go 1.6 to troubleshoot in my local environment (the failing Go 1.6 build is running in Travis.) What I have tried is cleaning out my GOPATH and running the same "go get" command. Since I am running Go 1.7, it succeeds of course.

But I then used the godepgraph tool to figure out what was referencing the context package. And nothing was, except for golang.org/x/net/context (which does so conditionally, and would not depend on it in a Go 1.6 environment). So I'm back to square one at figuring out which package is suddenly Go 1.6-averse.

So if anyone has advice or other strategies for pinpointing my problematic dependency, I would be grateful. I am certain that "go get" has the information I seek -- it just doesn't print it out, even with the "-v" flag.

For reference, here's the output of "go get". Based on lines around the error message, I guessed it may have been golang.org/x/text/unicode/norm, but I don't see any imports of "context" in that package:

github.com/golang/protobuf (download)

Fetching https://golang.org/x/net/context?go-get=1

Parsing meta tags from https://golang.org/x/net/context?go-get=1 (status code 200)

get "golang.org/x/net/context": found meta tag main.metaImport{Prefix:"golang.org/x/net", VCS:"git", RepoRoot:"https://go.googlesource.com/net"} at https://golang.org/x/net/context?go-get=1

get "golang.org/x/net/context": verifying non-authoritative meta tag

Fetching https://golang.org/x/net?go-get=1

Parsing meta tags from https://golang.org/x/net?go-get=1 (status code 200)

golang.org/x/net (download)

Fetching https://google.golang.org/grpc?go-get=1

Parsing meta tags from https://google.golang.org/grpc?go-get=1 (status code 200)

get "google.golang.org/grpc": found meta tag main.metaImport{Prefix:"google.golang.org/grpc", VCS:"git", RepoRoot:"https://github.com/grpc/grpc-go"} at https://google.golang.org/grpc?go-get=1

google.golang.org/grpc (download)

Fetching https://golang.org/x/text/secure/bidirule?go-get=1

Parsing meta tags from https://golang.org/x/text/secure/bidirule?go-get=1 (status code 200)

get "golang.org/x/text/secure/bidirule": found meta tag main.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at https://golang.org/x/text/secure/bidirule?go-get=1

get "golang.org/x/text/secure/bidirule": verifying non-authoritative meta tag

Fetching https://golang.org/x/text?go-get=1

Parsing meta tags from https://golang.org/x/text?go-get=1 (status code 200)

golang.org/x/text (download)

Fetching https://golang.org/x/text/unicode/norm?go-get=1

Parsing meta tags from https://golang.org/x/text/unicode/norm?go-get=1 (status code 200)

get "golang.org/x/text/unicode/norm": found meta tag main.metaImport{Prefix:"golang.org/x/text", VCS:"git", RepoRoot:"https://go.googlesource.com/text"} at https://golang.org/x/text/unicode/norm?go-get=1

get "golang.org/x/text/unicode/norm": verifying non-authoritative meta tag

package context: unrecognized import path "context" (import path does not begin with hostname)

Fetching https://google.golang.org/genproto/googleapis/rpc/status?go-get=1

Parsing meta tags from https://google.golang.org/genproto/googleapis/rpc/status?go-get=1 (status code 200)

get "google.golang.org/genproto/googleapis/rpc/status": found meta tag main.metaImport{Prefix:"google.golang.org/genproto", VCS:"git", RepoRoot:"https://github.com/google/go-genproto"} at https://google.golang.org/genproto/googleapis/rpc/status?go-get=1

get "google.golang.org/genproto/googleapis/rpc/status": verifying non-authoritative meta tag

Fetching https://google.golang.org/genproto?go-get=1

Parsing meta tags from https://google.golang.org/genproto?go-get=1 (status code 200)

google.golang.org/genproto (download)

[David Peacock]

On Sat, Apr 22, 2017 at 7:54 AM, Joshua Humphries <jh...@bluegosling.com> wrote:

I have some code for which "go get -t -v" is suddenly failing for Go 1.6, complaining about a reference to the "context" package (added in 1.7).

I haven't changed any of my imports, so this means a dependency has been updated to suddenly require Go 1.7. I'm trying to figure out which package that is, and the output of "go get" doesn't seem to help much.

I develop on a Mac with OS X Sierra, so I sadly cannot really use Go 1.6 to troubleshoot in my local environment (the failing Go 1.6 build is running in Travis.) What I have tried is cleaning out my GOPATH and running the same "go get" command. Since I am running Go 1.7, it succeeds of course.

Have you tried `go get -u` to attempt an automatic update of the imports?  Is that available in 1.6?

[Joshua Humphries]

I did indeed try that. Same result as wiping everything from my GOPATH (except the source I am immediately working on) and doing a normal "go get ...".