Module rename has broken indirectly golangci-lint

[XoseRamon]

Your latest commit s/Quasilyte/quasilyte might have broken projects that reference indirectly (maybe even directly, not sure) go-consistent since go mod is case-sensitive and checks the paths (see this issue).

I am not sure if this is the right place to report it, but since it is the source of the error, I just wanted to warn you in case it is an unexpected side effect. The dependency chain is golangci-lint -> go-critic -> go-consistent.

To reproduce:

GO111MODULE=on go get -u github.com/golangci/golangci-lint/cmd/golangci-lint@master              
go: finding github.com/golangci/golangci-lint/cmd/golangci-lint master                                                                      
go: finding github.com/golangci/golangci-lint/cmd master                                                                                    
go: finding github.com/golangci/golangci-lint master                                                                                        
go: finding github.com/golangci/goconst latest
...
 go: finding github.com/golangci/unconvert latest
go: github.com/Quasilyte/go-consistent@v0.0.0-20190521200055-c6f3937de18c: parsing go.mod: unexpected module path "github.com/quasilyte/go-consistent"
go: finding github.com/logrusorgru/aurora latest
go: finding gopkg.in/tomb.v1 latest
go: finding github.com/StackExchange/wmi latest
go get: error loading module requirements     

[quasilyte]

Hmm, I think go-consistent is only used in ci for go-critic. It shouldn't be a first-class dependency. I'll take a look, thanks.

[mec07]

I'm having the same problem... 😢

[mec07]

I've found a solution, it's not super satisfactory, but seems to work in circleci:
go get github.com/golangci/golangci-lint/cmd/golangci-lint@de1d1ad
It came from this: golang/go#31148

[quasilyte]

See the referenced commit. Should help to resolve the problem.

[mec07]

Thanks for this. I tried it out again to see if the issue was resolved by your commit, but it's still happening...

go: github.com/Quasilyte/go-consistent@v0.0.0-20190521200055-c6f3937de18c: parsing go.mod: unexpected module path "github.com/quasilyte/go-consistent"

So I'm sticking with the suboptimal solution for now:

go get github.com/golangci/golangci-lint/cmd/golangci-lint@de1d1ad

[thepudds]

@quasilyte When modules are enabled, the go tool enforces that the module name declared in the module statement on the first line of the go.mod matches the import path used by consumers.

Is it necessary to change the case for the import path for github.com/Quasilyte/go-consistent?

Changes like that are breaking changes. They can end up having wide repercussions across the ecosystem.

For example, Sirupsen/logrus vs. sirupsen/logrus has caused a large amount of churn (see for example golang/go#28489). A similar but slightly different example is golang.org/x/lint vs. github.com/golang/lint (e.g., golang/lint#436 and golang/go#30831), where the ecosystem was using two different import paths and introducing a canonical name in the go.mod caused problems for many consumers.

golangci-lint happens to be having other issues now (including due to a change in x/tools/go/packages), but would be good if this rename here could be avoided?

CC @dmitshur @matloob

[quasilyte]

go-consistent is not a library and the reason it end up in a dep tree is https://github.com/go-critic/go-critic/blob/master/tools.go. I don't like that a tool that is used during ci tests of go-critic is a dependency of golangci-lint. This is the problem, not the import path, it shouldn't be a dependency on the first place.

[quasilyte]

And now import path should match. I've done the renaming in go-critic.

[thepudds]

Hi @quasilyte, With the change you made in go-critic, do upgrades end up working for you?

For example, if I do:

cd $(mktemp -d)
go mod init tempmod
go get -m github.com/go-critic/go-critic@f6f702b31734df2
go get -u

It fails during the upgrade step with:

go: finding github.com/Quasilyte/go-consistent latest
go: github.com/Quasilyte/go-consistent@v0.0.0-20190521200055-c6f3937de18c: 
parsing go.mod: unexpected module path "github.com/quasilyte/go-consistent"
go: finding github.com/logrusorgru/aurora latest
go: finding golang.org/x/tools latest
go get: error loading module requirements

[thepudds]

That was a synthetic example intended to show the problem more clearly, but here is closer to a real example:

cd $(mktemp -d)
go mod init tempmod
go get github.com/golangci/golangci-lint@master
go get -u

which fails during the upgrade step with:

...
go: github.com/Quasilyte/go-consistent@v0.0.0-20190521200055-c6f3937de18c: 
parsing go.mod: unexpected module path "github.com/quasilyte/go-consistent"
go get: error loading module requirements

[quasilyte]

go get -m github.com/go-critic/go-critic@f6f702b31734df2

Do you get the revision prior to the fix intentionally?

golangci-lint probably uses gocritic version prior to the fix as well. So it needs to be updated. But all that is an issue only if you're using unreleased versions, I think.