Go modules bug

[solher]

When trying to go get go-colorable from gopkg, I'm currently getting this message (using Go 1.12):

go get -u gopkg.in/mattn/go-colorable.v0
go: gopkg.in/mattn/go-colorable.v0@v0.1.1: go.mod has non-....v0 module path "github.com/mattn/go-colorable" at revision v0.1.1
go get: error loading module requirements

It seems to me like there is some kind of conflict between the gopkg.in/mattn/go-colorable.v0 actual package path and the name of the module declared in the go.mod file github.com/mattn/go-colorable.

For now, forcing the use of the lib without the go.mod file in it solves the issue:

go get -u gopkg.in/mattn/go-colorable.v0@v0.1.0
go: finding gopkg.in/mattn/go-colorable.v0 v0.1.0
go: downloading gopkg.in/mattn/go-colorable.v0 v0.1.0
go: extracting gopkg.in/mattn/go-colorable.v0 v0.1.0

[tych0]

FWIW, I've hit this too. For me it's an indirect dep (i.e. the line go is complaining about in go.mod doesn't exist at all; it just exists in go.sum), and it seems your trick doesn't work:

go get -u gopkg.in/mattn/go-colorable.v0@v0.1.1
go: gopkg.in/mattn/go-colorable.v0@v0.1.1: go.mod has non-....v0 module path "github.com/mattn/go-colorable" at revision v0.1.1
go get: error loading module requirements

[tych0]

I filed golang/go#30636, let's see what they say.

[jeanlucmongrain]

same thing with gopkg.in/mattn/go-isatty.v0 not a coincidence...

[directionless]

FWIW the go bugs suggest it's an issue in the go.mod file or versions here, and that you can use a version that predates this issue. Adding an override to go.mod helped.

replace gopkg.in/mattn/go-colorable.v0 => github.com/mattn/go-colorable v0.1.0

replace gopkg.in/mattn/go-isatty.v0 => github.com/mattn/go-isatty v0.0.6

[cmaglie]

Looks like the problem is in the go.mod file that has the wrong import path:

go-colorable/go.mod

Line 1 in 8029fb3

module github.com/mattn/go-colorable

it should be:

 module gopkg.in/mattn/go-colorable.v0 

the same import should be fixed on go-isatty too I think.

[mattn]

I don't use gopkg. So this is not a bug.

[cmaglie]

The problem is with go mod not gopkg.

Here the steps to reproduce:

~/Workspace/test$ go mod init test
go: creating new go.mod: module test

~/Workspace/test$ cat > main.go
package main

import "gopkg.in/mattn/go-colorable.v0"

func main() {
}

~/Workspace/test$ go build
go: downloading gopkg.in/mattn/go-colorable.v0 v0.1.2
build test: cannot load gopkg.in/mattn/go-colorable.v0: cannot find module providing package gopkg.in/mattn/go-colorable.v0

[cmaglie]

ah, now I see what you mean, I must import:

import "github.com/mattn/go-colorable"

instead of:

import "gopkg.in/mattn/go-colorable.v0"

that solved the issue for me.
Thanks!

[azilber]

Having the same issue using with go and vgo.

$ go fmt
go: downloading gopkg.in/mattn/go-colorable.v0 v0.1.2
go: downloading gopkg.in/mattn/go-isatty.v0 v0.0.8
build consultent/noodle-node: cannot find module for path gopkg.in/mattn/go-colorable.v0

I'm not sure why it's trying to get it from gopkg.in. I have
require "github.com/mattn/go-colorable" in both the go file, and go.mod

I'd rather not move my code under $GOPATH/src

EDIT/UPDATE:

The issue is just mod related, setting GO111MODULE=on will create this issue.
I've tried wiping out the cache (using go clean -cache -modcache )
and when doing go fmt I get this:

$ go fmt

go: creating new go.mod: module consultent/noodle-node
go: finding github.com/rburmorrison/go-argue latest
go: finding github.com/mattn/go-isatty v0.0.8
go: finding github.com/keimoon/gore latest
go: finding github.com/mattn/go-runewidth v0.0.4
go: finding github.com/mattn/go-colorable v0.1.2
go: finding github.com/mattn/go-sqlite3 v1.10.0
go: finding github.com/cheggaaa/pb v2.0.6+incompatible
go: downloading github.com/cheggaaa/pb v2.0.6+incompatible
go: extracting github.com/cheggaaa/pb v2.0.6+incompatible
go: downloading github.com/mattn/go-colorable v0.1.2
go: downloading github.com/mattn/go-isatty v0.0.8
go: extracting github.com/mattn/go-colorable v0.1.2
go: extracting github.com/mattn/go-isatty v0.0.8
go: downloading github.com/mattn/go-runewidth v0.0.4
go: downloading github.com/rburmorrison/go-argue v0.0.0-20190107184430-e164876050e3
go: extracting github.com/mattn/go-runewidth v0.0.4
go: extracting github.com/rburmorrison/go-argue v0.0.0-20190107184430-e164876050e3
go: downloading github.com/keimoon/gore v0.0.0-20160317032603-1ac8b93b5fdb
go: extracting github.com/keimoon/gore v0.0.0-20160317032603-1ac8b93b5fdb
go: downloading github.com/mattn/go-sqlite3 v1.10.0
go: extracting github.com/mattn/go-sqlite3 v1.10.0
go: finding golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223
go: finding gopkg.in/fatih/color.v1 v1.7.0
go: finding gopkg.in/mattn/go-runewidth.v0 v0.0.4
go: finding gopkg.in/VividCortex/ewma.v1 v1.1.1
go: finding gopkg.in/mattn/go-colorable.v0 v0.1.2
go: finding gopkg.in/mattn/go-isatty.v0 v0.0.8
go: finding gopkg.in/cheggaaa/pb.v2 v2.0.6
go: downloading gopkg.in/VividCortex/ewma.v1 v1.1.1
go: extracting gopkg.in/VividCortex/ewma.v1 v1.1.1
go: downloading gopkg.in/mattn/go-colorable.v0 v0.1.2
go: downloading gopkg.in/mattn/go-runewidth.v0 v0.0.4
go: extracting gopkg.in/mattn/go-runewidth.v0 v0.0.4
go: downloading gopkg.in/mattn/go-isatty.v0 v0.0.8
go: downloading gopkg.in/cheggaaa/pb.v2 v2.0.6
go: extracting gopkg.in/cheggaaa/pb.v2 v2.0.6
go: downloading gopkg.in/fatih/color.v1 v1.7.0
go: extracting gopkg.in/fatih/color.v1 v1.7.0
build consultent/noodle-node: cannot load gopkg.in/mattn/go-colorable.v0: cannot find module providing package gopkg.in/mattn/go-colorable.v0

It seems go grabs it from github, but then decides to use gopkg.in

I would like to add that a few months ago, I didn't have this issue (and I tested just now using an earlier version):

These versions have no isssue when used together:
go: finding github.com/mattn/go-isatty v0.0.4
go: finding gopkg.in/mattn/go-isatty.v0 v0.0.4
go: finding gopkg.in/mattn/go-colorable.v0 v0.1.0
go: downloading github.com/mattn/go-isatty v0.0.4
go: downloading gopkg.in/mattn/go-isatty.v0 v0.0.4
go: downloading gopkg.in/mattn/go-colorable.v0 v0.1.0
go: extracting github.com/mattn/go-isatty v0.0.4
go: extracting gopkg.in/mattn/go-isatty.v0 v0.0.4
go: extracting gopkg.in/mattn/go-colorable.v0 v0.1.0

[azilber]

I just noticed that this was in fact referenced here: #35 (comment)

[sergeyklay]

@mattn

$ go get gopkg.in/mattn/go-colorable.v0
go: gopkg.in/mattn/go-colorable.v0@v0.1.2: parsing go.mod: missing module line
go: error loading module requirements

$ go get gopkg.in/mattn/go-colorable
go: finding gopkg.in latest
go get gopkg.in/mattn/go-colorable: malformed module path "gopkg.in/mattn/go-colorable": invalid version

$ env | grep -e "^GO"
GOBIN=/home/klay/go/bin
GOPROXY=https://goproxy.io
GO111MODULE=on
GOPATH=/home/klay/go

$ go version
go version go1.12.7 linux/amd64

[dolmen]

Here is a list of modules which incorrectly import this module via gopkg.in:
https://pkg.go.dev/gopkg.in/mattn/go-colorable.v0?tab=importedby

All of them are old forks of github.com/cheegaaa/pb.

The issue in pb has been fixed by cheggaaa/pb#146

[dolmen]

@mattn Nobody reported on this issue for 3 years. It can be closed.