cannot load github.com/ugorji/go/codec: ambiguous import: found github.com/ugorji/go/codec in multiple modules

[marcoippolito]

Ubuntu 18.04.01 Server Edition

marco@pc01:~/go$ go version
go version go1.12.5 linux/amd64


marco@pc01:~/go/pkg/mod/github.com$ ls -lah
total 36K
drwxrwxr-x 9 marco marco 4.0K Jun 10 15:31 .
drwxrwxr-x 8 marco marco 4.0K May 31 08:40 ..
drwxrwxr-x 5 marco marco 4.0K Jun 10 15:08 gin-contrib
drwxrwxr-x 4 marco marco 4.0K Jun 10 15:08 gin-gonic
drwxrwxr-x 4 marco marco 4.0K Jun 10 15:08 golang
drwxrwxr-x 8 marco marco 4.0K May 31 08:40 gonum
drwxrwxr-x 5 marco marco 4.0K May 31 08:40 hashicorp
drwxrwxr-x 4 marco marco 4.0K Jun 10 15:08 mattn
drwxrwxr-x 3 marco marco 4.0K May 31 08:40 pbnjay

When trying to execute the multiple-services example:

marco@pc01:~/go/marcoGolang/gin-examples/multiple-service$ go run main.go 
go: extracting github.com/ugorji/go v1.1.4
go: extracting github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2
build command-line-arguments: cannot load github.com/ugorji/go/codec: ambiguous import: 
found github.com/ugorji/go/codec in multiple modules:
github.com/ugorji/go v1.1.4 (/home/marco/go/pkg/mod/github.com/ugorji/[email protected]/codec)
github.com/ugorji/go/codec v0.0.0-20181209151446-772ced7fd4c2 (/home/marco/go/pkg
/mod/github.com/ugorji/go/[email protected])
marco@pc01:~/go/marcoGolang/gin-examples/multiple-service$ 

marco@pc01:~/go/pkg/mod/github.com$ ls -lah;
total 40K
drwxrwxr-x 10 marco marco 4.0K Jun 10 15:32 .
drwxrwxr-x  8 marco marco 4.0K May 31 08:40 ..
drwxrwxr-x  5 marco marco 4.0K Jun 10 15:08 gin-contrib
drwxrwxr-x  4 marco marco 4.0K Jun 10 15:08 gin-gonic
drwxrwxr-x  4 marco marco 4.0K Jun 10 15:08 golang
drwxrwxr-x  8 marco marco 4.0K May 31 08:40 gonum
drwxrwxr-x  5 marco marco 4.0K May 31 08:40 hashicorp
drwxrwxr-x  4 marco marco 4.0K Jun 10 15:08 mattn
drwxrwxr-x  3 marco marco 4.0K May 31 08:40 pbnjay
drwxrwxr-x  4 marco marco 4.0K Jun 10 15:32 ugorji

marco@pc01:~/go/pkg/mod/github.com/ugorji$ ls -lah
total 16K
drwxrwxr-x  4 marco marco 4.0K Jun 10 15:32 .
drwxrwxr-x 10 marco marco 4.0K Jun 10 15:32 ..
drwxrwxr-x  3 marco marco 4.0K Jun 10 15:32 go
dr-x------  3 marco marco 4.0K Jun 10 15:32 [email protected]

I realized that this happens for all examples.

How to solve the problem?

[thinkerou]

gin version?
please see gin-gonic/gin#1673 thanks!

[marcoippolito]

@thinkerou const Version = "v1.4.0-dev"

As suggested here: https://github.com/ugorji/go/commit/8fd0f8d918c8f0b52d0af210a812ba882cc31a1e
I tried also to add v1.1.2. But the problem persists.
Is there an official solution to the problem? As far as I understand from various discussions, as this one: https://github.com/ugorji/go/commit/8fd0f8d918c8f0b52d0af210a812ba882cc31a1e , there have been different attempts of solution, but none "the" solution. Am I right?

[thinkerou]

@marcoippolito please use v1.4.0

[marcoippolito]

@thinkerou After removing also from cache everything related to the previous installation of gin, I repeated the installation:

marco@pc01:~/go/src$ go get -u github.com/gin-gonic/gin
marco@pc01:~$ cat go/src/github.com/gin-gonic/gin/version.go 
// Copyright 2018 Gin Core Team.  All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.

package gin

// Version is the current gin framework's version.
const Version = "v1.4.0-dev"


marco@pc01:~/go/src/github.com$ go version
go version go1.12.5 linux/amd64

Ubuntu 18.04.01 

What am I doing wrong?
PS: even without the -u flag the version installed is v1.4.0-dev :

marco@pc01:~/go$ go get github.com/gin-gonic/gin

marco@pc01:~$ cat go/src/github.com/gin-gonic/gin/version.go 
// Copyright 2018 Gin Core Team.  All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package gin

// Version is the current gin framework's version.
const Version = "v1.4.0-dev"

[thinkerou]

use go mod, please see https://github.com/gin-gonic/examples/blob/master/go.mod#L8

[marcoippolito]

@thinkerou go.mod is already set as v.1.4.0 :

marco@pc01:~$ cat go/marcoGolang/gin-examples/go.mod
module github.com/gin-gonic/examples

go 1.12

require (
    github.com/dustin/go-broadcast v0.0.0-20171205050544-f664265f5a66
    github.com/gin-gonic/autotls v0.0.0-20190406003154-fb31fc47f521
    github.com/gin-gonic/gin v1.4.0
    github.com/golang/protobuf v1.3.1
    github.com/jessevdk/go-assets v0.0.0-20160921144138-4f4301a06e15
    github.com/manucorporat/stats v0.0.0-20180402194714-3ba42d56d227
    github.com/newrelic/go-agent v2.7.0+incompatible
    github.com/stretchr/testify v1.3.0
    github.com/thinkerou/favicon v0.1.0
    github.com/ugorji/go/codec v0.0.0-20190204201341-e444a5086c43
    golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c
    golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4
    gopkg.in/go-playground/validator.v8 v8.18.2
)

A) Which other go.mod needs to be changed?

Still do not understand why, following these instructions : https://github.com/gin-gonic/gin#installation ,

B) when installing through:

 go get -u github.com/gin-gonic/gin

v1.4.0-dev is installed. Can you please clarify me also this point?

[thinkerou]

@marcoippolito please learn go mod usage.
If you use gin v1.4.0 release version, github.com/ugorji/go/codec v0.0.0-20190204201341-e444a5086c43 should not exist.

[marcoippolito]

I discovered that the problem disappears when I download the single example files, one by one, instead of downloading or go-getting the entire examples directory

[mfaerevaag]

This seemed to fix it for me: gin-gonic/gin#1673 (comment)

[appleboy]

Please clone the latest version and try the following steps:

gin version: v1.5
go version: 1.13

# in examples folder
$ go mod download
$ go run multiple-service/main.go

or switch to multiple-service folder

$ go mod init example
$ go mod tidy
$ go run main.go