CODEWITHSUNDEEP
gogo-modules
Marvin Caspar
Marvin Caspar

Reputation: 1409

go mod: cannot find module providing package

I am creating a go project with version 1.12.1. If I run GOPATH="$(pwd)/vendor:$(pwd)" GOBIN="$(pwd)/bin" go clean I get the following error:

can't load package: package github.com/marvincaspar/go-example: unknown import path "github.com/marvincaspar/go-example": cannot find module providing package github.com/marvincaspar/go-example

This is only for go clean, go run or go build works fine.

Here is the folder structure of main code:

.
├── Makefile
├── cmd
│   └── server
│       └── main.go
├── go.mod
├── go.sum
└── pkg
    └── storage
        └── mysql
            └── storage.go

Here is how the go.mod file looks like:

module github.com/marvincaspar/go-example
go 1.12

require (
    github.com/go-sql-driver/mysql v1.4.1
)

And finally the main.go file:

package main

import (
    "fmt"
    "os"

    "github.com/marvincaspar/go-example/pkg/storage/mysql"
)

func main() {
    if err := run(); err != nil {
        fmt.Fprintf(os.Stderr, "%v", err)
        os.Exit(1)
    }
}

func run() error {
    // init storage
    s := mysql.NewStorage()
    // do some other stuff...
}

Any ideas what I am doing wrong?

Upvotes: 67

Views: 264043

Answers (7)

SJ_Bose
SJ_Bose

Reputation: 41

Also check if there are non *.go files in the current dir. This probelm occurred to me when I tried to run the command while not properly organising the files, as a result in the current dir there is a folder containing .tmpl files.

Upvotes: 0

Taku
Taku

Reputation: 5927

In my case, this was failing in CircleCI and I could not produce locally. Here was my scenario.

App A depends on Module B
Module B depends on Module C
App A directly depends on Module C

However, the module C's version was different in App A than in Module B. This was the reason for this error and by fixing this in Module B by running go get -u, publishing a new version, and pulling it down in App A fixed it for me.

Upvotes: 0

JohnAllen
JohnAllen

Reputation: 7531

This can also happen if you are using workspaces. It seems like you can't use one package without workspaces if you are using others with workspaces.

So try going into your top level workspace and do

go work use ./problemPackage.

At least this worked for me.

Upvotes: 7

Tahmid Bin Rashid
Tahmid Bin Rashid

Reputation: 754

To solve this problem you have to do few things, First, go to the project directory via the Terminal then run the following command ( If you are using git clone then go to the clone directory folder via Terminal and run the following command):

Step 1: sudo go mod init your-program.go

Step 2: sudo go mod tidy

Step 3: sudo go build your-program.go

Upvotes: -5

BITSSANDESH
BITSSANDESH

Reputation: 1135

I generally use go get and go mod tidy for same. It works all the time.

go mod tidy

Upvotes: 68

Nicholas Fernandes Paolillo
Nicholas Fernandes Paolillo

Reputation: 989

Normally this new project approach works for me:

go mod init <project_name>
go test

I have found that developing projects outside of GOROOT and GOPATH are much easier

Upvotes: 40

ShailyAggarwal
ShailyAggarwal

Reputation: 863

Go build/install is trying to find main package in your root directory, it is not checking sub-directories (cmd/server) in your case. Hence you are getting package not found error.

To properly build your code, you can run:

go build github.com/marvincaspar/go-example/cmd/server

Similarly, to run your project, you will have to provide module-name/main-package-path: 

go run github.com/marvincaspar/go-example/cmd/server

Go clean can be executed in same way, by providing module-name/path-with-main-package

go clean github.com/marvincaspar/go-example/cmd/server

or

GOPATH="$(pwd)/vendor:$(pwd)" GOBIN="$(pwd)/bin" go clean github.com/marvincaspar/go-example/cmd/server

However, as per https://blog.learngoprogramming.com/code-organization-tips-with-packages-d30de0d11f46, just put your source files into your project’s root. It’s better that way.

Upvotes: 25

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