golang modify gopath

Golang is a rapidly developing programming language that is widely used in cloud computing, network programming, containerization and other fields. When using Golang to develop projects, you may encounter situations where you need to modify GOPATH. This article will introduce how Golang modifies GOPATH, as well as common GOPATH configuration methods.

1. What is GOPATH

GOPATH is an important variable in the Golang development environment, which defines the local code storage path. When Golang compiles source code, it will look for dependent packages and source code in this path. Therefore, in order to compile and run Golang code normally, it is very important to configure the correct GOPATH.

2. View the current GOPATH

Enter the following command on the command line to view the current GOPATH configuration:

echo $GOPATH

If the output is empty, it means that it is not currently configured. GOPATH. If the content is output, it means that the GOPATH configuration has been completed and its path is displayed.

3. Modify GOPATH

The following is how to modify GOPATH:

1. Modify the environment variable directly

Enter in the command line The following command can directly modify the GOPATH environment variable:

export GOPATH=/path/to/gopath

Among them, /path/to/gopath is the new GOPATH path. The GOPATH modified by this method is only valid in the current terminal window.

2. Modify in the .bashrc file

.bashrc file is a file used to customize the bash terminal. You can write the GOPATH configuration into this file to make it Valid for every terminal window.

Enter the following command on the command line to open the .bashrc file:

vi ~/.bashrc

Add the following content to the file:

export GOPATH=/path/to/gopath

Among them, /path/to/ gopath is the new GOPATH path. Save and exit the file, then enter the following command in the terminal to make the changes take effect:

source ~/.bashrc

3. Modify in the IDE

For those who use Goland or other IDEs to develop Golang projects Users can also modify GOPATH in the IDE. Taking Goland as an example, just configure it in File->Settings->Go->GOPATH.

4. Implementation of multiple GOPATHs

In some cases, multiple GOPATHs need to be used. For example, a project depends on different versions of a package, and these versions are in different directories. To solve this problem, a GOPATH list can be used. The following is the implementation method:

1. Add multiple directory paths directly to the GOPATH variable

Enter the following command on the command line to add multiple directory paths to the GOPATH :

export GOPATH="/path/to/first/gopath:/path/to/second/gopath"

In the above command, /path/to/first/gopath and /path/to/second/gopath are two GOPATH paths. This configuration method requires manually specifying the paths to different GOPATHs.

2. Using GO MOD

After Golang version 1.11, GO MOD becomes Golang’s official dependency management tool. Use GO MOD to conveniently use multiple GOPATHs without manually specifying paths.

The steps to use GO MOD are as follows:

• Create a new project directory under your GOPATH and initialize it with GO MOD in that directory.

cd /path/to/project/dir
go mod init project_name

After initialization, a go.mod file will be generated, which records the dependencies and version information of the project.

• Add the required packages to the corresponding go.mod file.

go get github.com/gorilla/mux

When using go get to install the package, it will be automatically added to the go.mod file. At this time, $GOPATH/pkg/mod/github.com/ The downloaded source code is available in the gorilla/mux@v1.8.0 directory.

• Build the project

go build

GO MOD will independently search for dependencies and generate the corresponding go.sum file to record version information, etc.

The above are two methods of using multiple GOPATHs. You can choose a suitable method based on your project needs.

5. Conclusion

This article introduces how Golang modifies GOPATH and provides common GOPATH configuration methods. In addition, multiple GOPATHs can be easily used through GO MOD to manage different versions of dependent packages. When you encounter a situation where you need to modify GOPATH, you can follow the method in this article.

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