Using Go 1.25 Toolset

Red Hat Developer Tools 1

Installing and using Go 1.25 Toolset

Red Hat Customer Content Services

Abstract

Go Toolset is a Red Hat offering for developers on the Red Hat Enterprise Linux (RHEL) operating system. Use this guide for an overview of Go Toolset, to learn how to invoke and use different versions of Go tools, and to find resources with more in-depth information.

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Chapter 1. Go Toolset

Go Toolset is a Red Hat offering for developers on Red Hat Enterprise Linux (RHEL). It provides the Go programming language tools and libraries. Note that Go is alternatively known as golang.

Go Toolset is available as a module for RHEL 8 and as packages for RHEL 9 and 10.

1.1. Go Toolset components

The following components are available as a part of Go Toolset:

NameVersionDescription

golang

1.25

A Go compiler.

delve

1.25

A Go debugger.

1.2. Go Toolset compatibility

Go Toolset is available for Red Hat Enterprise Linux on AMD and Intel 64-bit (x86_64), 64-bit ARM (aarch64), IBM Power Systems, Little Endian (ppc64le), and 64-bit IBM Z (s390x) architectures.

1.3. Installing Go Toolset

Install Go Toolset and all dependent packages on Red Hat Enterprise Linux by enabling the go-toolset module on RHEL 8 or installing the go-toolset package on RHEL 9 and 10.

Prerequisites

  • All available Red Hat Enterprise Linux updates are installed.

Procedure

  • Install Go Toolset:

    • On RHEL 8, enter: 

      # yum module install go-toolset

    • On RHEL 9 and 10, enter: 

      # dnf install go-toolset

1.4. Installing Go documentation

You can install documentation for the Go programming language on your local system.

Procedure

  • Install the golang-docs package:

    • On RHEL 8, enter: 

      # yum install golang-docs

    • On RHEL 9 and 10, enter: 

      # dnf install golang-docs

Verification

  • Open /usr/lib/golang/doc/go_spec.html in a browser that is installed on the same host.

1.5. Additional resources

Chapter 2. The Go compiler

The Go compiler in Go Toolset builds Go source code into executables and libraries.

2.1. Prerequisites

2.2. Setting up a Go workspace

Modern Go projects are built using modules. You can start with a single module and then optionally group multiple modules into a workspace to work on them simultaneously.

Procedure

  1. Create a root directory for your projects, for example: 

    $ mkdir ~/go-projects/

  2. Change into the project directory: 

    $ cd ~/go-projects/

  3. Initialize a module:

    1. Create a directory for your module: 

      $ mkdir <module_name>

    2. Change into the module’s directory: 

      $ cd <module_name>

    3. Initialize the module: 

      $ go mod init <module_name>

      This command creates a single-module project.

    If you want to create multiple modules, repeat this step for every module.

  4. If you want to work on multiple modules at the same time, create a multi-module workspace:

    1. Change into the project directory: 

      $ cd ~/go-projects/

    2. Initialize a workspace to include multiple modules: 

      $ go work init <module_name_1> <module_name_n> ...

Additional resources

2.3. Compiling a Go program

You can compile your Go program by using the Go compiler. The Go compiler creates an executable binary file as a result of compiling.

Prerequisites

Procedure

  • Compile the Go sources in the current directory: 

    $ go build .

2.4. Running a Go program

The Go compiler creates an executable binary file as a result of compiling. Complete the following steps to run your program.

Procedure

  • Use one of the following options to run your Go program:

    • To run an compiled program, enter: 

      $ ./<file_name>

      Replace <file_name> with the name of your executable file.

    • To compile the sources in the current directory and run the program in a single step, enter: 

      $ go run .

2.5. Installing compiled Go projects

You can download and install third-party Go projects from online resources to use their executable files and libraries in further Go projects. After installation, the executable files and libraries of the project are copied according to the directories in the Go workspace. Its dependencies are installed as well.

Prerequisites

Procedure

  • Install a Go project: 

    $ go install <go_project>

2.6. Downloading and installing Go projects

You can download and install third-party Go projects from online resources to use their executable files and libraries in further Go projects. After installation, the executable files and libraries of the project are copied according to the directories in the Go workspace. Its dependencies are installed as well.

Prerequisites

Procedure

  1. To download and install a Go project, enter: 

    $ go install <third_party_go_project>

  2. Optional: For information on possible values of third-party projects, enter: 

    $ go help importpath

2.7. Additional resources

Chapter 3. The gofmt formatting tool

Instead of a style guide, the Go programming language uses the gofmt code formatting tool. gofmt automatically formats your code according to the Go layout rules.

3.1. Prerequisites

3.2. Formatting code

You can use the gofmt formatting tool to format code in a given path. When the path leads to a single file, the changes apply only to the file. When the path leads to a directory, all .go files in the directory are processed.

Procedure

  • To format your code in a given path, enter: 

    $ gofmt -w <code_path>

    Replace <code_path> with the path to the code you want to format.

    Note

    To print the formatted code to standard output instead of writing it to the original file, omit the -w option.

3.3. Previewing changes to code

You can use the gofmt formatting tool to preview changes done by formatting code in a given path. The output in unified diff format is printed to standard output.

Procedure

  • Show differences in your code in a given path: 

    $ gofmt -d <code_path>

    Replace <code_path> with the path to the code you want to compare.

3.4. Simplifying code

You can use the gofmt formatting tool to simplify your code.

Procedure

  1. To simplify code in a given path, enter: 

    $ gofmt -s -w <code_path>

    Replace <code_path> with the path to the code you want to simplify.

  2. To apply the changes, enter: 

    $ gofmt -w <code_path>

    Replace <code_path> with the path to the code you want to format.

3.5. Refactoring code

You can use the gofmt formatting tool to refactor your code by applying arbitrary substitutions.

Procedure

  1. To refactor your code in a given path, enter: 

    $ gofmt -r -w <rewrite_rule> <code_path>

    Replace <code_path> with the path to the code you want to refactor and <rewrite_rule> with the rule you want it to be rewritten by.

  2. To apply the changes, enter: 

    # gofmt -w <code_path>

    Replace <code_path> with the path to the code you want to format.

3.6. Additional resources

Chapter 4. The Go race detector

Go Toolset includes the Go race detector, which is a tool of the Go standard library for finding race conditions.

Note that the Go race detector can significantly increase processor and memory use at runtime.

4.1. Prerequisites

4.2. Using the Go race detector

Use the Go race detector to check your code for race conditions.

Procedure

  • Use the race detector: 

    # go build -race -o <output_file> <go_main_package>

    Replace <output_file> with the name of your executable file and <go_main_package> with the name of the package you want to test.

4.3. Additional resources

Chapter 5. Container images with Go Toolset

You can build your own Go Toolset containers from either Red Hat Enterprise Linux container images or Red Hat Universal Base Images (UBI).

5.1. Red Hat Enterprise Linux Go Toolset container images contents

The Red Hat Enterprise Linux Go Toolset container images include the Go component (version 1.25) in the go-toolset-1.25 package.

ComponentVersionPackage

Go

1.25

go-toolset-1.25

5.2. Pulling the RHEL-based Go Toolset container image

Pull the container image from the Red Hat registry before running your container and performing actions.

Procedure

  • Pull the required image:

    • For an image based on RHEL 8, enter: 

      # podman pull registry.redhat.io/rhel8/go-toolset

    • For an image based on RHEL 9, enter: 

      # podman pull registry.redhat.io/rhel9/go-toolset

    • For an image based on RHEL 10, enter: 

      # podman pull registry.redhat.io/rhel10/go-toolset

5.3. Pulling the UBI-based Go Toolset container image

Pull the container image from the Red Hat registry before running your container and performing actions.

Procedure

  • Pull the required image:

    • For an image based on RHEL 8, enter: 

      # podman pull registry.access.redhat.com/ubi8/go-toolset

    • For an image based on RHEL 9, enter: 

      # podman pull registry.access.redhat.com/ubi9/go-toolset

    • For an image based on RHEL 10, enter: 

      # podman pull registry.access.redhat.com/ubi10/go-toolset

5.4. Creating a custom UBI-based container with Go Toolset

Go Toolset packages are part of the Red Hat Universal Base Images repositories, which means you can install Go Toolset as an addition to the base UBI container image. To keep the container image size small, install only individual packages instead of the entire Go Toolset.

Alternatively, you can install the UBI Go Toolset container image to access Go Toolset. For further information, see Pulling the UBI-based Go Toolset container image.

Prerequisites

Procedure

  • To create a container image containing Go Toolset, add the following to your container file:

    • For an image based on RHEL 8, enter: 

      FROM registry.access.redhat.com/ubi8/ubi:latest

RUN yum module install -y go-toolset

    • For an image based on RHEL 9, enter: 

      FROM registry.access.redhat.com/ubi9/ubi:latest

RUN yum install -y go-toolset

    • For an image based on RHEL 10, enter: 

      FROM registry.access.redhat.com/ubi10/ubi:latest

RUN yum install -y go-toolset

5.5. Additional resources

Chapter 6. Changes in Go Toolset 1.25

Go Toolset has been updated to version 1.25.0.

  • Language:

    • There are no user-visible changes to the language in Go 1.25.

  • Runtime and Performance:

    • The runtime now automatically sets GOMAXPROCS based on the CPU quota available to the container on Linux.
    • A new experimental garbage collector ("Green Tea") is available, optimized for improving tail latency in certain workloads.

  • Tools:

    • The compiler and linker now default to generating DWARF 5 debug information.
    • The go build -asan command now detects memory leaks at program exit by default.
    • The go doc command supports a new -http flag to start a local documentation server.
    • The go version command supports a -json flag to print build information in JSON format.

  • Standard Library:

    • A new experimental encoding/json/v2 package is available, offering performance improvements and new features.

For more information, see the Content from tip.golang.org is not included.upstream release notes.

Go Toolset is a rolling Application Stream, and Red Hat supports only the latest version. For more information, see the Red Hat Enterprise Linux Application Streams Life Cycle document.

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