How To Install Go and Set Up a Local Programming Environment on macOS

Introduction

Go is a programming language that was born out of frustration at Google. Developers continually had to pick a language that executed efficiently but took a long time to compile, or to pick a language that was easy to program but ran inefficiently in production. Go was designed to have all three available at the same time: fast compilation, ease of programming, and efficient execution in production.

While Go is a versatile programming language that can be used for many different programming projects, it’s particularly well suited for networking/distributed systems programs, and has earned a reputation as “the language of the cloud.” It focuses on helping the modern programmer do more with a strong set of tooling, removing debates over formatting by making the format part of the language specification, as well as making deployment easy by compiling to a single binary. Go is easy to learn, with a very small set of keywords, which makes it a great choice for beginners and experienced developers alike.

This tutorial will guide you through installing Go on your local macOS machine and setting up a programming workspace via the command line.

Prerequisites

You will need a macOS computer with administrative access that is connected to the internet.

Step 1 — Opening Terminal

We’ll be completing most of our installation and setup on the command line, which is a non-graphical way to interact with your computer. That is, instead of clicking on buttons, you’ll be typing in text and receiving feedback from your computer through text as well. The command line, also known as a shell, can help you modify and automate many of the tasks you do on a computer every day, and is an essential tool for software developers.

The macOS Terminal is an application you can use to access the command line interface. Like any other application, you can find it by going into Finder, navigating to the Applications folder, and then into the Utilities folder. From here, double-click the Terminal like any other application to open it up. Alternatively, you can use Spotlight by holding down the CMD and SPACE keys to find Terminal by typing it out in the box that appears.

macOS Terminal

There are many more Terminal commands to learn that can enable you to do more powerful things. The article “An Introduction to the Linux Terminal” can get you better oriented with the Linux Terminal, which is similar to the macOS Terminal.

Now that you have opened up Terminal, you can download and install Xcode, a package of developer tools that you will need in order to install Go.

Step 2 — Installing Xcode

Xcode is an integrated development environment (IDE) that is comprised of software development tools for macOS. You can check if Xcode is already installed by typing the following in the Terminal window:


  • xcode-select -p

The following output means that Xcode is installed:


Output
/Library/Developer/CommandLineTools

If you received an error, then in your web browser install Xcode from the App Store and accept the default options.

Once Xcode is installed, return to your Terminal window. Next, you’ll need to install Xcode’s separate Command Line Tools app, which you can do by typing:


  • xcode-select --install

At this point, Xcode and its Command Line Tools app are fully installed, and we are ready to install the package manager Homebrew.

Step 3 — Installing and Setting Up Homebrew

While the macOS Terminal has a lot of the functionality of Linux Terminals and other Unix systems, it does not ship with a package manager that accommodates best practices. A package manager is a collection of software tools that work to automate installation processes that include initial software installation, upgrading and configuring of software, and removing software as needed. They keep installations in a central location and can maintain all software packages on the system in formats that are commonly used. Homebrew provides macOS with a free and open source software package managing system that simplifies the installation of software on macOS.

To install Homebrew, type this into your Terminal window:


  • /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Homebrew is made with Ruby, so it will be modifying your computer’s Ruby path. The curl command pulls a script from the specified URL. This script will explain what it will do and then pauses the process to prompt you to confirm. This provides you with a lot of feedback on what the script is going to be doing to your system and gives you the opportunity to verify the process.

If you need to enter your password, note that your keystrokes will not display in the Terminal window but they will be recorded. Simply press the return key once you’ve entered your password. Otherwise press the letter y for “yes” whenever you are prompted to confirm the installation.

Let’s walk through the flags that are associated with the curl command:

  • The -f or --fail flag tells the Terminal window to give no HTML document output on server errors.
  • The -s or --silent flag mutes curl so that it does not show the progress meter, and combined with the -S or --show-error flag it will ensure that curl shows an error message if it fails.
  • The -L or --location flag will tell curl to redo the request to a new place if the server reports that the requested page has moved to a different location.

Once the installation process is complete, we’ll put the Homebrew directory at the top of the PATH environment variable. This will ensure that Homebrew installations will be called over the tools that macOS may select automatically that could run counter to the development environment we’re creating.

You should create or open the ~/.bash_profile file with the command-line text editor nano using the nano command:


  • nano ~/.bash_profile

Once the file opens up in the Terminal window, write the following:

export PATH=/usr/local/bin:$PATH

To save your changes, hold down the CTRL key and the letter o, and when prompted press the RETURN key. Now you can exit nano by holding the CTRL key and the letter x.

Activate these changes by executing the following in Terminal:


  • source ~/.bash_profile

Once you have done this, the changes you have made to the PATH environment variable will go into effect.

You can make sure that Homebrew was successfully installed by typing:


  • brew doctor

If no updates are required at this time, the Terminal output will read:


Output
Your system is ready to brew.

Otherwise, you may get a warning to run another command such as brew update to ensure that your installation of Homebrew is up to date.

Once Homebrew is ready, you can install Go.

Step 4 — Installing Go

You can use Homebrew to search for all available packages with the brew search command. For the purpose of this tutorial, you will search for Go-related packages or modules:


  • brew search golang

Note: This tutorial does not use brew search go as it returns too many results. Because go is such a small word and would match many packages, it has become common to use golang as the search term. This is common practice when searching the internet for Go-related articles as well. The term Golang was born from the domain for Go, which is golang.org.

The Terminal will output a list of what you can install:


Output
golang golang-migrate

Go will be among the items on the list. Go ahead and install it:


  • brew install golang

The Terminal window will give you feedback regarding the installation process of Go. It may take a few minutes before installation is complete.

To check the version of Go that you installed, type the following:


  • go version

This will output the specific version of Go that is currently installed, which will by default be the most up-to-date, stable version of Go that is available.

In the future, to update Go, you can run the following commands to first update Homebrew and then update Go. You don’t have to do this now, as you just installed the latest version:


  • brew update
  • brew upgrade golang

brew update will update the formulae for Homebrew itself, ensuring you have the latest information for packages you want to install. brew upgrade golang will update the golang package to the latest release of the package.

It is good practice to ensure that your version of Go is up-to-date.

With Go installed on your computer, you are now ready to create a workspace for your Go projects.

Step 5 — Creating Your Go Workspace

Now that you have Xcode, Homebrew, and Go installed, you can go on to create your programming workspace.

The Go workspace will contain two directories at its root:

  • src: The directory that contains Go source files. A source file is a file that you write using the Go programming language. Source files are used by the Go compiler to create an executable binary file.
  • bin: The directory that contains executables built and installed by the Go tools. Executables are binary files that run on your system and execute tasks. These are typically the programs compiled by your source code or another downloaded Go source code.

The src subdirectory may contain multiple version control repositories (such as Git, Mercurial, and Bazaar). You will see directories like github.com or golang.org when your program imports third party libraries. If you are using a code repository like github.com, you will also put your projects and source files under that directory. This allows for a canonical import of code in your project. Canonical imports are imports that reference a fully qualified package, such as github.com/digitalocean/godo.

Here is what a typical workspace may look like:

.
├── bin
│   ├── buffalo                                      # command executable
│   ├── dlv                                          # command executable
│   └── packr                                        # command executable
└── src
    └── github.com
        └── digitalocean
            └── godo
                ├── .git                            # Git reposistory metadata
                ├── account.go                      # package source
                ├── account_test.go                 # test source
                ├── ...
                ├── timestamp.go
                ├── timestamp_test.go
                └── util
                    ├── droplet.go
                    └── droplet_test.go

The default directory for the Go workspace as of 1.8 is your user’s home directory with a go subdirectory, or $HOME/go. If you are using a version of Go earlier than 1.8, it is considered best practice to still use the $HOME/go location for your workspace.

Issue the following command to create the directory structure for your Go workspace:


  • mkdir -p $HOME/go/{bin,src}

The -p option tells mkdir to create all parents in the directory, even if they don’t currently exist. Using {bin,src} creates a set of arguments to mkdir and tells it to create both the bin directory and the src directory.

This will ensure the following directory structure is now in place:

└── $HOME
    └── go
        ├── bin
        └── src

Prior to Go 1.8, it was required to set a local environment variable called $GOPATH. While it is no longer explicitly required to do so, it is still considered a good practice as many third party tools still depend on this variable being set.

You can set your $GOPATH by adding it to your ~/.bash_profile.

First, open ~/.bash_profile with nano or your preferred text editor:


  • nano ~/.bash_profile

Set your $GOPATH by adding the following to the file:

~/.bash_profile
export GOPATH=$HOME/go

When Go compiles and installs tools, it will put them in the $GOPATH/bin directory. For convenience, it’s common to add the workspace’s /bin subdirectory to your PATH in your ~/.bash_profile:

~/.bash_profile
export PATH=$PATH:$GOPATH/bin

You should now have the following entries in your ~/.bash_profile:

~/.bash_profile
export GOPATH=$HOME/go
export PATH=$PATH:$GOPATH/bin

This will now allow you to run any programs you compile or download via the Go tools anywhere on your system.

To update your shell, issue the following command to load the global variables you just created:


  • . ~/.bash_profile

You can verify your $PATH is updated by using the echo command and inspecting the output:


  • echo $PATH

You should see your $GOPATH/bin which will show up in your home directory. If you were logged in as sammy, you would see /Users/sammy/go/bin in the path.


Output
/Users/sammy/go/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

Now that you have the root of the workspace created and your $GOPATH environment variable set, you will create your future projects with the following directory structure. This example assumes you are using github.com as your repository:

$GOPATH/src/github.com/username/project

If you were working on the https://github.com/digitalocean/godo project, you would put it in the following directory:

$GOPATH/src/github.com/digitalocean/godo

Structuring your projects in this manner will make projects available with the go get tool. It will also help readability later.

You can verify this by using the go get command to fetch the godo library:


  • go get github.com/digitalocean/godo

We can see it successfully download the godo package by listing the directory:


  • ls -l $GOPATH/src/github.com/digitalocean/godo

You will receive output similar to this:


Output
-rw-r--r-- 1 sammy staff 2892 Apr 5 15:56 CHANGELOG.md -rw-r--r-- 1 sammy staff 1851 Apr 5 15:56 CONTRIBUTING.md . . . -rw-r--r-- 1 sammy staff 4893 Apr 5 15:56 vpcs.go -rw-r--r-- 1 sammy staff 4091 Apr 5 15:56 vpcs_test.go

In this step, you created a Go workspace and configured the necessary environment variables. In the next step you will test the workspace with some code.

Step 6 — Creating a Simple Program

Now that you have your Go workspace set up, it’s time to create a simple “Hello, World!” program. This will make sure that your workspace is working and gives you the opportunity to become more familiar with Go.

Because you are creating a single Go source file, and not an actual project, you don’t need to be in your workspace to do this.

From your home directory, open up a command-line text editor, such as nano, and create a new file:


  • nano hello.go

Once the text file opens up in Terminal, type out your program:

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

Exit nano by typing the control and x keys, and when prompted to save the file press y.

This code will use the fmt package and call the Println function with Hello, World! as the argument. This will cause the phrase Hello, World! to print out to the terminal when the program is run.

Once you exit out of nano and return to your shell, run the program:


  • go run hello.go

The hello.go program that you just created will cause Terminal to produce the following output:


Output
Hello, World!

In this step, you used a basic program to verify that your Go workspace is properly configured.

Conclusion

Congratulations! At this point you have a Go programming workspace set up on your local macOS machine and can begin a coding project!

Originally posted on DigitalOcean Community Tutorials
Author: DigitalOcean

Deja un comentario

Tu dirección de correo electrónico no será publicada. Los campos obligatorios están marcados con *