Where does go look for packages?

Where does go look for packages?

Go first searches for package directory inside GOROOT/src directory and if it doesn’t find the package, then it looks for GOPATH/src . Since, fmt package is part of Go’s standard library which is located in GOROOT/src , it is imported from there.

How do I import a go package?

All packages live inside $GOPATH/src. So, you can import any package from there by typing the package’s directory path except $GOPATH/src. For example, if a package is under: $GOPATH/src/apackage. You can import it like this: import “apackage” .

What is Gopath and Goroot?

GOROOT is a variable that defines where your Go SDK is located. GOPATH is a variable that defines the root of your workspace. By default, the workspace directory is a directory that is named go within your user home directory (~/go for Linux and MacOS, %USERPROFILE%/go for Windows).

What does Goroot point to?

GOROOT is for compiler and tools that come from go installation and is used to find the standard libraries. It should always be set to the installation directory. It is possible to install the Go tools to a different location.

Is Gopath still needed?

Technically speaking, GOPATH is still supported, and Go 1.13 Release Notes uses term “GOPATH mode” (as being opposite to the “modules mode”), but still, to me this is a tectonic shift in the Go development ecosystem evolution.

Is Goroot still used?

They are now only used when cross compiling. Go 1.0 also introduced $GOPATH based workspaces. If you’ve read this far, you probably know what a $GOPATH workspace is. But in case you don’t, this is documented on the golang.org website, and in this screencast.

How do I upgrade Go dependencies?

You can update dependency using 2 ways.

1. update the version on go.mod file manually.
2. using go get -u to update all your dependency or go get -u github.com/ClavinJune/[email protected] for specific dependency version.

Can you get go run from go build?

Even though I have GOPATH properly set, I still can’t get “go build” or “go run” to find my own packages. What am I doing wrong?

Why do I get error ” cannot find package ” in go build?

If you have a valid $GOROOT and $GOPATH but are developing outside of them, you might get this error if the package (yours or someone else’s) hasn’t been downloaded. If that’s the case, try go get -d (-d flag prevents installation) to ensure the package is downloaded before you run, build or install.

How to find the source of a package in go?

An implementation may require that all source files for a package inhabit the same directory. When building a program that imports the package ” widget ” the go command looks for src/pkg/widget inside the Go root, and then—if the package source isn’t found there—it searches for src/widget inside each workspace in order.

What does import path mean in go build?

An import path is a string used to import a package. A package’s import path is its module path joined with its subdirectory within the module. For example, the module github.com/google/go-cmp contains a package in the directory cmp/. That package’s import path is github.com/google/go-cmp/cmp.