Goland gopath mod#
Goland gopath download#

Goland gopath mod#

anywhere/outside/gopath/testproject $ go mod init /testproject Instead of moving the directory into $GOPATH, we now use Go module. Let’s go back to the problematic scenario. Go module alleviates this constraints, enabling Go projects be outside $GOPATH. The example illustrated above shows how Go restricts the structure and location of Go projects. With Go modules, Go projects are no longer confined to $GOPATH Which makes our project be able to run: $GOPATH/src//testproject $ GO111MODULE=off go run. So main.go can be modified to: package main Now we can specify the path of test package: /testproject/test based on $GOPATH/src. The only way to make it work without Go module was to move the project into $GOPATH, like: $ tree $GOPATH/src/ Without Go module enabled, We cannot specify our test package in main package, so we cannot find out which should be in 'XXX' location and cannot build this project. Let’s modify it to have one subpackage test: $ tree /anywhere/outside/gopath/testproject Problematic Scenario: Go project with more than one packages, outside $GOPATH

One main package is not the case, so that it is not confined by this limitation. Actually, the reason all projects must be in $GOPATH is due to subpackages. Surprisingly, it runs, even the project is outside $GOPATH. anywhere/outside/gopath/testproject $ GO111MODULE=off go run. anywhere/outside/gopath/testproject $ GO111MODULE=off go get k8s.io/klog Working Scenario: Go project with one package, outside $GOPATHįor example, I am implementing a project named testproject, with one package main with two files main.go and test_func.go as follows: Here I try to implement a Go project outside $GOPATH. Prior to Go 1.11, All projects, not just dependent packages, must be in $GOPATH directory. Go projects were required to be in $GOPATH without Go module Regarding version control, please refer to 2.įor package distribution, what Go module contributed is that Go projects are no longer confined to GOPATH, if it is a Go module. To make the Google’s saying correct, Go module does not entirely replace GOPATH, but replaces GOPATH for version control and package distribution.

Goland gopath download#

What Changed Exactly for Package ManagementĪs mentioned above, Go runtime still does use $GOPATH as a download directory of Go packages. The structure is different from that without Go module enabled, but Go runtime still downloads files in $GOPATH. This release adds preliminary support for a new concept called “modules,” an alternative to GOPATH with integrated support for versioning and package distribution.īut you can find out that you are still using GOPATH even with Go module enabled: $ GO111MODULE=on go get /google/go-cmp/cmp What Google said when they released Go 1.11 is: This is because you are still using GOPATH, and should know differences how we use GOPATH now and how we used GOPATH for packages in the past. Why we have to know this? It is obsolete. In the future, Go may no longer support GO111MODULE for compatibility in the future. Note: legacy versions of golang Dockerfile are being deleted from Docker hub. Hence, go get will download /google/go-cmp/cmp package following the legacy GOPATH mode. GO111MODULE=off indicates Go runtime to use legacy GOPATH mode, not Go module. $ tree -d -L 5 $GOPATH # assume tree is installed $ GO111MODULE=off go get /google/go-cmp/cmp Here is an example of GOPATH structure: $ docker run -it golang:1.13 /bin/bash Pkg/ # Directory where compiled Go object files are stored Src/ # Directory where Go source files of the dependent packages are stored $GOPATHīin/ # Directory where executable binaries are stored GOPATH has a hierarchical directory structure. Without Go module enabled, the module go-cmp should be in GOPATH, so that Go build system knows where the imported packages are 1. For example, you can use Google’s comparison package /google/go-cmp/cmp as: package mainįmt.Println(cmp.Diff('Hello World', 'Hello Go')) Go programmers can import third-party packages (i.e. At first I did not understand what it means specifically. Google introduced Go module as an alternative to GOPATH for versioning and package distribution. Go 1.11 introduces a new dependency mangement system, Go modules (That’s why Go uses the environment variable name GO111MODULE: indicating to use Go 1.11 module). This post introduces Go modules, introduced in Go version 1.11.