Thu Feb 5, 2015, 400 words, read in about 2 mins.
golang gopath linux shell bash

Usually I have only one GOPATH in my machine and thats most Gophers out there recommend. However, sometimes we just need to work on different projects with different versions of the same dependency, and it is out of question to update them. We just don’t want to break something that is working, or mess with it.

The quick solution is to point GOPATH to somewhere else, but everytime we have to swap the project we are working on, we need to change it again.

So I just came up with a simple solution that works on command line shell with Bash, and can be adapted to other shells. Since I am a vim user, this should work well. I do not recommend this method for Sublime Text users or just any other IDE that uses its own method for setting GOPATH. It will not work unless you load the Editor/IDE from the same command line shell and it do not have its own way to setup GOPATH.

The solution is simple. Just include the following snippet in your ~/.bashrc (or ~/.bash_profile) and reload your shell environment with source ~/.bashrc. This snippet will create a shell function that will override the builtin command cd with a customized one that scans the entered directory, and every other above, for a file named .gopath.

cd () {
    builtin cd "[email protected]"
    while [ "$cdir" != "/" ]; do
        if [ -e "$cdir/.gopath" ]; then
            export GOPATH=$cdir
        cdir=$(dirname "$cdir")

Now you just need to create a .gopath file in every directory you want as your GOPATH and every time you enter this directory, the redefined cd function will set the GOPATH of your current environment to this directory.

For example, let us create two directories, A and B, both with a subdirectory src to fully illustrate the solution.

$ go env GOPATH

$ mkdir -p ~/A/src && touch ~/A/.gopath
$ mkdir -p ~/B/src && touch ~/B/.gopath

$ cd ~/A/src
$ go env GOPATH

$ cd ~/B/src
$ go env GOPATH

Ok, but now I want my old GOPATH back again…

$ cd /home/user/Go
$ go env GOPATH

Oops… We just need to touch .gopath here!!

$ touch /home/user/Go/.gopath
$ cd .
$ go env GOPATH

That’s it! Simple GOPATH management without external dependencies (eg. direnv)!

is a programmer with more than 18 years of experience in different sub areas of the internet and software industry. He is a open-source contributor and author of a few projects at Github. You can also find him on Twitter, and LinkedIn.