Can't get Golang to work in Ubuntu

Question

Ok, So I\'ve downloaded Go 1.1 and put it into $HOME/Documents/go.

Then, I\'ve modified my .bashrc to be:

export GOPATH=$HOME/Documents/go           


        

Answer 1

To install go it is CRITICAL to first remove prior install (or you will get errors go build fails : runtime/mstkbar.go:151:10: debug.gcstackbarrieroff undefined)

dpkg -l|grep golang  #  if you see any, run following cmd to remove
sudo apt-get purge golang-*

Verify whether go is still installed

type go    # see if go is installed

typical output if go is installed

go is hashed (/usr/local/go/bin/go)

if go is installed remove it

sudo rm -rf /usr/local/go     #  not just /usr/local/go/bin/go

download the latest tarball https://golang.org/dl/ expand and install

new_golang_ver=$(curl https://golang.org/VERSION?m=text 2> /dev/null)
cd /tmp
wget https://dl.google.com/go/${new_golang_ver}.linux-amd64.tar.gz
sudo tar -C /usr/local -xzf  ${new_golang_ver}.linux-amd64.tar.gz

define these environment variables in your ~/.bashrc

export PATH=/usr/local/go/bin:${PATH}
export GOPATH=${HOME}/gopath  # typical value change at will
export PATH=${GOPATH}/bin:${PATH}

source your above new env var definitions

source ~/.bashrc  

verify install

go version

if installed correctly typical output

go version go1.12.1 linux/amd64

--- install is complete so lets compile a hello world ---

[[ ! -d $GOPATH ]] && mkdir -p ${GOPATH}/{bin,pkg,src} # if no dir then create
mkdir -p ${GOPATH}/src/github.com/mygithubname/play
cd ${GOPATH}/src/github.com/mygithubname/play

now paste following to create the go source file hello_world.go

tee hello_world.go  << WOW

package main

import "fmt"

func main() {
    fmt.Printf("hello, world\n")
}

WOW

compile your source code

go build hello_world.go 

./hello_world     #  run your executable 

hello, world

---

to understand how to structure your go source code see https://golang.org/doc/code.html

Fix the missing package error

You also asked how to fix the missing dependency errors ... for example

scott@rapacious ~/other_src/gopath/src/github.com/bigeagle/gohop $ go build
hop/cipher.go:27:2: cannot find package "github.com/golang/snappy" in any of:
    /usr/local/go/src/github.com/golang/snappy (from $GOROOT)
    /home/scott/other_src/gopath/src/github.com/golang/snappy (from $GOPATH)
internal/logging.go:6:2: cannot find package "github.com/op/go-logging" in any of:
    /usr/local/go/src/github.com/op/go-logging (from $GOROOT)
    /home/scott/other_src/gopath/src/github.com/op/go-logging (from $GOPATH)

above error will happen even after your go install is setup OK ... just issue this to download and install the missing upstream dependency go packages (and the ones they might also reference recursively)

cd ~/Documents/go/src/github.com/jan/scrypt/ # cd into the source dir
go get -v -t ./...   #  -v  verbose
                     #  -t  also download any test only packages
go build