source ~/go/setup x.y.z

setup

#!/bin/bash

go_version=$1
go_arch=linux-amd64

export GOPATH="$HOME/go"

if [ ! -e $GOPATH ]
then
    mkdir $GOPATH
fi

if [ -e $GOPATH/current ]
then
    cur_version=`cat $GOPATH/current`
    if [[ "x" == "x$go_version" ]]
    then
        go_version=$cur_version
    fi
    export PATH=${PATH//:$GOPATH\/$cur_version\/bin:$GOPATH\/bin/}
fi

if [[ "x" == "x$go_version" ]]
then
    echo 'Please specify the go version you want'
    return
fi

if [ ! -e $GOPATH/$go_version.tar.gz ]
then
    wget https://storage.googleapis.com/golang/go$go_version.$go_arch.tar.gz -O $GOPATH/$go_version.tar.gz
    if [ ! $? ]
    then
        rm $GOPATH/$go_version.tar.gz
        return
    fi
    tar -C $GOPATH -xzf $GOPATH/$go_version.tar.gz
    if [ ! -e $GOPATH/$go_version ]
    then
        rm -Rf $GOPATH/$go_version
    fi
    mv $GOPATH/go $GOPATH/$go_version
fi

export GOROOT="$GOPATH/$go_version"
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin

if [[ "$go_version" != "$cur_version" ]]
then
    rm -Rf $GOPATH/pkg
    echo $go_version > $GOPATH/current
fi

go version