install_go.sh

#!/bin/bash
set -e

VERSION="1.9.3"

if [ -n "`$SHELL -c 'echo $ZSH_VERSION'`" ]; then
    # assume Zsh
    shell_profile="zshrc"
elif [ -n "`$SHELL -c 'echo $BASH_VERSION'`" ]; then
    # assume Bash
    shell_profile="bashrc"
fi

DFILE="go$VERSION.linux-386.tar.gz"

if [ "$1" == "--32" ]; then
    DFILE="go$VERSION.linux-386.tar.gz"
elif [ "$1" == "--64" ]; then
    DFILE="go$VERSION.linux-amd64.tar.gz"
elif [ "$1" == "--arm" ]; then
    DFILE="go$VERSION.linux-armv6l.tar.gz"
elif [ "$1" == "--darwin" ]; then
    DFILE="go$VERSION.darwin-amd64.tar.gz"
elif [ "$1" == "--remove" ]; then
    rm -rf "$HOME/.go/"
    sed -i '/# GoLang/d' "$HOME/.${shell_profile}"
    sed -i '/export GOROOT/d' "$HOME/.${shell_profile}"
    sed -i '/:$GOROOT/d' "$HOME/.${shell_profile}"
    sed -i '/export GOPATH/d' "$HOME/.${shell_profile}"
    sed -i '/:$GOPATH/d' "$HOME/.${shell_profile}"
    echo "Go removed."
    exit 0

if [ -d "$HOME/.go" ] || [ -d "$HOME/go" ]; then
    echo "The 'go' or '.go' directories already exist. Exiting."
    exit 1
fi

echo "Downloading $DFILE ..."
wget https://storage.googleapis.com/golang/$DFILE -O /tmp/go.tar.gz

if [ $? -ne 0 ]; then
    echo "Download failed! Exiting."
    exit 1
fi

echo "Extracting File..."
tar -C "$HOME" -xzf /tmp/go.tar.gz
mv "$HOME/go" "$HOME/.go"
touch "$HOME/.${shell_profile}"
{
    echo '# GoLang'
    echo 'export GOROOT=$HOME/.go'
    echo 'export PATH=$PATH:$GOROOT/bin'
    echo 'export GOPATH=$HOME/go'
    echo 'export PATH=$PATH:$GOPATH/bin'
} >> "$HOME/.${shell_profile}"

mkdir -p $HOME/go/{src,pkg,bin}
echo -e "\nGo $VERSION was installed.\nMake sure to relogin into your shell or run:"
echo -e "\n\tsource $HOME/.${shell_profile}\n\nto update your environment variables."
echo "Tip: Opening a new terminal window usually just works. :)"
rm -f /tmp/go.tar.gz