Installs the current release of Go

InstallGo

#!/bin/bash
#
# For more info see https://golang.org/doc/install.html, the instructions there are all
# that is needed to install Go.
#
# DO NOT RUN with sudo; Go should be installed under the user not root.  Using sudo will
# cause problems.

set -euo pipefail

if [ -z "$GOPATH" ]; then
	echo '$GOPATH must be set!'
	exit 1
fi

if [ -z "$GOROOT_BOOTSTRAP" ]; then
	echo '$GOROOT_BOOTSTRAP must be set'
	echo "If installing Go < 1.5 (in which case bootstrapping is not"
	echo 'needed, just set $GOROOT_BOOTSTRAP to an arbitrary value'
	exit 1
fi

readonly possible="
GOOS:GOARCH
----:------
:
darwin:386
darwin:amd64
darwin:arm
darwin:arm64
dragonfly:amd64
freebsd:386
freebsd:amd64
freebsd:arm
linux:386
linux:amd64
linux:arm
linux:arm64
linux:ppc64
linux:ppc64le
linux:mips64
linux:mips64le
netbsd:386
netbsd:amd64
netbsd:arm
openbsd:386
openbsd:amd64
openbsd:arm
plan9:386
plan9:amd64
solaris:amd64
windows:386
windows:amd64"

# Gather GOOS, GOARCH, etc.
eval $(go env)

goos="$GOOS"
goarch="$GOARCH"
vers=()

while [[ $# > 0 ]]
do
	case "$1" in
		-o|--goos)
			goos="$2"
			shift
			;;

		-a|--goarch)
			goarch="$2"
			shift
			;;

		-h|--help)
			echo "Usage: $0 [OPTIONS] versions..."
			echo ""
			echo "  Versions must be valid Go version numbers. "
			echo "  (E.g., 1.5.3, 1.6, 1.4.2, etc.)"
			echo '  --goos and --goarch default to $GOOS and $GOARCH'
			echo ""
			echo "  -o, --goos        specify the operating system to download"
			echo "  -a, --goarch      specify the architecture to download"
			echo "  -p, --possible    print possible GOOS/GOARCH combinations"
			echo "  -v, --version     print version"
			echo "  -h, --help        print help message"
			echo ""

			exit 0
			;;
		-v|--version)
			echo "$0 version 0.1"
			echo "By eric@ericlagergren.com"
			echo ""
			echo "This software is Public Domain."
			echo "The person who associated a work with this deed has dedicated"
			echo "the work to the public domain by waiving all of his or her"
			echo "rights to the work worldwide under copyright law, including"
			echo "all related and neighboring rights, to the extent allowed by law."
			echo ""
			echo "You can copy, modify, distribute and perform the work, even for"
			echo "commercial purposes, all without asking permission."
			echo ""
			echo "For more information: https://creativecommons.org/publicdomain/zero/1.0/"

			exit 0
			;;

		-p|--possible)
			echo "$possible" | column -t -s ":"

			exit 0
			;;
		*)
			vers+=("$1")
			;;
	esac
shift
done

for ver in "${vers[@]}"
do
	readonly path="/usr/local/go/$ver"
	readonly url="https://storage.googleapis.com/golang/go$ver.$goos-$goarch.tar.gz"

	# Most platforms I know require root to modify /usr/
	# Whateva.
	[ -d "$path" ] && echo "$path exists!" && exit 1 || sudo mkdir -p "$path"

	readonly me=$(whoami)
	sudo chown -R "$me:$me" $path

	# Download and extract to /usr/local/go/$ver
	curl "$url" | tar xz --strip-components=1 -C "$path"

	cd "$path/src" && ./make.bash
	sudo mv $GOPATH/bin/go "/usr/local/bin/go$ver"
	echo $(which "go$ver")
done