Install go-gettable packages with temporary GOPATH

goinstall.bash

#!/usr/bin/env bash
# usage: goinstall [pkg ...]

if [[ -z $GOPATH ]]
then
	echo $(basename $0): requires GOPATH >&2
	exit 1
fi

IFS=: paths=($GOPATH)
dir=$(mktemp -d -t $(basename $0))
trap 'rm -rf $dir; exit 2' 1 2 3 15 EXIT

export GOPATH=$dir
go get -u -- $* || exit 1
for i in "${paths[@]}"
do
	if ! [[ -d "$i/bin" ]] || ! [[ -w "$i/bin" ]]
	then
		continue
	fi
	cp -p $GOPATH/bin/* "$i/bin" || exit 1
done