Create a new custom Go environment in a specified directory

newgoenv.sh

#!/bin/bash

GODOWNLOAD=go1.9.1.linux-amd64.tar.gz
GOURL=https://storage.googleapis.com/golang/$GODOWNLOAD

INSTALL_ARG=$1

if [ -z $INSTALL_ARG ]; then
    echo "Please specify an install location on the command line."
    exit 1
fi

if [ -d $INSTALL_ARG ]; then
    echo "The directory \"$INSTALL_ARG\" already exists.. quitting!"
    exit 1
fi

if [[ ${INSTALL_ARG:0:1} == "/" ]]; then
    INSTALL_LOCATION=$INSTALL_ARG
else
    INSTALL_LOCATION=$PWD/$INSTALL_ARG
fi

echo "Installing go environment to $INSTALL_LOCATION"

set -ex

wget -q -P $INSTALL_LOCATION $GOURL

tar -C $INSTALL_LOCATION -xf $INSTALL_LOCATION/$GODOWNLOAD

GOROOT=$INSTALL_LOCATION/go
GOPATH=$INSTALL_LOCATION/workspace

mkdir -p $GOPATH/{src,bin,pkg}

set +x

echo "Creating files to source:"
cat <<EOF > $INSTALL_LOCATION/activate
#!/bin/bash

export GOPATH=$GOPATH
export GOROOT=$GOROOT
export PATH=$GOPATH/bin:$GOROOT/bin:$PATH
EOF

chmod +x $INSTALL_LOCATION/activate

echo "Run \"source $INSTALL_LOCATION/activate\" to turn on the go environment at $INSTALL_LOCATION !"