update-go

#!/bin/bash

set -e

if [ $# -ne 1 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
  echo "usage: update-go <version>"
  exit 1
fi

cur_version="$(go version | awk '{print $3}' | sed 's/go//')"

if [ "$cur_version" = "$1" ]; then
  echo "already using this version"
  exit 1
fi

if [ ! -d "$HOME/sdk/go${1}" ]; then
  go install golang.org/dl/go${1}@latest
  eval go${1} download
else
  echo "version already downloaded"
fi

rm -f "$HOME/sdk/latest"
ln -s "$HOME/sdk/go${1}" "$HOME/sdk/latest"

go version