upgrade go binary

#!/bin/bash
set -o errexit

function _upgrade_go_binary {
    
    go_latest_version=$(curl --silent https://go.dev/doc/devel/release | grep -Eo 'go[0-9]+(\.[0-9]+)+' | sort -V | uniq | tail -1)
    
    # go_latest_version="go1.20rc3"
    
    
    if [[ $go_latest_version == "" ]]; then
        echo "Skipping Go binary upgrade (no version found)."
        return
    fi
    
    
    if [ -d ~/Sdk/go/$go_latest_version ]; then
        echo "Lastest version of Go already installed, skipping upgrade."
        return
    fi
    
    [[ $(hash go 2>/dev/null) ]] && go version
    echo "Upgrading to $go_latest_version"
    
    # compatible with Linux and Darwin (maybe windows too)
    local GO_LATEST_FILENAME="$go_latest_version.$(uname -s | \
    tr '[:upper:]' '[:lower:]')-amd64.tar.gz"
    echo "Downloading $GO_LATEST_FILENAME to ~/.bin/go/$GO_LATEST_FILENAME"
    wget https://dl.google.com/go/$GO_LATEST_FILENAME -O /tmp/$GO_LATEST_FILENAME
    
    echo "Installing $GO_LATEST_FILENAME"
    cd ~/Sdk/go
    tar zxf /tmp/$GO_LATEST_FILENAME
    rm /tmp/$GO_LATEST_FILENAME
    mv go $go_latest_version
    ln -sfn ~/Sdk/go/$go_latest_version ~/Sdk/go/current
    
    go version
}
if [[ -d ~/Sdk/go ]]; then
    _upgrade_go_binary
    echo "Skipped upgrading binary. source is now paged."
else
    echo "No custom ~/Sdk/go/ detected.  Using system installed version."
fi
unset _upgrade_go_binary

if [[ ! -x "$(which go)" ]]; then
    echo "Go is not installed. Exiting."
    exit 3
fi
Related
