install go from source code

install-go.sh

#!/usr/bin/env bash
set -e

cleanup() {
    echo "cleanup"
    rm -rf $HOME/.go
}

handle_exit() {
    if [ $? -ne 0 ]; then
        cleanup
        exit 1
    fi
}

set_cur_env() {
    # Add Go binaries to the PATH
    export PATH="$GOPATH/bin:$GOROOT/bin:$PATH"
    # Set the Go paths
    export GOROOT="$HOME/.go/goroot"
    export GOPATH="$HOME/.go/gopath"
    export GOROOT_BOOTSTRAP="$HOME/.go/gobootstrap"
}


# Set up the Go bootstrap
gobootstrap(){
    version=$(curl -s https://go.dev/dl/\?mode\=json | grep version | head -n 1 | sed 's/.*"version": "\(.*\)".*/\1/')
    os=$(uname -s | tr '[:upper:]' '[:lower:]')
    arch=$(uname -m)
    if [ "$arch" =  "x86_64" ]; then
        arch="amd64"
    elif [ "$arch" =  "aarch64" ]; then
        arch="arm64"
    fi
    filename="${version}.${os}-${arch}.tar.gz"
    url="https://go.dev/dl/$filename"
    echo "Downloading Go bootstrap"
    echo "URL: $url"

    # Download and extract the Go bootstrap
    mkdir -p "$HOME/.go"
    cd "$HOME/.go"
    wget "$url"
    tar -zxvf $filename
    mv "go" "gobootstrap"
    rm $filename
}

goroot(){
    # Set up the Go root
    echo "Setting up Go root"
    git clone https://go.googlesource.com/go "$HOME/.go/goroot"
    cd "$HOME/.go/goroot" && git checkout "$version"

    # Build Go from source
    echo "Building Go from source"
    cd "$HOME/.go/goroot/src"
    mkdir -p "$GOPATH"
    ./make.bash
}


update_env(){
    # Update the environment variables
    echo "Updating environment variables"
    echo "
export GOPATH=\"$HOME/.go/gopath\"
export GOROOT_BOOTSTRAP=\"$HOME/.go/gobootstrap\"
export GOROOT=\"$HOME/.go/goroot\"
export PATH=\"$GOPATH/bin:$GOROOT/bin:\$PATH\"
    " >> "$HOME/.zshrc"
}


trap handle_exit EXIT

# Set up the Go environment
echo "Setting up Go environment"

set_cur_env
gobootstrap
goroot
update_env