Get and install latest go in local home folder

fetch_go.sh

#!/bin/bash

# Script to download the latest stable Go version for Linux amd64/arm64
# Exit on any error
set -e

echo "Fetching Go downloads page..."

# Create a temporary file for the HTML content
TEMP_HTML=$(mktemp)
trap 'rm -f $TEMP_HTML' EXIT

# Download the Go downloads page
if ! curl -s https://go.dev/dl/ -o "$TEMP_HTML"; then
    echo "Error: Failed to download Go downloads page." >&2
    exit 1
fi

ARCH=$(uname -p)
echo $ARCH

if [ $ARCH = "aarch64" ]; then
	ARCH="arm64"
fi
if [ $ARCH = "x86_64" ]; then
	ARCH="amd64"
fi
echo "Processor architecture $ARCH"

# Extract the latest stable version
LATEST_VERSION=$(grep -o 'go[0-9]\+\.[0-9]\+\.[0-9]\+' "$TEMP_HTML" | grep -v "beta\|rc" | head -1)

if [ -z "$LATEST_VERSION" ]; then
    echo "Error: Failed to find the latest Go version." >&2
    exit 1
fi

echo "Latest stable Go version: $LATEST_VERSION"

function current_version() {
        if $(which go &> /dev/null); then
                go version | grep -oP "go[0-9.]+"
        else
                echo "UNINSTALLED"
        fi
}

	if ! [ "$(current_version)" == "$LATEST_VERSION" ]; then
		export GOROOT=$(go env | grep GOROOT | awk -F "=" '{print substr($2, 2, length($2) - 2)}')
		export GOPATH=$(go env | grep GOPATH | awk -F "=" '{print substr($2, 2, length($2) - 2)}')
		echo "updating $(current_version) to $LATEST_VERSION"
		# Form the download URL
		DOWNLOAD_URL="https://go.dev/dl/${LATEST_VERSION}.linux-${ARCH}.tar.gz"
		FILENAME="${LATEST_VERSION}.linux-${ARCH}.tar.gz"

		echo "Downloading $DOWNLOAD_URL..."

		# Download the Go tarball
		if ! curl -L "$DOWNLOAD_URL" -o "$FILENAME"; then
		    echo "Error: Failed to download Go tarball." >&2
		    exit 1
		fi

		# Verify the file exists and has content
		if [ ! -s "$FILENAME" ]; then
		    echo "Error: Downloaded file is empty or does not exist." >&2
		    exit 1
		fi

		# Report file size
		FILE_SIZE=$(du -h "$FILENAME" | cut -f1)
		echo "Success! Downloaded $FILENAME ($FILE_SIZE)"
		echo "File saved to $(pwd)/$FILENAME"

		echo "GOROOT = $GOROOT"
		echo "GOPATH = $GOPATH"
		export PATH=$PATH:~/go/bin
		rm -rf "$GOROOT" && tar -C $HOME/local -xzf "$FILENAME"
		echo "Installing useful packages..."
		echo "Air..."
		go install github.com/air-verse/air@latest
		echo "sqlc..."
		go install github.com/sqlc-dev/sqlc/cmd/sqlc@latest
		echo "Wails..."
		go install github.com/wailsapp/wails/v2/cmd/wails@latest
		echo "garble..."
		go install mvdan.cc/garble@latest
		echo "templ..."
		go install github.com/a-h/templ/cmd/templ@latest
		echo "global-update..."
		go install github.com/Gelio/go-global-update@latest
		echo "Ready"
		go-global-update
else
        echo "$(current_version) is up to date"
fi

exit 0