install

#!/bin/bash
VERSION="1.19.2"

[ -z "$GOROOT" ] && GOROOT="$HOME/.go"
[ -z "$GOPATH" ] && GOPATH="$HOME/go"

case "$arch" in
  "64")
    PLATFORM="linux-arm64"
    ;;
  "32")
    PLATFORM="linux-armv6l"
    ;;
  *)
    error "arch variable is not set, can not continue"
    ;;
esac

if [ -z "$PLATFORM" ]; then
    echo "Your operating system is not supported by the script."
    exit 1
fi

if [ -n "$($SHELL -c 'echo $ZSH_VERSION')" ]; then
    shell_profile="$HOME/.zshrc"
elif [ -n "$($SHELL -c 'echo $BASH_VERSION')" ]; then
    shell_profile="$HOME/.bashrc"
elif [ -n "$($SHELL -c 'echo $FISH_VERSION')" ]; then
    shell="fish"
    if [ -d "$XDG_CONFIG_HOME" ]; then
        shell_profile="$XDG_CONFIG_HOME/fish/config.fish"
    else
        shell_profile="$HOME/.config/fish/config.fish"
    fi
fi

if [ ! -z "$1" ]; then
    echo "Unrecognized option: $1"
    exit 1
fi

if [ -d "$GOROOT" ]; then
    echo "The Go install directory ($GOROOT) already exists. Exiting."
    exit 1
fi

PACKAGE_NAME="go$VERSION.$PLATFORM.tar.gz"
TEMP_DIRECTORY=$(mktemp -d)

echo "Downloading $PACKAGE_NAME ..."
if hash wget 2>/dev/null; then
    wget https://storage.googleapis.com/golang/$PACKAGE_NAME -O "$TEMP_DIRECTORY/go.tar.gz"
else
    curl -o "$TEMP_DIRECTORY/go.tar.gz" https://storage.googleapis.com/golang/$PACKAGE_NAME
fi

if [ $? -ne 0 ]; then
    echo "Download failed! Exiting."
    exit 1
fi

echo "Extracting File..."
mkdir -p "$GOROOT"

tar -C "$GOROOT" --strip-components=1 -xzf "$TEMP_DIRECTORY/go.tar.gz"

echo "Configuring shell profile in: $shell_profile"
touch "$shell_profile"
if [ "$shell" == "fish" ]; then
    {
        echo '# GoLang'
        echo "set GOROOT '${GOROOT}'"
        echo "set GOPATH '$GOPATH'"
        echo 'set PATH $GOPATH/bin $GOROOT/bin $PATH'
    } >> "$shell_profile"
else
    {
        echo '# GoLang'
        echo "export GOROOT=${GOROOT}"
        echo 'export PATH=$GOROOT/bin:$PATH'
        echo "export GOPATH=$GOPATH"
        echo 'export PATH=$GOPATH/bin:$PATH'
    } >> "$shell_profile"
fi

mkdir -p "${GOPATH}/"{src,pkg,bin}
echo -e "\nGo $VERSION was installed into $GOROOT.\nMake sure to relogin into your shell or run:"
echo -e "\n\tsource $shell_profile\n\nto update your environment variables."
echo "Tip: Opening a new terminal window usually just works. :)"
rm -f "$TEMP_DIRECTORY/go.tar.gz"