Simple Go Version Management on Linux

gvm

#! /bin/bash

GVM_COMMAND=$1

GO_INSTALL_PATH=/usr/local/go

# if this is different, then change them...
OS=linux
ARCH=amd64

case $GVM_COMMAND in
    install)
        GO_VERSION=$2
        if [[ -z $GO_VERSION ]]; then
            echo 'ERROR: Go Version expected'
            exit 1
        fi

        if [[ -d "${GO_INSTALL_PATH}-${GO_VERSION}" ]]; then
            ${GO_INSTALL_PATH}-${GO_VERSION}/bin/go version
            exit 0
        fi

        echo "Installing $GO_VERSION"
        wget -P ${HOME} https://storage.googleapis.com/golang/go${GO_VERSION}.${OS}-${ARCH}.tar.gz
        mkdir -p ${HOME}/go-${GO_VERSION}
        tar -xf ${HOME}/go${GO_VERSION}.${OS}-${ARCH}.tar.gz -C ${HOME}/go-${GO_VERSION} --strip-components=1
        sudo mv ${HOME}/go-${GO_VERSION} /usr/local
        rm -rfv ${HOME}/go-${GO_VERSION}
        rm -rf ${HOME}/go${GO_VERSION}.${OS}-${ARCH}.tar.gz

        ${GO_INSTALL_PATH}-${GO_VERSION}/bin/go version
        ;;
    
    list)
        ls /usr/local | grep "go-" | sed 's/go-//'
        ;;

    use)
        GO_VERSION=$2
        if [[ -z $GO_VERSION ]]; then
            echo 'ERROR: Go Version expected'
            exit 1
        fi

        if [[ -d "${GO_INSTALL_PATH}-${GO_VERSION}" ]]
        then
            if [[ -d "${GO_INSTALL_PATH}" ]]; then
                sudo unlink ${GO_INSTALL_PATH}
            fi

            sudo ln -s "${GO_INSTALL_PATH}-${GO_VERSION}" "${GO_INSTALL_PATH}"
            ${GO_INSTALL_PATH}/bin/go version
        else
            echo "ERROR: Go version not found - try gvm install ${GO_VERSION} first"
        fi
        ;;
    
    rm)
        GO_VERSION=$2
        if [[ -z $GO_VERSION ]]; then
            echo 'ERROR: Go Version expected'
            exit 1
        fi

        if [[ -d "${GO_INSTALL_PATH}-${GO_VERSION}" ]]; then
            echo "Removing go version ${GO_VERSION}"
            sudo rm -rf "${GO_INSTALL_PATH}-${GO_VERSION}"
        fi

        # clean up the symlink
        sudo find ${GO_INSTALL_PATH} -xtype l -delete
        ;;

    *)
        # write a help output....
        echo "Unknown Command"
        ;;
esac