goup: bash script to update to newest or specified version of go

goup

#!/usr/bin/env bash

# Gather machine information
_mch_arch=$(uname -m)
_mch_os=$(uname -s)
_mch_goVer=$(go version 2> /dev/null | awk '{print $3}' | sed 's/go//g')

if [ ${_mch_arch} = "x86_64" ]
then
    _mch_arch="amd64"
fi

# What version of Go are we installing?
if [ -z "${1}" ]
then
    goVerNewest=$(curl -ls "https://go.dev/VERSION?m=text")
    goVer=$(sed 's/go//g' <<< "${goVerNewest}")
    printf "goup: no version provided, will use latest: go${goVer}\n"
else
    goVer=$(sed 's/go//g' <<< "${1}")
fi

# Exit if go is currently installed and on the same version
if [ "${goVer}" = "${_mch_goVer}" ]; then printf "go version already installed: go${_mch_goVer}\n"; exit 0; fi

printf "goup: updating system to go${goVer}\n"

# Set install directory to either defined GOROOT or ~/.local/go
_install_dir="${GOROOT:-/usr/local/go}"
tmpdl=$(mktemp -d)

# Set download URL path
if ! GO_DL_OS=${_mch_os,,}; then GO_DL_OS=$(tr '[:upper:]' '[:lower:]' <<< "${_mch_os}"); fi
if ! GO_DL_ARCH=${_mch_arch,,}; then GO_DL_ARCH=$(tr '[:upper:]' '[:lower:]' <<< "${_mch_arch}"); fi
GO_DL_PATH="https://go.dev/dl/go${goVer}.${GO_DL_OS}-${GO_DL_ARCH}.tar.gz"

# Attempt to download and extract Go version
command pushd "${tmpdl}" > /dev/null
if ! curl -#OLf "${GO_DL_PATH}"
then
    printf "goup: failed to download go${goVer}. check if version exists.\n\t${GO_DL_PATH}\n"
    rm -rf "${tmpdl}"
    exit 1
fi
rm -rf "${_install_dir}/*"
tar -C "${_install_dir%/*}" -xzf *.tar.gz
command popd > /dev/null

# Cleanup
rm -rf "${tmpdl}"

if ! grep -q "${GOROOT}/bin" <<< "${PATH}"
then
    printf "\nGOROOT not found in \$PATH. Recommending to add to \$PATH:\n\techo 'export PATH=\"\$PATH:\$GOROOT/bin\"' >> .profile\n"
fi
if ! grep -q "${GOPATH}/bin" <<< "${PATH}"
then
    printf "\nGOPATH not found in \$PATH. Recommending to \$PATH:\n\techo 'export PATH=\"\$PATH:\$GOPATH/bin\"' >> .profile\n"
fi

go version