Zig updater script

zig-update.sh

#!/bin/bash
#
# allows installing and/or updating your local
# zig installation.
#
# adjust INSTALLDIR, ZIG_OS, ZIG_TARGET to
# configure your installation.
#
# prerequisites:
# - jq (https://stedolan.github.io/jq/)
# - curl (https://curl.haxx.se/)


INSTALLDIR=/home/felix/zig
ZIG_OS=linux
ZIG_TARGET=x86_64-${ZIG_OS}
JSON_SOURCE=https://ziglang.org/download/index.json
ZIG_VERSION=master
TEMPFILE=/tmp/zig-versions.json
VERSFILE=${INSTALLDIR}.version

function die()
{
	echo "$@" >&2
	exit 1
}

if test ! -d ${INSTALLDIR}; then
	echo "Installdir does not exist or is not a directory!"
	exit 1
fi

echo "Fetching metadata…"

curl -s "${JSON_SOURCE}" | jq ".\"${ZIG_VERSION}\".\"${ZIG_TARGET}\"" > ${TEMPFILE} || die "Failed to fetch metadata!"

TARBALL_SOURCE=$(jq --raw-output .tarball ${TEMPFILE})
TARBALL_SHASUM=$(jq --raw-output .shasum ${TEMPFILE})

if test -f "${VERSFILE}"; then
	if [ "${TARBALL_SHASUM}" == "$(cat ${VERSFILE})" ]; then
		echo "Everything up to date. Stopping."
		exit 0
	fi
fi

cd ${INSTALLDIR}

rm -rf ${INSTALLDIR}/*

echo "Downloading current version"

curl ${TARBALL_SOURCE} | unxz | tar -x || die "Failed to unpack tar archive!"

mv ${INSTALLDIR}/*/* ${INSTALLDIR}/ || die "Failed to move data to real folder."

rm -r ${INSTALLDIR}/zig-${ZIG_OS}-* || die "Failed to remove tar archive content."

echo ${TARBALL_SHASUM} > ${VERSFILE}

echo "Successfully installed zig $(./zig version)"

rm ${TEMPFILE}