build-environment-image

#!/bin/bash
set -e

SELFDIR=$(dirname "$0")
SELFDIR=$(cd "$SELFDIR" && pwd)
# shellcheck source=lib/library.sh
source "$SELFDIR/lib/library.sh"

FORMAT="fullstaq/ruby-build-env-%s"

function usage()
{
	echo "Usage: ./build-environment [OPTIONS] <NAME>"
	echo "Build a build environment Docker image. A build environment is an image based on"
	echo "a certain Linux distro, and is used to compile Ruby for that distro."
	echo
	echo "<NAME> is the name of a subdirectory in environments/, such as 'ubuntu-18.04'."
	echo
	echo "This script will produce a Docker image called"
	echo "'fullstaq/ruby-build-env-<NAME>'. You can change the name format with -f."
	echo
	echo "Optional options:"
	echo "  -f FORMAT  A format string that defines the output image name. Default: $FORMAT"
	echo "  -h         Show usage"
}

function parse_options()
{
	local OPTIND=1
	local ORIG_ARGV
	local opt
	while getopts "f:h" opt; do
		case "$opt" in
		f)
			FORMAT="$OPTARG"
			;;
		h)
			usage
			exit
			;;
		*)
			return 1
			;;
		esac
	done

	(( OPTIND -= 1 )) || true
	shift $OPTIND || true
	ORIG_ARGV=("$@")

	if [[ $# -ne 1 ]]; then
		usage
		exit 1
	fi
}

parse_options "$@"

NAME="$1"
IMAGE_NAME=$(printf "$FORMAT" "$NAME")
IMAGE_VERSION=$(read_single_value_file "$SELFDIR/environments/$NAME/image_tag")

if [[ ! -e "$SELFDIR/environments/$NAME" ]]; then
	echo "ERROR: $SELFDIR/environments/$NAME does not exist." >&2
	exit 1
fi

run docker build --pull -t "$IMAGE_NAME:$IMAGE_VERSION" "$SELFDIR/environments/$NAME"