bottlecap

#!/usr/bin/env bash
set -euo pipefail

# bottlecap, 'cause it's kinda like cork... get it?

usage() {
	echo "usage:"
	echo "bottlecap [--dev] [--dry-run] [--runtime $runtime] [--build-dir $build_dir] [--container $container] assemblerargs..."
	echo "  --dev: rebuild and reinstall mantle and the build scripts before running coreos-assembler"
	echo "  --dry-run: do not run CoreOS Assembler; print what commands would be executed instead"
	echo "  --runtime: (auto) specify whether to use podman or docker. Defaults to podman if it is in \$PATH"
	echo "  --build-dir: Where to put build artifacts, defaults to the current directory"
	echo "  --container: which coreos-assembler container to use"
	echo "  --help: print this help message"
}

dev=0
dryrun=0
help=0
runtime="podman"
command -v podman > /dev/null || runtime="docker"
build_dir="$(pwd)"
container="quay.io/coreos-assembler/coreos-assembler"

rc=0
TEMP=$(getopt -o 'dr:b:c:h' --long 'dev,dry-run,runtime:,build-dir:,container:,help' -- "$@") || rc=$?
if [ "$rc" -ne 0 ]; then
	1>&2 echo "Bad arguments. getopt failed."
	usage
	exit 1
fi

eval set -- "$TEMP"

while :
do
	case "$1" in
		"-d"|"--dev")
	  		dev=1
			shift
			;;
		"--dry-run")
			dryrun=1
			shift
			;;
		"-r"|"--runtime")
			shift
			runtime="$1"
			shift
			;;
		"-b"|"--build-dir")
			shift
			build_dir=$(readlink -f "$1")
			shift
			;;
		"-c"|"--container")
			shift
			container="$1"
			shift
			;;
		"-h"|"--help")
			help=1
			shift
			;;
		--)
			shift
			break
			;;
		*)
			1>&2 echo "Error parsing args"
			exit 1
			;;
	esac
done

if [ "$help" = 1 ]; then
	usage
	exit 0
fi

script_dir=$(dirname "$(readlink -f "$0")")

volumes="-v $build_dir:/srv "

entrypoint=""

if [ "$dev" = 1 ]; then
	mkdir -p "$script_dir/.gocache"
	volumes="$volumes -v $script_dir:/host/src "
	volumes="$volumes -v $script_dir/.gocache:/root/.cache/go-build "
	entrypoint="--entrypoint /host/src/bottlecap-shim"
fi

if [ "$dryrun" = 1 ]; then
	# prefix $runtime with `echo` so the command is printed rather than executed
	runtime="echo $runtime"
	echo "Command to be executed:"
else
	set -x
fi

# we actually want work splitting here since $volumes is multiple args
# shellcheck disable=SC2086
$runtime run --rm -ti --device '/dev/kvm' $volumes --workdir /srv $entrypoint "$container" "$@"