*: add bottlecap, an optional entry point

Add bottlecap as the default entry point. It will handle launching the
coreos-assembler container and optionally binding in and rebuilding
certain aspects to aid development. This is in additon to the existing
flows.

.gitignore

@@ -2,3 +2,4 @@
 /target
 **/*.rs.bk
 src/__pycache__/*
+.gocache

bottlecap

@@ -0,0 +1,103 @@
+#!/bin/sh
+
+# bottlecap, 'cause it's kinda like cork... get it?
+
+usage() {
+	echo "usage:"
+	echo "bottlecap [--dev] [--dry-run] [--runtime $runtime] [--build-dir $build_dir]  [--container $container] assemblerargs..."
+	echo "  --dev: rebuild and reinstall mantle, the build scripts, and the ostree-releng-scipts before running coreos-assembler"
+	echo "  --dry-run: do not run CoreOS Assembler; print what commands would be executed instead"
+	echo "  --runtime: (auto) specify whether to use podman or docker. Defaults to podman if it is in \$PATH"
+	echo "  --build-dir: Where to put build artifacts, defaults to the current directory"
+	echo "  --container: which coreos-assembler container to use"
+	echo "  --help: print this help message"
+}
+
+dev=0
+dryrun=0
+help=0
+runtime="podman"
+command -v podman > /dev/null || runtime="docker"
+build_dir="$(pwd)"
+container="quay.io/cgwalters/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
+	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="$1"
+			shift
+			;;
+		"-h"|"--help")
+			help=1
+			shift
+			;;
+		--)
+			shift
+			break
+			;;
+		*)
+			echo "Error parsing args"
+			exit 1
+			;;
+	esac
+done
+
+if [ "$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 --net=host -ti --privileged --userns=host $volumes --workdir /srv $entrypoint "$container" "$@"

bottlecap-shim

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+pushd /host/src/
+sudo ./build.sh make_and_makeinstall
+popd
+
+exec /usr/bin/coreos-assembler $@