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+#!/bin/bash
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+#
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+# Copyright 2018 Bloomberg Finance LP
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+#
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+# This program is free software; you can redistribute it and/or
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+# modify it under the terms of the GNU Lesser General Public
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+# License as published by the Free Software Foundation; either
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+# version 2 of the License, or (at your option) any later version.
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+#
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+# This library is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+# Lesser General Public License for more details.
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+#
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+# You should have received a copy of the GNU Lesser General Public
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+# License along with this library. If not, see <http://www.gnu.org/licenses/>.
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+#
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+# Authors:
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+# Chadnan Singh <csingh43 bloomberg net>
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+
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+# This is a helper script to generate Docker images using checkouts of
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+# BuildStream elements.
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+
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+usage() {
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+ cat <<EOF
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+
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+USAGE: $(basename "$0") [-c BST_CMD] [-m MESSAGE] [-t TAG] [-h] ELEMENT
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+
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+Create a Docker image from bst checkout of an element.
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+
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+OPTIONS:
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+ -c BST_CMD Path to BuildStream command (default: bst).
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+ -m MESSAGE Commit message for the imported image.
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+ -t TAG Tag of the imported image.
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+ -h Print this help text and exit.
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+
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+EXAMPLES:
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+
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+ # Import hello.bst as a Docker image with tag "bst-hello" and message "hello"
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+ $(basename "$0") -m hello -t bst-hello hello.bst
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+
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+ # Import hello.bst as a Docker image with tag "bst-hello" using bst-here
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+ $(basename "$0") -c bst-here -t bst-hello hello.bst
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+
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+EOF
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+ exit "$1"
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+}
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+
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+die() {
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+ echo "FATAL: $1" >&2
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+ exit 1
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+}
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+
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+bst_cmd=bst
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+docker_import_cmd=(docker import)
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+docker_image_tag=
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+
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+while getopts c:m:t:h arg
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+do
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+ case $arg in
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+ c)
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+ bst_cmd="$OPTARG"
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+ ;;
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+ m)
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+ docker_import_cmd+=('-m' "$OPTARG")
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+ ;;
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+ t)
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+ docker_image_tag="$OPTARG"
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+ ;;
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+ h)
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+ usage 0
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+ ;;
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+ \?)
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+ usage 1
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+ esac
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+done
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+
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+shift $((OPTIND-1))
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+if [[ "$#" != 1 ]]; then
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+ echo "$0: No element specified" >&2
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+ usage 1
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+fi
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+element="$1"
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+
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+# Dump to a temporary file in the current directory.
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+# NOTE: We use current directory to try to ensure compatibility with scripts
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+# like bst-here, assuming that the current working directory is mounted
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+# inside the container.
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+
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+checkout_tar="bst-checkout-$(basename "$element")-$RANDOM.tar"
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+
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+echo "INFO: Checking out $element ..." >&2
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+$bst_cmd checkout --tar "$element" "$checkout_tar" || die "Failed to checkout $element"
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+echo "INFO: Successfully checked out $element" >&2
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+
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+echo "INFO: Importing Docker image ..."
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+"${docker_import_cmd[@]}" "$checkout_tar" "$docker_image_tag" || die "Failed to import Docker image from tarball"
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+echo "INFO: Successfully import Docker image $docker_image_tag"
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+
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+echo "INFO: Cleaning up ..."
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+rm "$checkout_tar" || die "Failed to remove $checkout_tar"
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+echo "INFO: Clean up finished"
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