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