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#!/bin/bash
usage() {
cat << EOF
USAGE:
docker <SUBCOMMAND>
SUBCOMMANDS:
list List all the installed modules
prepare Prepare a sequences of install/remove commands
install Install a module
remove Uninstall a module
finalize Finalize a sequences of install/remove commands
EOF
}
unsupported_args_check() {
if [ -n "$1" ]; then
echo "Unsupported arguments: $*"
exit 1
fi
}
extract_image_tag_from_args() {
IMAGE_NAME="$1"
if [ -z "$IMAGE_NAME" ]; then
echo "Image name is a mandatory argument"
exit 1
fi
shift # Pop image name from args list
IMAGE_TAG=$IMAGE_NAME
if [ -n "$1" ]; then
case "$1" in
--module-version)
IMAGE_VERSION="$2"
IMAGE_TAG=$IMAGE_NAME:$IMAGE_VERSION
shift 2 # Pop --version and the version value from the args list
;;
*)
echo "Unsupported argument option: $1"
exit 1
;;
esac
fi
unsupported_args_check "$@"
}
if [ -z "$1" ]; then
echo -e "Provide at least one subcommand\n"
usage
exit 1
fi
COMMAND="$1"
shift # Pop the command from args list
case "$COMMAND" in
prepare)
unsupported_args_check "$@"
# nothing to do here
;;
list)
unsupported_args_check "$@"
docker image list --format '{{.Repository}}\t{{.Tag}}' || exit 2
;;
install)
# Extract the docker image tag into the IMAGE_TAG variable
extract_image_tag_from_args "$@"
# Stop all containers using the provided image name
containers=$(docker ps -a --format "{{.ID}} {{.Image}}" | grep "$IMAGE_NAME" | awk '{print $1}') || exit 2
if [ -z "$containers" ]
then
echo "No containers to update. Spawning a new one."
docker run -d "$IMAGE_TAG" || exit 2
else
echo "Updating existing containers."
for container in $containers
do
docker rm "$(docker stop "$container")" || exit 2
# Spawn new containers with the provided image name and version to replace the stopped one
docker run -d "$IMAGE_TAG" || exit 2
done
fi
;;
remove)
extract_image_tag_from_args "$@"
containers=$(docker ps -a --format "{{.ID}} {{.Image}}" | grep "$IMAGE_TAG" | awk '{print $1}') || exit 2
if [ -z "$containers" ]
then
echo "No containers found for the image: $IMAGE_TAG"
fi
for container in $containers
do
docker rm "$(docker stop "$container")" || exit 2
done
;;
finalize)
unsupported_args_check "$@"
# Prune all the unused images. The --force command is used to avoid a [y/N] user prompt
docker image prune --all --force || exit 2
;;
*)
echo "Unsupported command: $COMMAND"
exit 1
;;
esac
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