dockerexport

#!/bin/bash 
#
#---------------------------------------
# Save docker container optimising space
# (C) M.A. O'Neill, Tumbling Dice 2023
#----------------------------------------
#---------------
# Display banner
#---------------

echo ""
echo "    dockerexport version 2.00"
echo "    (C) M.A. O'Neill, Tumbling Dice, 2023"
echo ""


#---------------------
# Is docker installed?
#---------------------

docker_installed= $(which dockerd |& grep "no")
if [ "$docker_installed" != "" ] ; then
        echo
        echo "    dockerexport ERROR: docker is not installed on this host"
        echo

        exit 255 
fi


#--------------------
# Is dockerd running?
#--------------------

dockerd_running=$(docker info |& head -1 |& awk '{print $1}' |& grep "Cannot")
if [ "$dockerd_running" != "" ] ; then
        echo
        echo "    dockerexport ERROR: dockerd is not running on this host"
        echo

        exit 255 
fi


#-----------------
# Parse parameters 
#-----------------

docker_repository=$(ask "    docker repository name")
if [ "$docker_repository" = "" ] ; then
	docker_repository="centos-ssh-dev"
	echo "    dockerexport WARNING: using default docker repository: '$docker_repository'"
	echo ""
elif [ "$docker_repository" = "q" ] || [ "$docker_repository" = "quit" ] ; then
        exit 1 
fi


docker_image=$(ask "    docker image name")
if [ "$docker_image" = "" ] ; then
	echo "    dockerexport ERROR: expecting docker image name"
	exit 255 
elif [ "$docker_image" = "q" ] || [ "$docker_image" = "quit" ] ; then
        exit 1
fi


docker_container=$(ask "    docker container name")
if [ "$docker_image" = "" ] ; then
	echo "    dockerexport ERROR: expecting docker container name"
	exit 255 
elif [ "$docker_container" == "q" ] || [ "$docker_container" = "quit" ] ; then
        exit 255 

fi


#-------
# Export
#-------

datestamp=$(date | awk '{print $2"-"$3"-"$4}')

echo ""
echo "    flattening container $docker_container and exporting it to ${docker_repository}:${docker_image}@${datestamp}.tar"
echo ""

docker export $docker_container 1> "${docker_repository}:${docker_image}@$datestamp.tar" 
if [ "$?" != 0 ] ; then
	echo ""
	echo "    dockerexport ERROR: export failed"
	echo ""

	exit 255
else
	echo ""
	echo "    finished"
	echo ""
fi

exit 0