wait user existence

gistfile1.txt

# wrap process and wait while required user would be created (for daemon ex. php-fpm) and others external init scripts would produced
# using USER=www-data wait-init.sh php-fpm

# test
# docker run --name=wait-init-test --rm -v $PWD/wait-init.sh:/wait-init.sh -e USER=www-data alpine sh wait-init.sh su -c "echo \"Dummy daemon started under \$(whoami)\"" www-data
# create user in container with some dockerhost id
# docker exec wait-init-test adduser -D --uid ${UID} www-data

# daemon required username
if [[ -z "${USER}" ]]; then
	user="dockerhostuser" 	
else
	user=$USER
fi;

echo "Waiting container init for user \"$user\"..."

while :
do
	if id -u $user >/dev/null 2>&1; then
		echo "Initialized container. Done!"
		break;
	else
		sleep 3
	fi
done

if [[ ! -z $@ ]]; then
    echo  "Run $@";
    exec "$@";
fi;