#!/bin/bash

set -euxv

echo "$@"

function fail_one()
{
    echo >&2 "FAILURE when processing $CONTAINER_ID ($NAME_OF_CONTAINER), step: " "$@"
    RC=1
}


RC=0

for CONTAINER_ID
do

    echo "Processing $CONTAINER_ID"
    TMPFILE=$(mktemp)
    docker exec -u root $CONTAINER_ID bash -c "export LC_ALL=C ; apt-get update ; apt-get upgrade --dry-run" | tee $TMPFILE
    trap "rm $TMPFILE" EXIT
    if grep "0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded." $TMPFILE
    then
	echo "No update needed."
	continue
    fi

    PATH_OF_CONTAINER="$( docker inspect --format='{{ index .Config.Labels "com.docker.compose.project.working_dir" }}' $CONTAINER_ID )"
    NAME_OF_CONTAINER="$( docker inspect --format='{{ .Name }}' $CONTAINER_ID )"
    cd $PATH_OF_CONTAINER
    docker-compose pull || { fail_one "pull" ; continue ; }
    docker-compose build || { fail_one "build" ; continue ; }
    docker-compose up -d || { fail_one "switch to newly built container" ; continue ; }

done