Update all docker-compose projects to latest image

docker-update.sh

#!/bin/bash

msg() {
    # green
    echo -e "\e[32m==>\e[0m" "\e[1m$@\e[0m"
}

msg2() {
    # blue
    echo -e "\e[34m ->\e[0m" "\e[1m$@\e[0m"
}

warn() {
    # yellow
    echo -e "\e[33m==> WARNING:\e[0m" "\e[1m$@\e[0m"
}

err() {
    # red
    echo -e "\e[31m==> ERROR:\e[0m" "\e[1m$@\e[0m"
}

# docker images to update, eg. postgres:alpine
# replace with
#IMAGES=$(docker images --format '{{.Repository}}:{{.Tag}}')
# for all images.
IMAGES=(
)

# path to docker-compose projects
PROJECTS=(
)

msg "Updating images ..."
for img in ${IMAGES[*]}
do
    msg2 "Pulling $img"
    docker pull $img
done

msg "Restarting projects..."
for p in ${PROJECTS[*]}
do
    msg2 "Checking $p"
    dcy="$p/docker-compose.yml"
    deps=$(docker-compose -f $dcy images | awk '{ if (NR>2) { printf $2 "\n" } }')
    if [[ "$deps" =~ "<none>" ]];
    then
        docker-compose -f $dcy down
        docker-compose -f $dcy up -d
    else
        echo "Project is up-to-date"
    fi
done

msg "Cleaning dangling images..."
dangling=$(docker images --filter 'dangling=true' --quiet)
if [ -n "$dangling" ];
then
    docker rmi $dangling --force
else
    echo "Nothing to clean"
fi