r.sh should warn when docker-compose is missing

[nicolaiskogheim]

Why:

• The docker-compose command is required to run r.sh, because it calls docker compose, which uses the docker-compose command.
• The error when docker-compose is missing is unintelligible:

  $ docker compose --env-file ...
  unknown flag: --env-file
  See 'docker --help'.
  ...
  

This change addresses the need by:

• Checking for the presence of docker-compose and informing the user to install it.

---

Tested on Manjaro Linux. I don't know if docker/docker-compose is packaged differently on MacOS, so this should be tested there.

[Rathios]

Hi and thank you for the PR.

docker compose and docker-compose don't always both exist. E.g. on Ubuntu 24.04 you can install the Docker Compose plugin without having the old docker-compose installed (which is deprecated).

I recommend something OS agnostic that checks for both:

if docker compose > /dev/null 2>&1; then
  compose_cmd="docker compose"
elif command -v docker-compose; then
  compose_cmd="docker-compose"
else
  echo "Error: Docker Compose is not installed. Please install it and try again."
  exit 1
fi
$compose_cmd up openldap dex init-dex-db vault mongodb rabbitmq mongo-express redis ms-auth ms-kind ms-talos $@

More info here: https://stackoverflow.com/questions/66514436/difference-between-docker-compose-and-docker-compose

[havardelnan]

Hi and thx for the pr.

As described in https://docs.docker.com/compose/releases/migrate/#:~:text=From%20July%202023%20Compose%20V1,supported%20versions%20of%20Docker%20Desktop.

docker-compose is the deprecated v1 implementation of "docker compose" and "docker compose" is the v2 implementation.

So maybe a third option running

$ docker-compose version --short 
1.29.2

$ docker compose version --short
2.29.1

aka

if docker compose > /dev/null 2>&1; then
  compose_cmd="docker compose"
elif command -v docker-compose; then
  compose_cmd="docker-compose"
else
  echo "Error: Docker Compose is not installed. Please install it and try again."
  exit 1
fi
version=$($compose_cmd version --short | cut -d "." -f 1)
if [ "$version" -lt 2 ]; then
    echo "Docker Compose version is to low, needs to be v2.0.0 or higher."
    exit 1
fi

$compose_cmd up openldap dex init-dex-db vault mongodb rabbitmq mongo-express redis ms-auth ms-kind ms-talos $@

[havardelnan]

#290 will fix, sorry for the long wait