executable_syd

#!/usr/bin/env bash
set -euo pipefail

CONTAINER_FLAGS=(
  --detach=true
  --tty=true
  --entrypoint=/usr/lib/systemd/systemd
  --env=container="docker"
  --stop-signal=SIGRTMIN+3
  --cgroupns=private
  --security-opt=writable-cgroups=true
  --tmpfs=/run
  --tmpfs=/run/lock
  --tmpfs=/tmp
)

HAS_ARGS=0

usage() {
  cat << EOF
Usage: syd [OPTIONS] IMAGE

Launch a system container with Docker using systemd-compatible configuration.

Arguments:
  IMAGE     Docker image to run (must always be in last position).

Options:
  -h, --help        Display this help message
  -n, --name NAME   Set container hostname

  Any other Docker run options can be passed as-is and will be added to the configuration.

Examples:
  # Launch a container with the default configuration:
  syd ghcr.io/f-bn/ubuntu:24.04-init

  # Launch a container with custom configurations:
  syd --name c1 --net=my-network ghcr.io/f-bn/ubuntu:24.04-init

EOF
}

while [[ $# -gt 0 ]]; do
  case $1 in
    -h|--help)
      usage ; exit 0 ;;
    -n|--name)
      CONTAINER_FLAGS+=(--name="$2" --hostname="$2");
      shift 2 ;;
    *)
      CONTAINER_FLAGS+=("$1"); HAS_ARGS=1;
      shift ;;
  esac
done

if [[ $HAS_ARGS -eq 0 ]]; then
  usage ; exit 0
fi

echo "Launching systemd container with Docker"
exec docker run "${CONTAINER_FLAGS[@]}"