executable_syd

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

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:
  Any Docker run options can be passed and will be added to the default configuration.

Examples:
  syd ghcr.io/f-bn/ubuntu:24.04-init
  syd --name my-container --net=my-network ghcr.io/f-bn/ubuntu:24.04-init

EOF
}

FLAGS=(
  --tty=true
  --entrypoint=/sbin/init
  --env=container="docker"
  --stop-signal=SIGRTMIN+3
  --cgroupns=host
  --cgroup-parent=machine.slice
  --volume=/sys/fs/cgroup:/sys/fs/cgroup:rw
  --tmpfs=/run
  --tmpfs=/run/lock
  --tmpfs=/tmp
)
HAS_ARGS=0

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

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

echo "Launching systemd container with Docker"
CONTAINER=$(docker create "${FLAGS[@]}") || exit 1

exec docker start "${CONTAINER}"