Fix Docker Compose install on Debian without compose apt package

- Install docker.io only; add compose plugin from apt or GitHub release
- Fail clearly if docker compose is still missing after install
- README notes Compose v2 fallback on Debian

README.md

@@ -26,7 +26,7 @@ sudo ./install-rubix.sh
 
 The script will:
 
-1. `apt update` / `upgrade`, install tools, **Docker** + compose plugin
+1. `apt update` / `upgrade`, install tools, **Docker** (`docker.io`) + Compose v2 plugin (apt or GitHub on Debian)
 2. Ask for your **Gitea token** (if `GITEA_TOKEN` is not already exported)
 3. Create **`/home/www/callcenter`** and download the latest **rubix** release
 

install-rubix.sh

@@ -24,7 +24,8 @@ GITEA_TOKEN="${GITEA_TOKEN:-${GITEA_REGISTRY_PULL_TOKEN:-}}"
 TAG="${1:-}"
 
 APT_PACKAGES=(unzip wget curl python3 ca-certificates git rsync)
-DOCKER_PACKAGES=(docker.io docker-compose-plugin)
+DOCKER_APT_PACKAGE="${DOCKER_APT_PACKAGE:-docker.io}"
+COMPOSE_PLUGIN_DIR="/usr/lib/docker/cli-plugins"
 
 prepare_system() {
   if [[ "$(id -u)" -ne 0 ]]; then
@@ -47,19 +48,50 @@ prepare_system() {
   ensure_docker
 }
 
+ensure_docker_compose_plugin() {
+  if docker compose version >/dev/null 2>&1; then
+    return 0
+  fi
+  if apt-cache show docker-compose-plugin >/dev/null 2>&1; then
+    echo "[install-rubix] apt-get install docker-compose-plugin ..."
+    apt-get install -y docker-compose-plugin
+    return 0
+  fi
+  echo "[install-rubix] docker-compose-plugin not in apt — fetching Compose v2 plugin ..."
+  local arch compose_arch url
+  arch="$(uname -m)"
+  case "${arch}" in
+    x86_64) compose_arch="x86_64" ;;
+    aarch64|arm64) compose_arch="aarch64" ;;
+    *)
+      echo "[install-rubix] ERROR: unsupported CPU for compose plugin: ${arch}" >&2
+      exit 1
+      ;;
+  esac
+  mkdir -p "${COMPOSE_PLUGIN_DIR}"
+  url="https://github.com/docker/compose/releases/latest/download/docker-compose-linux-${compose_arch}"
+  curl -fsSL "${url}" -o "${COMPOSE_PLUGIN_DIR}/docker-compose"
+  chmod +x "${COMPOSE_PLUGIN_DIR}/docker-compose"
+}
+
 ensure_docker() {
   if command -v docker >/dev/null 2>&1; then
     echo "[install-rubix] docker already installed: $(docker --version)"
   else
-    echo "[install-rubix] apt-get install ${DOCKER_PACKAGES[*]} ..."
+    echo "[install-rubix] apt-get install ${DOCKER_APT_PACKAGE} ..."
-    apt-get install -y "${DOCKER_PACKAGES[@]}"
+    apt-get install -y "${DOCKER_APT_PACKAGE}"
   fi
+  ensure_docker_compose_plugin
   systemctl enable --now docker
   if ! docker info >/dev/null 2>&1; then
     echo "[install-rubix] ERROR: docker installed but daemon not running." >&2
     exit 1
   fi
-  echo "[install-rubix] docker OK ($(docker compose version 2>/dev/null | head -1 || docker --version))"
+  if ! docker compose version >/dev/null 2>&1; then
+    echo "[install-rubix] ERROR: docker compose plugin missing after install." >&2
+    exit 1
+  fi
+  echo "[install-rubix] docker OK ($(docker compose version | head -1))"
 }
 
 prompt_token() {