[BUG] Compose Bridge nil pointer error when using models in docker-compose.yml

[vilatsut]

Description

I encountered a nil pointer evaluating interface {}.endpoint_var error when using Docker Compose Bridge to convert my docker-compose.yml file into Kubernetes manifests. The issue occurs when the models attribute is defined for a service without explicitly setting endpoint_var and model_var attributes, even though the documentation suggests these should be automatically handled.

Steps To Reproduce

1. Create the following docker-compose.yml file, with the DMR "short" syntax:

services:
  app:
    build: .
    ports:
      - "8000:8000"
    models:
      - ai_runner

models:
  ai_runner:
    model: ai/smollm2

2. Run the following command to convert the Compose file:

docker compose bridge convert 

3. Observe the error:

cannot execute template /templates/base/deployment.tmpl: template: deployment.tmpl:60:32: executing "deployment.tmpl" at <$value.endpoint_var>: nil pointer evaluating interface {}.endpoint_var

Compose Version

Docker Compose version v2.40.3-desktop.1
Docker Compose version v2.40.2-desktop.1

Docker Environment

lient:
 Version:    28.5.1
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  ai: Docker AI Agent - Ask Gordon (Docker Inc.)
    Version:  v1.9.11
    Path:     C:\Program Files\Docker\cli-plugins\docker-ai.exe
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.29.1-desktop.1
    Path:     C:\Program Files\Docker\cli-plugins\docker-buildx.exe
  compose: Docker Compose (Docker Inc.)
    Version:  v2.40.3-desktop.1
    Path:     C:\Users\vilatsut\.docker\cli-plugins\docker-compose.exe
  debug: Get a shell into any image or container (Docker Inc.)
    Version:  0.0.45
    Path:     C:\Program Files\Docker\cli-plugins\docker-debug.exe
  desktop: Docker Desktop commands (Docker Inc.)
    Version:  v0.2.0
    Path:     C:\Program Files\Docker\cli-plugins\docker-desktop.exe
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.31
    Path:     C:\Program Files\Docker\cli-plugins\docker-extension.exe
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v1.4.0
    Path:     C:\Program Files\Docker\cli-plugins\docker-init.exe
  mcp: Docker MCP Plugin (Docker Inc.)
    Version:  v0.24.0
    Path:     C:\Program Files\Docker\cli-plugins\docker-mcp.exe
  model: Docker Model Runner (Docker Inc.)
    Version:  v0.1.46
    Path:     C:\Users\vilatsut\.docker\cli-plugins\docker-model.exe
  offload: Docker Offload (Docker Inc.)
    Version:  v0.5.1
    Path:     C:\Program Files\Docker\cli-plugins\docker-offload.exe
  sandbox: Docker Sandbox (Docker Inc.)
    Version:  v0.3.1
    Path:     C:\Program Files\Docker\cli-plugins\docker-sandbox.exe
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     C:\Program Files\Docker\cli-plugins\docker-sbom.exe
  scout: Docker Scout (Docker Inc.)
    Version:  v1.18.3
    Path:     C:\Program Files\Docker\cli-plugins\docker-scout.exe

Server:
 Containers: 2
  Running: 0
  Paused: 0
  Stopped: 2
 Images: 12
 Server Version: 28.5.1
 Storage Driver: overlayfs
  driver-type: io.containerd.snapshotter.v1
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 CDI spec directories:
  /etc/cdi
  /var/run/cdi
 Discovered Devices:
  cdi: docker.com/gpu=webgpu
 Swarm: inactive
 Runtimes: runc io.containerd.runc.v2 nvidia
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 05044ec0a9a75232cad458027ca83437aae3f4da
 runc version: v1.2.5-0-g59923ef
 init version: de40ad0
 Security Options:
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.6.87.2-microsoft-standard-WSL2
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 8
 Total Memory: 15.56GiB
 Name: docker-desktop
 ID: 827c3a3d-8090-4ec9-8fcc-7f5b33354178
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Labels:
  com.docker.desktop.address=npipe://\\.\pipe\docker_cli
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5555
  ::1/128
  127.0.0.0/8
 Live Restore Enabled: false

Anything else?

https://docs.docker.com/ai/compose/models-and-compose/
https://docs.docker.com/compose/bridge/use-model-runner/