feat: add JMRI headless server role and main-street-station host

- New ansible/roles/jmri role: installs OpenJDK 21 headless, creates
  jmri service user, downloads JMRI 5.10, deploys JmriFaceless systemd unit
- Handles dialout group membership for serial device access
- Config restore task for post-reinstall recovery from GitHub backup
- host_vars/main-street-station: profile_id and serial device (TODO: fill in)
- Inventory: jmri_server group with main-street-station at 192.168.10.45
- Playbook: day1_deploy_jmri.yml (linux-baseline + jmri)

ansible/host_vars/main-street-station/main.yml

@@ -0,0 +1,16 @@
+---
+# Host-specific vars for main-street-station (JMRI headless server)
+# LCRR - Lake Country Railroad, Milwaukee Road Oct 1956, HO scale
+
+# JMRI profile ID — find with: ls ~/.jmri/profiles/ on the old box
+# Format: <name>.<8-char-hex>  e.g. LCRR.3d3f1dfc
+# TODO: fill in after restoring config from GitHub backup
+jmri_profile_id: ""
+
+# USB serial device for NCE command station
+# Verify after install: ls -la /dev/ttyUSB* /dev/ttyACM*
+jmri_serial_device: /dev/ttyUSB0
+
+# Path to JMRI config backup for restore task (leave empty to skip)
+# Point at a local checkout of the LCRR GitHub repo
+jmri_config_src: ""

ansible/inventory.yml

@@ -80,6 +80,13 @@ honcho_server:
       ansible_user: wed
       ansible_become: true
 
+jmri_server:
+  hosts:
+    main-street-station:
+      ansible_host: 192.168.10.45
+      ansible_user: wed
+      ansible_become: true
+
 papermc_server:
 # ansible-galaxy role install engonzal.papermc
   hosts:

ansible/playbooks/day1_deploy_jmri.yml

@@ -0,0 +1,24 @@
+---
+# ============================================================================
+# day1_deploy_jmri.yml
+# ----------------------------------------------------------------------------
+# Deploys JMRI JmriFaceless headless server on main-street-station.
+# Applies linux-baseline first, then the jmri role.
+#
+# Usage:
+#   ansible-playbook playbooks/day1_deploy_jmri.yml
+#   ansible-playbook playbooks/day1_deploy_jmri.yml -e target=main-street-station
+#
+# Prerequisites:
+#   1. Host is in inventory under jmri_server group
+#   2. jmri_profile_id is set in host_vars/main-street-station.yml
+#   3. SSH access as 'wed' with sudo
+# ============================================================================
+
+- name: Deploy JMRI headless server
+  hosts: "{{ target | default('jmri_server') }}"
+  become: true
+  gather_facts: true
+  roles:
+    - linux-baseline
+    - jmri

ansible/roles/jmri/defaults/main.yml

@@ -0,0 +1,25 @@
+---
+# JMRI version to install
+jmri_version: "5.10"
+jmri_install_dir: /opt/JMRI
+jmri_download_url: "https://github.com/JMRI/JMRI/releases/download/v{{ jmri_version }}/JMRI.{{ jmri_version }}+Rca461bd266.tgz"
+
+# Service user
+jmri_user: jmri
+jmri_group: jmri
+jmri_home: /home/jmri
+
+# Profile — override per-host in inventory
+# Find on the old box: ls ~/.jmri/profiles/
+jmri_profile_id: ""
+
+# Config restore source (path to the backed-up .jmri directory)
+jmri_config_src: ""
+
+# Ports (for documentation / firewall rules)
+jmri_json_port: 12080
+jmri_withrottle_port: 12090
+
+# USB serial device for NCE (set per-host in inventory)
+# e.g. /dev/ttyUSB0 or /dev/ttyACM0
+jmri_serial_device: /dev/ttyUSB0

ansible/roles/jmri/handlers/main.yml

@@ -0,0 +1,9 @@
+---
+- name: Reload systemd
+  ansible.builtin.systemd:
+    daemon_reload: true
+
+- name: Restart jmri
+  ansible.builtin.systemd:
+    name: jmri
+    state: restarted

ansible/roles/jmri/meta/main.yml

@@ -0,0 +1,13 @@
+---
+galaxy_info:
+  role_name: jmri
+  author: JARVIS
+  description: Deploy JMRI JmriFaceless headless server as a systemd service
+  license: MIT
+  min_ansible_version: "2.12"
+  platforms:
+    - name: Ubuntu
+      versions:
+        - jammy
+        - noble
+dependencies: []

ansible/roles/jmri/tasks/main.yml

@@ -0,0 +1,87 @@
+---
+- name: Install Java runtime (headless)
+  ansible.builtin.apt:
+    name: openjdk-21-jre-headless
+    state: present
+    update_cache: true
+
+- name: Create JMRI system group
+  ansible.builtin.group:
+    name: "{{ jmri_group }}"
+    state: present
+    system: true
+
+- name: Create JMRI service user
+  ansible.builtin.user:
+    name: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    home: "{{ jmri_home }}"
+    shell: /usr/sbin/nologin
+    system: true
+    create_home: true
+    state: present
+
+- name: Add JMRI user to dialout group (serial device access)
+  ansible.builtin.user:
+    name: "{{ jmri_user }}"
+    groups: dialout
+    append: true
+
+- name: Check if JMRI is already installed at correct version
+  ansible.builtin.stat:
+    path: "{{ jmri_install_dir }}/JmriFaceless"
+  register: jmri_binary
+
+- name: Download JMRI release archive
+  ansible.builtin.get_url:
+    url: "{{ jmri_download_url }}"
+    dest: /tmp/JMRI-{{ jmri_version }}.tgz
+    mode: '0644'
+  when: not jmri_binary.stat.exists
+
+- name: Create JMRI install directory
+  ansible.builtin.file:
+    path: "{{ jmri_install_dir }}"
+    state: directory
+    owner: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    mode: '0755'
+
+- name: Extract JMRI archive
+  ansible.builtin.unarchive:
+    src: /tmp/JMRI-{{ jmri_version }}.tgz
+    dest: "{{ jmri_install_dir }}"
+    remote_src: true
+    owner: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    extra_opts: ['--strip-components=1']
+  when: not jmri_binary.stat.exists
+
+- name: Restore JMRI config from backup
+  ansible.builtin.copy:
+    src: "{{ jmri_config_src }}/"
+    dest: "{{ jmri_home }}/.jmri/"
+    owner: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    mode: '0644'
+    directory_mode: '0755'
+  when: jmri_config_src | length > 0
+  notify: Restart jmri
+
+- name: Deploy JmriFaceless systemd unit
+  ansible.builtin.template:
+    src: jmri.service.j2
+    dest: /etc/systemd/system/jmri.service
+    owner: root
+    group: root
+    mode: '0644'
+  notify:
+    - Reload systemd
+    - Restart jmri
+
+- name: Enable and start JMRI service
+  ansible.builtin.systemd:
+    name: jmri
+    enabled: true
+    state: started
+    daemon_reload: true

ansible/roles/jmri/templates/jmri.service.j2

@@ -0,0 +1,35 @@
+[Unit]
+Description=JMRI Server (JmriFaceless)
+Documentation=https://www.jmri.org/
+After=network.target
+# Give USB devices time to enumerate after boot
+After=dev-{{ jmri_serial_device | basename }}.device
+Wants=dev-{{ jmri_serial_device | basename }}.device
+
+[Service]
+Type=simple
+User={{ jmri_user }}
+Group={{ jmri_group }}
+WorkingDirectory={{ jmri_install_dir }}
+
+# JmriFaceless requires a profile ID
+# Find yours: ls ~/.jmri/profiles/
+ExecStart={{ jmri_install_dir }}/JmriFaceless --profile={{ jmri_profile_id }}
+
+# Restart on failure, not on clean exit (e.g. intentional shutdown from Jython)
+Restart=on-failure
+RestartSec=10
+
+# Give hardware time to settle before retry
+TimeoutStartSec=30
+
+# Logging — view with: journalctl -u jmri -f
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=jmri
+
+# Serial device access
+SupplementaryGroups=dialout
+
+[Install]
+WantedBy=multi-user.target