feat(jmri): headless JMRI server with Leviton layout power monitor and X11 GUI mode

- Stable udev device symlinks (/dev/jmri/nce, /dev/jmri/loconet, /dev/jmri/lcc)
- jmri-monitor: polls Leviton Decora Smart switch to start/stop JMRI automatically
  - Quiet hours 1-10 AM (no polling)
  - 30s off-delay before shutdown
- LCRR config cloned from Gitea (ssh://gitea.mk-labs.cloud:2221/rblundon/LCRR.git)
- ~/.jmri symlinked to LCRR repo for GitOps config management
- jmri-gui: X11 remote GUI access (PanelPro/DecoderPro) via ssh -X as jmri user
  - Stops daemon, launches GUI, restarts daemon on exit if layout still on
- jmri user gets login shell + SSH key for GUI sessions
- Full JRE installed (openjdk-21-jre) for AWT/X11 support

ansible/roles/jmri/tasks/main.yml

@@ -1,7 +1,9 @@
 ---
-- name: Install Java runtime (headless)
+- name: Install Java runtime (full — required for GUI mode)
   ansible.builtin.apt:
-    name: openjdk-21-jre-headless
+    name:
+      - openjdk-21-jre
+      - openjdk-21-jdk
     state: present
     update_cache: true
 
@@ -16,17 +18,147 @@
     name: "{{ jmri_user }}"
     group: "{{ jmri_group }}"
     home: "{{ jmri_home }}"
-    shell: /usr/sbin/nologin
+    shell: /bin/bash
     system: true
     create_home: true
     state: present
 
+- name: Deploy SSH authorized key for jmri user
+  ansible.posix.authorized_key:
+    user: "{{ jmri_user }}"
+    key: "{{ jmri_ssh_authorized_key }}"
+    state: present
+  when: jmri_ssh_authorized_key | length > 0
+
 - name: Add JMRI user to dialout group (serial device access)
   ansible.builtin.user:
     name: "{{ jmri_user }}"
     groups: dialout
     append: true
 
+# ---------------------------------------------------------------------------
+# Phase 1 — Stable udev device symlinks
+# Creates /dev/jmri/nce, /dev/jmri/loconet, /dev/jmri/lcc
+# ---------------------------------------------------------------------------
+- name: Create /dev/jmri symlink directory (static — survives reboots)
+  ansible.builtin.file:
+    path: /etc/jmri
+    state: directory
+    owner: root
+    group: root
+    mode: '0755'
+
+- name: Deploy udev rules for stable JMRI device symlinks
+  ansible.builtin.template:
+    src: 99-jmri-devices.rules.j2
+    dest: /etc/udev/rules.d/99-jmri-devices.rules
+    owner: root
+    group: root
+    mode: '0644'
+  notify: Reload udev
+
+# ---------------------------------------------------------------------------
+# Phase 2 — LocoNet traffic monitor
+# Installs jmri-monitor: watches /dev/jmri/loconet, starts/stops jmri.service
+# ---------------------------------------------------------------------------
+- name: Install python3-venv (monitor virtualenv support)
+  ansible.builtin.apt:
+    name: python3-venv
+    state: present
+
+- name: Create virtualenv for jmri-monitor
+  ansible.builtin.command:
+    cmd: python3 -m venv /opt/jmri-monitor
+    creates: /opt/jmri-monitor/bin/python3
+
+- name: Install decora_wifi into jmri-monitor virtualenv
+  ansible.builtin.pip:
+    name: decora_wifi
+    state: present
+    virtualenv: /opt/jmri-monitor
+
+- name: Deploy jmri-monitor script
+  ansible.builtin.template:
+    src: jmri-monitor.py.j2
+    dest: /usr/local/bin/jmri-monitor
+    owner: root
+    group: root
+    mode: '0755'
+  notify: Restart jmri-monitor
+
+- name: Deploy jmri-monitor systemd unit
+  ansible.builtin.template:
+    src: jmri-monitor.service.j2
+    dest: /etc/systemd/system/jmri-monitor.service
+    owner: root
+    group: root
+    mode: '0644'
+  notify:
+    - Reload systemd
+    - Restart jmri-monitor
+
+- name: Enable jmri-monitor service
+  ansible.builtin.systemd:
+    name: jmri-monitor
+    enabled: true
+    state: started
+    daemon_reload: true
+
+# ---------------------------------------------------------------------------
+# Phase 2b — LCRR config repo (clone/pull .jmri from Gitea)
+# ---------------------------------------------------------------------------
+- name: Ensure jmri .ssh directory exists
+  ansible.builtin.file:
+    path: /home/jmri/.ssh
+    state: directory
+    owner: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    mode: '0700'
+
+- name: Deploy jmri SSH config for Gitea
+  ansible.builtin.copy:
+    dest: /home/jmri/.ssh/config
+    owner: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    mode: '0600'
+    content: |
+      Host gitea.mk-labs.cloud
+          HostName gitea.mk-labs.cloud
+          User git
+          Port 2221
+          IdentityFile {{ jmri_gitea_key }}
+          StrictHostKeyChecking accept-new
+
+- name: Clone LCRR config repo if not present
+  ansible.builtin.git:
+    repo: "{{ jmri_lcrr_repo }}"
+    dest: "{{ jmri_home }}/LCRR"
+    version: main
+    accept_hostkey: true
+    key_file: "{{ jmri_gitea_key }}"
+    update: false
+  become_user: "{{ jmri_user }}"
+  when: jmri_lcrr_repo | length > 0
+  notify: Restart jmri
+
+- name: Remove auto-generated .jmri dir if it exists (will be replaced by symlink)
+  ansible.builtin.file:
+    path: "{{ jmri_home }}/.jmri"
+    state: absent
+  when:
+    - jmri_lcrr_repo | length > 0
+
+- name: Link .jmri config from LCRR repo
+  ansible.builtin.file:
+    src: "{{ jmri_home }}/LCRR/.jmri"
+    dest: "{{ jmri_home }}/.jmri"
+    state: link
+    owner: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    force: true
+  when: jmri_lcrr_repo | length > 0
+  notify: Restart jmri
+
 - name: Check if JMRI is already installed at correct version
   ansible.builtin.stat:
     path: "{{ jmri_install_dir }}/JmriFaceless"
@@ -79,9 +211,60 @@
     - Reload systemd
     - Restart jmri
 
-- name: Enable and start JMRI service
+- name: Enable jmri service (monitor manages start/stop — do not start directly)
   ansible.builtin.systemd:
     name: jmri
-    enabled: true
-    state: started
+    enabled: false
     daemon_reload: true
+
+# ---------------------------------------------------------------------------
+# Phase 3 — X11 remote GUI access
+# ---------------------------------------------------------------------------
+- name: Install xauth (required for SSH X11 forwarding)
+  ansible.builtin.apt:
+    name: xauth
+    state: present
+
+- name: Remove old jmri X11 sshd drop-in if present (renamed)
+  ansible.builtin.file:
+    path: /etc/ssh/sshd_config.d/20-jmri-x11.conf
+    state: absent
+  notify: Restart sshd
+
+- name: Deploy sshd drop-in to enable X11 forwarding (must load before hardening)
+  ansible.builtin.copy:
+    dest: /etc/ssh/sshd_config.d/09-jmri-x11.conf
+    owner: root
+    group: root
+    mode: '0644'
+    content: |
+      # Allow X11 forwarding for JMRI GUI sessions (jmri role)
+      # Must be numbered below 10-mk-labs-hardening.conf — first match wins.
+      X11Forwarding yes
+      X11UseLocalhost yes
+  notify: Restart sshd
+
+- name: Deploy jmri-gui script
+  ansible.builtin.template:
+    src: jmri-gui.j2
+    dest: /usr/local/bin/jmri-gui
+    owner: root
+    group: root
+    mode: '0755'
+
+- name: Deploy sudoers drop-in for jmri-gui (wed can manage jmri service)
+  ansible.builtin.copy:
+    dest: /etc/sudoers.d/jmri-gui
+    owner: root
+    group: root
+    mode: '0440'
+    validate: 'visudo -cf %s'
+    content: |
+      # jmri user can manage its own service (for jmri-gui interactive sessions)
+      jmri ALL=(root) NOPASSWD: /usr/bin/systemctl start jmri.service
+      jmri ALL=(root) NOPASSWD: /usr/bin/systemctl stop jmri.service
+      jmri ALL=(root) NOPASSWD: /opt/jmri-monitor/bin/python3
+      # wed retains service control for automation/admin use
+      wed ALL=(root) NOPASSWD: /usr/bin/systemctl start jmri.service
+      wed ALL=(root) NOPASSWD: /usr/bin/systemctl stop jmri.service
+      wed ALL=(root) NOPASSWD: /opt/jmri-monitor/bin/python3