jmri: version-aware install/upgrade via marker file

Replace binary-exists check with .jmri_installed_version marker pattern.
- Reads marker on each run; skips install if version matches
- On version mismatch: stops JMRI, wipes /opt/JMRI, downloads new archive
- Separates build hash into jmri_build_hash var (templated into download URL)
- Config is preserved — lives in git-managed .jmri symlink
To upgrade: bump jmri_version + jmri_build_hash, re-run playbook.

ansible/roles/jmri/defaults/main.yml

@@ -1,8 +1,12 @@
 ---
 # JMRI version to install
+# Update both jmri_version AND jmri_build_hash together when upgrading.
+# Find the build hash in the release asset filename on:
+# https://github.com/JMRI/JMRI/releases
 jmri_version: "5.10"
+jmri_build_hash: "ca461bd266"
 jmri_install_dir: /opt/JMRI
-jmri_download_url: "https://github.com/JMRI/JMRI/releases/download/v{{ jmri_version }}/JMRI.{{ jmri_version }}+Rca461bd266.tgz"
+jmri_download_url: "https://github.com/JMRI/JMRI/releases/download/v{{ jmri_version }}/JMRI.{{ jmri_version }}+R{{ jmri_build_hash }}.tgz"
 
 # Service user
 jmri_user: jmri

ansible/roles/jmri/tasks/main.yml

@@ -159,17 +159,55 @@
   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"
-  register: jmri_binary
+# ---------------------------------------------------------------------------
+# JMRI install / upgrade — version-marker pattern
+# Writes {{ jmri_install_dir }}/.jmri_installed_version after each install.
+# On subsequent runs: read the marker, skip everything if it matches
+# jmri_version. If it differs (or is absent), stop JMRI cleanly, wipe the
+# old install, download the new archive, extract, and write the new marker.
+# To upgrade: bump jmri_version + jmri_build_hash in defaults/main.yml (or
+# host_vars) and re-run the playbook.
+# ---------------------------------------------------------------------------
+
+- name: Read installed JMRI version marker (if present)
+  ansible.builtin.slurp:
+    src: "{{ jmri_install_dir }}/.jmri_installed_version"
+  register: jmri_version_marker
+  ignore_errors: true
+
+- name: Determine whether JMRI install/upgrade is needed
+  ansible.builtin.set_fact:
+    jmri_needs_install: >-
+      {{
+        jmri_version_marker is failed or
+        (jmri_version_marker.content | b64decode | trim) != jmri_version
+      }}
+
+- name: Stop JMRI service before upgrade (if running)
+  ansible.builtin.systemd:
+    name: jmri
+    state: stopped
+  failed_when: false   # service may not exist yet on first install
+  when: jmri_needs_install
+
+- name: Remove existing JMRI install directory (upgrade path)
+  ansible.builtin.file:
+    path: "{{ jmri_install_dir }}"
+    state: absent
+  when: jmri_needs_install
+
+- name: Remove stale JMRI archive from /tmp (if version changed)
+  ansible.builtin.file:
+    path: "/tmp/JMRI-{{ jmri_version }}.tgz"
+    state: absent
+  when: jmri_needs_install
 
 - 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
+  when: jmri_needs_install
 
 - name: Create JMRI install directory
   ansible.builtin.file:
@@ -187,7 +225,16 @@
     owner: "{{ jmri_user }}"
     group: "{{ jmri_group }}"
     extra_opts: ['--strip-components=1']
-  when: not jmri_binary.stat.exists
+  when: jmri_needs_install
+
+- name: Write installed version marker
+  ansible.builtin.copy:
+    content: "{{ jmri_version }}\n"
+    dest: "{{ jmri_install_dir }}/.jmri_installed_version"
+    owner: "{{ jmri_user }}"
+    group: "{{ jmri_group }}"
+    mode: '0644'
+  when: jmri_needs_install
 
 - name: Restore JMRI config from backup
   ansible.builtin.copy: