Initial commit: arr-stack homelab + local AI

Docker Compose media stack (gluetun, *arr, Jellyfin), Ternary-Bonsai AI
(Open WebUI, Forgejo, optional OpenHands), and Ansible bootstrap for the
SER5 Ubuntu host.

ansible/roles/users/handlers/main.yml

@@ -0,0 +1,6 @@
+---
+- name: Reload udev
+  ansible.builtin.shell: |
+    udevadm control --reload-rules
+    udevadm trigger
+  changed_when: true

ansible/roles/users/tasks/main.yml

@@ -0,0 +1,171 @@
+---
+# Local homelab operator account — broad permissions (LAN-trusted host)
+
+- name: Ensure stack user exists with bash shell
+  ansible.builtin.user:
+    name: "{{ stack_owner }}"
+    state: present
+    shell: /bin/bash
+    create_home: true
+    groups: "{{ extra_user_groups }}"
+    append: true
+  tags: [users, permissions]
+
+- name: Ensure useful system groups exist (create if missing)
+  ansible.builtin.group:
+    name: "{{ item }}"
+    state: present
+  loop: "{{ extra_user_groups }}"
+  failed_when: false
+  tags: [users, permissions]
+
+- name: Add stack user to all useful groups
+  ansible.builtin.user:
+    name: "{{ stack_owner }}"
+    groups: "{{ extra_user_groups }}"
+    append: true
+  tags: [users, permissions]
+
+- name: Passwordless sudo for stack user (full admin)
+  ansible.builtin.copy:
+    dest: "/etc/sudoers.d/{{ stack_owner }}"
+    mode: "0440"
+    owner: root
+    group: root
+    validate: "visudo -cf %s"
+    content: |
+      # Homelab operator — passwordless sudo (local trusted host)
+      {{ stack_owner }} ALL=(ALL) NOPASSWD:ALL
+      Defaults:{{ stack_owner }} !env_reset
+      Defaults:{{ stack_owner }} secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
+  tags: [users, permissions, sudo]
+
+- name: Allow stack user to manage Docker and arr-stack via systemctl without password
+  ansible.builtin.copy:
+    dest: "/etc/sudoers.d/{{ stack_owner }}-services"
+    mode: "0440"
+    owner: root
+    group: root
+    validate: "visudo -cf %s"
+    content: |
+      # Redundant with NOPASSWD:ALL; kept explicit for clarity if sudo is tightened later
+      {{ stack_owner }} ALL=(root) NOPASSWD: /bin/systemctl * docker*, /bin/systemctl * containerd*, /bin/systemctl * arr-stack*, /usr/bin/systemctl * docker*, /usr/bin/systemctl * containerd*, /usr/bin/systemctl * arr-stack*
+  tags: [users, permissions, sudo]
+
+- name: Install ACL tools
+  ansible.builtin.apt:
+    name: acl
+    state: present
+  tags: [users, permissions]
+
+- name: Own stack and storage roots
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: directory
+    owner: "{{ stack_owner }}"
+    group: "{{ stack_group }}"
+    mode: "0775"
+  loop:
+    - "{{ stack_root }}"
+    - "{{ storage_root }}"
+  tags: [users, permissions]
+
+- name: Recursive ownership of stack tree
+  ansible.builtin.file:
+    path: "{{ stack_root }}"
+    state: directory
+    owner: "{{ stack_owner }}"
+    group: "{{ stack_group }}"
+    recurse: true
+  tags: [users, permissions]
+
+- name: Recursive ownership of storage tree
+  ansible.builtin.file:
+    path: "{{ storage_root }}"
+    state: directory
+    owner: "{{ stack_owner }}"
+    group: "{{ stack_group }}"
+    recurse: true
+  # Large trees: may take a moment; safe to re-run
+  tags: [users, permissions]
+
+- name: Default ACLs so new files under stack stay group-writable
+  ansible.builtin.command: >
+    setfacl -R -d -m u:{{ stack_owner }}:rwx,g:{{ stack_group }}:rwx,o::r-x {{ item }}
+  loop:
+    - "{{ stack_root }}"
+    - "{{ storage_root }}"
+  changed_when: true
+  failed_when: false
+  tags: [users, permissions]
+
+- name: Current ACLs for stack owner full access
+  ansible.builtin.command: >
+    setfacl -R -m u:{{ stack_owner }}:rwx,g:{{ stack_group }}:rwx {{ item }}
+  loop:
+    - "{{ stack_root }}"
+    - "{{ storage_root }}"
+  changed_when: true
+  failed_when: false
+  tags: [users, permissions]
+
+- name: Discover DRM nodes for permission tweak
+  ansible.builtin.find:
+    paths: /dev/dri
+    patterns: "*"
+    file_type: any
+  register: dri_nodes
+  failed_when: false
+  tags: [users, permissions, gpu]
+
+- name: Make /dev/dri nodes world-accessible (trusted local host)
+  ansible.builtin.shell: |
+    set -e
+    if [ -d /dev/dri ]; then
+      chmod a+rw /dev/dri/* 2>/dev/null || true
+      ls -la /dev/dri
+    fi
+  register: dri_chmod
+  changed_when: "'rw' in dri_chmod.stdout"
+  failed_when: false
+  tags: [users, permissions, gpu]
+
+- name: Persist permissive DRM udev rule for trusted host
+  ansible.builtin.copy:
+    dest: /etc/udev/rules.d/99-homelab-dri-permissive.rules
+    mode: "0644"
+    content: |
+      # Trusted LAN homelab — allow any user/container access to GPU nodes
+      KERNEL=="renderD*", MODE="0666"
+      KERNEL=="card*",    MODE="0666"
+      KERNEL=="controlD*", MODE="0666"
+  notify: Reload udev
+  tags: [users, permissions, gpu]
+
+- name: Ensure docker socket is group-writable for docker group
+  ansible.builtin.file:
+    path: /var/run/docker.sock
+    group: docker
+    mode: "0660"
+  failed_when: false
+  tags: [users, permissions, docker]
+
+- name: Verify stack user can sudo without password
+  become: true
+  become_user: "{{ stack_owner }}"
+  ansible.builtin.command: sudo -n true
+  changed_when: false
+  tags: [users, permissions]
+
+- name: Show stack user identity and groups
+  become: true
+  become_user: "{{ stack_owner }}"
+  ansible.builtin.command: id
+  register: stack_user_id
+  changed_when: false
+  tags: [users, permissions]
+
+- name: Report stack user permissions
+  ansible.builtin.debug:
+    msg: "{{ stack_user_id.stdout }}"
+  tags: [users, permissions]