bvandeusenandClaude Opus 5.5
6a68bd75d9
#5766 "A root helper the agent can start, for a fixed set of maintenance actions and nothing else", milestone 514. The agent runs unprivileged under NoNewPrivileges, so it can't update or reboot its host. It now leaves a request in /var/lib/steward-agent/requests, the one path its unit lets it write; steward-maint.path starts maint.py as root, which reads it without following links, accepts only update, reboot, drain or undrain, deletes it, and writes the outcome to /var/lib/steward-maint/results. The agent (1.17.0) reports each new result state once as a `maintenance` event, re-checks pending updates when an update finishes, and says in its metadata whether the helper is installed. The units and the helper are served from one copy at /plugins/host_agent/files/<name> (a fixed list), and install.sh plus the install, provision and update playbooks all fetch them, replacing three inline copies of the unit. Update agent installs the helper on existing hosts; the Agent panel says under Manage agent whether it is there. Steward handing out jobs is #5767; the cadence is #5768. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
92 lines
3.4 KiB
YAML
92 lines
3.4 KiB
YAML
---
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# description: Update the Steward host agent (refresh agent.py, its units and the maintenance helper, then restart) on hosts already running it.
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# steward:category: host-agent
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# Update an already-installed Steward host agent: refresh agent.py, its systemd
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# units and the maintenance helper (#5766), then restart.
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#
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# Deliberately does NOT touch the registration token or /etc/steward-agent.conf
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# — the host already has a working token, so an update leaves identity alone and
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# only swaps the agent binary. Connects as the managed `steward` account (set
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# globally as the SSH user); no bootstrap password or token injection needed.
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#
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# For a fresh host with no agent, use provision.yml (new host) or install.yml
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# (already-provisioned host) instead — those mint and install the token.
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- name: Update Steward host agent
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hosts: all
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become: true
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gather_facts: false
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vars:
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steward_url: ""
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tasks:
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- name: Require steward_url
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ansible.builtin.assert:
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that:
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- steward_url | length > 0
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fail_msg: "Pass steward_url as an extra-var (the Update action sets it)."
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- name: Confirm the agent is already installed
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ansible.builtin.stat:
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path: /usr/local/lib/steward-agent/agent.py
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register: agent_file
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- name: Fail clearly if the agent is missing
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ansible.builtin.fail:
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msg: "No agent at /usr/local/lib/steward-agent — provision or install this host first."
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when: not agent_file.stat.exists
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- name: Refresh agent.py
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ansible.builtin.get_url:
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url: "{{ steward_url }}/plugins/host_agent/agent.py"
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dest: /usr/local/lib/steward-agent/agent.py
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mode: "0755"
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force: true
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notify: restart steward-agent
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# The units and the maintenance helper come from Steward: one copy for
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# install.sh and every playbook (#5766). The agent may write only its
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# request directory; the helper and its results stay root's.
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- name: Create the maintenance directories
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ansible.builtin.file:
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path: "{{ item.path }}"
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state: directory
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owner: "{{ item.owner }}"
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group: "{{ item.owner }}"
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mode: "{{ item.mode }}"
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loop:
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- {path: /var/lib/steward-agent, owner: root, mode: "0755"}
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- {path: /var/lib/steward-agent/requests, owner: steward-agent, mode: "0700"}
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- {path: /var/lib/steward-maint, owner: root, mode: "0755"}
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- {path: /var/lib/steward-maint/results, owner: root, mode: "0755"}
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- name: Download the maintenance helper
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ansible.builtin.get_url:
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url: "{{ steward_url }}/plugins/host_agent/files/maint.py"
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dest: /usr/local/lib/steward-agent/maint.py
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owner: root
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mode: "0755"
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force: true
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- name: Install the agent and maintenance units
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ansible.builtin.get_url:
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url: "{{ steward_url }}/plugins/host_agent/files/{{ item }}"
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dest: "/etc/systemd/system/{{ item }}"
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owner: root
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mode: "0644"
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force: true
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loop: [steward-agent.service, steward-maint.service, steward-maint.path]
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notify: restart steward-agent
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- name: Watch for maintenance requests
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ansible.builtin.systemd:
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name: steward-maint.path
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enabled: true
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state: started
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daemon_reload: true
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handlers:
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- name: restart steward-agent
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ansible.builtin.systemd:
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name: steward-agent
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state: restarted
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daemon_reload: true
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