chore: initial commit with scaffolding and design doc
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design.md
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design.md
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# homelab-deploy Design Document
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A message-based deployment system for NixOS configurations using NATS for messaging. This binary runs in multiple modes to enable on-demand NixOS configuration updates across a fleet of hosts.
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## Overview
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The `homelab-deploy` binary provides three operational modes:
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1. **Listener mode** - Runs on each NixOS host as a systemd service, subscribing to NATS subjects and executing `nixos-rebuild` when deployment requests arrive
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2. **MCP mode** - Runs as an MCP (Model Context Protocol) server, exposing deployment tools for AI assistants
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3. **CLI mode** - Manual deployment commands for administrators
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## Architecture
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```
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┌─────────────┐ ┌─────────────┐
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│ MCP Tool │ deploy.test.> │ Admin CLI │ deploy.test.> + deploy.prod.>
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│ │────────────┐ ┌─────│ │
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└─────────────┘ │ │ └─────────────┘
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▼ ▼
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┌──────────────┐
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│ NATS Server │
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│ (authz) │
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└──────┬───────┘
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│
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┌─────────────────┼─────────────────┐
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│ │ │
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▼ ▼ ▼
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┌──────────┐ ┌──────────┐ ┌──────────┐
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│ host-a │ │ host-b │ │ host-c │
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│ tier=test│ │ tier=prod│ │ tier=prod│
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└──────────┘ └──────────┘ └──────────┘
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```
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## Repository Structure
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```
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homelab-deploy/
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├── flake.nix # Nix flake with Go package + NixOS module
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├── go.mod
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├── go.sum
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├── cmd/
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│ └── homelab-deploy/
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│ └── main.go # CLI entrypoint with subcommands
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├── internal/
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│ ├── listener/ # Listener mode logic
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│ ├── mcp/ # MCP server mode logic
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│ ├── nats/ # NATS client wrapper
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│ └── deploy/ # Shared deployment execution logic
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└── nixos/
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└── module.nix # NixOS module for listener service
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```
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## CLI Interface
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```bash
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# Listener mode (runs as systemd service on each host)
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homelab-deploy listener \
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--hostname <hostname> \
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--tier <test|prod> \
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--nats-url nats://server:4222 \
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--nkey-file /path/to/listener.nkey \
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--flake-url <git+https://...> \
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[--role <role>] \
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[--timeout 600]
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# MCP server mode (for AI assistants)
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homelab-deploy mcp \
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--nats-url nats://server:4222 \
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--nkey-file /path/to/mcp.nkey \
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[--enable-admin --admin-nkey-file /path/to/admin.nkey]
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# CLI commands for manual use
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homelab-deploy deploy <hostname> \
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--nats-url nats://server:4222 \
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--nkey-file /path/to/deployer.nkey \
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[--branch <branch>] \
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[--action <switch|boot|test|dry-activate>]
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homelab-deploy deploy \
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--tier <test|prod> \
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--all \
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--nats-url nats://server:4222 \
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--nkey-file /path/to/deployer.nkey \
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[--branch <branch>] \
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[--action <switch|boot|test|dry-activate>]
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homelab-deploy deploy \
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--tier <test|prod> \
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--role <role> \
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--nats-url nats://server:4222 \
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--nkey-file /path/to/deployer.nkey \
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[--branch <branch>] \
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[--action <switch|boot|test|dry-activate>]
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```
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## NATS Subject Structure
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Subjects follow the pattern `deploy.<tier>.<target>`:
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| Subject Pattern | Description |
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|-----------------|-------------|
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| `deploy.<tier>.<hostname>` | Deploy to specific host (e.g., `deploy.prod.ns1`) |
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| `deploy.<tier>.all` | Deploy to all hosts in tier (e.g., `deploy.test.all`) |
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| `deploy.<tier>.role.<role>` | Deploy to hosts with role in tier (e.g., `deploy.prod.role.dns`) |
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| `deploy.responses.<request-id>` | Response subject for request/reply pattern |
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## Listener Mode
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### Responsibilities
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1. Connect to NATS using NKey authentication
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2. Subscribe to subjects based on hostname, tier, and role
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3. Validate incoming deployment requests
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4. Execute `nixos-rebuild` with the specified parameters
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5. Report status back via NATS reply subject
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### Subject Subscriptions
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A listener subscribes to multiple subjects based on its configuration:
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- `deploy.<tier>.<hostname>` - Direct messages to this host
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- `deploy.<tier>.all` - Broadcast to all hosts in tier
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- `deploy.<tier>.role.<role>` - Broadcast to hosts with matching role (only if role is configured)
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**Example:** A host with `hostname=ns1, tier=prod, role=dns` subscribes to:
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- `deploy.prod.ns1`
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- `deploy.prod.all`
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- `deploy.prod.role.dns`
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### Message Formats
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**Request message:**
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```json
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{
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"action": "switch",
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"revision": "master",
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"reply_to": "deploy.responses.abc123"
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}
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```
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| Field | Type | Required | Description |
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|-------|------|----------|-------------|
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| `action` | string | yes | One of: `switch`, `boot`, `test`, `dry-activate` |
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| `revision` | string | yes | Git branch name or commit hash |
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| `reply_to` | string | yes | Subject to publish responses to |
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**Response message:**
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```json
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{
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"hostname": "ns1",
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"status": "completed",
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"error": null,
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"message": "Successfully switched to generation 42"
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}
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```
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| Field | Type | Description |
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|-------|------|-------------|
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| `hostname` | string | The responding host's name |
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| `status` | string | One of: `accepted`, `rejected`, `started`, `completed`, `failed` |
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| `error` | string or null | Error code if status is `rejected` or `failed` |
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| `message` | string | Human-readable details |
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**Error codes:**
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- `invalid_revision` - The specified branch/commit does not exist
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- `invalid_action` - The action is not recognized
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- `already_running` - A deployment is already in progress on this host
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- `build_failed` - nixos-rebuild exited with non-zero status
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- `timeout` - Deployment exceeded the configured timeout
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### Request/Reply Flow
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1. Deployer sends request with unique `reply_to` subject
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2. Deployer subscribes to the `reply_to` subject before sending
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3. Listener validates request:
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- Checks revision exists using `git ls-remote`
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- Checks no other deployment is running
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4. Listener sends immediate response:
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- `{"status": "rejected", ...}` if validation fails, or
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- `{"status": "started", ...}` if deployment begins
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5. If started, listener executes nixos-rebuild
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6. Listener sends final response:
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- `{"status": "completed", ...}` on success, or
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- `{"status": "failed", ...}` on failure
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### Deployment Execution
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The listener executes `nixos-rebuild` with the following command pattern:
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```bash
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nixos-rebuild <action> --flake <flake-url>?ref=<revision>#<hostname>
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```
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Where:
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- `<action>` is one of: `switch`, `boot`, `test`, `dry-activate`
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- `<flake-url>` is the configured git flake URL (e.g., `git+https://git.example.com/user/nixos-configs.git`)
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- `<revision>` is the branch name or commit hash from the request
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- `<hostname>` is the listener's configured hostname
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**Environment requirements:**
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- Must run as root (nixos-rebuild requires root)
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- Nix must be configured with proper git credentials if the flake is private
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- Network access to the git repository
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### Concurrency Control
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Only one deployment may run at a time per host. The listener maintains a simple lock:
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- Before starting a deployment, acquire lock
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- If lock is held, reject with `already_running` error
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- Release lock when deployment completes (success or failure)
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- Lock should be in-memory (no persistence needed - restarts clear it)
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### Logging
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All deployment events should be logged to stdout/stderr (captured by systemd journal):
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- Request received (with subject, action, revision)
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- Validation result
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- Deployment start
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- Deployment completion (with exit code)
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- Any errors
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This enables integration with log aggregation systems (e.g., Loki via Promtail).
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## MCP Mode
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### Purpose
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Exposes deployment functionality as MCP tools for AI assistants (e.g., Claude Code).
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### Tools
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| Tool | Description | Parameters |
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|------|-------------|------------|
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| `deploy` | Deploy to test-tier hosts | `hostname` or `all`, optional `role`, `branch`, `action` |
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| `deploy_admin` | Deploy to any tier (requires `--enable-admin`) | `tier`, `hostname` or `all`, optional `role`, `branch`, `action` |
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| `list_hosts` | List available deployment targets | `tier` (optional) |
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### Tool Schemas
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**deploy:**
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```json
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{
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"name": "deploy",
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"description": "Deploy NixOS configuration to test-tier hosts",
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"inputSchema": {
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"type": "object",
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"properties": {
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"hostname": {
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"type": "string",
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"description": "Target hostname, or omit to use 'all' or 'role' targeting"
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},
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"all": {
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"type": "boolean",
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"description": "Deploy to all test-tier hosts"
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},
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"role": {
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"type": "string",
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"description": "Deploy to all test-tier hosts with this role"
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},
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"branch": {
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"type": "string",
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"description": "Git branch or commit to deploy (default: master)"
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},
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"action": {
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"type": "string",
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"enum": ["switch", "boot", "test", "dry-activate"],
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"description": "nixos-rebuild action (default: switch)"
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}
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}
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}
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}
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```
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**deploy_admin:**
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```json
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{
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"name": "deploy_admin",
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"description": "Deploy NixOS configuration to any host (admin access required)",
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"inputSchema": {
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"type": "object",
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"properties": {
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"tier": {
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"type": "string",
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"enum": ["test", "prod"],
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"description": "Target tier"
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},
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"hostname": {
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"type": "string",
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"description": "Target hostname, or omit to use 'all' or 'role' targeting"
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},
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"all": {
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"type": "boolean",
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"description": "Deploy to all hosts in tier"
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},
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"role": {
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|
"type": "string",
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||||||
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"description": "Deploy to all hosts with this role in tier"
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|
},
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|
"branch": {
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|
"type": "string",
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||||||
|
"description": "Git branch or commit to deploy (default: master)"
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|
},
|
||||||
|
"action": {
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||||||
|
"type": "string",
|
||||||
|
"enum": ["switch", "boot", "test", "dry-activate"],
|
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|
"description": "nixos-rebuild action (default: switch)"
|
||||||
|
}
|
||||||
|
},
|
||||||
|
"required": ["tier"]
|
||||||
|
}
|
||||||
|
}
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|
```
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|
||||||
|
**list_hosts:**
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||||||
|
```json
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|
{
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||||||
|
"name": "list_hosts",
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||||||
|
"description": "List available deployment targets",
|
||||||
|
"inputSchema": {
|
||||||
|
"type": "object",
|
||||||
|
"properties": {
|
||||||
|
"tier": {
|
||||||
|
"type": "string",
|
||||||
|
"enum": ["test", "prod"],
|
||||||
|
"description": "Filter by tier (optional)"
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
### Security Layers
|
||||||
|
|
||||||
|
1. **MCP flag**: `deploy_admin` tool only registered when `--enable-admin` is passed
|
||||||
|
2. **NATS authz**: MCP credentials can only publish to authorized subjects
|
||||||
|
3. **AI assistant permissions**: The assistant's configuration can require confirmation for admin operations
|
||||||
|
|
||||||
|
### Multi-Host Deployments
|
||||||
|
|
||||||
|
When deploying to multiple hosts (via `all` or `role`), the MCP should:
|
||||||
|
1. Publish the request to the appropriate broadcast subject
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||||||
|
2. Collect responses from all responding hosts
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||||||
|
3. Return aggregated results showing each host's status
|
||||||
|
|
||||||
|
**Timeout handling:**
|
||||||
|
- Set a reasonable timeout for collecting responses (e.g., 30 seconds after last response, or max 15 minutes)
|
||||||
|
- Return partial results if some hosts don't respond
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||||||
|
- Indicate which hosts did not respond
|
||||||
|
|
||||||
|
### Host Discovery
|
||||||
|
|
||||||
|
The `list_hosts` tool needs to know available hosts. Options:
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||||||
|
1. **Static configuration**: Read from a config file or environment variable
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||||||
|
2. **NATS request**: Publish to a discovery subject and collect responses from listeners
|
||||||
|
|
||||||
|
Recommend option 2: Listeners respond to `deploy.discover` with their metadata:
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||||||
|
```json
|
||||||
|
{
|
||||||
|
"hostname": "ns1",
|
||||||
|
"tier": "prod",
|
||||||
|
"role": "dns"
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
## NixOS Module
|
||||||
|
|
||||||
|
The NixOS module configures the listener as a systemd service.
|
||||||
|
|
||||||
|
### Module Options
|
||||||
|
|
||||||
|
```nix
|
||||||
|
{
|
||||||
|
options.services.homelab-deploy.listener = {
|
||||||
|
enable = lib.mkEnableOption "homelab-deploy listener service";
|
||||||
|
|
||||||
|
hostname = lib.mkOption {
|
||||||
|
type = lib.types.str;
|
||||||
|
description = "Hostname for this listener (used for NATS subject)";
|
||||||
|
};
|
||||||
|
|
||||||
|
tier = lib.mkOption {
|
||||||
|
type = lib.types.enum [ "test" "prod" ];
|
||||||
|
description = "Deployment tier for this host";
|
||||||
|
};
|
||||||
|
|
||||||
|
role = lib.mkOption {
|
||||||
|
type = lib.types.nullOr lib.types.str;
|
||||||
|
default = null;
|
||||||
|
description = "Role for role-based deployment targeting";
|
||||||
|
};
|
||||||
|
|
||||||
|
natsUrl = lib.mkOption {
|
||||||
|
type = lib.types.str;
|
||||||
|
description = "NATS server URL";
|
||||||
|
};
|
||||||
|
|
||||||
|
nkeyFile = lib.mkOption {
|
||||||
|
type = lib.types.path;
|
||||||
|
description = "Path to NKey seed file for NATS authentication";
|
||||||
|
};
|
||||||
|
|
||||||
|
flakeUrl = lib.mkOption {
|
||||||
|
type = lib.types.str;
|
||||||
|
description = "Git flake URL for nixos-rebuild";
|
||||||
|
};
|
||||||
|
|
||||||
|
timeout = lib.mkOption {
|
||||||
|
type = lib.types.int;
|
||||||
|
default = 600;
|
||||||
|
description = "Deployment timeout in seconds";
|
||||||
|
};
|
||||||
|
};
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
### Systemd Service
|
||||||
|
|
||||||
|
The module should create a systemd service with:
|
||||||
|
- `Type=simple`
|
||||||
|
- `Restart=always`
|
||||||
|
- `RestartSec=10`
|
||||||
|
- Run as root (required for nixos-rebuild)
|
||||||
|
- Proper ordering (after network-online.target)
|
||||||
|
- Resource limits if desired
|
||||||
|
|
||||||
|
## NATS Authentication
|
||||||
|
|
||||||
|
All NATS connections use NKey authentication. NKeys are ed25519 keypairs where:
|
||||||
|
- The seed (private key) is stored in a file readable by the service
|
||||||
|
- The public key is configured in the NATS server's user list
|
||||||
|
|
||||||
|
### Credential Types
|
||||||
|
|
||||||
|
| Credential | Purpose | Publish Permissions | Subscribe Permissions |
|
||||||
|
|------------|---------|---------------------|----------------------|
|
||||||
|
| listener | Host listener service | `deploy.responses.>` | `deploy.*.>` |
|
||||||
|
| mcp-deployer | MCP test-tier access | `deploy.test.>` | `deploy.responses.>`, `deploy.discover` |
|
||||||
|
| admin-deployer | Full deployment access | `deploy.test.>`, `deploy.prod.>` | `deploy.responses.>`, `deploy.discover` |
|
||||||
|
|
||||||
|
## Flake Structure
|
||||||
|
|
||||||
|
The flake.nix should provide:
|
||||||
|
|
||||||
|
1. **Package**: The Go binary
|
||||||
|
2. **NixOS module**: The listener service configuration
|
||||||
|
3. **Development shell**: Go toolchain for development
|
||||||
|
|
||||||
|
```nix
|
||||||
|
{
|
||||||
|
inputs = {
|
||||||
|
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
|
||||||
|
};
|
||||||
|
|
||||||
|
outputs = { self, nixpkgs }: {
|
||||||
|
packages.x86_64-linux.default = /* Go package build */;
|
||||||
|
packages.x86_64-linux.homelab-deploy = self.packages.x86_64-linux.default;
|
||||||
|
|
||||||
|
nixosModules.default = import ./nixos/module.nix;
|
||||||
|
nixosModules.homelab-deploy = self.nixosModules.default;
|
||||||
|
|
||||||
|
devShells.x86_64-linux.default = /* Go dev shell */;
|
||||||
|
};
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
## Implementation Notes
|
||||||
|
|
||||||
|
### Go Dependencies
|
||||||
|
|
||||||
|
Recommended libraries:
|
||||||
|
- `github.com/nats-io/nats.go` - NATS client
|
||||||
|
- `github.com/spf13/cobra` - CLI framework
|
||||||
|
- `github.com/mark3labs/mcp-go` - MCP server implementation (or similar)
|
||||||
|
- Standard library for JSON, logging, process execution
|
||||||
|
|
||||||
|
### Error Handling
|
||||||
|
|
||||||
|
- NATS connection errors: Retry with exponential backoff
|
||||||
|
- nixos-rebuild failures: Capture stdout/stderr, report in response message
|
||||||
|
- Timeout: Kill the nixos-rebuild process, report timeout error
|
||||||
|
|
||||||
|
### Testing
|
||||||
|
|
||||||
|
- Unit tests for message parsing and validation
|
||||||
|
- Integration tests using a local NATS server
|
||||||
|
- End-to-end tests with a NixOS VM (optional, can be done in consuming repo)
|
||||||
|
|
||||||
|
## Security Considerations
|
||||||
|
|
||||||
|
- **Privilege**: Listener runs as root to execute nixos-rebuild
|
||||||
|
- **Input validation**: Strictly validate revision format (alphanumeric, dashes, underscores, dots, slashes for branch names; hex for commit hashes)
|
||||||
|
- **Command injection**: Never interpolate user input into shell commands without validation
|
||||||
|
- **Rate limiting**: Consider adding rate limiting to prevent rapid-fire deployments
|
||||||
|
- **Audit logging**: Log all deployment requests with full context
|
||||||
|
- **Network isolation**: NATS should only be accessible from trusted networks
|
||||||
|
|
||||||
|
## Future Enhancements
|
||||||
|
|
||||||
|
These are not required for initial implementation:
|
||||||
|
|
||||||
|
1. **Deployment locking** - Cluster-wide lock to prevent fleet-wide concurrent deploys
|
||||||
|
2. **Prometheus metrics** - Export deployment count, duration, success/failure rates
|
||||||
|
3. **Webhook triggers** - HTTP endpoint for CI/CD integration
|
||||||
|
4. **Scheduled deployments** - Deploy at specific times (though this overlaps with existing auto-upgrade)
|
||||||
15
flake.nix
Normal file
15
flake.nix
Normal file
@@ -0,0 +1,15 @@
|
|||||||
|
{
|
||||||
|
description = "A very basic flake";
|
||||||
|
|
||||||
|
inputs = {
|
||||||
|
nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
|
||||||
|
};
|
||||||
|
|
||||||
|
outputs = { self, nixpkgs }: {
|
||||||
|
|
||||||
|
packages.x86_64-linux.hello = nixpkgs.legacyPackages.x86_64-linux.hello;
|
||||||
|
|
||||||
|
packages.x86_64-linux.default = self.packages.x86_64-linux.hello;
|
||||||
|
|
||||||
|
};
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user