# ATVM Watcher Service

This folder contains a per-run ATVM watcher service package that is intended to be reviewed locally first and installed on the ATVM Cypress controller later only when explicitly requested.

## Purpose

Watch a single ATVM automation run until it reaches a terminal state, then:

- post the final status to Mattermost if the run state is `COMPLETED` or `FAILED`
- verify the Mattermost post succeeded
- write durable watcher state
- exit cleanly so the service stops

The watcher does not run indefinitely. It is designed for one run per service instance.

## Files

- `atvm_run_watcher.py`
  - main watcher implementation
- `atvm-run-watcher@.service`
  - `systemd` template unit for one watcher instance per build name
- `start-atvm-run-watcher.sh`
  - helper to write per-run environment data and start a watcher instance
- `cancel-atvm-run-watcher.sh`
  - helper to mark a run cancelled and stop the watcher instance

## Intended Controller Paths

These are the default install targets assumed by the included unit file:

- service package root: `/opt/atvm-watcher-service`
- watcher state root: `/var/lib/atvm-run-watcher`
- controller ATVM automation root: `/root/cdc-e2e-cyp-12.17.4`
- watcher environment file: `/etc/atvm-run-watcher.env`

Use `/opt/atvm-watcher-service` as the controller install root for future installs and reinstalls.
Do not treat `/root/atvm-watcher-service` as the preferred long-term install location.

## Per-Run Behavior

Each watcher instance is tied to one build name.

Typical workflow:

1. Launch the ATVM run.
2. Start the watcher for that run.
3. The watcher polls the run log, process state, and `cmcReporter` artifacts.
4. When the run reaches a terminal state:
   - `COMPLETED` or `FAILED`
     - build the final ATVM status
     - send the status to Mattermost
     - verify Mattermost returned `ok`
     - mark the run as posted
     - exit
   - `CANCELLED`, `TERMINATED`, `HUNG`, or `UNKNOWN`
     - do not post
     - mark the final state
     - exit

## Required Environment

The service expects the local credentials file values to be made available on the controller through the service environment:

- `MATTERMOST_ATVM_WEBHOOK`
- `MATTERMOST_ATVM_CHANNEL`

Optional metadata for better status formatting:

- `ATVM_WATCHER_TEMPLATE`
- `ATVM_WATCHER_CONFIG_FAMILY`
- `ATVM_WATCHER_MIGRATION_STYLE`
- `ATVM_WATCHER_INTEGRATION_PLUGIN`
- `ATVM_WATCHER_SCOPE_DESCRIPTION`

## Start Example

This helper writes a per-run environment file and starts the matching instance:

```bash
./start-atvm-run-watcher.sh \
  --build-name e2e-redhat9.6-ubuntu24.04-w2k25-fc \
  --template cmc-e2e \
  --config-family gold \
  --migration-style "ATVM end-to-end migration validation" \
  --integration-plugin "pure with fc" \
  --scope-description "mixed Linux and Windows FC E2E validation on the gold datastore set"
```

That results in:

- state dir:
  - `/var/lib/atvm-run-watcher/e2e-redhat9.6-ubuntu24.04-w2k25-fc`
- service instance:
  - `atvm-run-watcher@e2e-redhat9.6-ubuntu24.04-w2k25-fc.service`

## Cancel Example

```bash
./cancel-atvm-run-watcher.sh --build-name e2e-redhat9.6-ubuntu24.04-w2k25-fc
```

This writes a cancellation marker and stops the watcher instance. The watcher will not send Mattermost results for that run.

## Notes

- The watcher uses the same ATVM status layout documented in `atvm/docs/automation/status-template.md`.
- Kernel values are resolved from `atvm/inventory/vm-inventory.md`.
- Best-practice controller install path: `/opt/atvm-watcher-service`.
- This package is local-only right now. Nothing here is installed on the controller yet.