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Add per-camera capture watchdog with stall and recovery notifications

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capture-watchdog.sh: long-running script that checks the newest JPEG mtime
in each camera's output directory every CAPTURE_STALE_SECS/3 seconds (min 5s).
Sends a stall notification via notify.sh if no new frame has arrived within
CAPTURE_STALE_SECS. Sends a recovery notification once new frames resume.
Only alerts if the camera was previously working (avoids false positives on
first start or overnight before the first frame of the day).

sky-cam.conf: CAPTURE_STALE_SECS=30 added next to CAPTURE_INTERVAL with a
note that it should be at least 2x the interval.

install.sh: generates sky-cam-watchdog-<cam>.service for every camera that
has a RTSP URL configured. The watchdog service starts after and alongside
the capture service, restarts on failure, and is enabled/started with the
same loop as the capture service.

README.md: note about watchdog and journalctl command for its logs.

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ
This commit is contained in:
Claude
2026-04-20 01:13:49 +00:00
parent 8b9ad74c58
commit 3265ed80fd
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README.md
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@@ -242,6 +242,11 @@ systemctl --user status sky-cam-capture-east.service
journalctl --user -u sky-cam-capture-east.service -f
```
The capture watchdog runs alongside each camera and sends a notification (via `notify.sh`) if no new frame arrives within `CAPTURE_STALE_SECS` seconds, and a second notification when capture resumes. Check watchdog logs with:
```bash
journalctl --user -u sky-cam-watchdog-east.service -f
```
**Check logs**:
```bash
journalctl --user -u sky-cam-sunrise.service