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intricko merged 1 commit into from
Sep 8, 2026
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docs: document nohup long-run pattern for dts #52

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19 changes: 19 additions & 0 deletions .devcontainer/skills/docker-test-shell/references/dts-usage.md
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Expand Up @@ -51,6 +51,25 @@ These were verified empirically in a real `ubuntu:24.04` container:
| apt prereqs | manual one-off via `dts apt`, not bundled |
| Verification | plain shell (exit code, grep, curl) |

## Long-running installs/boots: run detached (`nohup`) so they don't get SIGTERM'd

A multi-minute `install.sh`/`boot.sh` run as a plain foreground `dts exec` can be killed (exit 143 / "Terminated") when the driving exec session ends, and `pkill -f install.sh` on the host matches your own exec command line (it contains "install.sh") and kills your own pipeline.

**Detach the long part** and write to a log, then poll with short separate `dts exec` calls:

```bash
dts exec 'nohup bash -c "bash /src/install.sh > /home/ubuntu/install.log 2>&1; \
echo INSTALL_EXIT=$? >> /home/ubuntu/install.log; \
bash -l /home/ubuntu/.minions/boot.sh >> /home/ubuntu/boot.log 2>&1; \
echo BOOT_EXIT=$? >> /home/ubuntu/boot.log" >/dev/null 2>&1 & echo launched'

sleep 120
dts exec 'grep -E "installed and verified|INSTALL_EXIT|Terminated|Killed" /home/ubuntu/install.log | tail -5'
dts exec 'tail -5 /home/ubuntu/boot.log; grep BOOT_EXIT /home/ubuntu/boot.log'
```

Rules: wrap in `nohup bash -c '...' &`, log to a file not stdout, kill by exact PID never `pkill -f '<scriptname>'`.

## Root vs uid-1000: when to use which

| Operation | Command | User | Note |
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