left4me/deploy/README.md

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# left4me Deployment
This directory contains the production-like test deployment for a Linux server. It installs the repository into a fixed host layout, configures a dedicated runtime user, installs systemd units, and wires the web app to host operations through privileged helper commands.
## Target Layout
The deployment uses these paths:
- `/etc/left4me/host.env`: host library environment configuration.
- `/etc/left4me/web.env`: web app environment configuration.
- `/opt/left4me/.venv`: Python virtual environment for deployed commands.
- `/opt/left4me`: deployed repository contents.
- `/var/lib/left4me/left4me.db`: SQLite database used by the web app.
- `/var/lib/left4me/installation`: shared L4D2 installation.
- `/var/lib/left4me/overlays`: externally managed overlay directories.
- `/var/lib/left4me/instances`: rendered instance specifications and per-instance state.
- `/var/lib/left4me/runtime`: per-instance runtime mount directories.
- `/var/lib/left4me/tmp`: temporary files used by deployment/runtime operations.
- `/usr/local/lib/systemd/system`: global systemd unit files, including `left4me-server@.service`.
- `/usr/local/libexec/left4me`: privileged helper commands, including `left4me-systemctl` and `left4me-journalctl`.
- `/etc/sudoers.d/left4me`: sudoers rules allowing the web/runtime commands to call the helpers non-interactively.
Static units are generated for `/var/lib/left4me`. If `LEFT4ME_ROOT` changes, regenerate and reinstall the unit files instead of reusing the existing static units.
## Runtime User
The deployment creates and runs host operations as the dedicated runtime user:
- Username: `left4me`
- Home: `/var/lib/left4me`
- Shell: `/usr/sbin/nologin`
## Running A Test Deployment
Run the deployment from the repository root:
```bash
deploy/deploy-test-server.sh deploy-user@example-host
```
The SSH user must be able to run `sudo` on the target host. The deployment configures system packages, directories, environment files, helper scripts, sudoers rules, Python dependencies, and systemd units.
## Admin Bootstrap
Set the bootstrap credentials in the environment when creating the first admin user:
```bash
LEFT4ME_ADMIN_USERNAME=admin \
LEFT4ME_ADMIN_PASSWORD='change-me' \
flask create-user "$LEFT4ME_ADMIN_USERNAME" --admin
```
Use a strong one-time password and rotate it after first login if needed.
## Overlay References
Overlay references are relative paths below `${LEFT4ME_ROOT}/overlays`. With the default deployment root, they resolve under `/var/lib/left4me/overlays`.
Valid examples:
- `standard`
- `competitive/base`
- `users/42/custom`
Invalid references are rejected:
- Absolute paths such as `/srv/overlay`.
- Parent traversal such as `../other` or `competitive/../../base`.
- Empty path components such as `competitive//base`.
- Symlink escapes that resolve outside `${LEFT4ME_ROOT}/overlays`.
Overlay content is external to the host library and deployment contract. Populate overlay directories separately before referencing them from blueprints or instance specs.