svci 1.2.0

A tool to install Python as SystemD or LaunchD service

svci

A tool to install Python apps as systemd (Linux) or launchd (macOS) services.

Features

• Cross-platform: systemd on Linux, launchd on macOS
• Three service modes: user, system, and system-at-user
• ConfigArgParse-based CLI with CLI args, environment variables, and TOML config file support
• --pyproject flag to read config from [tool.svci] in pyproject.toml
• Built-in templates with customizable overrides
• Dry-run by default, --install to write to disk
• DIY mode (--diy) generates a deployment bundle with service file + README
• Pre-flight checks: .venv detection, linger status (Linux), existing service detection
• Colored unified diff before overwriting existing services
• D-Bus integration for systemd control (via jeepney)
• Modern launchctl commands (bootstrap/bootout/kickstart) for macOS

Requirements

• Python 3.10 or newer
• Linux (systemd) or macOS (launchd)

Installation

pip install svci

Or with uv:

uv tool install svci

Usage

Dry run (preview the generated service file)

svci \
  --working-dir /path/to/app \
  --run-cmd "uv run app --host 127.0.0.1 --port 7867"

Install a user service

svci \
  --install \
  --enable \
  --start \
  --working-dir /path/to/app \
  --run-cmd "uv run app --host 127.0.0.1 --port 7867"

Install a system-wide service

sudo svci \
  --install \
  --service-mode system \
  --name my-app \
  --working-dir /srv/my-app \
  --run-cmd "uv run app --host 127.0.0.1 --port 7867"

Install a system-wide name@user service

sudo svci \
  --install \
  --service-mode system-at-user \
  --name my-app \
  --user myuser \
  --working-dir /srv/my-app \
  --run-cmd "uv run app --host 127.0.0.1 --port 7867"

Show platform-specific management commands

svci --help-platform --name my-app --service-mode user

This prints all the commands you need to manage the service (enable, start, stop, restart, logs, remove), tailored to your platform (systemd or launchd) and service mode. Works standalone or after install/dry-run.

Generate a DIY deployment bundle

svci \
  --diy \
  --working-dir /path/to/app \
  --run-cmd "uv run app --host 127.0.0.1 --port 7867"

This creates a ~/tmp/<name>/ directory with the service file and a README with manual deployment instructions.

Using pyproject.toml

Add a [tool.svci] section to your project's pyproject.toml:

[tool.svci]
name = "my-web-app"
description = "FastAPI app running via uv"
run_cmd = "uv run main.py --host 127.0.0.1 --port 8000"
service_mode = "user"

[tool.svci.environment]
DEBUG = "false"
PORT = "8000"
DATABASE_URL = "postgresql://localhost/mydb"

[tool.svci.systemd]
restart = "always"
restart_sec = 3

[tool.svci.launchd]
run_at_load = true

Then deploy with a single command from your project directory:

svci --pyproject --install --enable --start

Or point to a specific file:

svci --pyproject /path/to/pyproject.toml --install

When --pyproject is used, working_dir defaults to the directory containing the pyproject.toml. CLI arguments always override values from pyproject.toml.

[tool.svci] reference

Key	Type	Description
name	string	Service name (default: directory name)
description	string	Service description
run_cmd	string	Command to execute
working_dir	string	Working directory (default: pyproject.toml directory)
service_mode	string	"user", "system", or "system-at-user"
user	string	User for system modes
group	string	Group for system modes (Linux only)
template	string	Path to custom template file

Section	Key	Type	Description
[tool.svci.environment]	any	string	Environment variables set in the service
[tool.svci.systemd]	restart	string	Restart policy (default: "on-failure")
[tool.svci.systemd]	restart_sec	integer	Seconds between restarts (default: 5)
[tool.svci.launchd]	run_at_load	boolean	Start at login/boot (default: true)

Configuration

svci looks for config files in:

• ~/.config/svci/config.toml

Custom templates can be placed at:

• ~/.config/svci/templates/systemd.service-template
• ~/.config/svci/templates/launchd.plist-template

All CLI options can also be set via environment variables with the SVCI_ prefix (e.g., SVCI_WORKING_DIR, SVCI_RUN_CMD).

Priority order

CLI args > environment variables (SVCI_*) > --pyproject ([tool.svci]) > config file (~/.config/svci/config.toml) > defaults

Service modes

Mode	Linux	macOS
user	systemd user unit (~/.config/systemd/user/)	LaunchAgent (~/Library/LaunchAgents/)
system	systemd system unit (/etc/systemd/system/)	LaunchDaemon (/Library/LaunchDaemons/)
system-at-user	name@.service template	LaunchDaemon with UserName

License

MIT