distronomicon

A Linux tool that checks GitHub for repository releases and performs atomic updates under /opt/<app>. Designed for use with systemd timers.

Installation

cargo build --release
sudo cp target/release/distronomicon /usr/local/bin/

Usage

All commands require --app <name> to specify the application being managed.

Check for updates

Query GitHub for the latest release without installing:

distronomicon --app myapp check \
  --repo owner/repo \
  --state-directory /var/lib/distronomicon

Prints up-to-date: v1.2.3, update-available: v1.2.3 -> v1.2.4, or install-available: v1.2.4.

Update to latest release

Download, verify, and install the latest release:

distronomicon --app myapp update \
  --repo owner/repo \
  --pattern 'myapp-.*\.tar\.gz' \
  --checksum-pattern 'SHA256SUMS' \
  --state-directory /var/lib/distronomicon \
  --restart-command 'systemctl restart myapp'

This will:

1. Download the matching release asset
2. Verify the checksum
3. Extract to /opt/myapp/releases/<tag>
4. Update symlinks in /opt/myapp/bin
5. Run the restart command (if provided)
6. Prune old releases (keeps 3 by default, configurable with --retain)

Show installed version

distronomicon --app myapp version

Prints the currently installed tag (e.g., v1.2.3), derived from symlinks in the bin directory.

Filesystem Layout

/opt/<app>/
  bin/                    # Symlinks to current release binaries
    myapp -> ../releases/v1.2.3/myapp
  releases/
    v1.2.2/              # Previous release
    v1.2.3/              # Current release
  staging/               # Temporary extraction (cleaned after install)

/var/lib/distronomicon/<app>/state.json   # Tracks latest tag, ETag, Last-Modified

The --install-root flag changes the base from /opt to another location.

GitHub Authentication

For private repositories or higher rate limits, provide a token:

export GITHUB_TOKEN=ghp_...
distronomicon --app myapp update ...

Or use --github-token flag.

Systemd Timer

Example service and timer files are in the systemd/ directory. To set up:

sudo cp systemd/distronomicon@.{service,timer} /etc/systemd/system/
sudo mkdir -p /etc/distronomicon
# Create /etc/distronomicon/myapp.conf with environment variables
sudo systemctl daemon-reload
sudo systemctl enable --now distronomicon@myapp.timer

Check status:

systemctl status distronomicon@myapp.timer
systemctl list-timers distronomicon@*

Options

• --install-root - Change base directory (default: /opt)
• --skip-verification - Skip checksum verification (not recommended)
• --retain N - Keep N old releases after update (default: 3)
• --allow-prerelease - Include prerelease versions
• --github-host - Use GitHub Enterprise (default: api.github.com)
• -v, -vv - Increase logging verbosity

License

MIT