100 lines
3.4 KiB
Markdown
100 lines
3.4 KiB
Markdown
# setup-auto-updates.sh
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A cross-compatible shell script for enabling unattended automatic updates on Debian and Ubuntu systems.
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Designed for clean, predictable configuration using modern `Origins-Pattern` syntax.
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Includes dry-run validation and systemd timer setup when supported.
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---
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**Version:** 2025-07-28
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**License:** MIT
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---
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## Features
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- Detects Debian or Ubuntu and applies best-practice configuration
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- Configures `unattended-upgrades` to install regular and security updates automatically
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- Clears legacy `Allowed-Origins` and uses clean `Origins-Pattern` format
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- Supports both traditional and deb822-style APT sources
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- Enables systemd timers (`apt-daily.timer` and `apt-daily-upgrade.timer`) when available
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- Configures daily update checks, weekly autoclean, and auto-reboot at 4:00 AM if needed
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- Includes a dry-run validation with basic error detection
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- Prompts to delete the script after successful execution
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## Compatibility
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- **Debian**: Bookworm, Trixie, and newer
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- **Ubuntu**: Noble (24.04 LTS) and newer
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- Should be safe on any modern system with `unattended-upgrades` and `apt`
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## What It Does
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- Installs `unattended-upgrades` if missing
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- Writes a new `/etc/apt/apt.conf.d/50unattended-upgrades` using a robust and portable structure
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- Enables APT periodic updates via `/etc/apt/apt.conf.d/20auto-upgrades`
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- Enables systemd timers if `systemctl` is available
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- Does **not** run any updates itself or reboot your system directly
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## Example Output
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```
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[INFO] Unattended-upgrades configurator (Debian/Ubuntu)
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[INFO] Detected OS: Debian GNU/Linux 12 (bookworm)
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[INFO] Updating APT cache…
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[INFO] Installing unattended-upgrades…
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[INFO] Validating unattended-upgrades with a dry run…
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Allowed origins are: origin=Debian,archive=bookworm, origin=Debian,archive=bookworm-updates, ...
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[INFO] Timers:
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Mon 2025-07-28 06:40:14 MDT ... apt-daily-upgrade.timer
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Mon 2025-07-28 10:51:12 MDT ... apt-daily.timer
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[OK] Unattended updates configured. Regular + security updates will apply automatically; reboot at 04:00 if needed.
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```
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## Usage
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```bash
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sudo ./setup-auto-updates.sh
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```
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- Must be run as root
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- Prompts to delete itself after successful configuration if run interactively
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## Customization
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To change the default reboot time:
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```bash
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sudo REBOOT_TIME="03:30" ./setup-auto-updates.sh
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```
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To run without dry-run validation (not recommended), you can comment out or modify the `validate_with_dryrun()` function.
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## Notes
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- If APT is locked by another process, the script waits up to 3 minutes before proceeding
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- Dry-run validation logs are saved to `/tmp/unattended-upgrades-dryrun.*`
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- The script confirms presence of `systemctl` before enabling timers
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- Automatically overwrites existing configuration files with no backup:
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- `/etc/apt/apt.conf.d/50unattended-upgrades`
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- `/etc/apt/apt.conf.d/20auto-upgrades`
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## Self-Delete Behavior
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At the end of the script, a prompt asks if you'd like to remove the `.sh` file that was just executed.
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This helps keep systems tidy after one-time provisioning.
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## Limitations
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- Does not configure granular package exclusions or holds
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- Will not trigger updates or reboots itself; configuration only
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- Does not install `powermgmt-base`, so power-check warnings may appear on laptops
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- Not compatible with non-Debian distributions (e.g., Fedora, Arch)
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## License
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MIT License – use freely, modify as needed, no warranties.
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---
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Created and maintained by a privacy-conscious, security-oriented Linux sysadmin. |