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 # setup-auto-updates.sh
 
-A cross-compatible shell script for enabling unattended automatic updates on Debian and Ubuntu systems.  
-Designed for clean, predictable configuration using modern `Origins-Pattern` syntax.  
-Includes dry-run validation and systemd timer setup when supported.
+**Universal unattended-upgrades configurator for Debian and Ubuntu systems**
 
----
-
-**Version:** 2025-07-28  
-**License:** MIT
-
----
+This script configures automatic system updates using `unattended-upgrades`, offering full control over update scope, reboot behavior, and compatibility with both classic and deb822-style APT sources.
 
 ## Features
 
-- Detects Debian or Ubuntu and applies best-practice configuration
-- Configures `unattended-upgrades` to install regular and security updates automatically
-- Clears legacy `Allowed-Origins` and uses clean `Origins-Pattern` format
-- Supports both traditional and deb822-style APT sources
-- Enables systemd timers (`apt-daily.timer` and `apt-daily-upgrade.timer`) when available
-- Configures daily update checks, weekly autoclean, and auto-reboot at 4:00 AM if needed
-- Includes a dry-run validation with basic error detection
-- Prompts to delete the script after successful execution
-
-## Compatibility
-
-- **Debian**: Bookworm, Trixie, and newer
-- **Ubuntu**: Noble (24.04 LTS) and newer
-- Should be safe on any modern system with `unattended-upgrades` and `apt`
-
-## What It Does
-
-- Installs `unattended-upgrades` if missing
-- Writes a new `/etc/apt/apt.conf.d/50unattended-upgrades` using a robust and portable structure
-- Enables APT periodic updates via `/etc/apt/apt.conf.d/20auto-upgrades`
-- Enables systemd timers if `systemctl` is available
-- Does **not** run any updates itself or reboot your system directly
-
-## Kernel Update Policy
-
-By default, this script **permits installation of updated kernels** if they match the configured origins (e.g., `-updates`, `-security`).  
-If you prefer to exclude kernel packages from automatic updates, add the following to `/etc/apt/apt.conf.d/50unattended-upgrades`:
-
-```conf
-Unattended-Upgrade::Package-Blacklist {
-    "linux-image";
-    "linux-headers";
-};
-```
-
-## Example Output
-
-```sh
-[INFO] Unattended-upgrades configurator (Debian/Ubuntu)
-[INFO] Detected OS: Debian GNU/Linux 12 (bookworm)
-[INFO] Updating APT cache…
-[INFO] Installing unattended-upgrades…
-[INFO] Validating unattended-upgrades with a dry run…
-Allowed origins are: origin=Debian,archive=bookworm, origin=Debian,archive=bookworm-updates, ...
-[INFO] Timers:
-Mon 2025-07-28 06:40:14 MDT ... apt-daily-upgrade.timer
-Mon 2025-07-28 10:51:12 MDT ... apt-daily.timer
-[OK] Unattended updates configured. Regular + security updates will apply automatically; reboot at 04:00 if needed.
-```
+- ✅ **Supports Debian (Bookworm/Trixie+) and Ubuntu (Noble+)**
+- ✅ **Interactive prompt to choose:**
+  - Full updates (standard + security + updates)
+  - Security-only updates
+- ✅ **Safe for systems using deb822 sources**
+- ✅ **Smart reboot behavior** (`04:00` by default)
+- ✅ **Clears fragile legacy config entries**
+- ✅ **Systemd timer activation**
+- ✅ **Dry-run validation to verify settings**
+- ✅ **Re-run safe** — overwrites 50unattended-upgrades and 20auto-upgrades
 
 ## Usage
 
+Download and run:
+
 ```bash
+wget https://example.com/setup-auto-updates.sh
+chmod +x setup-auto-updates.sh
 sudo ./setup-auto-updates.sh
 ```
 
-- Must be run as root
-- Prompts to delete itself after successful configuration if run interactively
+You will be prompted:
 
-## Customization
+```
+Configure automatic updates for:
+  [1] Full updates (recommended)
+  [2] Security updates only
+Select [1/2]:
+```
 
-- **Reboot Time:**  
-  ```bash
-  sudo REBOOT_TIME="03:30" ./setup-auto-updates.sh
-  ```
-- **Exclude Third-Party Updates:**  
-  Use `/etc/apt/apt.conf.d/60unattended-thirdparty` to add `site=...` patterns.
+### Non-interactive usage
 
-## Systemd Timers Enabled
+Set the `UPDATE_SCOPE` environment variable before running:
 
-- `apt-daily.timer` – Regular APT metadata refresh  
-- `apt-daily-upgrade.timer` – Executes `unattended-upgrades` daily  
+```bash
+sudo UPDATE_SCOPE=security ./setup-auto-updates.sh
+```
 
-## Self-Delete Behavior
+Valid values: `full` (default) or `security`.
 
-At the end of the script, you’ll be asked:
+### Reboot time
 
-> Script successful. Do you wish to delete this script?
+You may override the default automatic reboot time by setting:
 
-This helps keep your directory tidy after one-time provisioning.
+```bash
+REBOOT_TIME=02:30 ./setup-auto-updates.sh
+```
+
+## What it Does
+
+- Installs and configures `unattended-upgrades`
+- Sets `APT::Periodic` options
+- Writes `/etc/apt/apt.conf.d/50unattended-upgrades` with `Origins-Pattern`
+- Enables systemd timers (if available)
+- Runs a dry-run check to validate behavior
+- Prompts to delete the script after successful configuration
 
 ## Limitations
 
-- Does not configure granular package pinning or holds  
-- Does not auto-install non-origin packages (e.g., third-party repos) unless explicitly configured  
-- Power-check skipped (optional `powermgmt-base` not installed)  
-- Not compatible with non-Debian-based distributions (e.g., Fedora, Arch)
+- This script **does not configure third-party repositories** for auto updates.
+- Kernel packages will be updated if they are included in the chosen update scope (e.g. under `-updates` or `-security`).
 
 ## License
 
-MIT License – use freely, modify as needed, no warranties.
-
----
-
-Created and maintained by a privacy-conscious, security-oriented Linux sysadmin.
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+MIT License
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