Update readme.md

readme.md

@@ -36,9 +36,21 @@ Includes dry-run validation and systemd timer setup when supported.
 - 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…
@@ -62,34 +74,32 @@ sudo ./setup-auto-updates.sh
 
 ## Customization
 
-To change the default reboot time:
-
+- **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.
 
-To run without dry-run validation (not recommended), you can comment out or modify the `validate_with_dryrun()` function.
+## Systemd Timers Enabled
 
-## Notes
-
-- If APT is locked by another process, the script waits up to 3 minutes before proceeding
-- Dry-run validation logs are saved to `/tmp/unattended-upgrades-dryrun.*`
-- The script confirms presence of `systemctl` before enabling timers
-- Automatically overwrites existing configuration files with no backup:
-  - `/etc/apt/apt.conf.d/50unattended-upgrades`
-  - `/etc/apt/apt.conf.d/20auto-upgrades`
+- `apt-daily.timer` – Regular APT metadata refresh  
+- `apt-daily-upgrade.timer` – Executes `unattended-upgrades` daily  
 
 ## Self-Delete Behavior
 
-At the end of the script, a prompt asks if you'd like to remove the `.sh` file that was just executed.  
-This helps keep systems tidy after one-time provisioning.
+At the end of the script, you’ll be asked:
+
+> Script successful. Do you wish to delete this script?
+
+This helps keep your directory tidy after one-time provisioning.
 
 ## Limitations
 
-- Does not configure granular package exclusions or holds
-- Will not trigger updates or reboots itself; configuration only
-- Does not install `powermgmt-base`, so power-check warnings may appear on laptops
-- Not compatible with non-Debian distributions (e.g., Fedora, Arch)
+- 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)
 
 ## License