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README.md

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+# RHEL 8.10 Offline Update Script
+
+An interactive bash script for applying RHEL 8.10 updates from a local ISO file in air-gapped or disconnected environments.
+
+## Overview
+
+This script guides administrators through the process of mounting an update ISO and applying patches to RHEL 8.10 systems that cannot reach Red Hat's CDN or Satellite servers.
+
+## Requirements
+
+- RHEL 8.10 system
+- Root or sudo access
+- Update ISO: `Full_Latest_RHEL8_x86_64_patches_2026-01-13.iso`
+- ~35 GB free disk space (if copying ISO locally)
+
+## Quick Start
+
+```bash
+# Download the script
+chmod +x rhel8-iso-update.sh
+
+# Run with sudo
+sudo ./rhel8-iso-update.sh
+```
+
+## Features
+
+- **Interactive prompts** - Confirms each action before proceeding
+- **External media detection** - Automatically finds the ISO on USB drives
+- **Unmounted USB support** - Detects and offers to mount USB devices
+- **Progress feedback** - Color-coded output for easy reading
+- **Reboot detection** - Checks if a reboot is needed after updates
+- **Cleanup options** - Offers to remove configs and unmount when finished
+
+## What the Script Does
+
+| Step | Action |
+|------|--------|
+| 1 | Locates the ISO file (local storage or external media) |
+| 2 | Creates mount point at `/media/JanPatch` |
+| 3 | Mounts the ISO |
+| 4 | Creates repo file at `/etc/yum.repos.d/JanPatch.repo` |
+| 5 | Refreshes DNF cache |
+| 6 | Displays available updates |
+| 7 | Applies updates |
+| 8 | Checks if reboot is required |
+| 9 | Cleanup (optional) |
+
+## Usage Examples
+
+### ISO Already Copied to Server
+
+If the ISO is already at `/var/isos/Full_Latest_RHEL8_x86_64_patches_2026-01-13.iso`:
+
+```bash
+sudo ./rhel8-iso-update.sh
+```
+
+The script will detect it and proceed.
+
+### ISO on USB Drive
+
+1. Plug in the USB drive containing the ISO
+2. Run the script:
+
+```bash
+sudo ./rhel8-iso-update.sh
+```
+
+3. The script will detect the USB and offer options:
+   - Copy ISO to local storage (recommended for faster updates)
+   - Use ISO directly from USB (no wait, but slower updates)
+
+### Manual ISO Path
+
+If your ISO is in a non-standard location, the script will prompt you to enter the path manually.
+
+## Configuration
+
+Default paths used by the script:
+
+| Setting | Value |
+|---------|-------|
+| ISO filename | `Full_Latest_RHEL8_x86_64_patches_2026-01-13.iso` |
+| Default ISO path | `/var/isos/` |
+| Mount point | `/media/JanPatch` |
+| Repo file | `/etc/yum.repos.d/JanPatch.repo` |
+| Repo name | `dvd-rhel-patches` |
+
+To change these defaults, edit the Configuration section at the top of the script.
+
+## Repository Configuration
+
+The script creates the following repo file:
+
+```ini
+[dvd-rhel-patches]
+name=DVD for RHEL Patches
+baseurl=file:///media/JanPatch
+enabled=1
+gpgcheck=0
+```
+
+GPG checking is disabled to avoid signature issues in disconnected environments.
+
+## Cleanup
+
+At the end of the process, the script offers to:
+
+- Disable the `dvd-rhel-patches` repository
+- Remove the repo file
+- Unmount the ISO
+- Unmount USB drives (if used)
+- Delete the ISO file to free up space
+
+All cleanup actions require confirmation.
+
+## Troubleshooting
+
+### Script won't run
+
+```bash
+# Make sure it's executable
+chmod +x rhel8-iso-update.sh
+
+# Run with sudo
+sudo ./rhel8-iso-update.sh
+```
+
+### ISO not detected on USB
+
+- Ensure the USB drive is plugged in before running the script
+- Try running `lsblk` to verify the system sees the drive
+- The script searches up to 3 directories deep on external media
+
+### "No repodata found" error
+
+The ISO structure may differ from expected. Check the ISO contents:
+
+```bash
+sudo mount -o loop /path/to/iso /mnt/temp
+ls -la /mnt/temp
+find /mnt/temp -name "repodata" -type d
+```
+
+Update the `baseurl` in `/etc/yum.repos.d/JanPatch.repo` to point to the directory containing `repodata/`.
+
+### Updates failing with dependency errors
+
+Try disabling other repos and using only the ISO:
+
+```bash
+sudo dnf update --disablerepo="*" --enablerepo="dvd-rhel-patches"
+```
+
+## Manual Process
+
+If you prefer to run the steps manually, see the accompanying guide: [RHEL 8.10 Offline Update Guide](rhel8-iso-update-guide.md)
+
+## Files
+
+| File | Description |
+|------|-------------|
+| `rhel8-iso-update.sh` | Interactive update script |
+| `rhel8-iso-update-guide.md` | Manual step-by-step guide |
+| `README.md` | This file |
+
+## Author
+
+Cybersecurity Team
+
+## Last Updated
+
+January 2026