Arch Linux ISO Downloader and Writer

A Bash script to download the latest Arch Linux ISO, verify its integrity, and optionally write it to a USB flash drive. Designed for both macOS and Linux, with robust error handling and debug support.

Features

• Automatic Download: Fetches the latest Arch Linux ISO via torrent using aria2c.
• Integrity Verification: Checks the ISO’s SHA256 checksum and GPG signature.
• USB Writing: Detects removable/external drives and writes the ISO with dd.
• Cross-Platform: Works on macOS and Linux with platform-specific drive detection.
• Debug Mode: Enable detailed logging with DEBUG=true or DEBUG=1.

Requirements

• Core Tools:
  • curl: For downloading torrent and verification files.
  • aria2c: For torrent-based ISO download.
  • sha256sum: For checksum verification.
  • gpg: For signature verification.
  • mktemp: For temporary directory creation.
  • dd: For writing the ISO to a USB drive.
• Optional:
  • tput: For colored terminal output (falls back to plain text if unavailable).
• Platform-Specific:
  • macOS: diskutil (pre-installed).
  • Linux: lsblk (typically pre-installed).

Install missing tools with your package manager (e.g., brew on macOS, pacman on Arch Linux).

Usage

1. Clone the Repository:

   git clone https://github.com/cleanhands/getarch.sh.git
   cd arch-iso-script

2. Make Executable:

   chmod +x getarch.sh

3. Run the Script:
   • Basic run:

     ./getarch.sh

   • With debug output:

     DEBUG=1 ./getarch.sh

4. Follow Prompts:
   • The script downloads and verifies the ISO.
   • If run interactively, it asks to write the ISO to a USB drive, listing detected devices.

Output

• Downloads the ISO to ~/Downloads (or $XDG_DOWNLOAD_DIR if set).
• Caches the ISO in ~/.cache/archlinux (or $XDG_CACHE_HOME/archlinux).
• Optionally writes to a selected USB drive with progress feedback.

Example

$ DEBUG=1 ./getarch.sh
Starting script...
Initializing...
[DEBUG] Starting main function
[DEBUG] Commands checked
[DEBUG] Creating temporary directory
[DEBUG] Changed to temp directory: /tmp/tmp.abc123
[DEBUG] Fetching version from https://archlinux.org/releng/releases/
[DEBUG] Determined version: 2025.03.01
...
Successfully downloaded and verified archlinux-2025.03.01-x86_64.iso

Would you like to write the ISO to a flash drive? (y/N): y
[DEBUG] Detected 1 USB drives

Available USB drives:
1) disk4

Select a drive (1-1, or 0 to skip): 1
...
Successfully wrote ISO to disk4

Notes

• macOS Detection: Detects USB drives based on "Removable Media: Removable" or "Device Location: External" from diskutil.
• Linux Detection: Uses lsblk to find removable block devices.

Contributing

Feel free to open issues or submit pull requests for improvements, especially for edge cases in drive detection or additional features.

License

MIT License - feel free to use, modify, and distribute.