Path: /preinstall_components/pre_checks.py
This script performs a series of pre-installation checks to ensure the system is ready for Talon installation, including disabling Windows Defender, verifying Windows edition, testing network connectivity, checking filesystem write permissions, and running a PowerShell test script.
Validate that the host system meets all prerequisites before installing Talon.
Provide clear, user-friendly error messages and guidance when a check fails, allowing continuation or troubleshooting.
utilities.util_defender_check
utilities.util_windows_check
| Parameter | Type | Description | Default |
|---|---|---|---|
| TEST_SCRIPT_URL | string | URL used to download the dry-run PowerShell test script | https://code.ravendevteam.org/talon/dry_run_test.ps1 |
python pre_checks.pyWhen executed, pre_checks.py sequentially:
1. Calls ensure_defender_disabled() to disable Windows Defender if running.
2. Runs check_windows_11_home_or_pro() to confirm a supported Windows edition.
3. Executes a HEAD request to the Raven Dev Team code server to verify network reachability.
4. Attempts to create and write to a talon directory under the system TEMP path to ensure write permissions.
5. Downloads a PowerShell script via download_file() and runs it, checking for a “Hello, World!” response.
Side effects include creating temporary directories/files, showing error popups, and logging outputs.
Each check catches exceptions, logs an error via logger.error(), and displays an error popup with show_error_popup(), allowing the user to continue or address the issue manually.
The script downloads and runs a PowerShell script with -ExecutionPolicy Bypass, so ensure TEST_SCRIPT_URL points to a trusted source. All HTTPS requests use a custom SSL context to validate certificates. Disabling Windows Defender requires administrative privileges.
Uses utilities.util_logger.logger at ERROR level for failures and DEBUG level for verbose outputs such as the PowerShell script’s stdout (e.g., “Test script output: …”).
Run pre_checks.py on a test machine; simulate failures by disabling network access, removing TEMP directory write permissions, or blocking PowerShell execution. Verify error popups appear and logs are recorded.
Author: Raven Development Team