Add QEMU Guest Agent checksum verification with SHA256#413
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* Add new [virtio_qemu_guest_agent] configuration section with url and checksum options * Implement SHA256 checksum verification in Download-QemuGuestAgent function * Update documentation with QEMU Guest Agent configuration examples and checksum usage * Maintain full backward compatibility with existing configurations
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Jun 5, 2026
Add a [virtio_qemu_guest_agent] config section with two optional options:
* url: overrides the default QEMU guest agent MSI installer URL selected
by install_qemu_ga (which must be set to True).
* checksum: SHA256 hash of the installer. When set, the downloaded MSI is
verified with Get-FileHash and the image build fails on mismatch. It
applies to the installer selected by either url or the default URL.
Download-QemuGuestAgent gains optional -CustomUrl and -Checksum parameters
and warns when a custom URL is used without a checksum. The default behaviour
(install_qemu_ga True/False/custom-URL string) is unchanged, so this is fully
backward compatible. Documented in the example config and README.
Relates-to: cloudbase#413
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jun 5, 2026
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This PR adds SHA256 checksum verification for QEMU Guest Agent installation, enhancing security while maintaining full backward compatibility.
New Features
[virtio_qemu_guest_agent]configuration section withurlandchecksumparametersDownload-QemuGuestAgentfunctionConfiguration Example
Benefits
Security: Verifies downloaded file integrity
Control: Know exactly which version will be installed
Protection: Prevents man-in-the-middle attacks
Compliance: Facilitates security audits
Backward Compatibility
All existing configurations continue to work without modification:
Files Modified
Config.psm1
WinImageBuilder.psm1
Examples/windows-image-config-example.ini
README.md