feat(bls): boot unified kernel images (Type #2 entries) - #111
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Scan the EFI/Linux directory, or the new uki-path option of the BLS generator, for .efi files and turn each one into an entry using the metadata in its PE sections. Autoconfigure now also detects a disk that only has unified kernel images. An image with the id of a type 1 entry is skipped, and boot counting works on the .efi file name.
…ype 1 scan fails Check file name suffixes without slicing by byte offset, drop the PE section bytes once an image has been parsed, and only fail the generator on a type 1 error when unified kernel images are disabled.
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Adds BLS Type #2 support. The BLS generator now scans
\EFI\Linux(or the newuki-pathoption, where an empty value turns it off) for.efifiles and makes an entry from each unified kernel image, using the title and version from its.osrelsection. Only the PE headers and the.osrel,.cmdlineand.unamesections are read, so large images are never loaded. Images without.osrel, or built for another architecture, are skipped, and a unified kernel image with the same id as a Type #1 entry is ignored. Autoconfigure also detects a disk that only has unified kernel images.Boot counting works on
.efifile names too. The counter rename is now done in place instead of copying the file, which matters for 100 MB images and also makes the.confrename atomic.Scanning is on by default, so existing BLS setups will list any images in
\EFI\Linux. Two generators that read the same directory would list every image twice, so only one should scan it. Whenuki-pathisn't set it follows the device ofpath. I tested with QEMU/OVMF using synthetic images, not real signed unified kernel images, and not on aarch64 at runtime or with Secure Boot.