Daan De Meyer
05e1ca3144
When booting from a CD-ROM via El Torito, the UEFI device path contains a CDROM_DEVICE_PATH node instead of a HARDDRIVE_DEVICE_PATH node. Unlike the hard drive variant, the CDROM node does not carry a partition UUID, so systemd-boot previously could not determine the boot partition UUID in this scenario. Add disk_get_part_uuid_cdrom() which recovers the partition UUID by reading the GPT from the underlying disk. Since ISO images are commonly mastered with 512-byte GPT sectors on media with 2048-byte blocks, the function probes for the GPT header at multiple sector sizes (512, 1024, 2048, 4096) and matches the partition by comparing byte offsets between the CDROM node's PartitionStart and each GPT entry's StartingLBA. The function reuses read_gpt_entries() for GPT parsing and adds debug logging for each failure path to aid diagnosis on real hardware. Also adds the CDROM_DEVICE_PATH struct and MEDIA_CDROM_DP subtype constant to device-path.h, and fixes disk_get_part_uuid() to preserve the original device path pointer so it can be passed to the CDROM fallback. Co-developed-by: Claude Opus 4.6 <noreply@anthropic.com>
System and Service Manager
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