Clayton Craft
47d408163b
Some devices (e.g. android phones running pmOS) cannot have their OEM partition table altered without breaking the firmware, so the distros's partitions live inside a nested GPT carved into one of the OEM partitions. Exposing these subpartitions requires wrapping the outer partition in a loop device with partscan enabled, since the kernel does not go into nested partition tables. systemd already detects this case in udev-builtin-blkid (ID_PART_GPT_AUTO_ROOT_DISK_NEEDS_LOOP) and acts on with systemd-loop@.service, but this fails towards the end. loop_device_make_internal has an optimization where if the input is already a block device with a matching sector size, it skips creating a loop and just hands back the original fd. That's fine for whole disks but wrong for partitions, which don't support partscan, so this causes dissect_image to fail with EPROTONOSUPPORT. This patch changes the behavior to only take the shortcut when the input is a whole disk, or when partscan was not requested. Co-Authored-By: Clayton Craft <clayton@craftyguy.net>
System and Service Manager
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