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- Add a new parameter `imageType` that can specify either "efi" or "legacy" (the default which should see no change in behaviour by this patch). - EFI images get a GPT partition table (instead of msdos) with a mandatory ESP partition (so we add an assert that `partitioned` is true). - Use the partx tool from util-linux to determine exact start + size of the root partition. This is required because GPT stores a secondary partition table at the end of the disk, so we can't just have mkfs.ext4 create the filesystem until the end of the disk. - (Unrelated to any EFI changes) Since we're depending on the `-E offset=X` option to mkfs which is only supported by e2fsprogs, disallow any attempts of creating partitioned disk images where the root filesystem is not ext4.
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