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Currently the guestfs_isoinfo and guestfs_isoinfo_device APIs run isoinfo inside the appliance to extract the information. isoinfo is part of genisoimage which is somewhat dead upstream. xorriso is supposedly the new thing. (For a summary of the situation see: https://wiki.debian.org/genisoimage). This commit rewrites the parsing from C to OCaml to make it easier to deal with, and allows you to use either isoinfo or xorriso. Mostly the same fields are available from either tool, but xorriso is a bit more awkward to parse.