-But a related problem is how to specify sizes to guestfish, ie. "100M"
-or "1G". Currently the specific alloc and sparse functions contain
-code to parse these size strings, but that cannot be used anywhere
-else that would take a byte count. This is awkward because some
-commands take units of megabytes (lvresize, sfdiskM) or sectors
-(part-add), with no unifying theme.
+https://www.redhat.com/archives/libguestfs/2010-June/msg00053.html
+https://www.redhat.com/archives/libguestfs/2010-June/msg00079.html