[Libguestfs] [PATCH INCOMPLETE 0/4] v2v: Add general mechanism for input and output options.

[Richard W.M. Jones]

This patch isn't quite complete (see ‘assert false’).

Currently we have a bunch of ad hoc options like --vddk* and --vdsm*
(and proposed to add --rhv*) to handle extra parameters for input and
output modes/transports.  This complicates the command line parsing
and also the clarity of the command line (becauseit's not very obvious
which options apply to which side of the conversion).
    
Replace these with a general mechanism for handling input and output
options.
    
Thus (for example):
    
      --vddk-thumbprint=...   becomes   -io vddk-thumbprint=...
      --vdsm-compat=0.10                -oo vdsm-compat=0.10
    
The responsibility for parsing input and output options moves into the
input and output drivers.
    
This improves error checking so it's harder now for wrong flags to be
included on the command line when they don't apply to the current mode.
    
The old option names are preserved for compatibility.

Rich.