[Libguestfs] simplify debugging of guestfsd

[Richard W.M. Jones]

On Sun, Oct 14, 2012 at 07:02:29PM +0100, Richard W.M. Jones wrote:
> Introduce a new guestfs_create_flags () call which takes a flag
> variable.  By default, passing flag == 0 is entirely the same as
> guestfs_create.
> 
>   g = guestfs_create_flags (0);
>   if (!g) error;
> 
> However you could also use it like this:
> 
>   g = guestfs_create_flags (GUESTFS_CREATE_NO_ENVIRONMENT);
>   if (!g) error;
> 
> where no environment variable processing is done (hence no errors are
> possible except ENOMEM).  Callers can do environment variable
> processing later (see guestfs_set_environment above).  Or maybe not if
> they don't want to be affected by the environment.  Errors can be
> handled properly in those later calls.
> 
> In the language backends, we'd have to map this to more flexible
> functions, eg. in Perl:
> 
>   my $g = Sys::Guestfs->new (environment => 0);
> 
> (which is of course backwards compatible with existing code).

That took much longer than I thought it would ...

https://github.com/libguestfs/libguestfs/commit/9466060201600db47016133d80af22eb38091a49

Rich.

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