[Libguestfs] do_umount adjustment

[Richard W.M. Jones]

On Wed, Aug 12, 2009 at 10:25:34AM +0200, Jim Meyering wrote:
> If do_umount is the only case like that (and it seems to be),
> a more local change is possible: if pathordevice starts with
> /sysroot/dev, remove the "/sysroot" part.
> 
> Not terribly pretty to add the prefix, and then to remove it
> right afterwards, but...

Ick.  Remember that "/sysroot" is not a constant.  It's the variables
sysroot and sysroot_len that contain the actual prefix.

Rich.

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