Re: [Libguestfs] New tool proposal
On 05/28/2012 03:48 PM, Richard W.M. Jones wrote:
On Sun, May 27, 2012 at 02:52:59PM +0800, Wanlong Gao wrote:
> I looked into this, now Rich, I have a more question,
> if we doing like
> virt-diff --seed Guest0 -d Guest1 -d Guest2 /etc
> We can mount the device of Guest0 to "/", but where the devices from Guest1
and Guest2 can be mounted?
The mkmountpoint call allows you to have multiple "roots":
http://libguestfs.org/guestfs.3.html#guestfs_mkmountpoint
*However*, this won't work for general guests, where for example two
guests might have conflicting logical volumes or UUIDs which are
duplicated. It's simply not possible to safely mount multiple guests
in a single appliance. The solution is to use two libguestfs handles.
It seems hard to launch two libguestfs handles at the same time, right?
Now, many functions like inspect_mount(), inspect_do_decrypt() use the
global libguestfs handle without any argument, so, when inspecting two
different handles, we can't use these functions now, would you like to
make them being able to handle individual libguestfs handles?
And, some global values like live, read_only, etc.
And, we haven't considered that we could launch more than one libguestfs
handles at the same time, right? Are there some troubles doing things like
this?
Thanks,
Wanlong Gao
Rich.