[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [Libvir] [PATCH] add global --readonly flag to virsh

Daniel P. Berrange wrote:
On Mon, Mar 05, 2007 at 05:22:28PM +0000, Richard W.M. Jones wrote:
The current vshInit function in virsh tries some dodgy heuristics to see if it should connect readonly or read/write to the hypervisor. Unfortunately these heuristics fail, eg. when you have a root-owned system-wide qemud, and a user trying to run virsh as non-root.

This patch removes the heuristics and replaces them with a simple -r | --readonly flag on the command line. If omitted, we try to connect read/write, otherwise we try to connect readonly.

I like this patch, but I don't think we can apply it in exactly the
form it is now. There may well be people already using virsh in a
non-root context with Xen, and this will break them requiring them
to add a --readonly arg in. I think we should add the explicit
--readonly flag patch attached, but also put in a simplified heuristic for the Xen non-root case. I'd think I'd add in a snippet of code looking like:

if (ctl->uid != 0 && (ctl->name == NULL || !strcmp(ctl->name, "Xen"))
        ctl->readonly = TRUE;

If people agree, I'll apply Rich's patch with this addition ?

Agreed, unless we want an explicit --readwrite to override this heuristic :-)


Emerging Technologies, Red Hat  http://et.redhat.com/~rjones/
64 Baker Street, London, W1U 7DF     Mobile: +44 7866 314 421
 "[Negative numbers] darken the very whole doctrines of the equations
 and make dark of the things which are in their nature excessively
 obvious and simple" (Francis Maseres FRS, mathematician, 1759)

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature

[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]