Re: [Xen-devel] [PATCH] libxl: prevent xl from running if xend is running.

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2012-04-24 at 15:47 +0100, Ian Jackson wrote:
> Ian Campbell writes ("Re: [Xen-devel] [PATCH] libxl: prevent xl from running 
> if xend  is running."):
> > You could consider this to be a best effort check for xend. IOW we try
> > and look but if we can't tell then we assume it is not.
> 
> I guess.
> 
> > It's not terribly robust to just blunder on, but on the other hand being
> > more robust has a bigger risk of false positives, e.g. failing to start
> > xl because /var/lock/subsys/ does not exist isn't especially helpful
> > either (the EACCESS return code doesn't distinguish that
> > from /var/lock/subsys/xend not existing).
> 
> EACCES would happen only if the permissions prevented us from
> looking.  If /var/lock/subsys doesn't exist we'll get ENOENT, the
> "good" error return.

Oh, right.

Well, not starting because the perms on /var/lock/subsys are too tight
(e.g. selinux restricting it to initscripts only? unrealistic maybe)
seems unhelpful too.

(I admit this isn't as compelling as my previous example).

Ian.


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