help-cfengine
[Top][All Lists]
Advanced

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

Re: packages "bug"


From: Mark Burgess
Subject: Re: packages "bug"
Date: Sun, 13 Nov 2005 09:00:39 +0100

Brendan you have

> > >         bash
> > >             pkgmgr=rpm
> > >             define=bash_pkg_installed


> > >         bash
> > >             pkgmgr=rpm
> > >             define=bash_package_installed

i.e. the "do part" is the same in both cases, so both defines would
always be true, except that cfengine thinks (rightly I believe) that
it is unnecessary to do the same thing twice, so only one gets defined.
There are no other classes that I can see...

M

On Sat, 2005-11-12 at 19:02 -0600, Brendan Strejcek wrote:
> Mark Burgess wrote:
> 
> > Your example doesn't make sense to me, because you are asking to the
> > same package twice - so it seems reasonable to me that cfengine would
> > think it was unnecessary to do the same thing again. The two checks
> > are identical?
> 
> The checks are not identical because they define different classes. Two
> separate tasks could do very different things based on that information.
> 
> Best,
> Brendan
> 
> --
> Senior System Administrator
> The University of Chicago
> Department of Computer Science
> 
> http://www.cs.uchicago.edu/people/brendan
> 
> http://people.cs.uchicago.edu/~brendan
> 
> 
> > On Fri, 2005-11-11 at 16:40 -0600, Brendan Strejcek wrote:
> > > cfengine locking can get in the way of package definitions. For example,
> > > consider the following:
> > > 
> > > ########################################################################
> > > 
> > > ==> main.cf <==
> > > 
> > >     #!/usr/sbin/cfagent -qvf
> > >     
> > >     control:
> > >         actionsequence = ( packages )
> > >     
> > >     import:
> > >         /tmp/one.cf
> > >         /tmp/two.cf
> > > 
> > > ==> /tmp/one.cf <==
> > > 
> > >     packages:
> > >         bash
> > >             pkgmgr=rpm
> > >             define=bash_pkg_installed
> > >     
> > >     alerts:
> > >         bash_pkg_installed::
> > >             "one.cf: bash_pkg_installed class defined"
> > > 
> > > ==> /tmp/two.cf <==
> > > 
> > >     packages:
> > >         bash
> > >             pkgmgr=rpm
> > >             define=bash_package_installed
> > >     
> > >     alerts:
> > >         bash_package_installed::
> > >             "two.cf: bash_package_installed class defined"
> > > 
> > > ########################################################################
> > > 
> > > When I run that, this is what happens:
> > > 
> > >     Installable classes = ( bash_pkg_installed bash_package_installed )
> > >     ...
> > >     RPMCheckPackage(): Requested bash eq ANY
> > >     cfengine:: Nothing scheduled for packages.packages (0/1 minutes 
> > > elapsed)
> > >     ...
> > >     ---------------------------------------------------------------------
> > >     Alerts
> > >     ---------------------------------------------------------------------
> > >     cfengine:: one.cf: bash_pkg_installed class defined
> > > 
> > > We can see that the second class is not getting defined due to a lock.
> > > Why is this bad? It means that any admin that defines a class like
> > > this needs to understand the entire site config, or actions predicated
> > > on their class may never occur. I suspect other sections may exhibit
> > > similar behavior, but I have not tested it yet.
> > > 
> > > Fundamentally, I think this is a problem of scope and namespaces. I
> > > think that is one of the weakest elements of cfengine, so I hope it
> > > is addressed in version 3. Namespaces are intimately connected with
> > > reusability.
> > > 
> > > Best,
> > > Brendan
> > > 
> > > --
> > > Senior System Administrator
> > > The University of Chicago
> > > Department of Computer Science
> > > 
> > > http://www.cs.uchicago.edu/people/brendan
> > > 
> > > http://people.cs.uchicago.edu/~brendan
> > > 
> > > 
> > > _______________________________________________
> > > Help-cfengine mailing list
> > > address@hidden
> > > http://lists.gnu.org/mailman/listinfo/help-cfengine
> > 
> > 





reply via email to

[Prev in Thread] Current Thread [Next in Thread]