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RE: Eval'd class to detect installed packages...


From: Craig Nelson
Subject: RE: Eval'd class to detect installed packages...
Date: Tue, 24 Dec 2002 10:18:13 -0800

I would be extremely interested in HasPackage functionality. We use RedHat but have recently deployed apt/rpm and it is so incredibly useful. I have a prototype module I was working on where you passed it a list of packages you wanted to check and it set classess if they were installed. Having the functionality built in would be a great boon.

So far as deb versus rpm, I would suggest the compile time flag option. Packages can be difficult enough to build (not that cfengine is) without having to port headers from another distribution over.

~Thanks!


> -----Original Message-----
> From: Phil D'Amore [mailto:address@hidden]
> Sent: Monday, December 23, 2002 8:50 AM
> To: address@hidden; address@hidden
> Subject: Eval'd class to detect installed packages...
>
>
> Hello...
>
> I currently have a patch against 2.0.5pre2 that creates a new
> evaluated
> class that allows one to determine if a given package is
> installed on a
> system.  I only have RPMs to deal with here so the class
> turned out to be
>
> RPMHasPackage ( <name> <relop> <[epoch:]version[-release]>)
>
> Where <relop> is just the usual combinations of <, >, and =.
>
> My intentions at the moment were to be able to allow cfengine
> to detect whether packages needed to be installed, and to
> alter what was done based on the version of an existing package.
>
> After showing this to Mark, he wondered if it could be made
> more generic, to allow for the same thing with debian
> packages.  My immediate thought was to rename the class
> simply HasPackage, keeping the syntax.  Some issues I am
> looking for thoughts on:
>
> 1.  Is anyone interested in this?  Is it worth my time to
> make this work, or should I just go away and mind my own business?
>
> Assumung #1 is yes, some other issues...
>
> 2.  RPM has a 3 part "version", with an epoch, a version, and
> a release.  Dpkg seems to have a version and a release.  In
> practice I would imagine it would be fine to just drop the
> epoch from the version string if it is passed in and we are
> debian.  Perhaps warn in the debug output.
>
> 3.  Building in the support.  I see 2 ways to do this.  First
> and probably easiest is that you get one package system per
> binary.  That is, you tell configure which package system you
> want and it makes you a binary with the right code.  This is
> fine for folks who package cfengine like me, since you can
> have a debian package for debian boxes and a red hat package
> for red hat boxes, each with the proper support.  If there
> are folks doing this sort of thing with all linux boxes on a
> NFS mount that could be an issue.  The other alternative to
> accomodate that is to create a binary that dlopen()s the
> proper libs at runtime based on the running OS.  I've never
> done that before, however.  The one caveat I can see there is
> your build host needs to have both rpm and dpkg libs (or at
> least headers) to make the build work for both.
>
> 4.  Not a big issue, but I have no idea how to make this work
> for dpkg.  If anyone knows how to easily do this for dpkg,
> input from you would be most appreciated :).  A quick search
> for docs on the API yesterday did not turn up much.
>
> Sorry for the length.  Anyone with thoughts on what the Right
> Thing should be?  I currently lurk on bug-cfengine but not
> help-cfengine, so if writing to the latter, please Cc: me.
>
> Thanks,
>
> --
> Phil D'Amore                             "Y'know, there was a
> time when
> Senior System Administrator               corporate
> responsibility meant
> Red Hat, Inc                              having the decency
> to jump out of
> Office: 919.754.3700 x44395               a window when you
> got caught"
> Cell:   919.641.3669                         -- Non-Sequitur,
> 09/30/2002
>
>
>
>
> _______________________________________________
> Help-cfengine mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/help-cfengine
>


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