Greg Swift wrote:
On Mon, Jan 5, 2009 at 10:37, Michael DeHaan <mdehaan@xxxxxxxxxx
<mailto:mdehaan@xxxxxxxxxx>> wrote:
Michael DeHaan wrote:
Casey Dahlin posted an idea on my blog that I thought was a
good one...
What if we had an ORM for systems? When he first posted it,
my initial thought was "Func already does this", though there
are some subtle changes:
His example was more complicated, but what if we could do
something like:
Client("*.example.org
<http://example.org>").filter_by(arch==i386).services.start("httpd")
?
(I'll admit the critera syntax could be much better)
The only new thing here is the concept of filtering. The goal
here would be that instead of getting back the inventory for
each system, we instead find a way to send the conditional
"run this if" critera down to each node. This may be better
served as a library a level up from Func, so we could also
work on having more "objecty" returns for it if we wanted to
do this -- ultimately this might mean it's our higher level
Func API after all.
It does seem to want or require something like a facter, but I
need to evaluate whether that would meet the needs for what I
want to do -- I suspect it's not sufficiently Pythonic and we
may want to do something different.
Anyway, doing something higher level and primarily using Func
for (secure, audited) transport may not be such a bad idea.
Here was the post: http://www.michaeldehaan.net/?p=821
Either way, I think the above could be done by outsourcing the
decision making to the nodes, so we don't have to keep an
updated database of all the nodes properties.
--Michael
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To be clear, I don't want something as complicated as an ORM or
Casey's example, per se, I was pondering whether the "run this if"
example is interesting.
i think its a good idea. not everyone's dns alone provides enough of
a delimiter to base selection on, and it is probably something many
people that write scripts on top of func will end up writing some sort
of work around for, so it would be good to have as part of the base.
-greg/xaeth
yeah, basically it's "Smart Func Groups", similar to smart albums or
smart folders, though they might not be defined in the groups file
(maybe they could be).
I still think we need to get some better (English) use cases around this
though.
"Desktop systems still running Fedora 7, run koan to update yourselves
to Fedora 8?"
"Systems that take Dell firmware, use koan to run this Dell firmware
update profile"
"Systems with this package installed, do this?"
Etc.
Command line could look like
func "*.partof.example.com" --filter "release == fc8" call command run
"/usr/bin/koan --profile=f8desktop && reboot"
???
--Michael
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