Forum: CFEngine Help
Subject: Re: CFEngine Help: Re: bundle common variables
Author: sauer
Link to topic: https://cfengine.com/forum/read.php?3,25444,25457#msg-25457
Nick Anderson Wrote:
-------------------------------------------------------
> On 04/03/2012 10:52 AM, Denis Zinevich wrote:
> > btw, one more clarification about bundle common
> >
> > do i have to include my common bundles to
> > body common control bundlesequence ?
>
> They will either have to be in the bundlesequence
> or you will need to call them with a methods type promise.
To clarify (or muddy): variables defined in included files exist even if the
actual bundles they're in are not in the bundlesequence or ever otherwise
executed. Same deal with classes defined in common bundles. The exception is
that variables and classes used in the common control body need to be defined
directly in promises.cf; they can't be in included files at all, because the
file inclusion happens after common control has been processed.
But anyway, the vars-are-defined-without-the-bundle-being-"run" thing has an
interesting side effect. If you have a variable or class which executes a
program (via execresult() or similar), that program gets run both by
cf-promises (possibly three times) and by cf-agent (again, probably three
times) even if you take the containing bundle out of the bundlesequence.
Further, if you do that in a common bundle, the program gets run by all
binaries when they reevaluate the policy - including cf-execd, cf-serverd, and
cf-monitord.
root@host:/tmp # cat include.cf
body common control {
inputs => { "otherinclude.cf" };
bundlesequence => { "a" };
}
bundle common a {
reports:
cfengine:: "Imported variable is $(otherbundle.othervar)";
}
root@host:/tmp # cat otherinclude.cf
bundle agent otherbundle {
vars:
"othervar" string => execresult("/bin/echo hello", "noshell");
}
root@host:/tmp # cf-agent -Kf ./include.cf
R: Imported variable is hello
cf-serverd example, changing the command to touch:
root@host:/tmp # cat otherinclude.cf
bundle agent otherbundle {
vars:
"othervar" string => execresult("/bin/touch /tmp/file", "noshell");
}
root@host:/tmp # rm /tmp/file
root@host:/tmp # cf-serverd -f ./include.cf
Could not bind server address
!!! System error for bind: "Address already in use"
Could not bind server address
!!! System error for bind: "Address already in use"
Couldn't open bind an open socket
root@host:/tmp # ls /tmp/file
/tmp/file
And even cf-promises:
root@host:/tmp # rm /tmp/file
root@host:/tmp # cf-promises -f ./include.cf
root@host:/tmp # ls /tmp/file
/tmp/file
Neat, eh? It makes sense, but is something to be aware of.
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