Forum: CFEngine Help
Subject: Re: Evaluation of bundlesequence with constructed mybundle(@(args))
Author: jblaine
Link to topic: https://cfengine.com/forum/read.php?3,23499,23556#msg-23556
Seva Gluschenko Wrote:
-------------------------------------------------------
> You must import slists locally in order to use
> them in a bundle, e.g.:
>
>
> bundle agent main
> {
> vars:
> "servers" slist => { @(g.servers) };
> ...
> }
Seva, thanks for the reply. According to the CFEngine Reference, section 2.7.2
"List variable substitution and expansion", that should not be necessary as the
variable is global in scope (... @(g.ntpservers) from "bundle common g").
Lists can be passed around in their entirety in any context where a list is
expected
During list expansion (jblaine: which I am not doing here), only local lists
can be expanded, thus global list references have to be mapped into a local
context if you want to use them for iteration (jblaine: which I am not doing
here).
I tried it anyway. That didn't buy me anything (got worse actually):
/usr/local/sbin/cf-agent -D site_x -IK
!! List parameter "ntpservers" not found while constructing scope
"system_ntpclient_configure" - use @(scope.variable) in calling reference
!! List parameter "servers" not found while constructing scope
"ntpclient_config_edit" - use @(scope.variable) in calling reference
I reverted.
I did figure it out though. For some reason, which I would love to have
explained by someone who knows why, I had to explicitly scope all of the
variables involved all the way to the final actual expansion in the edit_line
bundle.
body common control
{
bundlesequence => { "main" };
# this works fine
inputs => { @(g.inputfiles) };
}
bundle common g
{
vars:
any::
"commoninputs" slist => {
"cfengine_stdlib.cf",
"all.cf"
};
"inputfiles" slist => {
@(commoninputs),
},
policy => "free";
site_x::
"ntpservers" slist => {
"time.sitex.our.org",
"time.sitey.our.org",
};
"inputfiles" slist => {
@(commoninputs),
"site_x.cf",
},
policy => "free";
}
bundle agent main
{
methods:
site_x:
"site_x" usebundle => system_ntpclient_configure(@(g.ntpservers));
}
bundle agent system_ntpclient_configure(servers)
{
files:
any::
# Using @(g.ntpservers) here would mean this bundle could not be
reused
# unless implementers set some global var, which is lame.
"/etc/ntp.conf"
edit_line =>
ntpclient_config_edit(@(system_ntpclient_configure.servers));
}
bundle edit_line ntpclient_config_edit(servers)
{
delete_lines:
".*";
insert_lines:
"#############################################################
### This file is configured by CFEngine.
### Manually editing the file might lead CFEngine
### to change back its content
#############################################################
server 127.127.1.0
fudge 127.127.1.0 stratum 10"
insert_type => "preserve_block",
location => start;
# Using $(g.ntpservers) here would mean this bundle could not be reused
# unless implementers set some global var, which is lame.
"server $(servers)";
}
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