Table of Contents
isvariable
Table of Contents
Prototype: isvariable(var)
Return type: boolean
Description: Returns whether a variable named var
is defined.
The variable need only exist. This says nothing about its value. Use
regcmp
to check variable values. Variable references like foo[bar]
are also checked, so this is a way to check if a classic CFEngine
array or a data container has a specific key or element.
Arguments:
var
:string
, in the range:.*
Example:
body common control
{
bundlesequence => { "example" };
}
bundle agent example
{
vars:
"bla" string => "xyz..";
classes:
"exists" expression => isvariable("bla");
reports:
exists::
"Variable exists: \"$(bla)\"..";
}
Output:
R: Variable exists: "xyz.."..