One further thought on this:
Looking down the road a bit, we may want to consider handling the "if"
attribute of a classes promise the same way as the "expression" attribute,
or vice versa.
I would imagine that newcomers to CFEngine will have no particular reason
to ever use the "expression" attribute at all, when the default expression
is "any" and they can express the more complex conditionals they will need
with an "if" attribute (or an "and" attribute, or "or" attribute, etc.)
without ever learning "expression."
Currently, the verbose output based on "expression" is different from that
based on "if" (example shown is running 3.7.1):
[root@hub tmp]# cat classes.cf
bundle agent main {
classes:
any::
"set_by_expression"
expression => "any";
"set_by_if_and_expression"
if => "any",
expression => "any";
"unset_by_if"
expression => "any",
if => "!any";
"unset_by_expression"
expression => "!any";
}
[root@hub tmp]# cf-agent -f ./classes.cf -vKC | sed -n '/pass 1/,/pass 2/p'
verbose: C: BEGIN classes / conditions (pass 1)
verbose: C: .........................................................
verbose: C: + Private class: set_by_expression
verbose: C: + Private class: set_by_if_and_expression
verbose: Skipping promise 'unset_by_if', for if/ifvarclass is not in scope
verbose: C: .........................................................
verbose: C: BEGIN classes / conditions (pass 2)
[root@hub tmp]#
As illustrated above, a class whose "expression" is false is not even
mentioned in the verbose output, whereas a class whose "expression" is true
but whose "if" is false *is* shown.
Perhaps the handling should be the same? (This would be a special case for
the "if" attribute for classes promises only, to make it behave the same as
an "expression" attribute.)
--Mike Weilgart
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