On 07/13/2012 06:41 PM, no-re...@cfengine.com wrote: > Forum: CFEngine Help > Subject: Re: Using defaults promises > Author: zzamboni > Link to topic: https://cfengine.com/forum/read.php?3,26464,26465#msg-26465 > > Neil, > > The default value kicks in only when the variable in question is not defined. > In your example, "version" *is* defined - although because the corresponding > hash element does not exist, you get the raw string, without any > interpolation. But this is still a valid, defined string value, so the > default value is not used. > > However, CFEngine default values can also be conditioned on certain patterns, > using the if_match_regex attribute: > https://cfengine.com/manuals/cf3-Reference#if_005fmatch_005fregex-in-defaults > > Using if_match_regex, you could check if the variable starts with a dollar > sign, which would most likely indicate that it's a non-interpolated value. So > this change makes your example work: > > > defaults: > "version" string => "Not provided", if_match_regex => "(^$)|(^\$.*$)"; > > > In this case the default value kicks in if the string is empty or if it > starts with a dollar sign. > > Neat isn't it? :) >
Should cfengine detect that the variable has not been resolved and use the default value? -- ******************************************************************** * Bas van der Vlies e-mail: b...@sara.nl * * SARA - Academic Computing Services Amsterdam, The Netherlands * ********************************************************************
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