Re: Expanding variables in ReturnsZero function

[Mark . Burgess]

Actually, variables are expanded here, but youmust used ${} not $().
IsDefined and StrCmp are added to 2.0.4

M


On 25 Jul, To: paguerlais@airfrance.fr wrote:
> 
> This would not work anyway as written.
> Seems like some additional operators would be useful
> 
> IsDefined(var)
> StrCmp(s1,s2)
> 
> etc. Will add to next release -- once my RSI allows me to work again.
> 
> M
> 
> On 25 Jul, paguerlais@airfrance.fr wrote:
>> 
>> Hi all,
>> 
>> I want to give a variable with a default value if it's not already defined.
>> The only way I found to do that was to use a ReturnsZero function to test
>> the current value of the variable, and to initialize it it's null :
>> <cut>
>> control:
>>       host1::
>>             my_var = ( value_for_host1 )
>>       host2::
>>             my_var = ( value_for_host2 )
>> 
>> groups:
>>       my_var_is_already_valued = ( ReturnsZero(/bin/test -n "$(my_var)") )
>> 
>> control:
>>       !my_var_is_already_valued::
>>             my_var = ( some_default_value )
>> </cut>
>> 
>> It doesn't work because cfengine doesn't expand variables used in a command
>> for an internal function (I've spent some time reading functions.c,
>> popen.c, misc.c and varstring.c). Is this done in purpose (and the next
>> question is why), or was this feature simply forgot ? I'd like that feature
>> not only for command arguments, but also for the command itself (you define
>> a variable named TEST and valued with /bin/test, and you call ReturnsZero
>> ($(TEST) ... ))
>> 
>> Next, is there a better way to test if a variable has a value ?
>> 
>> Thanks
>> Patrice
>> 
>> 
>> 
>> 
>> 
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> 
> 
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Work: +47 22453272            Email:  Mark.Burgess@iu.hio.no
> Fax : +47 22453205            WWW  :  http://www.iu.hio.no/~mark
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Work: +47 22453272            Email:  Mark.Burgess@iu.hio.no
Fax : +47 22453205            WWW  :  http://www.iu.hio.no/~mark
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~