[Freeipa-devel] Proposed changes to the HBAC grammar

[Adam Young]

On 11/18/2010 05:27 PM, Dmitri Pal wrote:
> Adam Young wrote:
>    
>> On 11/18/2010 04:02 PM, Stephen Gallagher wrote:
>> On 11/18/2010 09:55 AM, Dmitri Pal wrote:
>>
>>      
>>>>> Steve can you summarize where we are and what we agreed to,
>>>>>            
>> please, and
>>      
>>>>> identify the questions that we need to answer.
>>>>>
>>>>>            
>> Simo, Adam and I had a long discussion on IRC regarding the time rules
>> today (complete log attached).
>>
>> The short version is that we're going to continue (mostly) with the
>> current grammar for the time rules, with a few changes.
>>
>> 1) We need to replace week-of-the-month with day-of-the-septet. This day
>> should not be a range or multi-valued to eliminate confusion
>> 2) We need to replace the time range with a duration
>> 3) We should add startDate and endDate as attributes on the HBAC object
>> (separate from the accessTime). I propose these should be in LDAP
>> generalizedTime so that it's possible to construct filters around them.
>> This effectively sets the beginning and end of a periodic schedule.
>>
>>
>>      
>>> OK, just please stop calling it septet.  I think Drums, Bass, Piano,
>>>        
>> 2 Saxes,  Trumpet,  Trombone Jazz combo when I hear that.  It isl ike
>> octet versus byte....it means the same thing, and just annoys people.
>>
>>      
>>> What you really want is to call it week-of-the-month as opposed to
>>>        
>> week.  I realize that is more verbose, but we don't sound like
>> smarty-pants.
>>
>>
>>
>>
>> I've drawn up a new grammar definition and published it to the SSSD wiki
>> (not currently linked from anywhere):
>> https://fedorahosted.org/sssd/wiki/HBAC_Grammar
>>
>> Please review and give feedback.
>>
>>
>>      
> I thought that first septet is the first seven days of the month based
> on earlier mails from Steven. Is this a true statement?
> The whole issue started with ambiguity of the notion of the "N-th week"
> of the month.
> What is it the week-of-the-month? Is it first seven day regardless what
> day of the week is the first day of the month (this is what I thought a
> septet is) or fist full week from Monday to Sunday or from Sunday to
> Saturday, or it is the first usually partial week? This is the ambiguity
> that we want to avoid!
>
> If the septet is what I think it is then we can't name it the
> week-of-the-month and IMO septet is a good term here. However then there
> is a bug in grammar as septet can be only 1-5 not 1-6.
>    

OK, if this is really what is driving the grammar, I'm going to have to 
NACK.

Lets make something that is intelligible.  We don't want to be inventing 
concepts like Septet.  Or Septave, since 8 days is already called an octave.

Here's the Cron line that Steve posted before.  It represents   THe 
first wednesday of the month.

0 8 1-7 * 3


Lets keep the concept of week, starting on Sunday, add in the concept of 
day of the month, and mix the two together.

Does the current grammar (pre-septet) support that?  Something like:

accessTime: periodic monthly between day 1-7  wednesday





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