Exactly ! This is correct
Le 15/09/2011 20:45, Aleksey Tsalolikhin a écrit :
> I think I get it: ifvarclass does not build or make or set any class,
> it USES the class expression specified in the value of ifvarclass, and
> it uses it by ANDing it with the normal class expression.
>
> Best,
> Aleksey
>
> On Thu, Sep 15, 2011 at 4:49 PM, Nicolas Charles
> <nicolas.char...@normation.com> wrote:
>> No, what it says that you can use both the class expression and the
>> ifvarclass to conditionnaly execute a promise, and you can use variable
>> in the ifvarclass, that CFEngine will expand and match against an
>> existing class name
>> So it doesn't build a class, it checks if a class has the name (hence
>> the name of the attribute : ifvarclass)
>>
>> Regards
>> Nicolas
>>
>> Le 14/09/2011 14:08, Aleksey Tsalolikhin a écrit :
>>> Thank you, Seva. The reference manual states ifvarclass builds out a
>>> class from variable content:
>>>
>>> CFEngine 3 has a new class predicate ifvarclass which is ANDed with
>>> the normal class expression, and which is evaluated together with the
>>> promise. It may contain variables as long as the resulting expansion
>>> is a legal class expression.
>>>
>>> Best,
>>> Aleksey
>>>
>>>
>>> On Wed, Sep 14, 2011 at 12:34 AM, Seva Gluschenko
>>> <seva.glusche...@gmail.com> wrote:
>>>> Aleksey,
>>>>
>>>> Don't misguide newcomers ) The ifvarclass attribute does NOT create a
>>>> class from variable, it allows to build out a class name from a
>>>> variable content and check whether such class has been defined already
>>>> or not. To create (i.e. to define) a class from a variable, one must
>>>> use classes: section.
>>>>
>>>> 2011/9/14 Aleksey Tsalolikhin <atsaloli.t...@gmail.com>:
>>>>> Hi, Jerome. I suggest using cf-promises to check the syntax on your
>>>>> policy:
>>>>>
>>>>> [cfengine00 ~]# cf-promises -f ./test.cf
>>>>> Arguments to function readfile(.) do not tally. Expect 2 not 1
>>>>> Promise (version not specified) belongs to bundle 'g' in file
>>>>> './test.cf' near line 5
>>>>> [cfengine00 ~]#
>>>>>
>>>>> You have to tell readfile max number of bytes to read from the file.
>>>>>
>>>>>
>>>>> If you want to explicitly make a class (rather than just use
>>>>> ifvarclass to create
>>>>> the class), you can do it with a classes type promise as Seva suggested.
>>>>>
>>>>> {{{
>>>>>
>>>>> bundle common g
>>>>> {
>>>>> vars:
>>>>>
>>>>> "temp" string => readfile( "/tmp/test.txt", "99" );
>>>>>
>>>>> classes:
>>>>> "$(temp)" expression => "any";
>>>>> }
>>>>>
>>>>> bundle agent animal
>>>>> {
>>>>> commands:
>>>>> "/bin/echo $(g.temp)"
>>>>> ifvarclass =>
>>>>> canonify("$(g.temp)");
>>>>> reports:
>>>>> DOG::
>>>>> "I have a pet dog.";
>>>>> }
>>>>>
>>>>> }}}
>>>>>
>>>>> How's that?
>>>>>
>>>>> Aleksey
>>>>>
>>>>>
>>>>> On Tue, Sep 13, 2011 at 11:36 AM, Jerome Yanga <jya...@esri.com> wrote:
>>>>>> Aleksey,
>>>>>>
>>>>>> I came up with the following but I seem to be misinterpreting the
>>>>>> reference manual. I have also used canonify to no avail. Help.
>>>>>>
>>>>>> $ cat /tmp/test.txt
>>>>>> DOG
>>>>>>
>>>>>> bundle common g
>>>>>> {
>>>>>> vars:
>>>>>>
>>>>>> "temp" string => readfile( "/tmp/test.txt" );
>>>>>> }
>>>>>>
>>>>>> bundle agent animal
>>>>>> {
>>>>>> commands:
>>>>>> "/bin/echo $(g.temp)"
>>>>>> ifvarclass => "$(g.temp)";
>>>>>> reports:
>>>>>> DOG::
>>>>>> "I have a pet dog.";
>>>>>> }
>>>>>>
>>>>>> Regards,
>>>>>> j
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Aleksey Tsalolikhin [mailto:atsaloli.t...@gmail.com]
>>>>>> Sent: Tuesday, September 13, 2011 11:20 AM
>>>>>> To: Jerome Yanga
>>>>>> Cc: help-cfengine@cfengine.org
>>>>>> Subject: Re: CFEngine Help: how to convert vars to a class
>>>>>>
>>>>>> Yes, you can do it using the ifvarclass, which converts a variable to
>>>>>> a class. Could you please read the ifvarclass section of the
>>>>>> reference manual, and let me know if you have any questions.
>>>>>>
>>>>>> Best,
>>>>>> Aleksey
>>>>>>
>>>>>>
>>>>>> On Tue, Sep 13, 2011 at 11:13 AM, Jerome Yanga <jya...@esri.com> wrote:
>>>>>>> Is it possible to do what I am attempting to?
>>>>>>>
>>>>>>> Regards,
>>>>>>> j
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Jerome Yanga
>>>>>>> Sent: Monday, September 12, 2011 4:27 PM
>>>>>>> To: 'Aleksey Tsalolikhin'
>>>>>>> Cc: 'help-cfengine@cfengine.org'
>>>>>>> Subject: RE: CFEngine Help: how to convert vars to a class
>>>>>>>
>>>>>>> Aleksey,
>>>>>>>
>>>>>>> Thank you for the quick response.
>>>>>>>
>>>>>>> My main objective is to make the contents of /tmp/test.txt into a
>>>>>>> class. Hence, I would like to do the reporting.
>>>>>>>
>>>>>>> bundle agent animal
>>>>>>> {
>>>>>>> reports:
>>>>>>> DOG::
>>>>>>> "I have a pet dog.";
>>>>>>> }
>>>>>>>
>>>>>>> Regards,
>>>>>>> j
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Aleksey Tsalolikhin [mailto:atsaloli.t...@gmail.com]
>>>>>>> Sent: Monday, September 12, 2011 4:15 PM
>>>>>>> To: Jerome Yanga
>>>>>>> Cc: help-cfengine@cfengine.org
>>>>>>> Subject: Re: CFEngine Help: how to convert vars to a class
>>>>>>>
>>>>>>> On Mon, Sep 12, 2011 at 3:58 PM, Jerome Yanga <jya...@esri.com> wrote:
>>>>>>>> I saw another post on how to do this but it does not seem to work for
>>>>>>>> me. Please correct my syntax
>>>>>>> How's this?
>>>>>>>
>>>>>>> [cfengine00 ~]# cat /tmp/test.txt
>>>>>>> DOG
>>>>>>> [cfengine00 ~]# cat test.cf
>>>>>>> body common control {
>>>>>>> bundlesequence => { "animal" };
>>>>>>> }
>>>>>>>
>>>>>>> bundle common g
>>>>>>> {
>>>>>>> vars:
>>>>>>>
>>>>>>> "temp" string => readfile("/tmp/test.txt", "4" );
>>>>>>> }
>>>>>>>
>>>>>>> bundle agent animal
>>>>>>> {
>>>>>>> commands: "/bin/echo $(g.temp)";
>>>>>>> commands:
>>>>>>> "/bin/echo I have a pet dog."
>>>>>>> ifvarclass => "$(g.temp)";
>>>>>>> }
>>>>>>> [cfengine00 ~]# cf-agent -f ./test.cf
>>>>>>> Q: ".../bin/echo DOG": DOG
>>>>>>> I: Last 1 quoted lines were generated by promiser "/bin/echo DOG"
>>>>>>> [cfengine00 ~]#
>>>>>>>
>>>>>>> Note the use of ifvarclass attribute to use a variable as a class; and
>>>>>>> the full name of the variable (including the bundle name) in g.temp.
>>>>>>> CFEngine bundles have scope, so you have to use the full name to call
>>>>>>> a variable from another bundle (even a global variable).
>>>>>>>
>>>>>>> Yours,
>>>>>>> -at
>>>>>>>
>>>>>>>
>>>>> _______________________________________________
>>>>> Help-cfengine mailing list
>>>>> Help-cfengine@cfengine.org
>>>>> https://cfengine.org/mailman/listinfo/help-cfengine
>>>>>
>>>>
>>>> --
>>>> SY, Seva Gluschenko.
>>>>
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