Puppet users - Apr 2013 - Duplicate Declaration of resource (editing contents of same file in two diiferent module)

Hi all,
     I am writing two modules abc and xyz. In both the modules i have to 
change common "test.txt" file,here i use template (.erb) file to
changing
the contents.
In both abc and xyz the contents of "test.txt" file is different, if i
declare file resource for "test.txt" file in two different modules it
gives
duplicate declaration of resource error. 
For the correct working of modules abc and xyz, i have to change the 
test.txt file twice.
How i overcome this situation ?       
    I  am new to community, so i am not very familiar to format of query 
posting,sorry about that.
Thanks in advance for answers.

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On Thursday, April 11, 2013 1:11:16 PM UTC-5, Rahul Khengare
wrote:
>
> Hi all,
>      I am writing two modules abc and xyz. In both the modules i have to 
> change common "test.txt" file,here i use template (.erb) file to
changing
> the contents.
> In both abc and xyz the contents of "test.txt" file is different,
if i
> declare file resource for "test.txt" file in two different
modules it gives
> duplicate declaration of resource error. 
> For the correct working of modules abc and xyz, i have to change the 
> test.txt file twice.
> How i overcome this situation ?       
>     I  am new to community, so i am not very familiar to format of query 
> posting,sorry about that.
> Thanks in advance for answers.
>
You can''t do that.  The only way you can have two modules edit the same
file is if you use file_line or augeas, and even then, you need to make 
sure they don''t step on each other''s toes.

You would probably be better off pulling that file either into it''s own
module or into a wrapper class that combined the chagnes both of the others 
need to make.
 

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On Thursday, April 11, 2013 1:11:16 PM UTC-5, Rahul Khengare
wrote:
>
> Hi all,
>      I am writing two modules abc and xyz. In both the modules i have to 
> change common "test.txt" file,here i use template (.erb) file to
changing
> the contents.
> In both abc and xyz the contents of "test.txt" file is different,
if i
> declare file resource for "test.txt" file in two different
modules it gives
> duplicate declaration of resource error. 
> For the correct working of modules abc and xyz, i have to change the 
> test.txt file twice.
> How i overcome this situation ?       
>

You need to frame the problem correctly.  A File resource represents a 
whole, specific file.  What is it even supposed to mean if you specify the 
same target file''s content differently in different places?  Your two 
declarations cannot both be satisfied.  This sort of internal inconsistency 
is one of the reasons for Puppet''s prohibition against multiple 
declarations of the same resource (though that prohibition applies even 
when two or more declarations all specify exactly the same parameters).

There are at least two different things you could reasonably mean:


   1. Most likely, you mean that you want to separately describe two or 
   more different parts of the same file.  In that case you are incorrect to 
   model the parts as File resources, because they are not whole files.  There 
   are multiple ways to handle this, but a good one would be via the Concat 
   module, which you can find on the module forge.  It will allow you to model 
   individual pieces of a file, and to specify how they are to be assembled to 
   form the whole.
   2. You could mean that you want to declare separate files whose contents 
   are based on the same template.  In that case it is correct to use separate 
   File resources, but you must be declaring them wrongly.  Each one must have 
   a unique title and a unique absolute filename (path property); if not 
   specified explicitly, the absolute filename is the same as the title.  
   There is no inherent need for the resource title or target file name to 
   have any particular relationship with the template file name (though you 
   will make it easier on yourself if you choose something that helps you 
   associate them).
   

Good luck,

John

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thanks for reply,

first let me again describe my problem in detail.
I have two database server db01 and db02, on the database server (db01) i 
have to install and configure postgresql and pg_statinfo module and on 
database server(db02) i have to install and configure only postgresql.

I created postgresql module to install and configure postgresql and 
pg_statsinfo module for pg_statsinfo.
Here, "postgresql.conf" file contains the configuration for both
postgresql
and pg_statsinfo.(This is the common file which is to be edited, i use 
template to make changes),
for the pg_statsinfo module i have to add the addition contents to file 
plus change some in between contents.

I am not able to change postgresql.conf file twice in postgresql module and 
then pg_statsinfo module in case of db01, it give duplication declaration 
of file resources.
If i change the contents of postgresql.conf file in postgresql module then 
in case of db02 the postgresql not working because some addition parameters 
of pg_statsinfo in postgresql.conf.

i hope this help you to understand the scenario,  
how i maintain the modularity between to modules and change the same file 
twice for correct working.

Thanks in advance.
Rahul






  
 

On Friday, April 12, 2013 6:45:37 PM UTC+5:30, jcbollinger
wrote:
>
>
>
> On Thursday, April 11, 2013 1:11:16 PM UTC-5, Rahul Khengare wrote:
>>
>> Hi all,
>>      I am writing two modules abc and xyz. In both the modules i have
to
>> change common "test.txt" file,here i use template (.erb) file
to changing
>> the contents.
>> In both abc and xyz the contents of "test.txt" file is
different, if i
>> declare file resource for "test.txt" file in two different
modules it gives
>> duplicate declaration of resource error. 
>> For the correct working of modules abc and xyz, i have to change the 
>> test.txt file twice.
>> How i overcome this situation ?       
>>
>
>
> You need to frame the problem correctly.  A File resource represents a 
> whole, specific file.  What is it even supposed to mean if you specify the 
> same target file''s content differently in different places?  Your
two
> declarations cannot both be satisfied.  This sort of internal inconsistency
> is one of the reasons for Puppet''s prohibition against multiple 
> declarations of the same resource (though that prohibition applies even 
> when two or more declarations all specify exactly the same parameters).
>
> There are at least two different things you could reasonably mean:
>
>
>    1. Most likely, you mean that you want to separately describe two or 
>    more different parts of the same file.  In that case you are incorrect
to
>    model the parts as File resources, because they are not whole files. 
There
>    are multiple ways to handle this, but a good one would be via the Concat
>    module, which you can find on the module forge.  It will allow you to
model
>    individual pieces of a file, and to specify how they are to be assembled
to
>    form the whole.
>    2. You could mean that you want to declare separate files whose 
>    contents are based on the same template.  In that case it is correct to
use
>    separate File resources, but you must be declaring them wrongly.  Each
one
>    must have a unique title and a unique absolute filename (path property);
if
>    not specified explicitly, the absolute filename is the same as the
title.
>    There is no inherent need for the resource title or target file name to 
>    have any particular relationship with the template file name (though you
>    will make it easier on yourself if you choose something that helps you 
>    associate them).
>    
>
> Good luck,
>
> John
>
>
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On 04/16/2013 05:39 PM, Rahul Khengare wrote:
> I am not able to change postgresql.conf file twice in postgresql module
> and then pg_statsinfo module in case of db01, it give duplication
> declaration of file resources.
This is important: Puppet does not "change" your files. Puppet
rewrites
the file to have the exact content you specify in your
manifest/template. The content must be rendered exactly once.

You need to build a template that can serve both your use cases. See to
it that db01 sets an appropriate variable. The template should add the
additional content only if this variable is set.

See http://docs.puppetlabs.com/guides/templating.html#conditionals

HTH,
Felix

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