Puppet users - Jul 2013 - Importing environmental variables from file via exec

Hi Puppet Community,

I prepare manifests and modules to deploy stuff that I need on agent. 
During building postgres database I have to export some environmental UNIX 
variables stored in "some_file.conf".
Standard procedure to do this is simply run command:

root@hostname:/path_to_config_file# . some_file.conf
>
and after this I see all exported variables ("env" command in
terminal).

Now when I trying do the same thing in puppet exec but variables wont 
export (no error feedback from agent on debug mode).
Puppet code:

        exec {"enviroments":
>                 command => ''/bin/sh -c ".
some_file.conf"'',
>                 path => ["/bin",
"/usr/bin","/path_to_config_file"],
>                 cwd => "/path_to_config_file",
>                 refreshonly => false,
>                 require =>
File["/path_to_config_file/some_file.conf"],
>         }
>
Puppet version: 3.1.1
Distributor ID:    Debian
Description:    Debian GNU/Linux 6.0.7 (squeeze)
Release:    6.0.7
Codename:    squeeze

I will be very grateful for any help, clues or tips that lead me to resolve 
this problem.
P.S
Sorry for my grammar and poor English.

Best Regards

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On Wednesday, July 17, 2013 2:56:34 AM UTC-5, Przemek
wrote:
>
> Hi Puppet Community,
>
> I prepare manifests and modules to deploy stuff that I need on agent. 
> During building postgres database I have to export some environmental UNIX 
> variables stored in "some_file.conf".
> Standard procedure to do this is simply run command:
>
> root@hostname:/path_to_config_file# . some_file.conf
>>
>
> and after this I see all exported variables ("env" command in
terminal).
>
> Now when I trying do the same thing in puppet exec but variables wont 
> export (no error feedback from agent on debug mode).
> Puppet code:
>
>         exec {"enviroments":
>>                 command => ''/bin/sh -c ".
some_file.conf"'',
>>                 path => ["/bin",
"/usr/bin","/path_to_config_file"],
>>                 cwd => "/path_to_config_file",
>>                 refreshonly => false,
>>                 require =>
File["/path_to_config_file/some_file.conf"],
>>         }
>>
>
>
You seem to have a misconception about the scope of environment variables.  
Every process has its own, independent environment.  When one process 
spawns another, the child''s environment is initialized with copies of
those
parent-process environment variables that are marked for export, but once a 
process has started, no changes to another process''s (even its
parent''s or
child''s) environment has any effect on its own environment.

In your case, when that Exec is applied, it launches /bin/sh (presumably a 
Bourne-compatible shell such as bash), instructing it to execute the 
commands it finds in some_file.conf.  In particular, environment variable 
assignments in that file are executed, modifying the environment *of that 
shell process*.  If those environment variables are marked for export, then 
processes subsequently launched *by that shell* will receive copies of 
those variables in their environments, too.  None of that can have any 
effect on processes launched outside the scope of that Exec''s shell 
process, including the puppet agent''s own top-level process or any
other
process launched by it.  Everything runs successfully and correctly;
it''s
just not a useful thing to do.

 
> Puppet version: 3.1.1
> Distributor ID:    Debian
> Description:    Debian GNU/Linux 6.0.7 (squeeze)
> Release:    6.0.7
> Codename:    squeeze
>
> I will be very grateful for any help, clues or tips that lead me to 
> resolve this problem.


If the original idea was to subsequently apply additional Execs that rely 
on the environment you are trying to initialize, then the solution is to 
wrap it all up into a single Exec.  You can do that by writing a wrapper 
script around the whole thing, using a File resource to ensure it present 
on the target node, then Execing that, or if it''s simple enough then
you
can do that directly via a more clueful Exec.  For example,

exec { ''pg_setup'':
    command => ''. some_file.conf && do_step_1 &&
do_step_2'',
    path => [''/bin'', ''/usr/bin'',
''/sbin'', ''/usr/sbin'',
''/path/to/setup_scripts'' ],
    cwd => ''/path/to/config_file'',
    require => File[''/path/to/config_file/some_file.conf''],
    provider => ''shell''
}


John

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John, Thank You for excellent explanation!
Wrapping it all up into a single Exec works. Moreover now I understand how 
to puppet execute shell commands. 
Wrapping is now only way to deploy postgresql database in my environment.

Best Regards 

W dniu środa, 17 lipca 2013 09:56:34 UTC+2 użytkownik Przemek
napisał:
>
> Hi Puppet Community,
>
> I prepare manifests and modules to deploy stuff that I need on agent. 
> During building postgres database I have to export some environmental UNIX 
> variables stored in "some_file.conf".
> Standard procedure to do this is simply run command:
>
> root@hostname:/path_to_config_file# . some_file.conf
>>
>
> and after this I see all exported variables ("env" command in
terminal).
>
> Now when I trying do the same thing in puppet exec but variables wont 
> export (no error feedback from agent on debug mode).
> Puppet code:
>
>         exec {"enviroments":
>>                 command => ''/bin/sh -c ".
some_file.conf"'',
>>                 path => ["/bin",
"/usr/bin","/path_to_config_file"],
>>                 cwd => "/path_to_config_file",
>>                 refreshonly => false,
>>                 require =>
File["/path_to_config_file/some_file.conf"],
>>         }
>>
>
> Puppet version: 3.1.1
> Distributor ID:    Debian
> Description:    Debian GNU/Linux 6.0.7 (squeeze)
> Release:    6.0.7
> Codename:    squeeze
>
> I will be very grateful for any help, clues or tips that lead me to 
> resolve this problem.
> P.S
> Sorry for my grammar and poor English.
>
> Best Regards
>
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