Puppet users - Jun 2009 - exec : creates parameter does not create the file

Hello guys,

I am facing this problem. I have an exec resource which has a create
parameter. The catalog runs properly but the file is not created, has anyone
faced such a problem?
My manifest is

class example
{
      exec { "sources":
              command => "/usr/bin/sudo /usr/bin/gem sources -a
http://gems.github.com",
              creates => "/tmp/githubadded"
      }
}

The command runs fine but it does not create /tmp/githubadded file. I also
have write permission on this directory. Any help would be appreciated.
Thanks!

-- 
Regards,
Swati

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Swati Tiwari wrote:
> The command runs fine but it does not create /tmp/githubadded file.
I think you''re misunderstanding the parameter. The exec resource does 
not create this file. It assumes whatever it is exec''ing will create
the
file. So, it will keep running the exec until this file is created by 
the process being run.

Hope that makes more sense.
Avi

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Swati Tiwari writes:
 > Hello guys,
 > 
 > I am facing this problem. I have an exec resource which has a create
 > parameter. The catalog runs properly but the file is not created, has
anyone
 > faced such a problem?
 > My manifest is
 > 
 > class example
 > {
 >       exec { "sources":
 >               command => "/usr/bin/sudo /usr/bin/gem sources -a
 > http://gems.github.com",
 >               creates => "/tmp/githubadded"
 >       }
 > }
 > 
 > The command runs fine but it does not create /tmp/githubadded file.

Then why do you have ''creates =>
"/tmp/githubadded"'' in your class?  If
the command "/usr/sbin/sudo /usr/bin/gem sources -a
http;//gems.github.com" doesn''t create the file
"/tmp/githubadded", then
Puppet will run the command over and over.

Normally you use "creates" in an "exec" if you want the
"exec" to run if
some specified file or directory doesn''t exist, and the command run by
the "exec" needs to create the file or directory you name with
"creates".

 > I also have write permission on this directory.

Note also that it is common for /tmp to be cleared out every time you
reboot a system, so if you are trying to use this to install software
for later use, this may attempt a reinstall when it is unnecessary to do
so.

 > Any help would be appreciated.  Thanks!

I also have to wonder why you use "sudo" in the command, since the
Puppet client normally runs as root, and if not run as root "sudo"
normally prompts for a password.

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Swati Tiwari wrote:
> The command runs fine but it does not create /tmp/githubadded file. I 
> also have write permission on this directory. Any help would be 
> appreciated. Thanks!
> 
<<
creates

A file that this command creates. If this parameter is provided, then 
the command will only be run if the specified file does not exist:
 >>

This means Puppet uses the file specified in your creates directive to 
determine if it needs to run the command again. Neither `sudo'' nor
`gem''
create the file `/tmp/githubadded'', so it will always execute this Exec
resource.

-scott

-- 
scott@ohlol.net

http://github.com/ohlol

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Got it! Thank you!

I did this and it worked!

exec { "sources":
       command => "sudo gem sources -a http://gems.github.com/ >
/tmp/githubadded",
       creates => "/tmp/githubadded"
}

I hope that''s the right way to do it...

2009/6/26 Scott Smith <scott@ohlol.net>
>
> Swati Tiwari wrote:
> > The command runs fine but it does not create /tmp/githubadded file. I
> > also have write permission on this directory. Any help would be
> > appreciated. Thanks!
> >
>
> <<
> creates
>
> A file that this command creates. If this parameter is provided, then
> the command will only be run if the specified file does not exist:
>  >>
>
> This means Puppet uses the file specified in your creates directive to
> determine if it needs to run the command again. Neither `sudo'' nor
`gem''
> create the file `/tmp/githubadded'', so it will always execute this
Exec
> resource.
>
> -scott
>
> --
> scott@ohlol.net
>
> http://github.com/ohlol
>
> >
>

-- 
Regards,
Swati

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Hi
> exec { "sources":
>        command => "sudo gem sources -a http://gems.github.com/ >
> /tmp/githubadded",
>        creates => "/tmp/githubadded"
> }
> 
> I hope that''s the right way to do it...

I would rather do:

exec { "sources":
        command => "sudo gem sources -a http://gems.github.com/",
	unless => ''gem source -l | grep -q gems.github.com'',
}

which is more idempotent.

/tmp is thought only for temporary files. on the different systems this
file will be missing after a certain amount of time or after a reboot.
hence puppet would rerun the exec again.

cheers pete

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That''s definitely way better than what I was planning on doing, thanks
Peter!

2009/6/27 Peter Meier <peter.meier@immerda.ch>
>
> Hi
>
> > exec { "sources":
> >        command => "sudo gem sources -a http://gems.github.com/
>
> > /tmp/githubadded",
> >        creates => "/tmp/githubadded"
> > }
> >
> > I hope that''s the right way to do it...
>
>
> I would rather do:
>
> exec { "sources":
>        command => "sudo gem sources -a
http://gems.github.com/",
>        unless => ''gem source -l | grep -q
gems.github.com'',
> }
>
> which is more idempotent.
>
> /tmp is thought only for temporary files. on the different systems this
> file will be missing after a certain amount of time or after a reboot.
> hence puppet would rerun the exec again.
>
> cheers pete
>
> >
>

-- 
Regards,
Swati

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On Sat, Jun 27, 2009 at 04:54:44PM +0200, Peter Meier
wrote:
> 
> Hi
> 
> > exec { "sources":
> >        command => "sudo gem sources -a http://gems.github.com/
>
> > /tmp/githubadded",
> >        creates => "/tmp/githubadded"
> > }
> > 
> > I hope that''s the right way to do it...
> 
> 
> I would rather do:
> 
> exec { "sources":
>         command => "sudo gem sources -a
http://gems.github.com/",
> 	unless => ''gem source -l | grep -q gems.github.com'',
> }
> 
> which is more idempotent.
> 
> /tmp is thought only for temporary files. on the different systems this
> file will be missing after a certain amount of time or after a reboot.
> hence puppet would rerun the exec again.
Also, if "gem sources -a" fails, it would not be retried until next
/tmp
cleanup.

-- 
Marcin Owsiany <marcin@owsiany.pl>              http://marcin.owsiany.pl/
GnuPG: 1024D/60F41216  FE67 DA2D 0ACA FC5E 3F75  D6F6 3A0D 8AA0 60F4 1216
 
"Every program in development at MIT expands until it can read mail."
                                                              -- Unknown

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