Use onlyif in EXEC

[Douglas Brancaglion]

Hi guys!

I need configure one command exec with onlyif parameter.

I want test file size exist or no.

Ho i do this?

Tks in advanced.

Douglas

[Tim Sharpe]

Run command if file exists:

exec { 'foo'

  command => '<your command>',

  onlyif => '/usr/bin/test -f /file/that/must/exist/for/exec/to/run',

}

Run command unless file exists

exec {

  command => '<your command>',

  creates => '/path/to/file',

}

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[Doug Chapman]

Checkout the 'creates' property, it seems like a cleaner way of doing this:

http://docs.puppetlabs.com/references/2.6.8/type.html#exec

Douglas

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Doug Chapman

[Douglas Brancaglion]

Tks guys!!

It's ok!

On 03/12/2012 07:52 PM, Doug Chapman wrote:

Checkout the 'creates' property, it seems like a cleaner way of doing this:

http://docs.puppetlabs.com/references/2.6.8/type.html#exec

On Mon, Mar 12, 2012 at 12:23 PM, Douglas Brancaglion <douglas...@gmail.com> wrote:

Hi guys!

I need configure one command exec with onlyif parameter.

I want test file size exist or no.

Ho i do this?

Tks in advanced.

Douglas

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Doug Chapman

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[Trammael]

On Monday, March 12, 2012 5:52:53 PM UTC-5, ed209 wrote:

Checkout the 'creates' property, it seems like a cleaner way of doing this:

http://docs.puppetlabs.com/references/2.6.8/type.html#exec

Pardon the newbie question, but does work on or de-reference symlinks?

Cheers.

[Mohamed Lrhazi]

You might want to rephrase your question, as it is not obvious, at
least not to me.

Mohamed.

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[Eugene Vilensky]

>> On Monday, March 12, 2012 5:52:53 PM UTC-5, ed209 wrote:
>>>
>>> Checkout the 'creates' property, it seems like a cleaner way of doing
>>> this:
>>>
>>> http://docs.puppetlabs.com/references/2.6.8/type.html#exec
>>
>>
>> Pardon the newbie question, but does work on or de-reference symlinks?
>>

On Tue, Mar 13, 2012 at 3:51 PM, Mohamed Lrhazi <lrh...@gmail.com> wrote:
> You might want to rephrase your question, as it is not obvious, at
> least not to me.
>
> Mohamed.

If the "creates" property of a Exec points to a symlink, what is the
effect if the target of the symlink is missing?

Cheers,

[Peter Bukowinski]

The exec will not run in this case. The 'creates' attribute looks for something to exist at the specified path. A symlink, even if broken, is still a file.

These hypotheticals are simple to test out on your own. To test this case on any puppet client, first create a class:

#test.pp:

class test {

    exec { 'touch /opt/test.did.run': creates => '/opt/test.link' }

}

Then create a symlink to a non-existent file:

    ln -s /opt/nada /opt/test.link

Finally:

    puppet apply test.pp

/opt/test.did.run won't be created.

-- 
Peter M. Bukowinski
Sr. Systems Engineer
Janelia Farm Research Campus, HHMI

[Peter Bukowinski]

Apologies, I was completely wrong. Must be something amiss with the above manifest. Even when the target is missing it wasn't running the exec. The following code will run the exec if the target is a broken symlink but will not run it if the target it a valid symlink:

puppet apply -e 'exec { "/bin/touch /opt/exec.did.run": creates => "/opt/test.link" }'

So, again, my former conclusion was incorrect. 'creates' appears to be smart enough to recognize a broken symlink as a missing file.

[jcbollinger]

I don't call that "smart", I call it "buggy". The target of a symlink
is not the symlink itself. Even a broken symlink named in an Exec's
'creates' should be sufficient to prevent that Exec from running. At
best, the documentation is inadequate. I encourage you to file an
issue report.


John

[Peter Bukowinski]

Submitted.

http://projects.puppetlabs.com/issues/13126