How to check a text file for a certain line?

[Dan Pasacrita]

Hi everyone, I'm pretty new to puppet, and I was wondering if you guys to help me with something pretty basic. I'm attempting to write a module that will check a text file for a certain line of text, and if it doesn't find it, to add a that content in a new line.

I'm pretty sure I can add the new line using exec to run echo "content" >> file.txt, but checking the file for said content has me completely stumped. What can I do here?

[Kenton Brede]

Look into using "file_line," it's part of stdlib.

https://forge.puppetlabs.com/puppetlabs/stdlib

If you want to check for an existing line, using an "exec" you can use "onlyif" or "unless."

Something like:

unless => "grep myline /path/to/file",

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

Kent

On Mon, Apr 21, 2014 at 10:18 AM, Dan Pasacrita <whitew...@gmail.com> wrote:

Hi everyone, I'm pretty new to puppet, and I was wondering if you guys to help me with something pretty basic. I'm attempting to write a module that will check a text file for a certain line of text, and if it doesn't find it, to add a that content in a new line.

I'm pretty sure I can add the new line using exec to run echo "content" >> file.txt, but checking the file for said content has me completely stumped. What can I do here?

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Kent Brede

[Steven Kurylo]

On Mon, Apr 21, 2014 at 8:18 AM, Dan Pasacrita <whitew...@gmail.com> wrote:

Hi everyone, I'm pretty new to puppet, and I was wondering if you guys to help me with something pretty basic. I'm attempting to write a module that will check a text file for a certain line of text, and if it doesn't find it, to add a that content in a new line.

 

You want to use "unless" in your exec
http://docs.puppetlabs.com/references/latest/type.html#exec

Here are some example of what you're trying to accomplish:

http://projects.puppetlabs.com/projects/puppet/wiki/Simple_Text_Patterns/5

exec { "/bin/echo '${line}' >> '${file}'":
                unless => "/bin/grep -qFx '${line}' '${file}'"
            }

--

Steven Kuryło

[Joachim Schrod]

On 04/21/14 19:42, Kenton Brede wrote:
> Look into using "file_line," it's part of stdlib.
>
> https://forge.puppetlabs.com/puppetlabs/stdlib

Hmm, I don't detect any documentation of file_line at that URL.

Could you post another link with documentation?

Thanks,
Joachim

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Joachim Schrod, Roedermark, Germany
Email: jsc...@acm.org

[Andreas Ntaflos]

On 2014-04-22 00:10, Joachim Schrod wrote:
> On 04/21/14 19:42, Kenton Brede wrote:
>> Look into using "file_line," it's part of stdlib.
>>
>> https://forge.puppetlabs.com/puppetlabs/stdlib
>
> Hmm, I don't detect any documentation of file_line at that URL.
>
> Could you post another link with documentation?

Funny that it doesn't seem to be mentioned in the README anymore, but
here is the code and the documentation:

https://github.com/puppetlabs/puppetlabs-stdlib/blob/master/lib/puppet/type/file_line.rb

Andreas

[Kenton Brede]

Click on the "types" tab on that page and you'll see the documentation for "file_line."

Kent

--

Kent Brede

[Joachim Schrod]

On 04/22/14 01:41, Kenton Brede wrote:
> On Mon, Apr 21, 2014 at 5:53 PM, Andreas Ntaflos
> <da...@pseudoterminal.org <mailto:da...@pseudoterminal.org>> wrote:
>
> On 2014-04-22 00:10, Joachim Schrod wrote:
> > On 04/21/14 19:42, Kenton Brede wrote:
> >> Look into using "file_line," it's part of stdlib.
> >>
> >> https://forge.puppetlabs.com/puppetlabs/stdlib
> >
> > Hmm, I don't detect any documentation of file_line at that URL.
> >
> > Could you post another link with documentation?
>
> Funny that it doesn't seem to be mentioned in the README
> anymore, but
> here is the code and the documentation:
>
> https://github.com/puppetlabs/puppetlabs-stdlib/blob/master/lib/puppet/type/file_line.rb
>

> Click on the "types" tab on that page and you'll see the
> documentation for "file_line."

Thanks to both of you for that pointers; I'm still new to puppet
and need to find my way around.