Puppet users - Nov 2008 - Appending a file to an existing file

Hi,

I have a template file which I would like to append to an existing
file (in this case I wish to add a few lines to /etc/motd). Unless
I''ve missed it, it does not appear that file has an append option. Is
there an easy way copy to the end of a file

Thanks
Paul

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Paul,

Besides "exec" there really isn''t. However, it seems odd to
me that
you wouldn''t just put those initial lines into your template. Why
isn''t that a reasonable solution?

--Paul

On Mon, Nov 10, 2008 at 9:36 AM, paul matthews
<paulsmatthews@googlemail.com> wrote:
>
> Hi,
>
> I have a template file which I would like to append to an existing
> file (in this case I wish to add a few lines to /etc/motd). Unless
> I''ve missed it, it does not appear that file has an append option.
Is
> there an easy way copy to the end of a file
>
> Thanks
> Paul
>
> >
>
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http://reductivelabs.com/trac/puppet/wiki/Recipes/SimpleText may be useful
for you
-Subhasis

2008/11/11 Paul Lathrop <paul@tertiusfamily.net>
>
> Paul,
>
> Besides "exec" there really isn''t. However, it seems odd
to me that
> you wouldn''t just put those initial lines into your template. Why
> isn''t that a reasonable solution?
>
> --Paul
>
> On Mon, Nov 10, 2008 at 9:36 AM, paul matthews
> <paulsmatthews@googlemail.com> wrote:
> >
> > Hi,
> >
> > I have a template file which I would like to append to an existing
> > file (in this case I wish to add a few lines to /etc/motd). Unless
> > I''ve missed it, it does not appear that file has an append
option. Is
> > there an easy way copy to the end of a file
> >
> > Thanks
> > Paul
> >
> > >
> >
>
> >
>

-- 
Subhasis Dasgupta

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Hi Paul,

Thanks for the reply. Our set up here is slightly odd in that I need to run
a security tool which creates motd and then the puppet part adds a few more
lines with some extra variables. This is my first post to the group btw so
thanks for the reply. Being relatively new to puppet it so far seems a great
tool but does seem to be lacking a bit with file manipulation resources. I
did have a look at augeas but it seemed overly complex for what I was trying
to achieve. I''ll use ''exec'' as you suggested

Thanks
Paul



2008/11/11 Paul Lathrop <paul@tertiusfamily.net>
>
> Paul,
>
> Besides "exec" there really isn''t. However, it seems odd
to me that
> you wouldn''t just put those initial lines into your template. Why
> isn''t that a reasonable solution?
>
> --Paul
>
> On Mon, Nov 10, 2008 at 9:36 AM, paul matthews
> <paulsmatthews@googlemail.com> wrote:
> >
> > Hi,
> >
> > I have a template file which I would like to append to an existing
> > file (in this case I wish to add a few lines to /etc/motd). Unless
> > I''ve missed it, it does not appear that file has an append
option. Is
> > there an easy way copy to the end of a file
> >
> > Thanks
> > Paul
> >
> > >
> >
>
> >
>
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paul matthews wrote:
> Thanks for the reply. Our set up here is slightly odd in that I need to run
> a security tool which creates motd and then the puppet part adds a few more
> lines with some extra variables.
Alternatively to exec, you could:

1) let the security tool fix the motd once

2) copy it to the puppetmaster and convert it into a template with your 
extra lines

3) change your puppet manifests to only deploy the new motd template if 
there''s evidence the security script has run. Something like:

   file { "/etc/motd":
     content => template("motd.erb"),
     onlyif  => "test -f /path/to/evidence_log"
   }

would be simple, integrating your security tool into your puppet 
manifests would be another way.

-- 
Mike Renfro  / R&D Engineer, Center for Manufacturing Research,
931 372-3601 / Tennessee Technological University -- renfro@tntech.edu

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Hi Mike,

I think I''ll try your option 2 as option 3 would mean over-writing the
dynamic data in motd that the security tool has added
Thanks for your help

Rgds
Paul

2008/11/11 Mike Renfro <renfro@tntech.edu>
>
> paul matthews wrote:
>
> > Thanks for the reply. Our set up here is slightly odd in that I need
to
> run
> > a security tool which creates motd and then the puppet part adds a few
> more
> > lines with some extra variables.
>
> Alternatively to exec, you could:
>
> 1) let the security tool fix the motd once
>
> 2) copy it to the puppetmaster and convert it into a template with your
> extra lines
>
> 3) change your puppet manifests to only deploy the new motd template if
> there''s evidence the security script has run. Something like:
>
>   file { "/etc/motd":
>     content => template("motd.erb"),
>     onlyif  => "test -f /path/to/evidence_log"
>   }
>
> would be simple, integrating your security tool into your puppet
> manifests would be another way.
>
> --
> Mike Renfro  / R&D Engineer, Center for Manufacturing Research,
> 931 372-3601 / Tennessee Technological University -- renfro@tntech.edu
>
> >
>
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paul matthews wrote:
> I think I''ll try your option 2 as option 3 would mean over-writing
the
> dynamic data in motd that the security tool has added
Those were three steps for a single option. The template applied in step 
3 would *be* the template you mark up in step 2, but would only get 
applied if and only if you found a particular log file or trace that 
indicated your security tool (JASS or whatever) had run.

-- 
Mike Renfro  / R&D Engineer, Center for Manufacturing Research,
931 372-3601 / Tennessee Technological University -- renfro@tntech.edu

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>
> 1) let the security tool fix the motd once
>
> 2) copy it to the puppetmaster and convert it into a template with your
> extra lines
>
> 3) change your puppet manifests to only deploy the new motd template if
> there''s evidence the security script has run. Something like:
>
>   file { "/etc/motd":
>     content => template("motd.erb"),
>     onlyif  => "test -f /path/to/evidence_log"
>   }
>
> would be simple, integrating your security tool into your puppet
> manifests would be another way.
>
I don''t believe this will work as the onlyif attribute is only
available for the exec type. But something similiar using the generate
function might work.

file { "/etc/motd":
     content =>generate (<script that runs the security tool server
side then cats on the extra lines>) ,
   }

Of course the security tool may not work as a server side run, but
this might give you an idea to work with.

Evan

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On 11/12/2008 9:28 AM, Evan Hisey wrote:
> I don''t believe this will work as the onlyif attribute is only
> available for the exec type. But something similiar using the generate
> function might work.
Could have sworn I saw onlyif in the metaparameters list, but I 
obviously didn''t. So if you could integrate the security tool into 
puppet itself, then you could have:

- a file entry that contains the extra lines for the motd

- an exec entry that runs the security tool

- an exec entry that looks for evidence the security tool has run, and 
then adds the extra lines onto the motd

-- 
Mike Renfro  / R&D Engineer, Center for Manufacturing Research,
931 372-3601 / Tennessee Technological University

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Mike,
I''ll give that a go. Thanks very much for all your answers
Cheers
Paul

2008/11/12 Mike Renfro <renfro@tntech.edu>
>
> On 11/12/2008 9:28 AM, Evan Hisey wrote:
>
> > I don''t believe this will work as the onlyif attribute is
only
> > available for the exec type. But something similiar using the generate
> > function might work.
>
> Could have sworn I saw onlyif in the metaparameters list, but I
> obviously didn''t. So if you could integrate the security tool into
> puppet itself, then you could have:
>
> - a file entry that contains the extra lines for the motd
>
> - an exec entry that runs the security tool
>
> - an exec entry that looks for evidence the security tool has run, and
> then adds the extra lines onto the motd
>
> --
> Mike Renfro  / R&D Engineer, Center for Manufacturing Research,
> 931 372-3601 / Tennessee Technological University
>
> >
>
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Hi Paul,

In that case, use a template. Templates are just ERB, so you can run
your security tool from within the template to get the header part of
the file.

--Paul

On Tue, Nov 11, 2008 at 2:41 AM, paul matthews
<paulsmatthews@googlemail.com> wrote:
> Hi Paul,
>
> Thanks for the reply. Our set up here is slightly odd in that I need to run
> a security tool which creates motd and then the puppet part adds a few more
> lines with some extra variables. This is my first post to the group btw so
> thanks for the reply. Being relatively new to puppet it so far seems a
great
> tool but does seem to be lacking a bit with file manipulation resources. I
> did have a look at augeas but it seemed overly complex for what I was
trying
> to achieve. I''ll use ''exec'' as you suggested
>
> Thanks
> Paul
>
>
>
> 2008/11/11 Paul Lathrop <paul@tertiusfamily.net>
>>
>> Paul,
>>
>> Besides "exec" there really isn''t. However, it seems
odd to me that
>> you wouldn''t just put those initial lines into your template.
Why
>> isn''t that a reasonable solution?
>>
>> --Paul
>>
>> On Mon, Nov 10, 2008 at 9:36 AM, paul matthews
>> <paulsmatthews@googlemail.com> wrote:
>> >
>> > Hi,
>> >
>> > I have a template file which I would like to append to an existing
>> > file (in this case I wish to add a few lines to /etc/motd). Unless
>> > I''ve missed it, it does not appear that file has an
append option. Is
>> > there an easy way copy to the end of a file
>> >
>> > Thanks
>> > Paul
>> >
>> > >
>> >
>>
>>
>
>
> >
>
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