Puppet users - Apr 2009 - Notifications between definitions

I''ve been using ''define'' to make a few custom types.
For example, I have a
simple ''file'' like thing (s3::file) that downloads a file from
S3, only if the
one on the local machine doesn''t match, and it can send out
notifications if
the file changed. This is basically an exec command that uses some scripts I 
wrote in an ''onlyif'' to see if the MD5s don''t match.

I also have another one that can deploy or undeploy an application in 
Glassfish (a Java application server) from a source file. This too is mostly 
an exec that checks to see if the application is already defined in GF, and if 
not, installs it from the source file you give it[0]. Or, alternately, removes 
it if it is defined and ensure => absent was given.

What I''d like to be able to do is have a fairly clean way of sending a 
notification that says the file has changed (that is already possible), and 
have the deploy bit know that when it gets that, it should undeploy and then 
redeploy the application.

How would I do this, assuming it''s possible?

Thanks.

[0] An aside: is there a nice way to test the existence of a file so I can 
have it fail with a message if the file doesn''t exist? Just for
robustness''s
sake.

-- 
Robin <robin@kallisti.net.nz> JabberID:
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On Apr 11, 2009, at 5:16 AM, Robin Sheat wrote:
> I''ve been using ''define'' to make a few custom
types. For example, I
> have a
> simple ''file'' like thing (s3::file) that downloads a file
from S3,
> only if the
> one on the local machine doesn''t match, and it can send out  
> notifications if
> the file changed. This is basically an exec command that uses some  
> scripts I
> wrote in an ''onlyif'' to see if the MD5s don''t
match.
>
> I also have another one that can deploy or undeploy an application in
> Glassfish (a Java application server) from a source file. This too  
> is mostly
> an exec that checks to see if the application is already defined in  
> GF, and if
> not, installs it from the source file you give it[0]. Or,  
> alternately, removes
> it if it is defined and ensure => absent was given.
>
> What I''d like to be able to do is have a fairly clean way of
sending a
> notification that says the file has changed (that is already  
> possible), and
> have the deploy bit know that when it gets that, it should undeploy  
> and then
> redeploy the application.
>
> How would I do this, assuming it''s possible?
You can set up relationships with defines like any other resource, so  
this should be as easy as any other notification.
>
> Thanks.
>
> [0] An aside: is there a nice way to test the existence of a file so  
> I can
> have it fail with a message if the file doesn''t exist? Just for  
> robustness''s
> sake.

On the client side?  The only way I can think of doing this right now  
is with an exec.

-- 
Wear the old coat and buy the new book. -- Austin Phelps
---------------------------------------------------------------------
Luke Kanies | http://reductivelabs.com | http://madstop.com


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