its here https://gist.github.com/4254683 - I had a recipe to install a
package X on a node which already had that package, and also in my recipe I
provided a source which did not exist. The recipe failed saying that the
requirements were not met, however I wouldn’t want to fail because the
running the action would cause no change as package is already installed
(idenpotency)
On Mon, Dec 10, 2012 at 11:08 PM, Daniel DeLeo dan@kallistec.com wrote:
On Sunday, December 9, 2012 at 10:25 PM, Kishore S Kumar wrote:
Hi,
I’m trying to understand how resource requirements work with idempotent
resource. Can someone help me. Currently I have a idempotent resource which
say install a software unless it is already installed. I have resource
requirement assertion set for the action which fail if the installer does
not exist.
What should have happened when I try to run the recipe on a node where
the software is already installed(idempotency) and the installer does not
exist(resource requirements failed).
right now the recipe fails saying the resource requirements failure.
Thanks
Kishore
Full explanation of what resource requirements are and do here:
https://github.com/opscode/chef/blob/master/lib/chef/mixin/why_run.rb#L63-123
Short version is that they are for implementing why-run’s precondition
detection and assumption behavior. The canonical example is the case where
you have a service that’s not installed yet. Since chef can’t query the
init script to see if the service is running, it can’t give any realistic
information about whether a service would be started, so it emits a warning
and then proceeds assuming the action would have been run.
–
Daniel DeLeo
