Re: mpf_update_policy_bundle: can this be a list?

Also, there was this blog post about writing a custom update cfbs
module: https://cfengine.com/blog/2022/example-custom-policy-update-cfbs-module/

It might also contain some useful information.


"'Nick Anderson' via help-cfengine" <[email protected]> writes:

>  Is it a design feature that "mpf_update_policy_bundle" can only specify a single bundle? Or perhaps a bug?
>
>  (I can probably do a work-around of a single, higher-level bundle which itself then calls both my intended real bundles. But still…)
>
> It's by design that it's a single bundle.
>
> You can find the policy in cfe_internal/update/update_policy.cf.
>
> It looks to see if the specified bundle is found and then runs it.
>
> It becomes an slist because you defined it as a list/array. If defined as a list/array I expect that only the last defined bundle will get run because when it looks to make sure
> the specified bundle exists it uses bundlesmatching() taking the value of def.mpf_update_policy_bundle as the bundle to search for.
>
> # Look for a bundle that matches what the user wants
> "found_matching_user_specified_bundle"
>   slist => bundlesmatching( "$(def.mpf_update_policy_bundle)" );
>
> If def.mpf_update_policy_bundle is a list, then the value of found_matching_user_specified_bundle will be the result of bundlesmatching() against the last
> iterated element.
>
> If you want to run multiple bundles for the policy update then you should define just a single bundle which calls the others as methods promises.
>
> If you want to run other bundles as part of the update policy (not specific to policy update) see def.control_common_update_bundlesequence_end.
>
> If you think this should be more explicit, perhaps open a PR to add some additional note to the MPF docs or instrument the policy so that it emits reports if
> def.mpf_update_policy_bundle is not a string ( see type(), introduced in 3.18.0 ), or perhaps based on length


--
Nick Anderson | Doer of Things | (+1) 785-550-1767 | https://northern.tech

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