[ClusterLabs] Antw: Re: Q: Recommened directory for RA auxillary files?

[Ulrich Windl]

>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 04.09.2019 um 16:26 in
Nachricht
<2634f19382b90736bdfb80b9c84997111479d337.camel at redhat.com>:
> On Wed, 2019‑09‑04 at 10:07 +0200, Jehan‑Guillaume de Rorthais wrote:
>> On Tue, 03 Sep 2019 09:35:39 ‑0500
>> Ken Gaillot <kgaillot at redhat.com> wrote:
>> 
>> > On Mon, 2019‑09‑02 at 15:23 +0200, Ulrich Windl wrote:
>> > > Hi!
>> > > 
>> > > Are there any recommendations where to place (fixed content)
>> > > files an
>> > > RA uses?
>> > > Usually my RAs use a separate XML file for the metadata, just to
>> > > allow editing it in XML mode automatically.
>> > > Traditionally I put the file in the same directory as the RA
>> > > itself
>> > > (like "cat $0.xml" for meta‑data).
>> > > Are there any expectations that every file in the RA directory is
>> > > an
>> > > RA?
>> > > (Currently I'm extending an RA, and I'd like to provide some
>> > > additional user‑modifiable template file, and I wonder which path
>> > > to
>> > > use)
>> > > 
>> > > Regards,
>> > > Ulrich  
>> > 
>> > I believe most (maybe even all modern?) deployments have both lib
>> > and
>> > resource.d under /usr/lib/ocf. If you have a custom provider for
>> > the RA
>> > under resource.d, it would make sense to use the same pattern under
>> > lib.
>> 
>> Shouldn't it be $OCF_FUNCTIONS_DIR?
> 
> Good point ‑‑ if the RA is using ocf‑shellfuncs, yes. $OCF_ROOT/lib
> should be safe if the RA doesn't use ocf‑shellfuncs.
> 
> It's a weird situation; the OCF standard actually specifies /usr/ocf,
> but everyone implemented /usr/lib/ocf. I do plan to add a configure
> option for it in pacemaker, but it shouldn't be changed unless you can
> make the same change in every other cluster component that needs it.

The thing with $OCF_ROOT is: If $OCF_ROOT already contains "/lib", it looks
off to add another "/lib".
To me it looks as if it's time for an $OCF_LIB (which would be $OCF_ROOT if
the latter is /usr/lib/ocf already, otherwise $OCF_ROOT/lib). Personally I
think the /usr/<something> predates the [/usr][/share]]/lib/<something>.

> 
>> Could this be generalized to RA for their
>> own lib or permanent dependencies files?
> 
> The OCF standard specifies only the resource.d subdirectory, and
> doesn't comment on adding others. lib/heartbeat is a common choice for
> the resource‑agents package shell includes (an older approach was to
> put them as dot files in resource.d/heartbeat, and there are often
> symlinks at those locations for backward compatibility).
> 
> Since "heartbeat" is a resource agent provider name, and the standard
> specifies that agents go under resource.d/<provider‑name>, it does make
> sense that lib/<provider‑name> would be where RA files would go.

I wonder when we will be able to retire "heartbeat" ;-) If it's supposed to be
of "vendor" type, maybe replace it with "clusterlabs" at some time...

Regards,
Ulrich

> ‑‑ 
> Ken Gaillot <kgaillot at redhat.com>
> 
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