I have written a charm for OpenStack Gnocchi.
The service requires a postgresql database relation.
The start hook fails, of course, because the relation is not set.
I expected that, but I expected that when I issue
juju add-relation gnocchi postgresql:db
it will invoke the database-relation-joined hook, which does set the required
parameter and then start would work.
However the hook is not invoked: as a sanity check I set a juju-log message in
it and it does not run at all.
Is it correct to assume that add-relation will always trigger
database-relation-join?
A second question, I would like to avoid to start the service until the
relation has been joined.
What is the best way to test for the relation to be present?
I tried with
db=`relation-get -r database host`
but it fails with:
INFO start error: invalid value "database" for flag -r: invalid
relation id
I am using juju-2.1.2
Thanks for the help.
— Beppe Attardi
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