Setting idp.home

[Peter Schober]

* Cantor, Scott <cantor.2 at osu.edu> [2020-02-17 14:00]:
> The only way I know of to set it is with a -D system variable on the
> Java command line. If anything else works, then it's by accident.

At least in the thread mentioned by the OP Brent had this to offer:
http://shibboleth.net/pipermail/users/2016-July/030471.html
and Matthew S. provided these examples for (specific to his use-case
of running 2 IDP instances on the same server):
http://shibboleth.net/pipermail/users/2016-July/030507.html

Of course that was almost 4 years ago.

-peter