ceph/ceph — pull request #1046 by dachary (2014-01-05 15:04:41+00:00)
Title: common: recursive implementation of config::expand_meta …

Using a recursive implementation of variable expansions make it easier
to protect against loops and provide human readable messages when they
happen.

It also enables one variable to be substituted multiple times in the
same configuration option instead of just once because it is confused
with a variable expansion loop.