tree c235a291d8e905a8e05f1a09effd5238ba869de1
parent 0f19c87276e46b56edbae70a71749353d401ed39
author Patrick Williams <patrick@stwcx.xyz> 1594414947 -0500
committer Patrick Williams <patrick@stwcx.xyz> 1594817734 -0500

sdbus++: support 'readonly' flag

The previous documentation of 'const' did not match the
specification at a D-Bus level nor the implementation in sdbus++.
Correct the documentation for 'const' and add a new 'readonly' flag
which enables the previously documented behavior for 'const.

This was reported by a user outside of the openbmc project which had
already been using the 'readonly' flag in their YAML to identify this
condition.  Previously, sdbus++ silently ignored flags it didn't
explicitly support but as of 20255a5fce55a0743dc3d307d1168f18ed553751
this turned into an error.

There are cases of interfaces in 'phosphor-dbus-interfaces' currently
using 'const' where they likely desire a 'readonly' instead.  We are
not changing the behavior of 'const' with this commit, so there would
be no regressions induced by this code change.

Resolves openbmc/sdbusplus#48.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I690cb424f5fd00da190343a345ae57ccae393041