[RFC] inconsistent between '<listen>' and '--address' of message bus

[Yang Chengwei]

Hi List,

I just found that there is an inconsistent issue of message bus server
address.

There are two ways to specify the message bus server addresses, from
command line option "--address" or configure "<listen>" element in bus
config file.

However, they behave a little different as below.

Quote from DBus Spec

 [FIXME clarify if attempting to connect to each is a requirement or
 just a suggestion] When connecting to a server, multiple server
 addresses can be separated by a semi-colon. The library will then try
 to connect to the first address and if that fails, it'll try to connect
 to the next one specified, and so forth. For example

 unix:path=/tmp/dbus-test;unix:path=/tmp/dbus-test2

Quote from dbus-daemon(1)

 ·   <listen>

     Add an address that the bus should listen on. The address
	 is in the standard D-Bus format that contains a transport
	 name plus possible parameters/options.

	 Example: <listen>unix:path=/tmp/foo</listen>

	 Example: <listen>tcp:host=localhost,port=1234</listen>

	 If there are multiple <listen> elements, then the bus listens
	 on multiple addresses. The bus will pass its address to
	 started services or other interested parties with
	 the last address given in <listen> first. That
	 is, apps will try to connect to the last <listen>
	 address first.

So seems that we're saying: there is no way to listen on multiple
address if you're using '--address' option, if that is your case,
configure '<listen>' in config file instead.

Should this to be fixed?

If so, how? Align '<listen>(man page)' with '--address(dbus spec)' or
the reverse?

--
Thanks,
Chengwei
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