Hi Andy, let me clarify my position on DBus. The following components
are easily installed on the latest Debian/Ubuntu system: dbus, libdbus,
libdbus-glib as well as libnl 3. Their presence is not a problem in my
environment.
The run-time configuration is another matter as I would like to run
user-mode LIO backends inside containers. This means limiting/removing
the system interactions as much as possible. Ideally, the backend would
implement both device discovery/configuration as well as data
processing. This gives me the freedom to implement the event loop(s) and
handle I/O from a device(s) in whatever way I see fit. The user-mode
process would only rely on the kernel facilities (well, as well as the
packaged shared libs) and the TCMU plugin configuration would be fixed.
How about a compromise - DBus API is always available, yet only used
when it is meaningful. That is when the handlers are loaded on the fly
into tcmu-runner. I.e. there would static and dynamic ways to configure
handlers and devices.
Oleg.
On 2015-11-24 14:08, Andy Grover wrote:
Hi Oleg and everyone,
I've been working on moving TCMU handling into a library so existing
apps can integrate TCMU processing into their event loops.
In the case where you *don't* need to run the event loop, the existing
support for tcmu-runner handler plugins is unchanged.
https://github.com/agrover/tcmu-runner/pull/16
One remaining TBD is the work to enable tcmu-runner/libtcmu to enable
unified discovery of available handlers. This is partly because I
haven't gotten to it yet :) but also because Oleg expressed a
reluctance to accept a dependency on a DBus library, which is needed
for unified discovery.
Maybe a move to sd-bus instead of GDBus would make it more palatable?
In any case, I think we need to have that discussion before it makes
sense to work on unified discovery.
Thoughts?
Regards -- Andy
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