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Re: [libvirt] patch option needs clarification



On 10/22/2012 03:59 PM, Gene Czarcinski wrote:
On 10/22/2012 03:17 PM, Laine Stump wrote:
On 10/22/2012 09:26 AM, Gene Czarcinski wrote:
I am pretty much complete creating a patch which changes how dnsmasq
is started by moving the command line parameters into a conf file.
This new file is placed into the same directory and the lease file.

The test for the command line arguments now checks the contents of the
conf-file and there is no longer any tests for the command line
parameters which are now two.
This will also change the requirements of whether or not a dnsmasq
restart or "refresh" (SIGHUP) is required when certain pieces of the
network definition are changed with virNetworkUpdate(), but that can be
submitted as a separate patch. (basically, things that used to require a
change on the commandline, but now only require a change in the conf
file, will no longer require a restart).
SIGHUP will not do it ... I check into it. By design, configuration files are not revisited once started. Some other files are but not the configuration files. It will take a restart whether is is on the command line or in a conf-file. I believe I understand why it is done this way ... just too much could change ... better to start off clean with a restart (that is from the dnsmasq perspective).


The first command line parameter is (naturally) --conf-file=<filename>.

The second parameter adds new functionality and is
--conf-dir=<directory>.  This directory is placed into the same
directory as the conf-file and the lease file.  The name of this
directory is "<net-name>.d". This was added to make testing/debugging
of new dnsmasq options easier since it no longer requires rebuilding
the binaries.  This is also useful for adding log-dhcp and/or
log-queries for a specific network.

Now the option question.  I can submit the patch assuming the my
previously submitted patch to add --interface to the command line has
been applied or I can assume that it has not been applied.  In either
case, the new code adds a interface=<dev-name> to the conf-file.
Submit it assuming that the patch *has* been applied. I think we do need
to make that change (adding "--interface"), but it needs to be
explicitly visible in a separate patch (and we need to do some testing
before pushing it).
Oops. But then I am not sure how to do it. The new code changes "everything."

If you want, I can go back and remove it ... make yet-another-patch on top of the one one to way to the list which removes interface= from the conf-file and then submit a third patch which puts it back in.

I am not sure I understand the reluctance about putting the --interface patch in. This problem exists in using any dnsmasq => 2.61. I believe I have seen it happen although I did not realize it at the time. Simon says that there is logging of the event in dnsmasq's rfc3315.c but I have not gone back to prove that the problem exists if --interface is not specified. I am not talking about adding this to older versions of libvirt ... just the current one and the version that is on Fedora 17 since dnsmasq was so quickly updated to 2.63.

OK, over to you ... what do you want me to do?

I just noticed something "strange" about the patch I submitted. Wait a bit while I look into what is going on.

Gene


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