Re: [gentoo-portage-dev] [PATCH v2] AbstractEbuildProcess: disable ipc_daemon under Windows Subsystem for Linux

[Zac Medico]

On Thu, Sep 22, 2016 at 8:48 PM, Zac Medico <zmedico@g.o> wrote:
> On Thu, Sep 22, 2016 at 8:23 PM, Kerin Millar <kfm@×××××××××.net> wrote:
>> Duly updated to use any instead of ==, as recommended by Brian Dolbec.
>>
>> --
>> Kerin Millar <kfm@×××××××××.net>
>
> My first choice would be to use a small test case to detect when ipc
> is broken, and disable it dynamically. A good example of such a test
> is the can_poll_device function here:
>
> https://gitweb.gentoo.org/proj/portage.git/tree/pym/portage/util/_eventloop/EventLoop.py?h=portage-2.3.1#n597
>
> If it's not possible to use a test similar to the above, maybe it's
> best to use /proc/version or /proc/sys/kernel/osrelease as mentioned
> in the following issue:
>
> https://github.com/Microsoft/BashOnWindows/issues/423
>
> Thanks,
> Zac

I've started playing around with WSL, and I've discovered that
portage's ipc actually works if we use fcntl.flock instead of
fcntl.lockf!!! Simply set _default_lock_fn = fcntl.flock in
pym/portage/locks.py, and watch the tests succeed:

$ pym/portage/tests/runTests.py pym/portage/tests/ebuild/test_ipc_daemon.py
testIpcDaemon (portage.tests.ebuild.test_ipc_daemon.IpcDaemonTestCase) ... ok

----------------------------------------------------------------------
Ran 1 test in 1.282s

OK

So, I'm thinking that we should add a dynamic test inside
pym/portage/locks.py which checks for a broken fcntl.lockf, and falls
back to fcntl.flock in that case.

Thanks,
Zac