Re: [PATCH v3 2/2] iotests: test NBD+TLS+iothread

[Kevin Wolf <kwolf@redhat.com>]

Am 03.06.2024 um 13:45 hat Daniel P. Berrangé geschrieben:
> On Fri, May 31, 2024 at 01:04:59PM -0500, Eric Blake wrote:
> > Prevent regressions when using NBD with TLS in the presence of
> > iothreads, adding coverage the fix to qio channels made in the
> > previous patch.
> > 
> > The shell function pick_unused_port() was copied from
> > nbdkit.git/tests/functions.sh.in, where it had all authors from Red
> > Hat, agreeing to the resulting relicensing from 2-clause BSD to GPLv2.
> > 
> > CC: qemu-stable@nongnu.org
> > CC: "Richard W.M. Jones" <rjones@redhat.com>
> > Signed-off-by: Eric Blake <eblake@redhat.com>
> > ---
> >  tests/qemu-iotests/tests/nbd-tls-iothread     | 168 ++++++++++++++++++
> >  tests/qemu-iotests/tests/nbd-tls-iothread.out |  54 ++++++
> >  2 files changed, 222 insertions(+)
> >  create mode 100755 tests/qemu-iotests/tests/nbd-tls-iothread
> >  create mode 100644 tests/qemu-iotests/tests/nbd-tls-iothread.out
> 
> 
> 
> > +# pick_unused_port
> > +#
> > +# Picks and returns an "unused" port, setting the global variable
> > +# $port.
> > +#
> > +# This is inherently racy, but we need it because qemu does not currently
> > +# permit NBD+TLS over a Unix domain socket
> > +pick_unused_port ()
> > +{
> > +    if ! (ss --version) >/dev/null 2>&1; then
> > +        _notrun "ss utility required, skipped this test"
> > +    fi
> > +
> > +    # Start at a random port to make it less likely that two parallel
> > +    # tests will conflict.
> > +    port=$(( 50000 + (RANDOM%15000) ))
> > +    while ss -ltn | grep -sqE ":$port\b"; do
> > +        ((port++))
> > +        if [ $port -eq 65000 ]; then port=50000; fi
> > +    done
> > +    echo picked unused port
> > +}
> 
> In retrospect I'd probably have suggested putting this into
> common.qemu as its conceptually independant of this test.

If we make it generic, should nbd_server_start_tcp_socket() in
common.nbd use it, too, instead of implementing its own loop trying to
find a free port?

Kevin