From 9fa90eec04454dace0f62af1f439e74803e3a0c1 Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Fri, 19 Jan 2018 16:57:18 +0300 Subject: [PATCH] iotests: implement QemuIoInteractive class Implement QemuIoInteractive to test nbd-server-remove command when there are active connections. Signed-off-by: Vladimir Sementsov-Ogievskiy Message-Id: <20180119135719.24745-5-vsementsov@virtuozzo.com> Signed-off-by: Eric Blake --- tests/qemu-iotests/iotests.py | 38 +++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py index 44477e9295..5a10b2d534 100644 --- a/tests/qemu-iotests/iotests.py +++ b/tests/qemu-iotests/iotests.py @@ -93,6 +93,44 @@ def qemu_io(*args): sys.stderr.write('qemu-io received signal %i: %s\n' % (-exitcode, ' '.join(args))) return subp.communicate()[0] + +class QemuIoInteractive: + def __init__(self, *args): + self.args = qemu_io_args + list(args) + self._p = subprocess.Popen(self.args, stdin=subprocess.PIPE, + stdout=subprocess.PIPE, + stderr=subprocess.STDOUT) + assert self._p.stdout.read(9) == 'qemu-io> ' + + def close(self): + self._p.communicate('q\n') + + def _read_output(self): + pattern = 'qemu-io> ' + n = len(pattern) + pos = 0 + s = [] + while pos != n: + c = self._p.stdout.read(1) + # check unexpected EOF + assert c != '' + s.append(c) + if c == pattern[pos]: + pos += 1 + else: + pos = 0 + + return ''.join(s[:-n]) + + def cmd(self, cmd): + # quit command is in close(), '\n' is added automatically + assert '\n' not in cmd + cmd = cmd.strip() + assert cmd != 'q' and cmd != 'quit' + self._p.stdin.write(cmd + '\n') + return self._read_output() + + def qemu_nbd(*args): '''Run qemu-nbd in daemon mode and return the parent's exit code''' return subprocess.call(qemu_nbd_args + ['--fork'] + list(args))