From patchwork Thu Nov 9 14:36:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luca Fancellu X-Patchwork-Id: 34153 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id EC092C4332F for ; Thu, 9 Nov 2023 14:36:45 +0000 (UTC) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mx.groups.io with SMTP id smtpd.web11.122987.1699540600645861971 for ; Thu, 09 Nov 2023 06:36:41 -0800 Authentication-Results: mx.groups.io; dkim=none (message not signed); spf=pass (domain: arm.com, ip: 217.140.110.172, mailfrom: luca.fancellu@arm.com) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 821DA12FC; Thu, 9 Nov 2023 06:37:24 -0800 (PST) Received: from e125770.cambridge.arm.com (e125770.arm.com [10.1.199.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2AF5B3F64C; Thu, 9 Nov 2023 06:36:39 -0800 (PST) From: Luca Fancellu To: openembedded-core@lists.openembedded.org Cc: diego.sueiro@arm.com, rahul.singh@arm.com Subject: [PATCH v2] oeqa,ssh: Handle SSHCall timeout error code Date: Thu, 9 Nov 2023 14:36:31 +0000 Message-Id: <20231109143631.2343003-1-luca.fancellu@arm.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 List-Id: X-Webhook-Received: from li982-79.members.linode.com [45.33.32.79] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Thu, 09 Nov 2023 14:36:45 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/190388 The current code in ssh.py is terminating the ssh process that does not finish its computation in a given timeout (when timeout is passed), the SSHCall function is returning the process error code. The Openssl ssh before version 8.6_p1 is returning 0 when it is terminated, from commit 8a9520836e71830f4fccca066dba73fea3d16bda onwards (version >= 8.6_p1) ssh is returning 255 instead. So for version of ssh older than 8.6_p1 when the SSHCall time out, the return code will be 0, meaning success, which is wrong. Fix this issue checking if the process has timeout (hence it's been terminated) and checking if the returned code is 0, in that case set it to 255 to advertise that an error occurred. Add a test case excercising the timeout in the SSHTest, test_ssh test function. Signed-off-by: Luca Fancellu --- meta/lib/oeqa/core/target/ssh.py | 17 ++++++++++++++++- meta/lib/oeqa/runtime/cases/ssh.py | 3 +++ 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/meta/lib/oeqa/core/target/ssh.py b/meta/lib/oeqa/core/target/ssh.py index f22836d390ac..f4dd0ca417a4 100644 --- a/meta/lib/oeqa/core/target/ssh.py +++ b/meta/lib/oeqa/core/target/ssh.py @@ -232,11 +232,12 @@ def SSHCall(command, logger, timeout=None, **opts): output_raw = b'' starttime = time.time() process = subprocess.Popen(command, **options) + has_timeout = False if timeout: endtime = starttime + timeout eof = False os.set_blocking(process.stdout.fileno(), False) - while time.time() < endtime and not eof: + while not has_timeout and not eof: try: logger.debug('Waiting for process output: time: %s, endtime: %s' % (time.time(), endtime)) if select.select([process.stdout], [], [], 5)[0] != []: @@ -257,6 +258,10 @@ def SSHCall(command, logger, timeout=None, **opts): logger.debug('BlockingIOError') continue + if time.time() >= endtime: + logger.debug('SSHCall has timeout! Time: %s, endtime: %s' % (time.time(), endtime)) + has_timeout = True + process.stdout.close() # process hasn't returned yet @@ -293,6 +298,16 @@ def SSHCall(command, logger, timeout=None, **opts): pass process.wait() + if has_timeout: + # Version of openssh before 8.6_p1 returns error code 0 when killed + # by a signal, when the timeout occurs we will receive a 0 error + # code because the process is been terminated and it's wrong because + # that value means success, but the process timed out. + # Afterwards, from version 8.6_p1 onwards, the returned code is 255. + # Fix this behaviour by checking the return code + if process.returncode == 0: + process.returncode = 255 + options = { "stdout": subprocess.PIPE, "stderr": subprocess.STDOUT, diff --git a/meta/lib/oeqa/runtime/cases/ssh.py b/meta/lib/oeqa/runtime/cases/ssh.py index 13aac5439698..cdbef595008c 100644 --- a/meta/lib/oeqa/runtime/cases/ssh.py +++ b/meta/lib/oeqa/runtime/cases/ssh.py @@ -13,6 +13,9 @@ class SSHTest(OERuntimeTestCase): @OETestDepends(['ping.PingTest.test_ping']) @OEHasPackage(['dropbear', 'openssh-sshd']) def test_ssh(self): + (status, output) = self.target.run('sleep 20', timeout=2) + msg='run() timed out but return code was zero.' + self.assertNotEqual(status, 0, msg=msg) (status, output) = self.target.run('uname -a') self.assertEqual(status, 0, msg='SSH Test failed: %s' % output) (status, output) = self.target.run('cat /etc/controllerimage')