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Re: [PATCH v2] tests/avocado: starts PhoneServer upfront


From: Thomas Huth
Subject: Re: [PATCH v2] tests/avocado: starts PhoneServer upfront
Date: Mon, 14 Mar 2022 10:55:14 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.0

On 11/03/2022 18.11, Beraldo Leal wrote:
Race conditions can happen with the current code, because the port that
was available might not be anymore by the time the server is started.

By setting the port to 0, PhoneServer it will use the OS default
behavior to get a free port, then we save this information so we can
later configure the guest.

Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Beraldo Leal <bleal@redhat.com>
---
  tests/avocado/avocado_qemu/__init__.py | 13 +++++++------
  1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/tests/avocado/avocado_qemu/__init__.py 
b/tests/avocado/avocado_qemu/__init__.py
index 9b056b5ce5..ac85e36a4d 100644
--- a/tests/avocado/avocado_qemu/__init__.py
+++ b/tests/avocado/avocado_qemu/__init__.py
@@ -18,7 +18,7 @@
  import uuid
import avocado
-from avocado.utils import cloudinit, datadrainer, network, process, ssh, 
vmimage
+from avocado.utils import cloudinit, datadrainer, process, ssh, vmimage
  from avocado.utils.path import find_command
#: The QEMU build root directory. It may also be the source directory
@@ -602,9 +602,6 @@ def prepare_cloudinit(self, ssh_pubkey=None):
          self.log.info('Preparing cloudinit image')
          try:
              cloudinit_iso = os.path.join(self.workdir, 'cloudinit.iso')
-            self.phone_home_port = network.find_free_port()
-            if not self.phone_home_port:
-                self.cancel('Failed to get a free port')
              pubkey_content = None
              if ssh_pubkey:
                  with open(ssh_pubkey) as pubkey:
@@ -614,7 +611,7 @@ def prepare_cloudinit(self, ssh_pubkey=None):
                            password=self.password,
                            # QEMU's hard coded usermode router address
                            phone_home_host='10.0.2.2',
-                          phone_home_port=self.phone_home_port,
+                          phone_home_port=self.phone_server.server_port,
                            authorized_key=pubkey_content)
          except Exception:
              self.cancel('Failed to prepare the cloudinit image')
@@ -625,6 +622,8 @@ def set_up_boot(self):
          self.vm.add_args('-drive', 'file=%s' % path)
def set_up_cloudinit(self, ssh_pubkey=None):
+        self.phone_server = cloudinit.PhoneHomeServer(('0.0.0.0', 0),
+                                                      self.name)
          cloudinit_iso = self.prepare_cloudinit(ssh_pubkey)
          self.vm.add_args('-drive', 'file=%s,format=raw' % cloudinit_iso)
@@ -635,7 +634,9 @@ def launch_and_wait(self, set_up_ssh_connection=True):
                                                   
logger=self.log.getChild('console'))
          console_drainer.start()
          self.log.info('VM launched, waiting for boot confirmation from guest')
-        cloudinit.wait_for_phone_home(('0.0.0.0', self.phone_home_port), 
self.name)
+        while not self.phone_server.instance_phoned_back:
+            self.phone_server.handle_request()
+
          if set_up_ssh_connection:
              self.log.info('Setting up the SSH connection')
              self.ssh_connect(self.username, self.ssh_key)

Thank you very much, this indeed fixes my problem with find_free_port() in the related tests:

Tested-by: Thomas Huth <thuth@redhat.com>




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