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November 2017

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[PATCH] [Kimchi 1/1] Fix issue #1170: ERROR:KCHVM0090E: Unable to create a password-less libvirt connection to the remote libvirt daemon
by Fu.Lin 14 Nov '17

14 Nov '17

Long ago, I submitted an issue: https://github.com/kimchi-project/kimchi/issues/1170 ... Test by following script: import subprocess import os import time def _check_remote_libvirt_conn(remote_host, user='root', transport='ssh'): FNULL = open(os.devnull, 'w') dest_uri = 'qemu+%s://%s@%s/system' % (transport, user, remote_host) cmd = ['virsh', '-c', dest_uri, 'list'] proc = subprocess.Popen(cmd, stdout=FNULL, stderr=FNULL, shell=True, preexec_fn=os.setsid) timeout = 0 while proc.poll() is None: time.sleep(1) timeout += 1 if timeout == 5: print("killed") os.killpg(os.getpgid(proc.pid), signal.SIGTERM) if __name__ == '__main__': _check_remote_libvirt_conn('localhost') `proc` is timeout every time although the connection is normal tested by `virsh -c <uri>` list The following is the reason of changing(From Python Document 2.7.14): Do not use stdout=PIPE or stderr=PIPE with this function as that can deadlock based on the child process output volume. Use Popen with the communicate() method when you need pipes. Using shell=True can be a security hazard. See the warning under Frequently Used Arguments for details. At the same time, if not change, it does not work. diff --git a/model/vms.py b/model/vms.py index 6da4f3b..92e771f 100644 --- a/model/vms.py +++ b/model/vms.py @@ -1885,10 +1885,11 @@ class VMModel(object): def _check_remote_libvirt_conn(self, remote_host, user='root', transport='ssh'): + FNULL = open(os.devnull, 'w') dest_uri = 'qemu+%s://%s@%s/system' % (transport, user, remote_host) cmd = ['virsh', '-c', dest_uri, 'list'] - proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, - shell=True, preexec_fn=os.setsid) + proc = subprocess.Popen(cmd, stdout=FNULL, stderr=FNULL, + shell=False, preexec_fn=os.setsid) timeout = 0 while proc.poll() is None: time.sleep(1) -- Regards River (Fu.Lin)

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