xprop: unable to open display ''

[PetrHar]

Hello,
i update server from debian 10 to 11.
I get an error after updating the server and agent:
/usr/bin/python3 /home/agent/wptagent-master/wptagent.py --server "https://wpt.wpserver.cz/work/" --location "Test" -vvvv --dockerized --xvbf --sharper none --username wpt --password fHjbn84Q 22:02:23.460 - Detected Browsers: 22:02:23.460 - Chrome: /opt/google/chrome/chrome 22:02:23.460 - Chrome Beta: /opt/google/chrome-beta/chrome 22:02:23.460 - Chrome Dev: /opt/google/chrome-unstable/chrome 22:02:23.460 - Chrome Canary: /opt/google/chrome-unstable/chrome 22:02:23.460 - Canary: /opt/google/chrome-unstable/chrome 22:02:23.460 - Firefox: /usr/lib/firefox/firefox 22:02:23.460 - Firefox ESR: /usr/lib/firefox-esr/firefox-esr 22:02:23.594 - Interfaces: 22:02:23.594 - {'lo': [snicaddr(family=<AddressFamily.AF_INET: 2>, address='127.0.0.1', netmask='255.0.0.0', broadcast=None, ptp=None), snicaddr(family=<AddressFamily.AF_PACKET: 17>, address='00:00:00:00:00:00', netmask=None, broadcast=None, ptp=None)], 'venet0': [snicaddr(family=<AddressFamily.AF_INET: 2>, address='185.8.164.36', netmask='255.255.255.255', broadcast='185.8.164.36', ptp=None), snicaddr(family=<AddressFamily.AF_PACKET: 17>, address='d2:2a:ca:28:2f:77', netmask=None, broadcast='ff:ff:ff:ff:ff:ff', ptp=None)], 'tunl0': [snicaddr(family=<AddressFamily.AF_PACKET: 17>, address='00:00:00:00:00:00', netmask=None, broadcast=None, ptp=None)], 'gre0': [snicaddr(family=<AddressFamily.AF_PACKET: 17>, address='00:00:00:00:00:00', netmask=None, broadcast=None, ptp=None)], 'gretap0': [snicaddr(family=<AddressFamily.AF_PACKET: 17>, address='00:00:00:00:00:00', netmask=None, broadcast='ff:ff:ff:ff:ff:ff', ptp=None)], 'erspan0': [snicaddr(family=<AddressFamily.AF_PACKET: 17>, address='00:00:00:00:00:00', netmask=None, broadcast='ff:ff:ff:ff:ff:ff', ptp=None)]} xprop: unable to open display '' Traceback (most recent call last): File "/home/agent/wptagent-master/wptagent.py", line 1185, in <module> main() File "/home/agent/wptagent-master/wptagent.py", line 1175, in main agent = WPTAgent(options, browsers) File "/home/agent/wptagent-master/wptagent.py", line 46, in __init__ self.wpt = WebPageTest(options, os.path.join(self.root_path, "work")) File "/home/agent/wptagent-master/internal/webpagetest.py", line 157, in __init__ out = subprocess.check_output(['xprop','-notype','-len','16','-root','_NET_DESKTOP_GEOMETRY'], universal_newlines=True) File "/usr/lib/python3.9/subprocess.py", line 424, in check_output return run(*popenargs, stdout=PIPE, timeout=timeout, check=True, File "/usr/lib/python3.9/subprocess.py", line 528, in run raise CalledProcessError(retcode, process.args, subprocess.CalledProcessError: Command '['xprop', '-notype', '-len', '16', '-root', '_NET_DESKTOP_GEOMETRY']' returned non-zero exit status 1.

[vlastimilott]

It seems like xprop is called although the script is running in headless mode. The reason for this might be getting current screen resolution which crashes within framebuffer. Is there any other way to get geometry? I'm not able to post a PR srry

[sharksforarms]

Also getting this after following GCE guide: https://docs.webpagetest.org/private-instances/gce_agents/#parameters

Ubuntu 20.04

[sharksforarms]

@PetrHar see: catchpoint/WebPageTest.agent-install#12