Comments (4)
fohrloop
commented on July 17, 2024
I checked the environment variables with my current terminal (myenv) and inside the tox pytest process (testenv). These are the common environment variables:
key my test
----------- -------------------------------------------------- --------------------------------------------------
LANG en_US.UTF-8 en_US.UTF-8
TERM xterm-256color xterm-256color
PATH /home/niko/.local/bin:/home/niko/venvs/wakepy/bin: /home/niko/tmp/repos/wakepy/.tox/py310/bin:/home/n
VIRTUAL_ENV /home/niko/venvs/wakepy /home/niko/tmp/repos/wakepy/.tox/py310
HOME /home/niko /home/niko
These are the environment variables specific to the test environment:
key test
----------------------------- -----------------------------------------------------------------------------
LINES 26
TOX_PACKAGE /home/niko/tmp/repos/wakepy/.tox/.tmp/package/5/wakepy-0.6.0-py3-none-any.whl
TOX_ENV_NAME py310
PYTHONHASHSEED 424929341
PYTHONIOENCODING utf-8
TOX_ENV_DIR /home/niko/tmp/repos/wakepy/.tox/py310
PYTEST_CURRENT_TEST tests/test_wakepy.py::test_import_set_and_unset_keeepawake (call)
COLUMNS 156
PIP_DISABLE_PIP_VERSION_CHECK 1
TOX_WORK_DIR /home/niko/tmp/repos/wakepy/.tox
The test environment is really missing the environment variable DBUS_SESSION_BUS_ADDRESS. It is set on my current terminal to:
$ echo $DBUS_SESSION_BUS_ADDRESS
unix:path=/run/user/1000/bus
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fohrloop
commented on July 17, 2024
Wakepy 0.6.0 uses by default the Inhibit/Uninhibit methods of the org.freedesktop.Screensaver interface of the session D-Bus.
Reading at Well-known Message Bus Instances from D-Bus Specification:
The address of the login session message bus is given in the DBUS_SESSION_BUS_ADDRESS environment variable.
When using a breakpoint inside the test (tox+pytest), I can see that the dbus is running:
(Pdb) os.system('ps -x | grep dbus')
1107 ? Ss 0:03 /usr/bin/dbus-daemon --session --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
1246 ? S 0:00 /usr/bin/dbus-daemon --config-file=/usr/share/defaults/at-spi2/accessibility.conf --nofork --print-address 11 --address=un
14110 pts/0 S+ 0:00 sh -c ps -x | grep dbus
14113 pts/0 S+ 0:00 grep dbus
0
but there is no DBUS_SESSION_BUS_ADDRESS environment variable:
(Pdb) pprint.pprint(dict(os.environ))
{'COLUMNS': '151',
'HOME': '/home/niko',
'LANG': 'en_US.UTF-8',
'LINES': '15',
'PATH': '/home/niko/tmp/repos/wakepy/.tox/py310/bin:/home/niko/.local/bin:/home/niko/venvs/wakepy/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin',
'PIP_DISABLE_PIP_VERSION_CHECK': '1',
'PYTEST_CURRENT_TEST': 'tests/test_wakepy.py::test_import_set_and_unset_keeepawake '
'(call)',
'PYTHONHASHSEED': '1404011170',
'PYTHONIOENCODING': 'utf-8',
'TERM': 'xterm-256color',
'TOX_ENV_DIR': '/home/niko/tmp/repos/wakepy/.tox/py310',
'TOX_ENV_NAME': 'py310',
'TOX_PACKAGE': '/home/niko/tmp/repos/wakepy/.tox/.tmp/package/11/wakepy-0.6.0-py3-none-any.whl',
'TOX_WORK_DIR': '/home/niko/tmp/repos/wakepy/.tox',
'VIRTUAL_ENV': '/home/niko/tmp/repos/wakepy/.tox/py310'}
(Pdb) os.environ['DBUS_SESSION_BUS_ADDRESS']
*** KeyError: 'DBUS_SESSION_BUS_ADDRESS'
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fohrloop
commented on July 17, 2024
This can be fixed with adding DBUS_SESSION_BUS_ADDRESS to pass_env of the corresponding tox.ini section. For example:
[testenv]
description = run the tests with pytest
package = wheel
wheel_build_env = .pkg
pass_env =
DBUS_SESSION_BUS_ADDRESS
This way tox will pass the environment variable DBUS_SESSION_BUS_ADDRESS which contains the session D-Bus address, to the process running the test.
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fohrloop
commented on July 17, 2024
The reason for the exception is now clear. User should always pass the DBUS_SESSION_BUS_ADDRESS environment variable to subprocess if using wakepy with dbus method in subprocesses. I'll close this one since there are these new tickets that should make usage of wakepy more convenient:
I'm also considering if there should be some automation trying to get the DBUS_SESSION_BUS_ADDRESS from the parent python process or the dbus-daemon process. but that seems a bit hacky.
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