subprocess.call() throws exception

[Ulli Horlacher]

I have a program which calls Windows CLI commands via subprocess.call():

import subprocess

def syscall(*cmd):
cmd = ['cmd','/d','/c']+list(cmd)
subprocess.call(cmd)

When I compile it with pyinstaller and start the executable via
desktop-click, it throws an exception:

Traceback (most recent call last):
File "\\VBOXSRV\python\W10\fexit_20250325_1641.py", line 3468, in <module> wexit(main())
File "\\VBOXSRV\python\W10\fexit_20250325_1641.py", line 281, in main menu()
File "\\VBOXSRV\python\W10\fexit_20250325_1641.py", line 376, in menu cls()
File "\\VBOXSRV\python\W10\fexit_20250325_1641.py", line 3366, in cls
syscall('cls')
File "\\VBOXSRV\python\W10\fexit_20250325_1641.py", line 3373, in syscall
subprocess.call(cmd)
File "subprocess.py", line 345, in call
File "subprocess.py", line 966, in __init__
File "subprocess.py", line 1435, in _execute_child
OSError: [WinError 740] The requested operation requires elevation

Why/which "elevation"?

There is no such error when I run this programm from a cmd.exe or
cygwin/bash window.

There is also no error when I I replace subprocess.call() with os.system()
but then I have to use a simple string as argument and cannot use a list of
strings.

I am using Windows 10 with:
Python 3.10.4 (tags/v3.10.4:9d38120, Mar 23 2022, 23:13:41) [MSC v.1929 64 bit (AMD64)] on win32

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Ullrich Horlacher Server und Virtualisierung
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REF:<20250325173...@tik.uni-stuttgart.de>

[João Luis Valle]

Thank you a lot!

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[Chris Barker]

the call command:

subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False, cwd=None, timeout=None, **other_popen_kwargs)

I do not understand the intricacies of subprocess, and even less so the Windows security model -- but I'd give a try to setting:

 shell=True

I *think* that will get it closer too what os.system() does.

Then look at popen, and see if any of the "other_popen_kwargs" might help.

(I do note that many of the Popen parameters are apparently "posix only" so ???

(https://docs.python.org/3/library/subprocess.html#module-subprocess)

If that doesn't work, take a look at the subprocess docs, there are notes in there about replacing os.system.

-CHB

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