Eryk Sun <eryk...@gmail.com> added the comment:
In some cases, the problem can be worked around by setting the
__PYVENV_LAUNCHER__ environment variable and executing the base executable. For
example:
import os
import sys
import subprocess
def get_python_exe_env():
if sys.executable == getattr(sys, '_base_executable', sys.executable):
return sys.executable, None
environ = os.environ.copy()
environ['__PYVENV_LAUNCHER__'] = sys.executable
return sys._base_executable, environ
executable, environ = get_python_exe_env()
p = subprocess.Popen([executable], env=environ)
---
As is, I don't know how to solve the problem in which an arbitrary application
runs a script using the "python" launcher. Half of the problem could be solved.
When the launcher creates the base Python process, it could set the parent via
PROC_THREAD_ATTRIBUTE_PARENT_PROCESS [1], presuming it can open a handle for
the parent application with PROCESS_CREATE_PROCESS access. However, this
doesn't solve the problem from the application's perspective. It still gets the
handle and process ID of the launcher.
If the purpose of using a launcher was only to allow an in-place upgrade of the
base "python3x.dll", then an alternative design would be to set the
__PYVENV_LAUNCHER__ environment variable, load the Python DLL from the
pyvenv.cfg "home" directory, and call Py_Main(argc, argv). This would eliminate
the parent<->child problem and the application directory (__APPDIR__) problem.
However, naively implementing something like that cannot work for the store app
distribution. "python3x.dll" in the app installation directory under
"%ProgramFiles%\WindowsApps" only grants execute access to users that have the
app's WIN://SYSAPPID identifier in their access token, which gets added by
CreateProcessW() when the "python[3[.x]].exe" appexec link is executed. I'd
have to experiment to see what works. Maybe "python.exe" in the virtual
environment could be created as an appexec link to "venvlauncher.exe" in the
app, which loads the DLL, etc.
---
[1]
https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-updateprocthreadattribute
----------
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<https://bugs.python.org/issue38905>
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