DeprecationWarning in wsgi-loader.py: imp module is deprecated in favor of importlib

[rongxin-liu]

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Issue report

Fill in as much as possible so that we can understand, find and fix the problem.

Are you sure this is a bug in Passenger?
Yes. I'm seeing this deprecation warning in my server running Passenger:

/usr/share/passenger/helper-scripts/wsgi-loader.py:26: DeprecationWarning: the imp module is deprecated in favour of importlib and slated for removal in Python 3.12; see the module's documentation for alternative uses
  import sys, os, re, imp, threading, signal, traceback, socket, select, struct, logging, errno

This is the line of the code that caused the warning:
https://github.com/phusion/passenger/blob/stable-6.0/src/helper-scripts/wsgi-loader.py#L26

Question 1: What is the problem?
It appears that the wsgi-loader.py helper scripts is importing a deprecated python module imp, which is slated for removal in Python 3.12. Python 3.12 will be release tomorrow (October 2, 2023).

Question 2: Passenger version and integration mode:
Open source 6.0.18 standalone

Question 3: OS or Linux distro, platform (including version):
Ubuntu 22.04 Jammy

Question 4: Passenger installation method:

Your answer:
[ ] RubyGems + Gemfile
[ ] RubyGems, no Gemfile
[X] Phusion APT repo
[ ] Phusion YUM repo
[ ] OS X Homebrew
[ ] source tarball
[ ] Other, please specify:

Question 5: Your app's programming language (including any version managers) and framework (including versions):
Python 3.11.

Question 6: Are you using a PaaS and/or containerization? If so which one?
N/A

Question 7: Anything else about your setup that we should know?
N/A

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[gabefair]

Python 3.12 no longer has the imp module