this post was submitted on 08 Aug 2024
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Installing gunicorn once on the OS and reuse it between venv ? (self.python)
submitted 3 months ago* (last edited 3 months ago) by SpongeB0B to c/python
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Hi,

I use gunicorn in my venv

I have quite few venv that run gunicorn.

I would like to reuse gunicorn for other venv

I launch my web application like this

#PWD = venv dir
source ./bin/activate
gunicorn A_WebApp:app
#A_WebApp is my python file A_WebApp.py

I supposes that gunicorn is a shell program ? if yes I should use $PATH ?
or gunicorn is a Python program only ? and then what I should do to use gunicorn in another venv ?

Thanks.

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[–] SpongeB0B 1 points 3 months ago* (last edited 3 months ago) (2 children)

I don't want to make the venv portable...
I want to use the gunicorn that is installed in one venv accessible to other venv

[–] onlinepersona 4 points 3 months ago (1 children)

I don't think that's possible without some dirty, dirty hacks i.e adding the right paths from the other venv to your running process. Do you want dirty hacks? Because that's just asking for trouble. If you have an application that requires libA-v1 and the gunicorn venv uses libA-v2, you're going to have a conflict at runtime.

I supposes that gunicorn is a shell program ?

source ./bin/activate
which gunicorn # outputs the path to gunicorn
less `which gunicorn` # reads gunicorn

gunicorn takes a module and a module name with a variable name. Modules are found by searching in specific paths. You can add to that search path by modifying PYTHONPATH. How it works is explained here (quite wordy).

To know which path to add to PYTHONPATH, you can either read .bin/activate and figure it out, or run something like bash -c "source ./bin/activate ; env" and it'll list all the environment variables. You can then expand (not replace) the environment variables of the current environment with those of the other environment - either in bash or in python - up to you.

As I said, dirty dirty and honestly I'd just install gunicorn in every venv then you're done with it. But if you really want to, try what I explained and see how it works for you. It's good to experiment and find out first hand.

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[–] [email protected] 5 points 3 months ago* (last edited 3 months ago) (1 children)

Wouldn't enabling the --system-site-packages flag during venv creation do exactly what the OP wants, provided that gunicorn is installed as a system package (e.g. with the distro's package manager)? https://docs.python.org/3/library/venv.html

Sharing packages between venvs would be a dirty trick indeed; though sharing with system-site-packages should be fine, AFAIK.

[–] onlinepersona 2 points 3 months ago

Hadn't considered that. It might be the solution @[email protected] is looking for. Good shout.

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[–] [email protected] 2 points 3 months ago

Why? How many kilobytes of disk space are you going to save from that?