[Python-Dev] Set program name through exec -a or environment variable (original) (raw)

Ryan Gonzalez rymg19 at gmail.com
Sat Mar 18 11:27:58 EDT 2017

exec -a would seem to end up setting argv[0] on the CPython interpreter itself, which I don't think is the desired effect...

-- Ryan (ライアン) Yoko Shimomura > ryo (supercell/EGOIST) > Hiroyuki Sawano >> everyone else http://refi64.com

On Mar 18, 2017 10:11 AM, "Freddy Rietdijk" <freddyrietdijk at fridh.nl> wrote:

Hi,

I would like to know if you're open to supporting exec -a or an environment variable for setting argv[0], and have some pointers as to where that should be implemented. On Nixpkgs we typically use wrappers to set environment variables like PATH or PYTHONPATH for individual programs. Consider a program named prog. We move the original program prog to .prog-wrapped and then create a wrapper prog that does exec -a prog .prog-wrapped. Unfortunately exec -a does not work with Python. The process is still named .prog-wrapped (although that's not really a problem) but worse, sys.argv[0] is also .prog-wrapped. Currently we inject some code in programs that sets `sys.argv=[0] = "prog" but this is fragile and I would prefer to get rid of this. Kind regards, Frederik

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