[Python-Dev] Set program name through exec -a or environment variable (original) (raw)
Freddy Rietdijk freddyrietdijk at fridh.nl
Sat Mar 18 09:15:12 EDT 2017
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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,
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