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" 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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On 18.03.17 15:15, Freddy Rietdijk wrote:

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.

You can move the original program `prog` into the subdirectory `.wrapped` and then create a wrapper `prog` that does `exec .wrapped/prog` or `exec python3 .wrapped/prog`.