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`.
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