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Nix appears to use posix_spawn() to spawn derivation builders, as evidenced here.

Therefore, the execve() rewriting process should itself be genericized (or superseded) to accomodate posix_spawn and potentially posix_spawnp if that becomes required.

Currently testing on macOS Monterey with Nix 2.17, and I'm getting a few random filesystem errors, meaning somehow the exec* hooks aren't covering every process, or some system calls aren't hooked into. Building nixie from the fakedir environment always ends up failing with a random Is a directory or other derivation read error. This may indicate a race condition between threads of a single process.

When running python3 /some/path/in/redirect.py, the first fopen() call does not seem to be intercepted, which results in an ENOENT.

This issue doesn't appear to affect import statements.