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Pierre Warnier
32c94fbc76
Fully remove nix as a direct dependency of the shadow-rs workspace. New module shadow_core::process provides process-wide POSIX wrappers via libc for setuid/setgid/initgroups/execv/sigprocmask. These MUST use libc (not rustix) because rustix intentionally provides only per-thread versions, which are incorrect for setuid-root tools. Migrations: - hardening.rs: setrlimit → rustix::process, sigprocmask → process module, User::from_uid → /etc/passwd parser lookup - pam.rs: nix::sys::termios → rustix::termios - passwd.rs: full migration (seteuid, setuid, getuid, User lookup) - newgrp.rs: full migration (termios, User lookup, setgid, initgroups, execv) - chpasswd/chage/chfn/chsh: setuid → shadow_core::process - lock.rs tests: fcntl_getfd → rustix::io libc stays for: PAM FFI, crypt(3) FFI, process-wide POSIX wrappers. nix remains only as a transitive dep of uucore (upstream).