remove 1 unsafe (#284)

Co-authored-by: Jeff Bailey <jbailey@raspberryginger.com>

Author: oech3

Cargo.lock

@@ -43,6 +43,7 @@ phf = "0.13.0"
 phf_codegen = "0.13.0"
 rand = { version = "0.10.0" }
 regex = "1.10.4"
+rustix = "1.1.4"
 tar = "0.4"
 tempfile = "3.10.1"
 textwrap = { version = "0.16.1", features = ["terminal_size"] }
@@ -67,10 +68,10 @@ tar = { optional = true, version = "0.0.1", package = "uu_tar", path = "src/uu/t
 
 [dev-dependencies]
 chrono = { workspace = true }
-libc = { workspace = true }
 pretty_assertions = "1"
 rand = { workspace = true }
 regex = { workspace = true }
+rustix = { workspace = true, features = ["process"] }
 tar-rs-crate = { version = "0.4", package = "tar" }
 tempfile = { workspace = true }
 uucore = { workspace = true, features = ["entries", "process", "signals"] }

Cargo.toml

@@ -347,10 +347,7 @@ fn test_roundtrip_empty_files() {
 #[test]
 #[cfg(unix)]
 fn test_create_permission_denied() {
-    // SAFETY: `libc::geteuid()` is a pure function that returns the effective
-    // user ID of the calling process. It has no side effects and cannot cause
-    // undefined behavior.
-    if unsafe { libc::geteuid() } == 0 {
+    if rustix::process::geteuid().is_root() {
         eprintln!("skipping: running as root");
         return;
     }