slot-ctrl: remove two lines of unsafe (#246)

Cargo.toml

@@ -60,6 +60,7 @@ libc = "0.2.153"
 nix = { version = "0.28", default-features = false, features = [] }
 reqwest = { version = "0.11", default-features = false, features = ["rustls-tls", "stream"] }
 ring = "0.16"
+rustix = "0.38.37"
 secrecy = "0.8"
 serde = { version = "1.0.197", features = ["derive"] }
 serde_json = "1"

slot-ctrl/Cargo.toml

@@ -20,6 +20,13 @@ orb-build-info.path = "../build-info"
 thiserror.workspace = true
 tempfile = "3.12.0"
 
+[dependencies.rustix]
+workspace = true
+features = [
+	"fs",
+	"process",
+]
+
 [build-dependencies]
 orb-build-info = { path = "../build-info", features = ["build-script"] }
 

slot-ctrl/src/efivar/mod.rs

@@ -8,6 +8,7 @@
 //! [efivar Documentation](https://www.kernel.org/doc/html/latest/filesystems/efivarfs.html)
 
 use std::{
+    ffi::c_int,
     fs::{self, File},
     io::{self, Read, Write},
     path::{Path, PathBuf},
@@ -109,7 +110,7 @@ impl EfiVar {
         let file_read =
             File::open(&self.path).map_err(|e| Error::open_file(&self.path, e))?;
 
-        let original_attributes: libc::c_int =
+        let original_attributes: c_int =
             ioctl::read_file_attributes(&file_read).map_err(Error::GetAttributes)?;
 
         // Make file mutable.

slot-ctrl/src/program.rs

@@ -64,9 +64,9 @@ enum StatusCommands {
 }
 
 fn check_running_as_root(error: crate::Error) {
-    let uid = unsafe { libc::getuid() };
-    let euid = unsafe { libc::geteuid() };
-    if !matches!((uid, euid), (0, 0)) {
+    let uid = rustix::process::getuid();
+    let euid = rustix::process::geteuid();
+    if !(uid.is_root() && euid.is_root()) {
         println!("Please try again as root user.");
         exit(1)
     }