maybe this'll work

src/functions/users.rs

@@ -57,7 +57,7 @@ pub fn root_pass(root_pass: &str) {
             vec![
                 String::from("-c"),
                 format!(
-                    "'usermod --password $(echo {} | openssl passwd -1 -stdin) root'",
+                    r#"'usermod --password $(echo {} | openssl passwd -1 -stdin) root'"#,
                     root_pass
                 ),
             ],

src/internal/exec.rs

@@ -9,9 +9,11 @@ pub fn exec_chroot(
     command: &str,
     args: Vec<String>,
 ) -> Result<std::process::ExitStatus, std::io::Error> {
-    let returncode = Command::new("arch-chroot")
-        .args(&["/mnt", command])
-        .args(args)
+    let returncode = Command::new("bash")
+        .args(&[
+            "-c",
+            format!("arch-chroot /mnt {} {}", command, args.join(" ")).as_str(),
+        ])
         .status();
     returncode
 }