exit when the dmi file is not found

Author: pythops

src/dmi.rs

@@ -6,6 +6,7 @@ use std::{
     fmt::Display,
     fs::File,
     io::{BufRead, BufReader, Read},
+    path::Path,
 };
 
 use anyhow::{Result, bail};
@@ -82,6 +83,20 @@ impl DMI {
         let mut system: Option<System> = None;
         let mut baseboard: Option<Baseboard> = None;
 
+        let dmi_file_path = Path::new("/sys/firmware/dmi/tables/DMI");
+
+        match dmi_file_path.try_exists() {
+            Ok(true) => {}
+            Ok(false) => {
+                eprintln!("Can not find {} file", dmi_file_path.to_string_lossy());
+                std::process::exit(1);
+            }
+            Err(_) => {
+                eprintln!("e");
+                std::process::exit(1);
+            }
+        }
+
         let mem_file = File::open("/sys/firmware/dmi/tables/DMI")?;
         let mut file = BufReader::new(mem_file);