Remove redundant log statement in echo1 and add confirmation log in reset_device

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "phenix"
 description = "Utility to restart PCIe devices when link is lost."
-version = "0.1.4"
+version = "0.2.1"
 edition = "2024"
 license = "GPL-3.0-or-later"
 repository="https://code.edgarpierre.fr/edpibu/phenix"

src/main.rs

@@ -1,13 +1,20 @@
 #![feature(file_buffered)]
+use std::env;
 use std::fs::File;
 use std::io::BufRead;
 use std::io::Write;
+use std::io::Seek;
+use std::io::SeekFrom;
 
 fn main() {
     println!("Reading kernel messages...");
 
-    let kmsg_file = File::open_buffered("/dev/kmsg").expect("Failed to open /dev/kmsg");
+    let mut kmsg_file =
+        File::open_buffered(env::var("PHENIX_KMSG").unwrap_or(String::from("/dev/kmsg")))
+            .expect("Failed to open /dev/kmsg");
 
+
+    kmsg_file.seek(SeekFrom::End(0)).expect("Failed to seek to end");
     let lines = kmsg_file.lines();
     for line in lines {
         match line {
@@ -23,8 +30,9 @@ fn manage_line(line: String) {
             println!("PCIe link lost {prefix}");
 
             let id = line.splitn(3, " ").nth(1);
-            if let Some(id) = id {
-                reset_device(id);
+            match id {
+                Some(id) => reset_device(id),
+                None => println!("No device id found in message {line}"),
             }
         }
     }
@@ -33,6 +41,7 @@ fn manage_line(line: String) {
 fn reset_device(id: &str) {
     println!("Resetting {id}");
     echo1(rm_file_path(&id));
+    println!("Removed device {id}");
     echo1(String::from("/sys/bus/pci/rescan"));
     println!("Rescanned PCI bus");
 }
@@ -44,7 +53,6 @@ fn echo1(path: String) {
         Ok(mut file) => {
             file.write_all(b"1")
                 .expect("Failed to write to remove file");
-            println!("Removed device {path}");
         }
     }
 }