From e5441aa0bae5641ba2e56736f043f2d12b8d9603 Mon Sep 17 00:00:00 2001
From: Fuad Ismail <fuad1502@gmail.com>
Date: Sun, 17 Nov 2024 10:02:11 +0700
Subject: [PATCH] dmesg: add context message to UIoError.

---
 src/uu/dmesg/src/dmesg.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/uu/dmesg/src/dmesg.rs b/src/uu/dmesg/src/dmesg.rs
index 4f1a9c3..41c7762 100644
--- a/src/uu/dmesg/src/dmesg.rs
+++ b/src/uu/dmesg/src/dmesg.rs
@@ -6,7 +6,7 @@
 use clap::{crate_version, Arg, ArgAction, Command};
 use regex::Regex;
 use std::fs;
-use uucore::{error::UResult, format_usage, help_about, help_usage};
+use uucore::{error::FromIo, error::UResult, format_usage, help_about, help_usage};
 
 mod json;
 
@@ -94,7 +94,9 @@ impl Dmesg<'_> {
     fn read_lines_from_kmsg_file(&self) -> UResult<Vec<String>> {
         let mut lines = vec![];
         let mut line = vec![];
-        for byte in fs::read(self.kmsg_file)? {
+        let kmsg_bytes = fs::read(self.kmsg_file)
+            .map_err_context(|| format!("cannot open {}", self.kmsg_file))?;
+        for byte in kmsg_bytes {
             if byte == 0 {
                 lines.push(String::from_utf8_lossy(&line).to_string());
                 line.clear();