fuzz(cksum): fix fuzzer to use GNU's binary instead of the systems', remove false positives, improve logging

Author: RenjiSann

fuzz/fuzz_targets/fuzz_cksum.rs

@@ -11,7 +11,8 @@ use uu_cksum::uumain;
 mod fuzz_common;
 use crate::fuzz_common::{
     compare_result, generate_and_run_uumain, generate_random_file, generate_random_string,
-    run_gnu_cmd, CommandResult,
+    pretty_print::{print_or_empty, print_test_begin},
+    replace_fuzz_binary_name, run_gnu_cmd, CommandResult,
 };
 use rand::Rng;
 use std::env::temp_dir;
@@ -129,13 +130,15 @@ fuzz_target!(|_data: &[u8]| {
         if let Ok(checksum_file_path) =
             generate_checksum_file(algo, &file_path, &selected_digest_opts)
         {
+            print_test_begin(format!("cksum {:?}", args));
+
             if let Ok(content) = fs::read_to_string(&checksum_file_path) {
-                println!("File content: {checksum_file_path}={content}");
+                println!("File content ({})", checksum_file_path);
+                print_or_empty(&content);
             } else {
                 eprintln!("Error reading the checksum file.");
             }
-            println!("args: {:?}", args);
-            let rust_result = generate_and_run_uumain(&args, uumain, None);
+            let mut rust_result = generate_and_run_uumain(&args, uumain, None);
 
             let gnu_result = match run_gnu_cmd(CMD_PATH, &args[1..], false, None) {
                 Ok(result) => result,
@@ -151,6 +154,9 @@ fuzz_target!(|_data: &[u8]| {
                 }
             };
 
+            // Lower the number of false positives caused by binary names
+            replace_fuzz_binary_name("cksum", &mut rust_result);
+
             compare_result(
                 "cksum",
                 &format!("{:?}", &args[1..]),