hashsum: warn on file not found rather than fail

src/uu/hashsum/src/hashsum.rs

@@ -498,7 +498,8 @@ where
  I: Iterator<Item = &'a OsStr>,
 {
  let mut bad_format = 0;
- let mut failed = 0;
+ let mut failed_cksum = 0;
+ let mut failed_open_file = 0;
  let binary_marker = if options.binary { "*" } else { " " };
  for filename in files {
  let filename = Path::new(filename);
@@ -574,8 +575,19 @@ where
  }
  },
  };
- let f = File::open(ck_filename)
- .map_err_context(|| "failed to open file".to_string())?;
+ let f = match File::open(ck_filename) {
+ Err(_) => {
+ failed_open_file += 1;
+ println!(
+ "{}: {}: No such file or directory",
+ uucore::util_name(),
+ ck_filename
+ );
+ println!("{}: FAILED open or read", ck_filename);
+ continue;
+ }
+ Ok(file) => file,
+ };
  let mut ckf = BufReader::new(Box::new(f) as Box<dyn Read>);
  let real_sum = digest_reader(
  &mut options.digest,
@@ -602,7 +614,7 @@ where
  if !options.status {
  println!("{}: FAILED", ck_filename);
  }
- failed += 1;
+ failed_cksum += 1;
  }
  }
  } else {
@@ -628,8 +640,15 @@ where
  Ordering::Greater => show_warning!("{} lines are improperly formatted", bad_format),
  _ => {}
  };
- if failed > 0 {
- show_warning!("{} computed checksum did NOT match", failed);
+ if failed_cksum > 0 {
+ show_warning!("{} computed checksum did NOT match", failed_cksum);
+ }
+ match failed_open_file.cmp(&1) {
+ Ordering::Equal => show_warning!("{} listed file could not be read", failed_open_file),
+ Ordering::Greater => {
+ show_warning!("{} listed files could not be read", failed_open_file);
+ }
+ _ => {}
  }
  }
 

tests/by-util/test_hashsum.rs

@@ -117,6 +117,26 @@ fn test_check_sha1() {
  .stderr_is("");
 }
 
+#[test]
+fn test_check_file_not_found_warning() {
+ let scene = TestScenario::new(util_name!());
+ let at = &scene.fixtures;
+
+ at.write("testf", "foobar\n");
+ at.write(
+ "testf.sha1",
+ "988881adc9fc3655077dc2d4d757d480b5ea0e11 testf\n",
+ );
+ at.remove("testf");
+ scene
+ .ccmd("sha1sum")
+ .arg("-c")
+ .arg(at.subdir.join("testf.sha1"))
+ .succeeds()
+ .stdout_is("sha1sum: testf: No such file or directory\ntestf: FAILED open or read\n")
+ .stderr_is("sha1sum: warning: 1 listed file could not be read");
+}
+
 #[test]
 fn test_invalid_arg() {
  new_ucmd!().arg("--definitely-invalid").fails().code_is(1);