Remove the auto capitalization of error message

src/uucore/src/lib/mods/error.rs

@@ -396,7 +396,7 @@ impl Display for UIoError {
  fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
  use std::io::ErrorKind::*;
 
- let mut message;
+ let message;
  let message = if self.inner.raw_os_error().is_some() {
  // These are errors that come directly from the OS.
  // We want to normalize their messages across systems,
@@ -424,7 +424,6 @@ impl Display for UIoError {
  // (https:/rust-lang/rust/issues/86442)
  // are stabilized, we should add them to the match statement.
  message = strip_errno(&self.inner);
- capitalize(&mut message);
  &message
  }
  }
@@ -435,7 +434,6 @@ impl Display for UIoError {
  // a file that was not found.
  // There are also errors with entirely custom messages.
  message = self.inner.to_string();
- capitalize(&mut message);
  &message
  };
  if let Some(ctx) = &self.context {
@@ -446,13 +444,6 @@ impl Display for UIoError {
  }
 }
 
-/// Capitalize the first character of an ASCII string.
-fn capitalize(text: &mut str) {
- if let Some(first) = text.get_mut(..1) {
- first.make_ascii_uppercase();
- }
-}
-
 /// Strip the trailing " (os error XX)" from io error strings.
 pub fn strip_errno(err: &std::io::Error) -> String {
  let mut msg = err.to_string();

tests/by-util/test_cp.rs

@@ -2724,7 +2724,7 @@ fn test_copy_dir_preserve_permissions_inaccessible_file() {
  ucmd.args(&["-p", "-R", "d1", "d2"])
  .fails()
  .code_is(1)
- .stderr_only("cp: cannot open 'd1/f' for reading: Permission denied\n");
+ .stderr_only("cp: cannot open 'd1/f' for reading: permission denied\n");
  assert!(at.dir_exists("d2"));
  assert!(!at.file_exists("d2/f"));