stdbuf: extract error message from OS & strip errno

src/uu/stdbuf/locales/en-US.ftl

@@ -27,7 +27,5 @@ stdbuf-error-value-too-large = invalid mode '{$value}': Value too large for defi
 stdbuf-error-external-libstdbuf-not-found = External libstdbuf not found at configured path: {$path}
 stdbuf-error-preload-path-separator = libstdbuf path {$path} contains ':', which cannot be represented in {$var}
   stdbuf: set TMPDIR to a directory whose path has no ':'
-stdbuf-error-permission-denied = failed to execute process: Permission denied
-stdbuf-error-no-such-file = failed to execute process: No such file or directory
 stdbuf-error-failed-to-execute = failed to execute process: {$error}
 stdbuf-error-killed-by-signal = process killed by signal {$signal}

src/uu/stdbuf/locales/fr-FR.ftl

@@ -26,7 +26,5 @@ stdbuf-error-value-too-large = mode invalide '{$value}' : Valeur trop grande pou
 stdbuf-error-external-libstdbuf-not-found = libstdbuf externe introuvable au chemin configuré : {$path}
 stdbuf-error-preload-path-separator = le chemin de libstdbuf {$path} contient ':', ce qui ne peut pas être représenté dans {$var}
   stdbuf: définissez TMPDIR vers un répertoire dont le chemin ne contient pas ':'
-stdbuf-error-permission-denied = échec de l'exécution du processus : Permission refusée
-stdbuf-error-no-such-file = échec de l'exécution du processus : Aucun fichier ou répertoire de ce type
 stdbuf-error-failed-to-execute = échec de l'exécution du processus : {$error}
 stdbuf-error-killed-by-signal = processus tué par le signal {$signal}

src/uu/stdbuf/src/stdbuf.rs

@@ -15,7 +15,7 @@ use tempfile::TempDir;
 use tempfile::tempdir;
 use thiserror::Error;
 use uucore::display::Quotable;
-use uucore::error::{UResult, USimpleError, UUsageError};
+use uucore::error::{UResult, USimpleError, UUsageError, strip_errno};
 use uucore::format_usage;
 use uucore::parser::parse_size::parse_size_u64;
 use uucore::translate;
@@ -236,20 +236,15 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         Err(err) => err,
     };
     // exec() only returns if there was an error
-    match e.kind() {
-        std::io::ErrorKind::PermissionDenied => Err(USimpleError::new(
-            126,
-            translate!("stdbuf-error-permission-denied"),
-        )),
-        std::io::ErrorKind::NotFound => Err(USimpleError::new(
-            127,
-            translate!("stdbuf-error-no-such-file"),
-        )),
-        _ => Err(USimpleError::new(
-            1,
-            translate!("stdbuf-error-failed-to-execute", "error" => e),
-        )),
-    }
+    let exit_code = match e.kind() {
+        std::io::ErrorKind::PermissionDenied => 126,
+        std::io::ErrorKind::NotFound => 127,
+        _ => 1,
+    };
+    Err(USimpleError::new(
+        exit_code,
+        translate!("stdbuf-error-failed-to-execute", "error" => strip_errno(&e)),
+    ))
 }
 
 pub fn uu_app() -> Command {