set_selinux_security_context: also display the error from the crate

+ fix comments from review

src/uu/cp/src/copydir.rs

@@ -436,7 +436,6 @@ pub(crate) fn copy_directory(
                                 &entry.source_absolute,
                                 &entry.local_to_target,
                                 &options.attributes,
-                                options,
                             )?;
                         }
                     }
@@ -467,7 +466,6 @@ pub(crate) fn copy_directory(
                 &entry.source_absolute,
                 &entry.local_to_target,
                 &options.attributes,
-                options,
             )?;
         }
     }
@@ -478,7 +476,7 @@ pub(crate) fn copy_directory(
         let dest = target.join(root.file_name().unwrap());
         for (x, y) in aligned_ancestors(root, dest.as_path()) {
             if let Ok(src) = canonicalize(x, MissingHandling::Normal, ResolveMode::Physical) {
-                copy_attributes(&src, y, &options.attributes, options)?;
+                copy_attributes(&src, y, &options.attributes)?;
             }
         }
     }

src/uu/cp/src/cp.rs

@@ -1492,7 +1492,7 @@ fn copy_source(
         if options.parents {
             for (x, y) in aligned_ancestors(source, dest.as_path()) {
                 if let Ok(src) = canonicalize(x, MissingHandling::Normal, ResolveMode::Physical) {
-                    copy_attributes(&src, y, &options.attributes, options)?;
+                    copy_attributes(&src, y, &options.attributes)?;
                 }
             }
         }
@@ -1640,12 +1640,10 @@ fn copy_extended_attrs(source: &Path, dest: &Path) -> CopyResult<()> {
 }
 
 /// Copy the specified attributes from one path to another.
-#[allow(unused_variables)]
 pub(crate) fn copy_attributes(
     source: &Path,
     dest: &Path,
     attributes: &Attributes,
-    options: &Options,
 ) -> CopyResult<()> {
     let context = &*format!("{} -> {}", source.quote(), dest.quote());
     let source_metadata = fs::symlink_metadata(source).context(context)?;
@@ -2442,7 +2440,7 @@ fn copy_file(
     if options.dereference(source_in_command_line) {
         if let Ok(src) = canonicalize(source, MissingHandling::Normal, ResolveMode::Physical) {
             if src.exists() {
-                copy_attributes(&src, dest, &options.attributes, options)?;
+                copy_attributes(&src, dest, &options.attributes)?;
             }
         }
     } else if source_is_stream && source.exists() {
@@ -2450,15 +2448,18 @@ fn copy_file(
         // like anonymous pipes. Thus, we can't really copy its
         // attributes. However, this is already handled in the stream
         // copy function (see `copy_stream` under platform/linux.rs).
-        copy_attributes(source, dest, &options.attributes, options)?;
     } else {
-        copy_attributes(source, dest, &options.attributes, options)?;
+        copy_attributes(source, dest, &options.attributes)?;
     }
 
     #[cfg(feature = "selinux")]
     if options.set_selinux_context && uucore::selinux::is_selinux_enabled() {
         // Set the given selinux permissions on the copied file.
-        uucore::selinux::set_selinux_security_context(dest, options.context.as_ref())?;
+        if let Err(e) =
+            uucore::selinux::set_selinux_security_context(dest, options.context.as_ref())
+        {
+            return Err(Error::Error(format!("SELinux error: {}", e)));
+        }
     }
 
     copied_files.insert(

tests/by-util/test_cp.rs

@@ -6292,9 +6292,7 @@ fn test_cp_selinux() {
 
         assert!(
             selinux_perm.contains("unconfined_u"),
-            "Expected '{}' not found in getfattr output:\n{}",
-            "foo",
-            selinux_perm
+            "Expected 'foo' not found in getfattr output:\n{selinux_perm}"
         );
         at.remove(&at.plus_as_string(TEST_HELLO_WORLD_DEST));
     }
@@ -6342,9 +6340,7 @@ fn test_cp_preserve_selinux() {
         let selinux_perm_dest = get_getfattr_output(&at.plus_as_string(TEST_HELLO_WORLD_DEST));
         assert!(
             selinux_perm_dest.contains("unconfined_u"),
-            "Expected '{}' not found in getfattr output:\n{}",
-            "foo",
-            selinux_perm_dest
+            "Expected 'foo' not found in getfattr output:\n{selinux_perm_dest}"
         );
         assert_eq!(
             get_getfattr_output(&at.plus_as_string(TEST_HELLO_WORLD_SOURCE)),
@@ -6373,8 +6369,8 @@ fn test_cp_preserve_selinux_admin_context() {
     at.touch(TEST_HELLO_WORLD_SOURCE);
 
     // Get the default SELinux context for the destination file path
-    // on Debian/Ubuntu, this program is provided by the selinux-utils package
-    // on Fedora/RHEL, this program is provided by the libselinux-devel package
+    // On Debian/Ubuntu, this program is provided by the selinux-utils package
+    // On Fedora/RHEL, this program is provided by the libselinux-devel package
     let output = std::process::Command::new("matchpathcon")
         .arg(at.plus_as_string(TEST_HELLO_WORLD_DEST))
         .output()
@@ -6432,7 +6428,6 @@ fn test_cp_selinux_context_priority() {
     let ts = TestScenario::new(util_name!());
     let at = &ts.fixtures;
 
-    // Create two different files
     at.write(TEST_HELLO_WORLD_SOURCE, "source content");
 
     // First, set a known context on source file (only if system supports it)
@@ -6642,7 +6637,7 @@ fn test_cp_preserve_context_root() {
     }
 
     // Copy the file with preserved context
-    // Only works at root
+    // Only works as root
     if let Ok(result) = run_ucmd_as_root(&scene, &["--preserve=context", source_file, dest_file]) {
         let src_ctx = get_getfattr_output(&at.plus_as_string(source_file));
         let dest_ctx = get_getfattr_output(&at.plus_as_string(dest_file));