cp: Also copy attributes in copy_symlink

Most attributes can actually be applied to symlinks (mode and
xattr are exceptions), so try to copy them, if possible.

Fort those 2 exceptions, we don't need any special handling as:
 - Mode errors would be ignored anyway.
 - The source symlink cannot have any xattr anyway, so no
   attribute is attempted to be set on the destination.

src/uu/cp/src/copydir.rs

@@ -227,7 +227,7 @@ fn copy_direntry(
     // If the source is a symbolic link and the options tell us not to
     // dereference the link, then copy the link object itself.
     if source_absolute.is_symlink() && !options.dereference {
-        return copy_link(&source_absolute, &local_to_target, symlinked_files);
+        return copy_link(&source_absolute, &local_to_target, symlinked_files, options);
     }
 
     // If the source is a directory and the destination does not

src/uu/cp/src/cp.rs

@@ -2563,7 +2563,7 @@ fn copy_helper(
         #[cfg(unix)]
         copy_fifo(dest, options.overwrite, options.debug)?;
     } else if source_is_symlink {
-        copy_link(source, dest, symlinked_files)?;
+        copy_link(source, dest, symlinked_files, options)?;
     } else {
         let copy_debug = copy_on_write(
             source,
@@ -2600,6 +2600,7 @@ fn copy_link(
     source: &Path,
     dest: &Path,
     symlinked_files: &mut HashSet<FileInformation>,
+    options: &Options,
 ) -> CopyResult<()> {
     // Here, we will copy the symlink itself (actually, just recreate it)
     let link = fs::read_link(source)?;
@@ -2608,7 +2609,8 @@ fn copy_link(
     if dest.is_symlink() || dest.is_file() {
         fs::remove_file(dest)?;
     }
-    symlink_file(&link, dest, symlinked_files)
+    symlink_file(&link, dest, symlinked_files)?;
+    copy_attributes(source, dest, &options.attributes)
 }
 
 /// Generate an error message if `target` is not the correct `target_type`

src/uucore/src/lib/features/perms.rs

@@ -41,6 +41,15 @@ pub struct Verbosity {
     pub level: VerbosityLevel,
 }
 
+impl Default for Verbosity {
+    fn default() -> Self {
+        Self {
+            groups_only: false,
+            level: VerbosityLevel::Normal,
+        }
+    }
+}
+
 /// Actually perform the change of owner on a path
 fn chown<P: AsRef<Path>>(path: P, uid: uid_t, gid: gid_t, follow: bool) -> IOResult<()> {
     let path = path.as_ref();

tests/by-util/test_cp.rs

@@ -4,7 +4,7 @@
 // file that was distributed with this source code.
 
 // spell-checker:ignore (flags) reflink (fs) tmpfs (linux) rlimit Rlim NOFILE clob btrfs neve ROOTDIR USERDIR outfile uufs xattrs
-// spell-checker:ignore bdfl hlsl IRWXO IRWXG nconfined matchpathcon libselinux-devel prwx
+// spell-checker:ignore bdfl hlsl IRWXO IRWXG nconfined matchpathcon libselinux-devel prwx doesnotexist
 use uucore::display::Quotable;
 use uutests::util::TestScenario;
 use uutests::{at_and_ucmd, new_ucmd, path_concat, util_name};
@@ -3103,6 +3103,76 @@ fn test_cp_fifo() {
     assert_eq!(permission, "prwx-wx--x".to_string());
 }
 
+#[cfg(unix)]
+#[cfg(not(target_vendor = "apple"))]
+fn find_other_group(current: u32) -> Option<u32> {
+    // Get the first group that doesn't match current
+    nix::unistd::getgroups().ok()?.iter().find_map(|group| {
+        let gid = group.as_raw();
+        (gid != current).then_some(gid)
+    })
+}
+
+#[cfg(target_vendor = "apple")]
+fn find_other_group(_current: u32) -> Option<u32> {
+    None
+}
+
+#[test]
+#[cfg(unix)]
+fn test_cp_r_symlink() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    // Specifically test copying a link in a subdirectory, as the internal path
+    // is slightly different.
+    at.mkdir("tmp");
+    // Create a symlink to a non-existent file to make sure
+    // we don't try to resolve it.
+    at.symlink_file("doesnotexist", "tmp/symlink");
+    let symlink = at.subdir.join("tmp").join("symlink");
+
+    // If we can find such a group, change the owner to a non-default to test
+    // that (group) ownership is preserved.
+    let metadata = std::fs::symlink_metadata(&symlink).unwrap();
+    let other_gid = find_other_group(metadata.gid());
+    if let Some(gid) = other_gid {
+        uucore::perms::wrap_chown(
+            &symlink,
+            &metadata,
+            None,
+            Some(gid),
+            false,
+            uucore::perms::Verbosity::default(),
+        )
+        .expect("Cannot chgrp symlink.");
+    } else {
+        println!("Cannot find a second group to chgrp to.");
+    }
+
+    // Use -r to make sure we copy the symlink itself
+    // --preserve will include ownership
+    ucmd.arg("--preserve")
+        .arg("-r")
+        .arg("tmp")
+        .arg("tmp2")
+        .succeeds()
+        .no_stderr()
+        .no_stdout();
+
+    // Is symlink2 still a symlink, and does it point at the same place?
+    assert!(at.is_symlink("tmp2/symlink"));
+    let symlink2 = at.subdir.join("tmp2/symlink");
+    assert_eq!(
+        std::fs::read_link(&symlink).unwrap(),
+        std::fs::read_link(&symlink2).unwrap(),
+    );
+
+    // If we found a suitable group, is the group correct after the copy.
+    if let Some(gid) = other_gid {
+        let metadata2 = std::fs::symlink_metadata(&symlink2).unwrap();
+        assert_eq!(metadata2.gid(), gid);
+    }
+}
+
 #[test]
 fn test_dir_recursive_copy() {
     let scene = TestScenario::new(util_name!());