Function handle_clone_fail

src/copy.c:679–710

   Return FALSE if it's a terminal failure for this file.  */

static bool
handle_clone_fail (int dst_dirfd, char const *dst_relname,
                   char const *src_name, char const *dst_name,
                   int dest_desc, bool new_dst, enum Reflink_type reflink_mode)
{
  /* When the clone operation fails, report failure only with errno values
     known to mean trouble when the clone is supported and called properly.
     Do not report failure merely because !is_CLONENOTSUP (errno),
     as systems may yield oddball errno values here with FICLONE,
     and is_CLONENOTSUP is not appropriate for fclonefileat.  */
  bool report_failure = is_terminal_error (errno);

  if (reflink_mode == REFLINK_ALWAYS || report_failure)
    error (0, errno, _("failed to clone %s from %s"),
           quoteaf_n (0, dst_name), quoteaf_n (1, src_name));

  /* Remove the destination if cp --reflink=always created it
     but cloned no data.  */
  if (new_dst /* currently not for fclonefileat().  */
      && reflink_mode == REFLINK_ALWAYS
      && ((! report_failure) || lseek (dest_desc, 0, SEEK_END) == 0)
      && unlinkat (dst_dirfd, dst_relname, 0) != 0 && errno != ENOENT)
    error (0, errno, _("cannot remove %s"), quoteaf (dst_name));

  if (! report_failure)
    copy_debug.reflink = COPY_DEBUG_UNSUPPORTED;

  if (reflink_mode == REFLINK_ALWAYS || report_failure)
    return false;

  return true;
}

/* Copy a regular file from SRC_NAME to DST_NAME aka DST_DIRFD+DST_RELNAME.
   If the source file contains holes, copies holes and blocks of zeros