Re: dired-do-copy may create infinite directory hierarchy, again

[Thierry Volpiatto <thierry.volpiatto@gmail.com>]

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Thierry Volpiatto <thierry.volpiatto@gmail.com> writes:

>>   bug#10489: 24.0.92; dired-do-copy may create infinite directory hierarchy
>>
>> after it had been closed, saying that there are still problems.
>> Unfortunately I got no answer.  Since it was an important bug: Can
>> please somebody have a look?  Thanks.

>> But I only wanted a symlink...  This worked in Emacs 23.
>>
> Need to be fixed.

The attached patch should fix this also, please review it and test it (quite
busy actually, not fully tested), and if no objections I will apply it.
Thanks.


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# HG changeset patch
# User Thierry Volpiatto <thierry.volpiatto@gmail.com>
# Date 1333042420 -7200
# Node ID c2de4670a69cefd92095caca612f8b1e4fd0c217
# Parent  0c4996976cc3ded487b93f71a27641a48c127767
* lisp/files.el (copy-directory): Check if file is a directory but a symlink.

diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -1264,7 +1264,8 @@
 
 (defun dired-copy-file-recursive (from to ok-flag &optional
 				       preserve-time top recursive)
-  (when (file-subdir-of-p to from)
+  (when (and (eq t (car (file-attributes from)))
+             (file-subdir-of-p to from))
     (error "Cannot copy `%s' into its subdirectory `%s'" from to))
   (let ((attrs (file-attributes from)))
     (if (and recursive
@@ -1452,10 +1453,14 @@
                          (eq file-creator 'dired-copy-file))
                 (setq to destname))
               ;; If DESTNAME and FROM are the same directory or
-              ;; If DESTNAME is a subdirectory of FROM, return error.
-              (and (file-subdir-of-p destname from)
-                   (error "Cannot copy `%s' into its subdirectory `%s'"
-                          from to)))
+              ;; If DESTNAME is a subdirectory of FROM, not a symlink,
+              ;; and the method in use is copying return error.
+              (when (and (eq t          ; A dir but not a symlink.
+                             (car (file-attributes destname)))
+                         (eq file-creator 'dired-copy-file)
+                         (file-subdir-of-p destname from))
+                (error "Here:Cannot copy `%s' into its subdirectory `%s'"
+                       from to)))
             (condition-case err
                 (progn
                   (funcall file-creator from to dired-overwrite-confirmed)
diff --git a/lisp/files.el b/lisp/files.el
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -5102,10 +5102,10 @@
 	       ;; We do not want to copy "." and "..".
 	       (directory-files directory 'full
 				directory-files-no-dot-files-regexp))
-	(if (file-directory-p file)
-	    (copy-directory file newname keep-time parents)
-	  (let ((target (expand-file-name (file-name-nondirectory file) newname))
-		(attrs (file-attributes file)))
+        (let ((target (expand-file-name (file-name-nondirectory file) newname))
+              (attrs (file-attributes file)))
+          (if (eq t (car attrs)) ; A directory but not a symlink.
+              (copy-directory file newname keep-time parents)
 	    (if (stringp (car attrs)) ; Symbolic link
 		(make-symbolic-link (car attrs) target t)
 	      (copy-file file target t keep-time)))))

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-- 
  Thierry
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