Fix bug #4673 with Dired when `stat' fails for ".." or other files.

 lisp/ls-lisp.el (ls-lisp-sanitize): New function.
 (ls-lisp-insert-directory): Use it to fix or remove any elements
 in file-alist with missing attributes.

2 files changed, 23 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 60ececebe26..2ac59b16494 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,9 @@
+2012-02-07  Eli Zaretskii  <eliz@gnu.org>
+
+        * ls-lisp.el (ls-lisp-sanitize): New function.
+        (ls-lisp-insert-directory): Use it to fix or remove any elements
+        in file-alist with missing attributes.  (Bug#4673)
+
 2012-02-07  Alan Mackenzie  <acm@muc.de>
 
         Fix spurious recognition of c-in-knr-argdecl.
diff --git a/lisp/ls-lisp.el b/lisp/ls-lisp.el
index 576c746761d..de489871887 100644
--- a/lisp/ls-lisp.el
+++ b/lisp/ls-lisp.el
@@ -331,6 +331,7 @@ not contain `d', so that a full listing is expected."
              ;; do all bindings here for speed
              total-line files elt short file-size attr
              fuid fgid uid-len gid-len)
+        (setq file-alist (ls-lisp-sanitize file-alist))
         (cond ((memq ?A switches)
                (setq file-alist
                      (ls-lisp-delete-matching "^\\.\\.?$" file-alist)))
@@ -437,6 +438,22 @@ not contain `d', so that a full listing is expected."
         (message "%s: doesn't exist or is inaccessible" file)
         (ding) (sit-for 2)))))          ; to show user the message!
 
+(defun ls-lisp-sanitize (file-alist)
+  "Sanitize the elements in FILE-ALIST.
+Fixes any elements in the alist for directory entries whose file
+attributes are nil (meaning that `file-attributes' failed for
+them).  This is known to happen for some network shares, in
+particular for the \"..\" directory entry.
+
+If the \"..\" directory entry has nil attributes, the attributes
+are copied from the \".\" entry, if they are non-nil.  Otherwise,
+the offending element is removed from the list, as are any
+elements for other directory entries with nil attributes."
+  (if (and (null (cdr (assoc ".." file-alist)))
+           (cdr (assoc "." file-alist)))
+      (setcdr (assoc ".." file-alist) (cdr (assoc "." file-alist))))
+  (rassq-delete-all nil file-alist))
+
 (defun ls-lisp-column-format (file-alist)
   "Insert the file names (only) in FILE-ALIST into the current buffer.
 Format in columns, sorted vertically, following GNU ls -C.