* sha1.el (sha1-string-external): default-directory "/" in case

otherwise non-existent.  process-connection-type pipe for touch of
efficiency recommended by elisp manual.  (An aside in Bug#3911.)

2 files changed, 7 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index a36645dc974..18ced5b6512 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -3,6 +3,10 @@
         * log-view.el: Add "Keywords: tools", since its other keywords
         aren't in finder-known-keywords, and following vc.el.
 
+        * sha1.el (sha1-string-external): default-directory "/" in case
+        otherwise non-existent.  process-connection-type pipe for touch of
+        efficiency recommended by elisp manual.  (An aside in Bug#3911.)
+
 2009-11-26  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         Misc coding convention cleanups.
diff --git a/lisp/sha1.el b/lisp/sha1.el
index 4aca53f196c..9fe327e514e 100644
--- a/lisp/sha1.el
+++ b/lisp/sha1.el
@@ -86,7 +86,9 @@ If this variable is set to nil, use internal function only."
   :group 'sha1)
 
 (defun sha1-string-external (string &optional binary)
-  (let (prog args digest)
+  (let ((default-directory "/") ;; in case otherwise non-existent
+        (process-connection-type nil) ;; pipe
+        prog args digest)
     (if (consp sha1-program)
         (setq prog (car sha1-program)
               args (cdr sha1-program))