* fix issue#7476

Lib/pipes.py

@@ -267,10 +267,13 @@ _safechars = string.ascii_letters + string.digits + '!@%_-+=:,./' # Safe unquote
 _funnychars = '"`$\\'                           # Unsafe inside "double quotes"
 
 def quote(file):
+    ''' return a shell-escaped version of the file string '''
     for c in file:
         if c not in _safechars:
             break
     else:
+        if not file:
+            return "''"
         return file
     if '\'' not in file:
         return '\'' + file + '\''

Lib/test/test_pipes.py

@@ -76,6 +76,8 @@ class SimplePipeTests(unittest.TestCase):
             self.assertEqual(pipes.quote("test%s'name'" % u),
                               '"test\\%s\'name\'"' % u)
 
+        self.assertEqual(pipes.quote(''), "''")
+
     def testRepr(self):
         t = pipes.Template()
         self.assertEqual(repr(t), "<Template instance, steps=[]>")

Misc/ACKS

@@ -819,6 +819,7 @@ Dik Winter
 Blake Winton
 Jean-Claude Wippler
 Lars Wirzenius
+John Wiseman
 Chris Withers
 Stefan Witzel
 David Wolever