If sys.stdin is not a tty, fall back to default_getpass after printing

a warning instead of failing with a termios.error.

Lib/getpass.py

@@ -24,6 +24,10 @@ def unix_getpass(prompt='Password: ', stream=None):
     if stream is None:
         stream = sys.stdout
 
+    if not sys.stdin.isatty():
+        print >>sys.stderr, "Warning: sys.stdin is not a tty."
+        return default_getpass(prompt)
+
     try:
         fd = sys.stdin.fileno()
     except:

Misc/NEWS

@@ -37,6 +37,9 @@ Extensions Modules
 Library
 -------
 
+- getpass.getpass() now works when sys.stdin is not a tty by printing a warning
+  and falling back to sys.stdin.readline instead of raising termios.error.
+
 - Issue #2014: Allow XML-RPC datetime objects to have dates before
   1900-01-01.