New function str_isnum(). don't crash and burn on empty changes files in parse_changes().

utils.py

 # Utility functions
 # Copyright (C) 2000  James Troup <james@nocrew.org>
-# $Id: utils.py,v 1.15 2001-02-25 06:47:27 ajt Exp $
+# $Id: utils.py,v 1.16 2001-03-02 02:45:01 troup Exp $
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
-import commands, os, re, socket, shutil, stat, string, sys, tempfile
+import commands, os, re, socket, shutil, stat, string, sys, tempfile, apt_pkg
 
 re_comments = re.compile(r"\#.*")
 re_no_epoch = re.compile(r"^\d*\:")
@@ -57,6 +57,16 @@ def our_raw_input():
 
 ######################################################################################
 
+# Obsoleted by python >= 1.6
+
+def str_isnum (s):
+    for c in s:
+        if c not in string.digits:
+            return 0;
+    return 1;
+
+######################################################################################
+
 # What a mess.  FIXME
 def extract_component_from_section(section):
     component = "";
@@ -99,6 +109,9 @@ def parse_changes(filename, dsc_whitespace_rules):
     changes = {};
     lines = changes_in.readlines();
 
+    if lines == []:
+	raise changes_parse_error_exc, "[Empty changes file]";
+
     # Reindex by line number so we can easily verify the format of
     # .dsc files...
     index = 0;