Make sequence of filenames in control.tar predictable

Replacing plain Python dict by an OrderedDict for Python versions
before 3.7, so that iteration order of "extrafiles" is determined by
insertion order.  Since 3.7 iteration order of plain dict itself is
stable.

bazelbuild#114

pkg/make_deb.py

@@ -24,6 +24,11 @@
 import textwrap
 import time
 
+if sys.version_info < (3, 7):
+  from collections import OrderedDict
+else:
+  OrderedDict = dict
+
 
 # list of debian fields : (name, mandatory, wrap[, default])
 # see http://www.debian.org/doc/debian-policy/ch-controlfields.html
@@ -166,7 +171,7 @@ def CreateDeb(output,
               conffiles=None,
               **kwargs):
   """Create a full debian package."""
-  extrafiles = {}
+  extrafiles = OrderedDict()
   if preinst:
     extrafiles['preinst'] = (preinst, 0o755)
   if postinst:
@@ -296,7 +301,7 @@ def main():
                       help='The output file, mandatory')
   parser.add_argument('--changes', required=True,
                       help='The changes output file, mandatory.')
-  parser.add_argument('--data', required=True, 
+  parser.add_argument('--data', required=True,
                       help='Path to the data tarball, mandatory')
   parser.add_argument(
       '--preinst',