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diff --git a/src/util/testrealm.py b/src/util/testrealm.py
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+# Copyright (C) 2010 by the Massachusetts Institute of Technology.
+# All rights reserved.
+
+# Export of this software from the United States of America may
+#   require a specific license from the United States Government.
+#   It is the responsibility of any person or organization contemplating
+#   export to obtain such a license before exporting.
+#
+# WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+# distribute this software and its documentation for any purpose and
+# without fee is hereby granted, provided that the above copyright
+# notice appear in all copies and that both that copyright notice and
+# this permission notice appear in supporting documentation, and that
+# the name of M.I.T. not be used in advertising or publicity pertaining
+# to distribution of the software without specific, written prior
+# permission.  Furthermore if you modify this software you must label
+# your software as modified software and not distribute it in such a
+# fashion that it might be confused with the original M.I.T. software.
+# M.I.T. makes no representations about the suitability of
+# this software for any purpose.  It is provided "as is" without express
+# or implied warranty.
+
+# Invoked by the testrealm target in the top-level Makefile.  Creates
+# a test realm and spawns a shell pointing at it, for convenience of
+# manual testing.
+
+from k5test import *
+
+# A list of directories containing programs in the build tree.
+progpaths = [
+    'kdc',
+    os.path.join('kadmin', 'server'),
+    os.path.join('kadmin', 'cli'),
+    os.path.join('kadmin', 'dbutil'),
+    os.path.join('kadmin', 'ktutil'),
+    os.path.join('clients', 'kinit'),
+    os.path.join('clients', 'klist'),
+    os.path.join('clients', 'kdestroy'),
+    os.path.join('clients', 'kpasswd'),
+    'slave'
+]
+
+# Add program directories to the beginning of PATH.
+def supplement_path(env):
+    # Construct prefixes; these will end in a trailing separator.
+    path_prefix = manpath_prefix = ''
+    for dir in progpaths:
+        path_prefix += os.path.join(buildtop, dir) + os.pathsep
+
+    # Assume PATH exists in env for simplicity.
+    env['PATH'] = path_prefix + env['PATH']
+
+realm = K5Realm()
+env = realm.env_master.copy()
+supplement_path(env)
+
+print
+print 'Realm files are in %s' % realm.testdir
+print 'KRB5_CONFIG is %s' % env['KRB5_CONFIG']
+print 'KRB5_KDC_PROFILE is %s' % env['KRB5_KDC_PROFILE']
+print 'KRB5CCNAME is %s' % env['KRB5CCNAME']
+print 'KRB5_KTNAME is %s' % env['KRB5_KTNAME']
+print 'KRB5RCACHEDIR is %s' % env['KRB5RCACHEDIR']
+print 'Password for user is %s' % password('user')
+print 'Password for admin is %s' % password('admin')
+print
+
+subprocess.call([os.getenv('SHELL')], env=env)
+success('Create test krb5 realm.')