text: #!/usr/bin/env python
  #
  # Public Domain 2016-2016 MongoDB, Inc.
  # Public Domain 2008-2016 WiredTiger, Inc.
  #
  # This is free and unencumbered software released into the public domain.
  #
  # Anyone is free to copy, modify, publish, use, compile, sell, or
  # distribute this software, either in source code form or as a compiled
  # binary, for any purpose, commercial or non-commercial, and by any
  # means.
  #
  # In jurisdictions that recognize copyright laws, the author or authors
  # of this software dedicate any and all copyright interest in the
  # software to the public domain. We make this dedication for the benefit
  # of the public at large and to the detriment of our heirs and
  # successors. We intend this dedication to be an overt act of
  # relinquishment in perpetuity of all present and future rights to this
  # software under copyright law.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  # IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  # OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  # ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  # OTHER DEALINGS IN THE SOFTWARE.
  #
  # test_readonly02.py
  #   Readonly: Test readonly mode with illegal config combinations
  #   and error checking during updates.
  #
  
  from helper import copy_wiredtiger_home
  from suite_subprocess import suite_subprocess
  import os, wiredtiger, wttest
  
  class test_readonly02(wttest.WiredTigerTestCase, suite_subprocess):
      tablename = 'table:test_readonly02'
      create = True
      create_params = 'key_format=i,value_format=i'
      entries = 10
  
      conn_params = \
          'create,statistics=(fast),log=(enabled,file_max=100K,zero_fill=true),'
      conn_params_rd = \
          'create,readonly=true,statistics=(fast),log=(enabled,zero_fill=false),'
      conn_params_rdcfg = \
          'create,readonly=true,statistics=(fast),log=(enabled),'
  
      #
      # Run to make sure incompatible configuration options return an error.
      # The situations that cause failures (instead of silent overrides) are:
      #   1. setting readonly on a new database directory
      #   2. an unclean shutdown and reopening readonly
      #   3. logging with zero-fill enabled and readonly
      #
      badcfg1 = 'log=(enabled,zero_fill=true)'
  
      def setUpConnectionOpen(self, dir):
          self.home = dir
          rdonlydir = dir + '.rdonly'
          #
          # First time through check readonly on a non-existent database.
          #
          if self.create:
              #   1. setting readonly on a new database directory
              # Setting readonly prevents creation so we should see an
              # error because the lock file does not exist.
              msg = '/No such file/'
              if os.name != 'posix':
                  msg = '/cannot find the file/'
              os.mkdir(rdonlydir)
              self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
                  lambda: self.wiredtiger_open(
                  rdonlydir, self.conn_params_rd), msg)
  
          self.create = False
          conn = self.wiredtiger_open(dir, self.conn_params)
          return conn
  
      def check_unclean(self):
          backup = "WT_COPYDIR"
          copy_wiredtiger_home(self.home, backup, True)
          msg = '/needs recovery/'
          #   2. an unclean shutdown and reopening readonly
          self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
              lambda: self.wiredtiger_open(backup, self.conn_params_rd), msg)
  
      def close_checkerror(self, cfg):
          ''' Close the connection and reopen readonly'''
          #
          # Close the original connection.  Reopen readonly and also with
          # the given configuration string.
          #
          self.close_conn()
          conn_params = self.conn_params_rd + cfg
          msg = '/Invalid argument/'
          self.assertRaisesWithMessage(wiredtiger.WiredTigerError,
              lambda: self.wiredtiger_open(self.home, conn_params), msg)
  
      def test_readonly(self):
          tablearg = self.tablename
          self.session.create(tablearg, self.create_params)
          c = self.session.open_cursor(tablearg, None, None)
          for i in range(self.entries):
              c[i+1] = i % 255
          # Check for an error on an unclean recovery/restart.
          self.check_unclean()
  
          # Close the connection.  Reopen readonly with other bad settings.
          #   3. logging with zero-fill enabled and readonly
          self.close_checkerror(self.badcfg1)
  
  if __name__ == '__main__':
      wttest.run()
  