[Erp5-report] r15589 - /erp5/trunk/utils/instanceswitch.py

[nobody at svn.erp5.org]

Author: bartek
Date: Fri Aug 10 10:52:57 2007
New Revision: 15589

URL: http://svn.erp5.org?rev=15589&view=rev
Log:
A developer utility script for fast and easy switching Data.fs files within one INSTANCE_HOME.

Added:
    erp5/trunk/utils/instanceswitch.py   (with props)

Added: erp5/trunk/utils/instanceswitch.py
URL: http://svn.erp5.org/erp5/trunk/utils/instanceswitch.py?rev=15589&view=auto
==============================================================================
--- erp5/trunk/utils/instanceswitch.py (added)
+++ erp5/trunk/utils/instanceswitch.py Fri Aug 10 10:52:57 2007
@@ -1,0 +1,108 @@
+#!/usr/bin/env python
+
+""" 
+  A utility for switching Data.fs if you want to experiment with multiple
+  sites within one INSTANCE_HOME.
+
+  Usage:
+
+    run it from your INSTANCE_HOME; it will ask you if you want to
+    create a new instance, and prompt for a name of the current
+    instance. Then start zope.  Next time you run it you will be given a
+    choice of alternative Data.fs's, and an option to create a new one.
+
+  A cmdline arg "tell" will only tell you which instance you are using
+  now (which is the current).
+
+  How it works:
+
+    All it does is rename Data.fs into Data.fs.[instance_name] and write
+    the new name into file var/current. Then when you switch instances,
+    it renames Data.fs into Data.fs.[current_name] and
+    Data.fs[instance_name] into Data.fs, and writes instance_name into
+    var/current.  
+"""
+
+import glob
+import os
+import sys
+
+if len(sys.argv) > 1:
+  if sys.argv[1] == 'tell':
+    if os.path.exists('var/current'):
+      print open('var/current').read()
+    else:
+      print 'no current instance'
+    sys.exit(0)
+  else:
+    print 'I dont know cmdline arg ', sys.argv[1]
+    sys.exit(0)
+
+illegal_names = ('index', 'lock', 'tmp')
+
+def checkName(name):
+  name = name.strip()
+  if name in illegal_names:
+    print 'name can not be in ' + str(illegal_names)
+    sys.exit(0)
+
+# check if we can proceed
+if os.path.exists('var/Z2.lock') or os.path.exists('var/Z2.pid'):
+  print 'stop Zope first'
+  sys.exit(0)
+
+# if current instance is not named, name it
+if not os.path.exists('var/current'):
+  current_name = raw_input('How to name current instance? ')
+  if not current_name:
+    print 'you did not give current name'
+    sys.exit(0)
+  checkName(current_name)
+  f = open('var/current', 'w')
+  f.write(current_name)
+  f.close()
+else:
+  current_name = open('var/current').read()
+current_name = current_name.strip()
+
+# instance name can be given on the command line...
+if len(sys.argv) == 2:
+  instance_name = sys.argv[1]
+else:
+  # ...or we ask for it
+  datafs_item_list = list(enumerate([name[12:] for name in glob.glob('var/Data.fs.*') if name[12:] not in illegal_names]))
+  for item in datafs_item_list:
+    print '(%s) %s' % item
+  choice = raw_input('Enter number or name to create new instance: ')
+  checkName(choice)
+  choice = choice.strip()
+  if not choice:
+    print 'bye'
+    sys.exit(0)
+  try:
+    instance_name = datafs_item_list[int(choice)][1]
+  except ValueError:
+    instance_name = choice
+  except IndexError:
+    print 'invalid choice'
+    sys.exit(0)
+
+# check if the instance exists
+instance_exists = os.path.exists('var/Data.fs.'+instance_name)
+if not instance_exists:
+  create = raw_input('Instance ' + instance_name + ' does not exist; create? (y): ')
+  if create and create != 'y':
+    sys.exit(0)
+
+# now we go ahead
+os.rename('var/Data.fs', 'var/Data.fs.' + current_name)
+if instance_exists:
+  os.rename('var/Data.fs.' + instance_name, 'var/Data.fs')
+  # if it is new we do nothing, zope will create it
+  f = open('var/current', 'w')
+f.write(instance_name)
+f.close()
+print 'ok'
+print 'Previous instance renamed as: ' + current_name
+print 'Current instance name is: ' + instance_name
+

Propchange: erp5/trunk/utils/instanceswitch.py
------------------------------------------------------------------------------
    svn:executable = *