#!/usr/bin/env python
# Copyright (C) 2009 by Terry Hancock
#---------------------------------------------------------------------------------------
# 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
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#---------------------------------------------------------------------------------------
#-- Datestamp Index for Backups --

RSNAP_SRV = 'iiita.ac.in', 'website.iiita.ac.in', 'profile.iiita.ac.in', 'pldap.iiita.ac.in'
for server in RSNAP_SRV:
	from datetime import date
	import os, glob
	RSNAP_ROOTBASE = '/Backup/data/rawbackup/'
	RSNAP_ROOT = os.path.join(RSNAP_ROOTBASE, server)
	RSNAP_INTS = 'dayago', 'weekago', 'monthago'
	date_dir = os.path.join(RSNAP_ROOT, 'date')
	# get the date
	today = date.today()
	#stamp = today.isoformat()
	stamp = today.strftime("%d-%m-%Y")
	# put date in the top level of the current backup (daily.0)
	os.remove(os.path.join(RSNAP_ROOT, 'dayago.0', 'DATE'))
	open(os.path.join(RSNAP_ROOT, 'dayago.0', 'DATE'), 'wt').write(stamp+'\n')
	# delete the old index entries
	os.system('rm -r %s' % os.path.join(RSNAP_ROOT, 'date'))
	os.mkdir(os.path.join(RSNAP_ROOT, 'date'))
	#for symlink in os.listdir(date_dir):
	#    os.remove(os.path.join(date_dir, symlink))
	# read dates in all backups and write out symlinks for them as new index
	append = 'bcdefghijklmnopqrstuvwxyz'
	for interval in RSNAP_INTS:
   	 for dirname in glob.glob(os.path.join(RSNAP_ROOT, '%s.*'%interval)):
 	       	directory = os.path.join(RSNAP_ROOT, dirname)
        	datestamp = open(os.path.join(directory, 'DATE'),'rt').read().strip()
        	target = os.path.join(date_dir, datestamp)
       	 	i=0
        	while os.path.exists(target):
            		target = os.path.join(date_dir, datestamp + append[i])
            		i += 1
        	os.symlink(directory, target)