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#!/usr/bin/python
# Copyright 2011 Lars Wirzenius
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
import cliapp
import os
import ttystatus
import genbackupdatalib
class GenbackupdataApp(cliapp.Application):
def add_settings(self):
self.settings.bytesize(
['create', 'c'],
'how much data to create (default: %default)')
self.settings.bytesize(
['file-size'],
'size of one file',
default=16 * 1024)
self.settings.bytesize(
['chunk-size'],
'generate data in chunks of this size',
default=16 * 1024)
self.settings.integer(
['depth'],
'depth of directory tree',
default=3)
self.settings.integer(
['max-files'],
'max files/dirs per dir',
default=128)
self.settings.integer(
['seed'],
'seed for random number generator',
default=0)
self.settings.boolean(
['quiet'],
'do not report progress')
def process_args(self, args):
outputdir = args[0]
bytes = self.settings['create']
self.gen = genbackupdatalib.DataGenerator(self.settings['seed'])
self.names = genbackupdatalib.NameGenerator(
outputdir, self.settings['depth'], self.settings['max-files'])
self.setup_ttystatus(outputdir)
self.status['total'] = bytes
while bytes > 0:
n = min(self.settings['file-size'], bytes)
self.create_file(n)
bytes -= n
self.status.flush()
self.status.finish()
def create_file(self, bytes):
'''Generate one output file.'''
file_size = self.settings['file-size']
chunk_size = self.settings['chunk-size']
pathname = self.names.new()
dirname = os.path.dirname(pathname)
if not os.path.exists(dirname):
os.makedirs(dirname)
with open(pathname, 'wb') as f:
while bytes >= chunk_size:
self.write_bytes(f, chunk_size)
bytes -= chunk_size
if bytes > 0:
self.write_bytes(f, bytes)
def write_bytes(self, f, bytes):
chunk = self.gen.generate(bytes)
f.write(chunk)
self.status['written'] += bytes
def setup_ttystatus(self, outputdir):
self.status = ttystatus.TerminalStatus(period=0.1)
if self.settings['quiet']:
self.status.disable()
if hasattr(self.status, 'start_new_line'):
self.status.format(
'Generating backup data: %Pathname(outputdir)\n'
'%ByteSize(written) of %ByteSize(total) '
'%PercentDone(written,total) (%ByteSpeed(written))\n'
'%RemainingTime(written,total) %ProgressBar(written,total)')
else:
self.status.format(
'Generating %ByteSize(written) of %ByteSize(total) '
'%PercentDone(written,total) (%ByteSpeed(written))')
self.status['written'] = 0
self.status['total'] = 0
self.status['outputdir'] = outputdir
if __name__ == '__main__':
GenbackupdataApp().run()
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