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#! /usr/bin/python2.2
# Copyright (C) 2002 by Martin Pool <mbp@samba.org>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version
# 2 as published by the Free Software Foundation.
#
# 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
# Populate a tree with pseudo-randomly distributed files to test
# rsync.
from __future__ import generators
import random, string, os, os.path
nfiles = 10000
depth = 5
n_children = 20
n_files = 20
n_symlinks = 10
name_chars = string.digits + string.letters
abuffer = 'a' * 1024
def random_name_chars():
a = ""
for i in range(10):
a = a + random.choice(name_chars)
return a
def generate_names():
n = 0
while 1:
yield "%05d_%s" % (n, random_name_chars())
n += 1
class TreeBuilder:
def __init__(self):
self.n_children = 20
self.n_files = 100
self.total_entries = 100000 # long(1e8)
self.actual_size = 0
self.name_gen = generate_names()
self.all_files = []
self.all_dirs = []
self.all_symlinks = []
def random_size(self):
return random.lognormvariate(4, 4)
def random_symlink_target(self):
what = random.choice(['directory', 'file', 'symlink', 'none'])
try:
if what == 'directory':
return random.choice(self.all_dirs)
elif what == 'file':
return random.choice(self.all_files)
elif what == 'symlink':
return random.choice(self.all_symlinks)
elif what == 'none':
return self.name_gen.next()
except IndexError:
return self.name_gen.next()
def can_continue(self):
self.total_entries -= 1
return self.total_entries > 0
def build_tree(self, prefix, depth):
"""Generate a breadth-first tree"""
for count, function in [[n_files, self.make_file],
[n_children, self.make_child_recurse],
[n_symlinks, self.make_symlink]]:
for i in range(count):
if not self.can_continue():
return
name = os.path.join(prefix, self.name_gen.next())
function(name, depth)
def print_summary(self):
print "total bytes: %d" % self.actual_size
def make_child_recurse(self, dname, depth):
if depth > 1:
self.make_dir(dname)
self.build_tree(dname, depth-1)
def make_dir(self, dname, depth='ignore'):
print "%s/" % (dname)
os.mkdir(dname)
self.all_dirs.append(dname)
def make_symlink(self, lname, depth='ignore'):
print "%s -> %s" % (lname, self.random_symlink_target())
def make_file(self, fname, depth='ignore'):
size = long(self.random_size())
print "%-70s %d" % (fname, size)
f = open(fname, 'w')
f.truncate(size)
self.fill_file(f, size)
self.all_files.append(fname)
self.actual_size += size
def fill_file(self, f, size):
while size > 0:
f.write(abuffer[:size])
size -= len(abuffer)
tb = TreeBuilder()
tb.build_tree('/tmp/foo', 3)
tb.print_summary()
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