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#!/usr/bin/python
#
# create-file -- create a file full of zeroes
# Copyright (C) 2009 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 optparse
import os
def parse_size(size):
sizes = (
("k", 1000),
("m", 1000**2),
("g", 1000**3),
("kb", 1000),
("mb", 1000**2),
("gb", 1000**3),
("kib", 1024),
("mib", 1024**2),
("gib", 1024**3),
)
size = size.lower()
for suffix, x in sizes:
if size.endswith(suffix):
amount = int(size[:-len(suffix)].strip())
return amount * x
return int(size.strip())
def parse_args():
parser = optparse.OptionParser()
parser.epilog = ("SIZE is a size. Default is in bytes, use suffixes "
"kB/MB/GB for multiples of 1000, KiB/MiB/GiB for "
"multiples of 1024. Only integers supported.")
parser.add_option("--sparse", action="store_true",
help="create a sparse file")
parser.add_option("--size", metavar="SIZE", default="0",
help="create a file of size SIZE")
options, filenames = parser.parse_args()
options.size = parse_size(options.size)
return options, filenames
def create_file(filename, options):
fd = os.open(filename, os.O_WRONLY | os.O_CREAT | os.O_EXCL, 0666)
if options.sparse:
if options.size > 0:
os.lseek(fd, options.size - 1, os.SEEK_SET)
os.write(fd, "\0")
else:
bytes = options.size
data = "\0" * 1024**2
while bytes >= len(data):
os.write(fd, data)
bytes -= len(data)
if bytes > 0:
os.write(fd, data[:bytes])
os.close(fd)
def main():
options, filenames = parse_args()
for filename in filenames:
create_file(filename, options)
if __name__ == "__main__":
main()
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