/
wiper.py
executable file
·92 lines (86 loc) · 3.62 KB
/
wiper.py
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#!/usr/bin/python3 -tt
# vim: fileencoding=utf8
# {{{ License header: MIT
# Copyright (c) 2016 Till Maas <opensource@till.name>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# }}}
import argparse
import os
import sys
import time
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("target")
args = parser.parse_args()
fd = os.open(args.target, os.O_WRONLY)
# POSIX_FADV_NOREUSE is a no-op
# os.posix_fadvise(fd, 0, 0, os.POSIX_FADV_NOREUSE)
os.posix_fadvise(fd, 0, 0, os.POSIX_FADV_DONTNEED)
filesize = os.lseek(fd, 0, os.SEEK_END)
os.lseek(fd, 0, os.SEEK_SET)
bufsize = 512 * 4 * 1024
buf = bytearray([0] * bufsize)
allwritten = 0
remainingdata = filesize
filesize_mib = int(filesize / 2**20)
start = time.time()
laststatus = start
buffered = 0
try:
while remainingdata != 0:
remainingdata = filesize - allwritten
if remainingdata < bufsize:
bufsize = remainingdata
buf = bytearray([0] * bufsize)
written = os.write(fd, buf)
allwritten += written
buffered += written
now = time.time()
if now - laststatus > 1:
allwritten_mib = int(allwritten / 2**20)
elapsed = now - start
writespeed = allwritten / elapsed
progress = int(allwritten / filesize * 100)
remainingtime = int(remainingdata / writespeed)
sys.stderr.write("\r\x1b[KSpeed: {} KiB/s, progress: {}%, "
"remaining: {}s, elapsed: {}s, "
"written: {}/{} MiB".format(
int(writespeed / 1024), progress,
remainingtime, int(elapsed),
allwritten_mib, filesize_mib)
)
laststatus = now
if buffered > 30 * 2 ** 20:
os.fdatasync(fd)
buffered = 0
if written != bufsize:
sys.stderr.write(
"\nAborted, only wrote {} bytes, total written: {}".format(
written, allwritten))
break
except KeyboardInterrupt:
sys.stderr.write(
"\nAborted, only wrote {} bytes, total written: {}".format(
written, allwritten))
elapsed = now - start
writespeed = allwritten / elapsed
remainingdata = filesize - allwritten
sys.stderr.write("\n{} bytes remaining. writespeed: {} KiB/s\n".format(
remainingdata, int(writespeed / 1024)))