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#!/usr/bin/python3
import os
import re
import subprocess
import humanfriendly
from structures import Progress
class Extract:
_progress_re = re.compile(r'^\s*(\S+)\s+\[([^]]+)/s\]\s+ETA\s+(\S+)\s*$')
def __init__(self, src, dst):
common_parameters = dict(
encoding='utf8',
env={**os.environ,
**{'LC_ALL':'C.UTF-8',
'LANG':'C.UTF-8',
'LANGUAGE':'C.UTF-8',
}},
)
self.src_size = os.stat(src).st_size
self.pv_proc = subprocess.Popen(
[
'pv',
'--force',
'--format', '%b %a %e',
src,
],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
**common_parameters,
)
lzip_command = '/usr/bin/lzip'
plzip_command = '/usr/bin/plzip'
lzip_command_to_use = lzip_command
if os.path.exists(plzip_command):
lzip_command_to_use = plzip_command
self.zip_proc = subprocess.Popen(
[
lzip_command_to_use,
'--decompress',
],
stdin=self.pv_proc.stdout,
stdout=subprocess.PIPE,
**common_parameters,
)
self.tar_proc = subprocess.Popen(
[
'tar',
'-C', dst,
'-xf', '-'
],
stdin=self.zip_proc.stdout,
**common_parameters,
)
self.last_progress = Progress()
def select_fd(self):
'useful to use selectors with the process most meaningful fd'
return self.pv_proc.stderr
def progress_read(self):
line = self.pv_proc.stderr.readline()
if match := self._progress_re.search(line):
written_bytes = humanfriendly.parse_size(match.group(1))
self.last_progress = Progress(
written_bytes,
int(100 * written_bytes / self.src_size),
humanfriendly.parse_size(match.group(2)),
match.group(3),
)
return self.last_progress
def terminate(self):
for proc in (self.pv_proc, self.zip_proc, self.tar_proc):
proc.terminate()
def poll(self):
'returns None if not terminated, otherwise return returncode'
return self.tar_proc.poll()
def wait(self, timeout=None):
self.pv_proc.wait(timeout)
self.zip_proc.wait(timeout)
return self.tar_proc.wait(timeout)
def __enter__(self):
return self
def __exit__(self, exc_type, value, traceback):
self.terminate()
self.wait()
if __name__ == '__main__':
import sys
import contextlib
with contextlib.suppress(KeyboardInterrupt):
with Extract(sys.argv[1], sys.argv[2]) as extract:
while extract.poll() is None:
progress = extract.progress_read()
print(f'{progress.bytes}b {progress.percent}% '
f'{progress.speed}b/s {progress.eta}')
rc = extract.poll()
print(f'ended with code: {rc}')
print('test main ended')
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