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import os
import re
import struct
import subprocess
import humanfriendly
from ..structures import Progress
from .runnerbase import RunnerBase, neutral_locale_variables
class Extract(RunnerBase):
_progress_re = re.compile(r'^\s*(\S+)\s+\[([^]]+)/s\]\s+ETA\s+(\S+)\s*$')
def __init__(self, src, dst):
import sys
print('src', src, 'dst', dst, file=sys.stderr)
common_parameters = dict(
encoding='utf8',
env={**os.environ,
**neutral_locale_variables,
},
)
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'
uncompress_command_to_use = [lzip_command, '--decompress']
first_word_magic = 0
with open(src, 'rb') as stream:
first_word_magic = struct.unpack('>L', stream.read(4))[0]
if first_word_magic == 0x4c5a4950: # lzip magic
if os.path.exists(plzip_command):
uncompress_command_to_use = [plzip_command, '--decompress']
elif first_word_magic == 0x28B52FFD:
uncompress_command_to_use = ['zstd', '-T0', '-d', '--stdout']
self.zip_proc = subprocess.Popen(
uncompress_command_to_use,
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 get_read_fd(self):
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(
nbbytes=written_bytes,
percent=int(100 * written_bytes / self.src_size),
speed=humanfriendly.parse_size(match.group(2)),
eta=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):
return self.tar_proc.poll()
def close(self):
self.pv_proc.wait()
self.zip_proc.wait()
self.tar_proc.wait()
if __name__ == '__main__':
import contextlib
import sys
with contextlib.suppress(KeyboardInterrupt):
with Extract(sys.argv[1], sys.argv[2]) as runner:
while runner.poll() is None:
print(runner.progress_read())
rc = runner.poll()
print('ended with code:', rc)
print('test main ended')
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