129 lines
3.8 KiB
Python
Executable File
129 lines
3.8 KiB
Python
Executable File
#! /usr/bin/env python
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"""
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Read only, Amiga LZX[1] archiver Virtual filesystem executive for Midnight
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Commander.
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Tested against python 2.7, unlzx[1] 1.1 and mc 4.8.7
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[1] ftp://us.aminet.net/pub/aminet/misc/unix/unlzx.c.gz.readme
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Changelog:
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1.1 Moved common code into extfslib library
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1.0 Initial release
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Author: Roman 'gryf' Dobosz <gryf73@gmail.com>
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Date: 2013-05-12
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Version: 1.1
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Licence: BSD
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"""
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import os
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import sys
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import re
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import shutil
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from subprocess import call, CalledProcessError
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from tempfile import mkdtemp, mkstemp
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from extfslib import Archive, parse_args
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class ULzx(Archive):
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"""Archive handle. Provides interface to MC's extfs subsystem"""
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LINE_PAT = re.compile("^\s+(?P<size>\d+)\s+"
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"((n/a)|\d+)\s"
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"(?P<time>\d{2}:\d{2}:\d{2})\s+"
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"(?P<date>\d+-[a-z]{3}-\d{4})\s"
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"(?P<perms>[h-][s-][p-][a-][r-][w-][e-][d-])\s"
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"\"(?P<fpath>.*)\"")
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ARCHIVER = "unlzx"
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CMDS = {"list": "-v",
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"read": "-x"}
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DATETIME = "%02d-%02d-%s %02d:%02d"
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def _get_date(self, time, date):
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"""Return MM-DD-YYYY hh:mm formatted date out of time and date
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strings"""
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month_list = ["jan", "feb", "mar", "apr", "may", "jun", "jul", "aug",
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"sep", "oct", "nov", "dec"]
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day, month, year = date.split("-")
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month = month_list.index(month) + 1
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hours, minutes, dummy = time.split(":")
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return self.DATETIME % (month, int(day), year, int(hours), int(minutes))
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def _get_dir(self):
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"""Prepare archive file listing"""
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contents = []
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out = self._call_command("list")
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if not out:
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return
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for line in out.split("\n"):
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match = self.LINE_PAT.match(line)
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if not match:
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continue
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entry = match.groupdict()
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entry['datetime'] = self._get_date(entry['time'], entry['date'])
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entry['display_name'] = self._map_name(entry['fpath'])
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entry['perms'] = "-rw-r--r--" # lzx doesn't store empty dirs
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entry['uid'] = self._uid
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entry['gid'] = self._gid
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contents.append(entry)
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return contents
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def list(self):
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"""Output contents of the archive to stdout"""
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for entry in self._contents:
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sys.stdout.write(self.ITEM % entry)
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return 0
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def run(self, dst):
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"""Execute file out of archive"""
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fdesc, tmp_file = mkstemp()
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os.close(fdesc)
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result = 0
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if self.copyout(dst, tmp_file) != 0:
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result = 1
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os.chmod(tmp_file, int("700", 8))
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try:
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result = call([tmp_file])
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finally:
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try:
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os.unlink(tmp_file)
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except OSError:
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pass
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return result
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def copyout(self, src, dst):
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"""Unfortunately, to copy one file out entire LZX archive have to be
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extracted. For small archives is not a problem, but in relatively big
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one it could be a performance issue."""
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tmp_dir = mkdtemp()
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src = self._get_real_name(src)
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current_dir = os.path.abspath(os.curdir)
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os.chdir(tmp_dir)
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try:
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with open(os.devnull, "w") as fnull:
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result = call([self.ARCHIVER, self.CMDS['read'],
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os.path.join(current_dir, self._arch)],
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stdout=fnull, stderr=fnull)
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if result == 0:
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shutil.copy2(src, dst)
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except CalledProcessError:
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return 1
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finally:
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shutil.rmtree(tmp_dir)
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os.chdir(current_dir)
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return result
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if __name__ == "__main__":
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sys.exit(parse_args(ULzx))
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