138 lines
4.2 KiB
Python
Executable File
138 lines
4.2 KiB
Python
Executable File
#!/usr/bin/env python3
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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 3.6, unlzx[1] 1.1 and mc 4.8.22
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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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1.2 Use python3
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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: 2019-06-30
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Version: 1.2
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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(b"^\s+(?P<size>\d+)\s+"
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b"((n/a)|\d+)\s"
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b"(?P<time>\d{2}:\d{2}:\d{2})\s+"
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b"(?P<date>\d+-[a-z]{3}-\d{4})\s"
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b"(?P<perms>[h-][s-][p-][a-][r-][w-][e-][d-])\s"
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b"\"(?P<fpath>.*)\"")
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ARCHIVER = b"unlzx"
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CMDS = {"list": b"-v",
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"read": b"-x"}
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DATETIME = b"%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 = [b"jan", b"feb", b"mar", b"apr", b"may", b"jun", b"jul",
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b"aug", b"sep", b"oct", b"nov", b"dec"]
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day, month, year = date.split(b"-")
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month = month_list.index(month) + 1
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hours, minutes, dummy = time.split(b":")
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return self.DATETIME % (month, int(day), year, int(hours),
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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(b"\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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match_entry = match.groupdict()
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entry = {}
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for key in match_entry:
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entry[bytes(key, 'utf-8')] = match_entry[key]
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del match_entry
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entry[b'datetime'] = self._get_date(entry[b'time'], entry[b'date'])
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entry[b'display_name'] = self._map_name(entry[b'fpath'])
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entry[b'perms'] = b"-rw-r--r--" # lzx doesn't store empty dirs
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entry[b'uid'] = bytes(str(self._uid), 'utf-8')
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entry[b'gid'] = bytes(str(self._gid), 'utf-8')
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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.buffer.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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# use subprocess, as shutil.copy2 will complain about mixing
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# strings with bytes
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subprocess.run(['cp', 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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