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Mini Shell
Mini Shell
#!/usr/bin/env python
"""
UC1541 Virtual filesystem
Author: Roman 'gryf' Dobosz <gryf73@gmail.com>
Date: 2019-09-20
Version: 3.3
Licence: BSD
source: https://bitbucket.org/gryf/uc1541
mirror: https://github.com/gryf/uc1541
"""
import sys
import re
import os
import gzip
from subprocess import Popen, PIPE
if os.getenv('UC1541_DEBUG'):
import logging
LOG = logging.getLogger('UC1541')
LOG.setLevel(logging.DEBUG)
FILE_HANDLER = logging.FileHandler("/tmp/uc1541.log")
FILE_FORMATTER = logging.Formatter("%(asctime)s %(levelname)-8s "
"%(lineno)s %(funcName)s - %(message)s")
FILE_HANDLER.setFormatter(FILE_FORMATTER)
FILE_HANDLER.setLevel(logging.DEBUG)
LOG.addHandler(FILE_HANDLER)
else:
class LOG(object):
"""
Dummy logger object. Does nothing.
"""
@classmethod
def debug(*args, **kwargs):
pass
@classmethod
def info(*args, **kwargs):
pass
@classmethod
def warning(*args, **kwargs):
pass
@classmethod
def error(*args, **kwargs):
pass
@classmethod
def critical(*args, **kwargs):
pass
SECLEN = 256
def _ord(string_or_int):
"""
Return an int value for the (possible) string passed in argument. This
function is for compatibility between python2 and python3, where single
element in byte string array is a string or an int respectively.
"""
try:
return ord(string_or_int)
except TypeError:
return string_or_int
def _get_raw(dimage):
"""
Try to get contents of the D64 image either it's gzip compressed or not.
"""
raw = None
with gzip.open(dimage, 'rb') as fobj:
# Although the common approach with gzipped files is to check the
# magic number, in this case there is no guarantee that first track
# does not contain exactly the same byte sequence as the magic number.
# So the only way left is to actually try to uncompress the file.
try:
raw = fobj.read()
except (IOError, OSError):
pass
if not raw:
with open(dimage, 'rb') as fobj:
raw = fobj.read()
return raw
def _get_implementation(disk):
"""
Check the file under fname and return right class for creating an object
corresponding for the file
"""
len_map = {822400: D81, # 80 tracks
819200: D81, # 80 tracks, 3200 error bytes
349696: D71, # 70 tracks
351062: D71, # 70 tracks, 1366 error bytes
174848: D64, # usual d64 disc image, 35 tracks, no errors
175531: D64, # 35 track, 683 error bytes
196608: D64, # 40 track, no errors
197376: D64} # 40 track, 768 error bytes
if disk[:32].startswith(b'C64'):
return # T64
return len_map.get(len(disk))(disk)
class Disk(object):
"""
Represent common disk interface
"""
CHAR_MAP = {32: ' ', 33: '!', 34: '"', 35: '#', 37: '%', 38: '&', 39: "'",
40: '(', 41: ')', 42: '*', 43: '+', 44: ',', 45: '-', 46: '.',
47: '/', 48: '0', 49: '1', 50: '2', 51: '3', 52: '4', 53: '5',
54: '6', 55: '7', 56: '8', 57: '9', 59: ';', 60: '<', 61: '=',
62: '>', 63: '?', 64: '@', 65: 'a', 66: 'b', 67: 'c', 68: 'd',
69: 'e', 70: 'f', 71: 'g', 72: 'h', 73: 'i', 74: 'j', 75: 'k',
76: 'l', 77: 'm', 78: 'n', 79: 'o', 80: 'p', 81: 'q', 82: 'r',
83: 's', 84: 't', 85: 'u', 86: 'v', 87: 'w', 88: 'x', 89: 'y',
90: 'z', 91: '[', 93: ']', 97: 'A', 98: 'B', 99: 'C',
100: 'D', 101: 'E', 102: 'F', 103: 'G', 104: 'H', 105: 'I',
106: 'J', 107: 'K', 108: 'L', 109: 'M', 110: 'N', 111: 'O',
112: 'P', 113: 'Q', 114: 'R', 115: 'S', 116: 'T', 117: 'U',
118: 'V', 119: 'W', 120: 'X', 121: 'Y', 122: 'Z', 193: 'A',
194: 'B', 195: 'C', 196: 'D', 197: 'E', 198: 'F', 199: 'G',
200: 'H', 201: 'I', 202: 'J', 203: 'K', 204: 'L', 205: 'M',
206: 'N', 207: 'O', 208: 'P', 209: 'Q', 210: 'R', 211: 'S',
212: 'T', 213: 'U', 214: 'V', 215: 'W', 216: 'X', 217: 'Y',
218: 'Z'}
FILE_TYPES = {0b000: 'del',
0b001: 'seq',
0b010: 'prg',
0b011: 'usr',
0b100: 'rel'}
DIR_TRACK = 18
DIR_SECTOR = 1
def __init__(self, raw):
"""
Init
"""
self.raw = raw
self.current_sector_data = None
self.next_sector = 0
self.next_track = None
self._dir_contents = []
self._already_done = []
def _map_filename(self, string):
"""
Transcode filename to ASCII compatible. Replace not supported
characters with jokers.
"""
filename = list()
for chr_ in string:
if _ord(chr_) == 160: # shift+space character; $a0
break
character = D64.CHAR_MAP.get(_ord(chr_), '?')
filename.append(character)
# special cases
if filename[0] == "-":
filename[0] = "?"
LOG.debug("string: ``%s'' mapped to: ``%s''", string,
"".join(filename))
return "".join(filename)
def _go_to_next_sector(self):
"""
Fetch (if exist) next sector from a directory chain
Return False if the chain ends, True otherwise
"""
# Well, self.next_sector _should_ have value $FF, but apparently there
# are the cases where it is not, therefore checking for that will not
# be performed and value of $00 on the next track will end the
# directory
if self.next_track == 0:
LOG.debug("End of directory")
return False
if self.next_track is None:
LOG.debug("Going to the track: %s, %s", self.DIR_TRACK,
self.DIR_SECTOR)
offset = self._get_offset(self.DIR_TRACK, self.DIR_SECTOR)
else:
offset = self._get_offset(self.next_track, self.next_sector)
LOG.debug("Going to the track: %s,%s", self.next_track,
self.next_sector)
self.current_sector_data = self.raw[offset:offset + SECLEN]
# Guard for reading data out of bound - that happened for discs which
# store only raw data, even on directory track
if not self.current_sector_data:
return False
self.next_track = _ord(self.current_sector_data[0])
self.next_sector = _ord(self.current_sector_data[1])
if (self.next_track, self.next_sector) in self._already_done:
# Just a failsafe. Endless loop is not what is expected.
LOG.debug("Loop in track/sector pointer at %d,%d",
self.next_track, self.next_sector)
self._already_done = []
return False
self._already_done.append((self.next_track, self.next_sector))
LOG.debug("Next track: %s,%s", self.next_track, self.next_sector)
return True
def _get_ftype(self, num):
"""
Get filetype as a string
"""
return D64.FILE_TYPES.get(int("%d%d%d" % (num & 4 and 1,
num & 2 and 1,
num & 1), 2), '???')
def _get_offset(self, track, sector):
"""
Return offset (in bytes) for specified track and sector.
"""
return 0
def _harvest_entries(self):
"""
Traverse through sectors and store entries in _dir_contents
"""
sector = self.current_sector_data
for dummy in range(8):
entry = sector[:32]
ftype = _ord(entry[2])
if ftype == 0: # deleted
sector = sector[32:]
continue
type_verbose = self._get_ftype(ftype)
protect = _ord(entry[2]) & 64 and "<" or " "
fname = entry[5:21]
if ftype == 'rel':
size = _ord(entry[23])
else:
size = _ord(entry[30]) + _ord(entry[31]) * 226
self._dir_contents.append({'fname': self._map_filename(fname),
'ftype': type_verbose,
'size': size,
'protect': protect})
sector = sector[32:]
def list_dir(self):
"""
Return directory list as list of dict with keys:
fname, ftype, protect and size
"""
while self._go_to_next_sector():
self._harvest_entries()
return self._dir_contents
class D64(Disk):
"""
Implement d64 directory reader
"""
def _get_offset(self, track, sector):
"""
Return offset (in bytes) for specified track and sector.
Track Sectors/track # Tracks
----- ------------- ---------
1-17 21 17
18-24 19 7
25-30 18 6
31-40 17 10
"""
offset = 0
truncate_track = 0
if track > 17:
offset = 17 * 21 * SECLEN
truncate_track = 17
if track > 24:
offset += 7 * 19 * SECLEN
truncate_track = 24
if track > 30:
offset += 6 * 18 * SECLEN
truncate_track = 30
track = track - truncate_track
offset += track * sector * SECLEN
return offset
class D71(Disk):
"""
Implement d71 directory reader
"""
def _get_offset(self, track, sector):
"""
Return offset (in bytes) for specified track and sector.
Track Sec/trk # Tracks
-------------- ------- ---------
1-17 (side 0) 21 17
18-24 (side 0) 19 7
25-30 (side 0) 18 6
31-35 (side 0) 17 5
36-52 (side 1) 21 17
53-59 (side 1) 19 7
60-65 (side 1) 18 6
66-70 (side 1) 17 5
"""
offset = 0
truncate_track = 0
if track > 17:
offset = 17 * 21 * SECLEN
truncate_track = 17
if track > 24:
offset += 7 * 19 * SECLEN
truncate_track = 24
if track > 30:
offset += 6 * 18 * SECLEN
truncate_track = 30
if track > 35:
offset += 5 * 17 * SECLEN
truncate_track = 35
if track > 52:
offset = 17 * 21 * SECLEN
truncate_track = 17
if track > 59:
offset += 7 * 19 * SECLEN
truncate_track = 24
if track > 65:
offset += 6 * 18 * SECLEN
truncate_track = 30
track = track - truncate_track
offset += track * sector * SECLEN
return offset
class D81(Disk):
"""
Implement d81 directory reader
"""
DIR_TRACK = 40
DIR_SECTOR = 3
FILE_TYPES = {0b000: 'del',
0b001: 'seq',
0b010: 'prg',
0b011: 'usr',
0b100: 'rel',
0b101: 'cbm'}
def _get_offset(self, track, sector):
"""
Return offset (in bytes) for specified track and sector. In d81 is
easy, since we have 80 tracks with 40 sectors for 256 bytes each.
"""
# we wan to go to the beginning (first sector) of the track, not it's
# max, so that we need to extract its amount.
return (track * 40 - 40) * SECLEN + sector * SECLEN
class Uc1541(object):
"""
Class for interact with c1541 program and MC
"""
PRG = re.compile(r'(\d+)\s+"([^"]*)".+?\s(del|prg|rel|seq|usr)([\s<])')
def __init__(self, archname):
self.arch = archname
self.out = ''
self.err = ''
self._verbose = os.getenv("UC1541_VERBOSE", False)
self._hide_del = os.getenv("UC1541_HIDE_DEL", False)
self.dirlist = _get_implementation(_get_raw(archname)).list_dir()
self.file_map = {}
self.directory = []
def list(self):
"""
Output list contents of D64 image.
Convert filenames to be Unix filesystem friendly
Add suffix to show user what kind of file do he dealing with.
"""
LOG.info("List contents of %s", self.arch)
directory = self._get_dir()
# If there is an error reading directory, show the reason to the user
if self.out.startswith("Error"):
sys.stderr.write(self.out.split("\n")[0] + "\n")
return 2
for entry in directory:
sys.stdout.write("%(perms)s 1 %(uid)-8d %(gid)-8d %(size)8d "
"Jan 01 1980 %(display_name)s\n" % entry)
return 0
def rm(self, dst):
"""
Remove file from D64 image
"""
LOG.info("Removing file %s", dst)
dst = self._get_masked_fname(dst)
if not self._call_command('delete', dst=dst):
return self._show_error()
return 0
def copyin(self, dst, src):
"""
Copy file to the D64 image. Destination filename has to be corrected.
"""
LOG.info("Copy into D64 %s as %s", src, dst)
dst = self._correct_fname(dst)
if not self._call_command('write', src=src, dst=dst):
return self._show_error()
return 0
def copyout(self, src, dst):
"""
Copy file form the D64 image. Source filename has to be corrected,
since it's representation differ from the real one inside D64 image.
"""
LOG.info("Copy form D64 %s as %s", src, dst)
if not src.endswith(".prg"):
return "cannot read"
src = self._get_masked_fname(src)
if not self._call_command('read', src=src, dst=dst):
return self._show_error()
return 0
def mkdir(self, dirname):
"""Not supported"""
self.err = "D64 format doesn't support directories"
return self._show_error()
def run(self, fname):
"""Not supported"""
self.err = "Not supported, unless you are using MC on real C64 ;)"
return self._show_error()
def _correct_fname(self, fname):
"""
Return filename with mapped characters, without .prg extension.
Characters like $, *, + in filenames are perfectly legal, but c1541
program seem to have issues with it while writing, so it will also be
replaced.
"""
char_map = {'|': "/",
"\\": "/",
"~": " ",
"$": "?",
"*": "?"}
if fname.lower().endswith(".prg"):
fname = fname[:-4]
new_fname = []
for char in fname:
trans = char_map.get(char)
new_fname.append(trans if trans else char)
return "".join(new_fname)
def _get_masked_fname(self, fname):
"""
Return masked filename with '?' jokers instead of non ASCII
characters, useful for copying or deleting files with c1541. In case
of several files with same name exists in directory, only first one
will be operative (first as appeared in directory).
Warning! If there are two different names but the only difference is in
non-ASCII characters (some PET ASCII or control characters) there is
a risk that one can remove both files.
"""
directory = self._get_dir()
for entry in directory:
if entry['display_name'] == fname:
return entry['pattern_name']
def _get_dir(self):
"""
Retrieve directory via c1541 program
"""
directory = []
uid = os.getuid()
gid = os.getgid()
if not self._call_command('list'):
return self._show_error()
idx = 0
for line in self.out.split("\n"):
if Uc1541.PRG.match(line):
blocks, fname, ext, rw = Uc1541.PRG.match(line).groups()
if ext == 'del' and self._hide_del:
continue
display_name = ".".join([fname, ext])
pattern_name = self.dirlist[idx]['fname']
if '/' in display_name:
display_name = display_name.replace('/', '|')
# workaround for space and dash at the beggining of the
# filename
char_map = {' ': '~',
'-': '_'}
display_name = "".join([char_map.get(display_name[0],
display_name[0]),
display_name[1:]])
if ext == 'del':
perms = "----------"
else:
perms = "-r%s-r--r--" % (rw.strip() and "-" or "w")
directory.append({'pattern_name': pattern_name,
'display_name': display_name,
'uid': uid,
'gid': gid,
'size': int(blocks) * SECLEN,
'perms': perms})
idx += 1
return directory
def _show_error(self):
"""
Pass out error output from c1541 execution
"""
if self._verbose:
return self.err
else:
return 1
def _call_command(self, cmd, src=None, dst=None):
"""
Return status of the provided command, which can be one of:
write
read
delete
dir/list
"""
command = ['c1541', '-attach', self.arch, '-%s' % cmd]
if src:
command.append(src)
if dst:
command.append(dst)
LOG.debug('executing command: %s', ' '.join(command))
# For some reason using write and delete commands and reading output
# confuses Python3 beneath MC and as a consequence MC report an
# error...therefore for those commands let's not use
# universal_newlines...
universal_newlines = True
if cmd in ['delete', 'write']:
universal_newlines = False
self.out, self.err = Popen(command,
universal_newlines=universal_newlines,
stdout=PIPE, stderr=PIPE).communicate()
if self.err:
LOG.debug('an err: %s', self.err)
return not self.err
CALL_MAP = {'list': lambda a: Uc1541(a.arch).list(),
'copyin': lambda a: Uc1541(a.arch).copyin(a.src, a.dst),
'copyout': lambda a: Uc1541(a.arch).copyout(a.src, a.dst),
'mkdir': lambda a: Uc1541(a.arch).mkdir(a.dst),
'rm': lambda a: Uc1541(a.arch).rm(a.dst),
'run': lambda a: Uc1541(a.arch).run(a.dst)}
def parse_args():
"""Use ArgumentParser to check for script arguments and execute."""
parser = ArgumentParser()
subparsers = parser.add_subparsers(help='supported commands',
dest='subcommand')
subparsers.required = True
parser_list = subparsers.add_parser('list', help="List contents of D64 "
"image")
parser_copyin = subparsers.add_parser('copyin', help="Copy file into D64 "
"image")
parser_copyout = subparsers.add_parser('copyout', help="Copy file out of "
"D64 image")
parser_rm = subparsers.add_parser('rm', help="Delete file from D64 image")
parser_mkdir = subparsers.add_parser('mkdir', help="Create directory in "
"archive")
parser_run = subparsers.add_parser('run', help="Execute archived file")
parser_list.add_argument('arch', help="D64 Image filename")
parser_list.set_defaults(func=CALL_MAP['list'])
parser_copyin.add_argument('arch', help="D64 Image filename")
parser_copyin.add_argument('src', help="Source filename")
parser_copyin.add_argument('dst', help="Destination filename (to be "
"written into D64 image)")
parser_copyin.set_defaults(func=CALL_MAP['copyin'])
parser_copyout.add_argument('arch', help="D64 Image filename")
parser_copyout.add_argument('src', help="Source filename (to be read from"
" D64 image")
parser_copyout.add_argument('dst', help="Destination filename")
parser_copyout.set_defaults(func=CALL_MAP['copyout'])
parser_rm.add_argument('arch', help="D64 Image filename")
parser_rm.add_argument('dst', help="File inside D64 image to be deleted")
parser_rm.set_defaults(func=CALL_MAP['rm'])
parser_mkdir.add_argument('arch', help="archive filename")
parser_mkdir.add_argument('dst', help="Directory name inside archive to "
"be created")
parser_mkdir.set_defaults(func=CALL_MAP['mkdir'])
parser_run.add_argument('arch', help="archive filename")
parser_run.add_argument('dst', help="File to be executed")
parser_run.set_defaults(func=CALL_MAP['run'])
args = parser.parse_args()
return args.func(args)
def no_parse():
"""Failsafe argument "parsing". Note, that it blindly takes positional
arguments without checking them. In case of wrong arguments it will
silently exit"""
try:
if sys.argv[1] not in ('list', 'copyin', 'copyout', 'rm', 'mkdir',
"run"):
sys.exit(2)
except IndexError:
sys.exit(2)
class Arg(object):
"""Mimic argparse object"""
dst = None
src = None
arch = None
arg = Arg()
try:
arg.arch = sys.argv[2]
if sys.argv[1] in ('copyin', 'copyout'):
arg.src = sys.argv[3]
arg.dst = sys.argv[4]
elif sys.argv[1] in ('rm', 'run', 'mkdir'):
arg.dst = sys.argv[3]
except IndexError:
sys.exit(2)
return CALL_MAP[sys.argv[1]](arg)
if __name__ == "__main__":
LOG.debug("Script params: %s", str(sys.argv))
try:
from argparse import ArgumentParser
PARSE_FUNC = parse_args
except ImportError:
PARSE_FUNC = no_parse
sys.exit(PARSE_FUNC())
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