Drop Python2 support.

Starting from beginning of 2020 Python 2.7 is no longer supported[1],
hence the change of shebang for uc1541 script and removal of _ord
function.

[1] https://devguide.python.org/versions/

LICENSE

@@ -0,0 +1,24 @@
+Copyright (c) 2015, Roman Dobosz
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the organization nor the names of its contributors
+      may be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+DISCLAIMED. IN NO EVENT SHALL ROMAN DOBOSZ BE LIABLE FOR ANY DIRECT, INDIRECT, 
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.rst

@@ -0,0 +1,130 @@
+===================================================
+Midnight Commander virtual filesystem for C64 disks
+===================================================
+
+This extfs provides an access to disk image files for the Commodore
+VIC20/C64/C128 for Midnight Commander. It requires the utility c1541 that comes
+bundled with Vice, the emulator for the VIC20, C64, C128 and other computers
+made by Commodore.
+
+Features
+========
+
+* View, remove, copy files in and out of the image,
+* Support for read from and write to d64, d71 and d81 images,
+* Gzipped disk images support,
+* On fly characters remapping (see below).
+
+Remarks
+=======
+
+Due to different way of representing file entries on regular Commodore disk
+images, there could be issues with filenames that are transfered from/to the
+image. Following rules was applied to represent a single file entry:
+
+1. An extension is attached to the end of a filename depending on a file type.
+   Possible extensions are: ``prg``, ``del``, ``seq``, ``usr`` and ``rel``.
+2. Every non-ASCII character (which could be some of characters specific to
+   PET-ASCII, or be a control character) will be replaced by dot (``.``), since
+   ``c1541`` program will list them that way.
+3. Every slash character (``/``) will be replaced by pipe character (``|``).
+4. Leading space will be replaced by tilda (``~``).
+
+While copying from disk image to filesystem, filenames will be stored as they
+are seen on a listing.
+
+While copying from filesystem to disk image, filename conversion will be done:
+
+1. Every ``$`` and ``*`` characters will be replaced by question mark (``?``)
+2. Every pipe (``|``) and backslash (``\``) characters will be replaced by
+   slash (``/``)
+3. Every tilde (``~``) will be replaced by a space
+4. ``prg`` extension will be truncated
+
+Representation of a directory can be sometimes confusing - in case when one
+copied file without extension it stays there in such form, till next access
+(after flushing VFS). Also file sizes are not accurate, since directory entries
+in CBM format have sizes stored as 256 bytes blocks.
+
+Screens below shows how it looks like on real C64 machine and its representation
+on Midnight Commander listing.
+
+|image1| |image2|
+
+In ``media`` directory you can find the ``test.d6z`` gzip compressed D64 image
+file.
+
+Rquirements
+===========
+
+* Python 3.6 or higher (checked recently with 3.11)
+* Vice installation (c1541 program in path)
+
+Installation
+============
+
+* copy ``uc1541`` to ``~/.local/share/mc/extfs.d/``
+* add or change entry for files handle in ``~/.config/mc/mc.ext``::
+
+    # Disk images for Commodore computers (VIC20, C64, C128)
+    regex/\.([dD]64|[dD]6[zZ]|[dD]71|[dD]7[zZ]|[dD]81|[dD]8[zZ])$
+        Open=%cd %p/uc1541://
+        View=%view{ascii} c1541 %f -list
+        Extract=c1541 %f -extract
+
+Configuration
+=============
+
+Here are specific for this script variable, which while set, can influence
+script behaviour:
+
+* ``UC1541_DEBUG`` - if set, uc1541 will produce log in /tmp/uc1541.log file.
+* ``UC1541_VERBOSE`` - if set, script will be more verbose, i.e. error messages
+  form c1541 program will be passed to Midnight Commander, so that user will be
+  aware of error cause if any.
+* ``UC1541_HIDE_DEL`` - if set, no DEL entries will be shown.
+
+Changelog
+=========
+
+* **3.5** Drop Python2 support.
+* **3.4** Code cleanup. Removed dummy logger class and sys.args based argument
+  parsing.
+* **3.3** Added support for .d71 and .d81 disk images.
+* **3.2** Changed shebang to ``python`` executable instead of ``python3``
+* **3.1** Argparse on Python3 have different behaviour, where if no subcommand
+  is provided, it will pass anyway. Fixed.
+* **3.0** Added beta quality Python3 support
+* **2.8** Treat non standard discs a bit better
+* **2.7** Added support for gzipped disk images
+* **2.6** Added mkdir and run handling (or rather lack of handling :). Minor
+  refactoring.
+* **2.5** Fixed bug with filenames started with a '-' sign.
+* **2.4** Fixed endless loop bug for reading directory in Python implemented
+  directory reader.
+* **2.3** Re added and missing method _correct_fname used for writing files
+  into d64 image.
+* **2.2** Fixed bug(?) with unusual sector end (marked as sector 0, not 255),
+  causing endless directory reading on random locations.
+* **2.1** Fixed bug with filenames containing slash.
+* **2.0** Added reading raw D64 image, and mapping for jokers. Now it is
+  possible to read files with PET-ASCII/control sequences in filenames. Working
+  with d64 images only. Added workaround for space at the beginning of the
+  filename.
+* **1.2** Added configuration env variables: ``UC1541_VERBOSE`` and
+  ``UC1541_HIDE_DEL``.  First one, if set to any value, will cause that error
+  messages from ``c1541`` program will be redirected as a failure messages
+  visible in MC.
+  The other variable, when set to any value, cause *del* entries to be not
+  shown in the lister.
+* **1.1** Added protect bits, added failsafe for ``argparse`` module
+* **1.0** Initial release
+
+License
+=======
+
+This software is licensed under 3-clause BSD license. See LICENSE file for
+details.
+
+.. |image1| image:: /media/vice_dir.png?raw=true
+.. |image2| image:: /media/mc.png?raw=true

uc1541

@@ -1,88 +1,25 @@
-#! /usr/bin/env python
+#!/usr/bin/env python3
 """
 UC1541 Virtual filesystem
 
-This extfs provides an access to disk image files for the Commodore
-VIC20/C64/C128. It requires the utility c1541 that comes bundled with Vice,
-the emulator for the VIC20, C64, C128 and other computers made by Commodore.
-
-Remarks
--------
-
-Due to different way of representing file entries on regular D64 disk images,
-there could be issues with filenames that are transfered from/to the image.
-Following rules was applied to represent a single file entry:
-
-1. An extension is attached to the end of a filename depending on a file type.
-   Possible extensions are: prg, del, seq, usr and rel.
-2. Every non-ASCII character (which could be some of characters specific to
-   PET-ASCII, or be a control character) will be replaced by dot (.), since
-   c1541 program will list them that way.
-3. Every slash character (/) will be replaced by pipe character (|).
-4. Leading space will be replaced by tilda (~).
-
-While copying from D64 image to filesystem, filenames will be stored as they
-are seen on a listing.
-
-While copying from filesystem to D64 image, filename conversion will be done:
-1. Every $ and * characters will be replaced by question mark (?)
-2. Every pipe (|) and backslash (\) characters will be replaced by slash (/)
-3. Every tilda (~) will be replaced by a space
-4. 'prg' extension will be truncated
-
-Representation of a directory can be sometimes confusing - in case when one
-copied file without extension it stays there in such form, till next access
-(after flushing VFS). Also file sizes are not accurate, since D64 directory
-entries have sizes stored as 256 bytes blocks.
-
-Configuration
--------------
-
-Here are specific for this script variable, which while set, can influence
-script behaviour:
-
-UC1541_DEBUG - if set, uc1541 will produce log in /tmp/uc1541.log file
-
-UC1541_VERBOSE - of set, script will be more verbose, i.e. error messages form
-c1541 program will be passed to Midnight Commander, so that user will be aware
-of error cause if any.
-
-UC1541_HIDE_DEL - if set, no DEL entries will be shown
-
-Changelog:
-    2.4 Fixed endless loop bug for reading directory in Python implemented
-        directory reader.
-    2.3 Re added and missing method _correct_fname used for writing files
-        into d64 image.
-    2.2 Fixed bug(?) with unusual sector end (marked as sector 0, not 255),
-        causing endless directory reading on random locations.
-    2.1 Fixed bug with filenames containing slash.
-    2.0 Added reading raw D64 image, and mapping for jokers. Now it is
-        possible to read files with PET-ASCII/control sequences in filenames.
-        Working with d64 images only. Added workaround for space at the
-        beggining of the filename.
-    1.2 Added configuration env variables: UC1541_VERBOSE and UC1541_HIDE_DEL.
-        First one, if set to any value, will cause that error messages from
-        c1541 program will be redirected as a failure messages visible in MC.
-        The other variable, when set to any value, cause "del" entries to be
-        not shown in the lister.
-    1.1 Added protect bits, added failsafe for argparse module
-    1.0 Initial release
-
 Author: Roman 'gryf' Dobosz <gryf73@gmail.com>
-Date: 2012-09-30
-Version: 2.4
+Date: 2023-10-04
+Version: 3.5
 Licence: BSD
+source: https://bitbucket.org/gryf/uc1541
+mirror: https://github.com/gryf/uc1541
 """
-
-import sys
-import re
+import argparse
+import gzip
+import logging
 import os
-from subprocess import Popen, PIPE
+import re
+import subprocess
+import sys
 
+
+LOG = logging.getLogger('UC1541')
 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 "
@@ -90,35 +27,55 @@ if os.getenv('UC1541_DEBUG'):
     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
 
 
-class D64(object):
+SECLEN = 256
+
+
+def _get_raw(dimage):
     """
-    Implement d64 directory reader
+    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: '.',
@@ -145,15 +102,14 @@ class D64(object):
                   0b011: 'usr',
                   0b100: 'rel'}
 
-    def __init__(self, dimage):
+    DIR_TRACK = 18
+    DIR_SECTOR = 1
+
+    def __init__(self, raw):
         """
         Init
         """
-        LOG.debug('image: %s', dimage)
-        dimage = open(dimage, 'rb')
-        self.raw = dimage.read()
-        dimage.close()
-
+        self.raw = raw
         self.current_sector_data = None
         self.next_sector = 0
         self.next_track = None
@@ -169,12 +125,16 @@ class D64(object):
         filename = list()
 
         for chr_ in string:
-            if ord(chr_) == 160:  # shift+space character; $a0
+            if chr_ == 160:  # shift+space character; $a0
                 break
 
-            character = D64.CHAR_MAP.get(ord(chr_), '?')
+            character = D64.CHAR_MAP.get(chr_, '?')
             filename.append(character)
 
+        # special cases
+        if filename[0] == "-":
+            filename[0] = "?"
+
         LOG.debug("string: ``%s'' mapped to: ``%s''", string,
                   "".join(filename))
         return "".join(filename)
@@ -194,17 +154,23 @@ class D64(object):
             return False
 
         if self.next_track is None:
-            LOG.debug("Going to the track: 18,1")
-            offset = self._get_d64_offset(18, 1)
+            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_d64_offset(self.next_track, self.next_sector)
+            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 + 256]
+        self.current_sector_data = self.raw[offset:offset + SECLEN]
 
-        self.next_track = ord(self.current_sector_data[0])
-        self.next_sector = ord(self.current_sector_data[1])
+        # 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 = self.current_sector_data[0]
+        self.next_sector = 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.
@@ -225,39 +191,20 @@ class D64(object):
                                                   num & 2 and 1,
                                                   num & 1), 2), '???')
 
-    def _get_d64_offset(self, track, sector):
+    def _get_offset(self, track, sector):
         """
         Return offset (in bytes) for specified track and sector.
         """
-
-        offset = 0
-        truncate_track = 0
-
-        if track > 17:
-            offset = 17 * 21 * 256
-            truncate_track = 17
-
-        if track > 24:
-            offset += 6 * 19 * 256
-            truncate_track = 24
-
-        if track > 30:
-            offset += 5 * 18 * 256
-            truncate_track = 30
-
-        track = track - truncate_track
-        offset += track * sector * 256
-
-        return offset
+        return 0
 
     def _harvest_entries(self):
         """
         Traverse through sectors and store entries in _dir_contents
         """
         sector = self.current_sector_data
-        for x in range(8):
+        for dummy in range(8):
             entry = sector[:32]
-            ftype = ord(entry[2])
+            ftype = entry[2]
 
             if ftype == 0:  # deleted
                 sector = sector[32:]
@@ -265,12 +212,12 @@ class D64(object):
 
             type_verbose = self._get_ftype(ftype)
 
-            protect = ord(entry[2]) & 64 and "<" or " "
+            protect = entry[2] & 64 and "<" or " "
             fname = entry[5:21]
             if ftype == 'rel':
-                size = ord(entry[23])
+                size = entry[23]
             else:
-                size = ord(entry[30]) + ord(entry[31]) * 226
+                size = entry[30] + entry[31] * 226
 
             self._dir_contents.append({'fname': self._map_filename(fname),
                                        'ftype': type_verbose,
@@ -289,6 +236,123 @@ class D64(object):
         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
@@ -302,7 +366,7 @@ class Uc1541(object):
         self._verbose = os.getenv("UC1541_VERBOSE", False)
         self._hide_del = os.getenv("UC1541_HIDE_DEL", False)
 
-        self.pyd64 = D64(archname).list_dir()
+        self.dirlist = _get_implementation(_get_raw(archname)).list_dir()
         self.file_map = {}
         self.directory = []
 
@@ -315,6 +379,11 @@ class Uc1541(object):
         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)
@@ -326,19 +395,7 @@ class Uc1541(object):
         """
         LOG.info("Removing file %s", dst)
         dst = self._get_masked_fname(dst)
-
-        if not self._call_command('delete', dst=dst):
-            return self._show_error()
-
-        # During removing, a message containing ERRORCODE is sent to stdout
-        # instead of stderr. Everything other than 'ERRORCODE 1' (which means:
-        # 'everything fine') is actually a failure. In case of verbose error
-        # output it is needed to copy self.out to self.err.
-        if '\nERRORCODE 1\n' not in self.out:
-            self.err = self.out
-            return self._show_error()
-
-        return 0
+        return self._call_command('delete', dst=dst)
 
     def copyin(self, dst, src):
         """
@@ -346,11 +403,7 @@ class Uc1541(object):
         """
         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
+        return self._call_command('write', src=src, dst=dst)
 
     def copyout(self, src, dst):
         """
@@ -363,10 +416,17 @@ class Uc1541(object):
 
         src = self._get_masked_fname(src)
 
-        if not self._call_command('read', src=src, dst=dst):
-            return self._show_error()
+        return self._call_command('read', src=src, dst=dst)
 
-        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):
         """
@@ -417,8 +477,9 @@ class Uc1541(object):
         uid = os.getuid()
         gid = os.getgid()
 
-        if not self._call_command('list'):
-            return self._show_error()
+        res = self._call_command('list')
+        if res != 0:
+            return res
 
         idx = 0
         for line in self.out.split("\n"):
@@ -429,14 +490,18 @@ class Uc1541(object):
                     continue
 
                 display_name = ".".join([fname, ext])
-                pattern_name = self.pyd64[idx]['fname']
+                pattern_name = self.dirlist[idx]['fname']
 
                 if '/' in display_name:
                     display_name = display_name.replace('/', '|')
 
-                # workaround for space at the beggining of the filename
-                if display_name[0] == ' ':
-                    display_name = '~' + display_name[1:]
+                # 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 = "----------"
@@ -447,7 +512,7 @@ class Uc1541(object):
                                   'display_name': display_name,
                                   'uid': uid,
                                   'gid': gid,
-                                  'size': int(blocks) * 256,
+                                  'size': int(blocks) * SECLEN,
                                   'perms': perms})
                 idx += 1
         return directory
@@ -457,9 +522,9 @@ class Uc1541(object):
         Pass out error output from c1541 execution
         """
         if self._verbose:
-            sys.exit(self.err)
+            return self.err
         else:
-            sys.exit(1)
+            return 1
 
     def _call_command(self, cmd, src=None, dst=None):
         """
@@ -470,29 +535,45 @@ class Uc1541(object):
             dir/list
         """
         command = ['c1541', '-attach', self.arch, '-%s' % cmd]
-        if src and dst:
+        if src:
             command.append(src)
+        if dst:
             command.append(dst)
-        elif src or dst:
-            command.append(src and src or dst)
 
-        self.out, self.err = Popen(command, stdout=PIPE,
-                                   stderr=PIPE).communicate()
-        return not self.err
+        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) = subprocess.Popen(command,
+                                      universal_newlines=universal_newlines,
+                                      stdout=subprocess.PIPE,
+                                      stderr=subprocess.PIPE).communicate()
+
+        if self.err:
+            LOG.debug('an err: %s', self.err)
+            return self._show_error()
+        return 0
 
 
-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),
-            'rm': lambda a: Uc1541(a.ARCH).rm(a.DST)}
+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')
+    """Use ArgumentParser to check for script arguments and execute."""
+    parser = argparse.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 "
@@ -500,67 +581,42 @@ def parse_args():
     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.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 "
+    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"
+    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.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.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'):
-            sys.exit(2)
-    except IndexError:
-        sys.exit(2)
-
-    class Arg(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] == 'rm':
-            arg.DST = sys.argv[3]
-    except IndexError:
-        sys.exit(2)
-
-    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
-
-    parse_func()
+    sys.exit(parse_args())