From 31f0360f1fd4ebc9dfcaed42d1c50d2448b4632e Mon Sep 17 00:00:00 2001 From: Tom Zanussi Date: Sat, 24 Aug 2013 15:31:34 +0000 Subject: wic: Add mic w/pykickstart This is the starting point for the implemention described in [YOCTO 3847] which came to the conclusion that it would make sense to use kickstart syntax to implement image creation in OpenEmbedded. I subsequently realized that there was an existing tool that already implemented image creation using kickstart syntax, the Tizen/Meego mic tool. As such, it made sense to use that as a starting point - this commit essentially just copies the relevant Python code from the MIC tool to the scripts/lib dir, where it can be accessed by the previously created wic tool. Most of this will be removed or renamed by later commits, since we're initially focusing on partitioning only. Care should be taken so that we can easily add back any additional functionality should we decide later to expand the tool, though (we may also want to contribute our local changes to the mic tool to the Tizen project if it makes sense, and therefore should avoid gratuitous changes to the original code if possible). Added the /mic subdir from Tizen mic repo as a starting point: git clone git://review.tizen.org/tools/mic.git For reference, the top commit: commit 20164175ddc234a17b8a12c33d04b012347b1530 Author: Gui Chen Date: Sun Jun 30 22:32:16 2013 -0400 bump up to 0.19.2 Also added the /plugins subdir, moved to under the /mic subdir (to match the default plugin_dir location in mic.conf.in, which was renamed to yocto-image.conf (moved and renamed by later patches) and put into /scripts. Signed-off-by: Tom Zanussi Signed-off-by: Saul Wold Signed-off-by: Richard Purdie --- scripts/lib/mic/utils/BmapCreate.py | 298 ++++++ scripts/lib/mic/utils/Fiemap.py | 252 +++++ scripts/lib/mic/utils/__init__.py | 0 scripts/lib/mic/utils/cmdln.py | 1586 ++++++++++++++++++++++++++++++++ scripts/lib/mic/utils/errors.py | 71 ++ scripts/lib/mic/utils/fs_related.py | 1029 +++++++++++++++++++++ scripts/lib/mic/utils/gpt_parser.py | 331 +++++++ scripts/lib/mic/utils/grabber.py | 97 ++ scripts/lib/mic/utils/misc.py | 1067 +++++++++++++++++++++ scripts/lib/mic/utils/partitionedfs.py | 790 ++++++++++++++++ scripts/lib/mic/utils/proxy.py | 183 ++++ scripts/lib/mic/utils/rpmmisc.py | 600 ++++++++++++ scripts/lib/mic/utils/runner.py | 109 +++ 13 files changed, 6413 insertions(+) create mode 100644 scripts/lib/mic/utils/BmapCreate.py create mode 100644 scripts/lib/mic/utils/Fiemap.py create mode 100644 scripts/lib/mic/utils/__init__.py create mode 100644 scripts/lib/mic/utils/cmdln.py create mode 100644 scripts/lib/mic/utils/errors.py create mode 100644 scripts/lib/mic/utils/fs_related.py create mode 100644 scripts/lib/mic/utils/gpt_parser.py create mode 100644 scripts/lib/mic/utils/grabber.py create mode 100644 scripts/lib/mic/utils/misc.py create mode 100644 scripts/lib/mic/utils/partitionedfs.py create mode 100644 scripts/lib/mic/utils/proxy.py create mode 100644 scripts/lib/mic/utils/rpmmisc.py create mode 100644 scripts/lib/mic/utils/runner.py (limited to 'scripts/lib/mic/utils') diff --git a/scripts/lib/mic/utils/BmapCreate.py b/scripts/lib/mic/utils/BmapCreate.py new file mode 100644 index 0000000000..65b19a5f46 --- /dev/null +++ b/scripts/lib/mic/utils/BmapCreate.py @@ -0,0 +1,298 @@ +""" This module implements the block map (bmap) creation functionality and +provides the corresponding API in form of the 'BmapCreate' class. + +The idea is that while images files may generally be very large (e.g., 4GiB), +they may nevertheless contain only little real data, e.g., 512MiB. This data +are files, directories, file-system meta-data, partition table, etc. When +copying the image to the target device, you do not have to copy all the 4GiB of +data, you can copy only 512MiB of it, which is 4 times less, so copying should +presumably be 4 times faster. + +The block map file is an XML file which contains a list of blocks which have to +be copied to the target device. The other blocks are not used and there is no +need to copy them. The XML file also contains some additional information like +block size, image size, count of mapped blocks, etc. There are also many +commentaries, so it is human-readable. + +The image has to be a sparse file. Generally, this means that when you generate +this image file, you should start with a huge sparse file which contains a +single hole spanning the entire file. Then you should partition it, write all +the data (probably by means of loop-back mounting the image or parts of it), +etc. The end result should be a sparse file where mapped areas represent useful +parts of the image and holes represent useless parts of the image, which do not +have to be copied when copying the image to the target device. + +This module uses the FIBMAP ioctl to detect holes. """ + +# Disable the following pylint recommendations: +# * Too many instance attributes - R0902 +# * Too few public methods - R0903 +# pylint: disable=R0902,R0903 + +import hashlib +from mic.utils.misc import human_size +from mic.utils import Fiemap + +# The bmap format version we generate +SUPPORTED_BMAP_VERSION = "1.3" + +_BMAP_START_TEMPLATE = \ +""" + + + + + %u + + + %u + + + %u + +""" + +class Error(Exception): + """ A class for exceptions generated by this module. We currently support + only one type of exceptions, and we basically throw human-readable problem + description in case of errors. """ + pass + +class BmapCreate: + """ This class implements the bmap creation functionality. To generate a + bmap for an image (which is supposedly a sparse file), you should first + create an instance of 'BmapCreate' and provide: + + * full path or a file-like object of the image to create bmap for + * full path or a file object to use for writing the results to + + Then you should invoke the 'generate()' method of this class. It will use + the FIEMAP ioctl to generate the bmap. """ + + def _open_image_file(self): + """ Open the image file. """ + + try: + self._f_image = open(self._image_path, 'rb') + except IOError as err: + raise Error("cannot open image file '%s': %s" \ + % (self._image_path, err)) + + self._f_image_needs_close = True + + def _open_bmap_file(self): + """ Open the bmap file. """ + + try: + self._f_bmap = open(self._bmap_path, 'w+') + except IOError as err: + raise Error("cannot open bmap file '%s': %s" \ + % (self._bmap_path, err)) + + self._f_bmap_needs_close = True + + def __init__(self, image, bmap): + """ Initialize a class instance: + * image - full path or a file-like object of the image to create bmap + for + * bmap - full path or a file object to use for writing the resulting + bmap to """ + + self.image_size = None + self.image_size_human = None + self.block_size = None + self.blocks_cnt = None + self.mapped_cnt = None + self.mapped_size = None + self.mapped_size_human = None + self.mapped_percent = None + + self._mapped_count_pos1 = None + self._mapped_count_pos2 = None + self._sha1_pos = None + + self._f_image_needs_close = False + self._f_bmap_needs_close = False + + if hasattr(image, "read"): + self._f_image = image + self._image_path = image.name + else: + self._image_path = image + self._open_image_file() + + if hasattr(bmap, "read"): + self._f_bmap = bmap + self._bmap_path = bmap.name + else: + self._bmap_path = bmap + self._open_bmap_file() + + self.fiemap = Fiemap.Fiemap(self._f_image) + + self.image_size = self.fiemap.image_size + self.image_size_human = human_size(self.image_size) + if self.image_size == 0: + raise Error("cannot generate bmap for zero-sized image file '%s'" \ + % self._image_path) + + self.block_size = self.fiemap.block_size + self.blocks_cnt = self.fiemap.blocks_cnt + + def _bmap_file_start(self): + """ A helper function which generates the starting contents of the + block map file: the header comment, image size, block size, etc. """ + + # We do not know the amount of mapped blocks at the moment, so just put + # whitespaces instead of real numbers. Assume the longest possible + # numbers. + mapped_count = ' ' * len(str(self.image_size)) + mapped_size_human = ' ' * len(self.image_size_human) + + xml = _BMAP_START_TEMPLATE \ + % (SUPPORTED_BMAP_VERSION, self.image_size_human, + self.image_size, self.block_size, self.blocks_cnt) + xml += " \n" % (mapped_size_human, 100.0) + xml += " " + + self._f_bmap.write(xml) + self._mapped_count_pos2 = self._f_bmap.tell() + + xml = "%s \n\n" % mapped_count + + # pylint: disable=C0301 + xml += " \n" + xml += " " + + self._f_bmap.write(xml) + self._sha1_pos = self._f_bmap.tell() + + xml = "0" * 40 + " \n\n" + xml += " \n" + xml += " \n" + # pylint: enable=C0301 + + self._f_bmap.write(xml) + + def _bmap_file_end(self): + """ A helper function which generates the final parts of the block map + file: the ending tags and the information about the amount of mapped + blocks. """ + + xml = " \n" + xml += "\n" + + self._f_bmap.write(xml) + + self._f_bmap.seek(self._mapped_count_pos1) + self._f_bmap.write("%s or %.1f%%" % \ + (self.mapped_size_human, self.mapped_percent)) + + self._f_bmap.seek(self._mapped_count_pos2) + self._f_bmap.write("%u" % self.mapped_cnt) + + self._f_bmap.seek(0) + sha1 = hashlib.sha1(self._f_bmap.read()).hexdigest() + self._f_bmap.seek(self._sha1_pos) + self._f_bmap.write("%s" % sha1) + + def _calculate_sha1(self, first, last): + """ A helper function which calculates SHA1 checksum for the range of + blocks of the image file: from block 'first' to block 'last'. """ + + start = first * self.block_size + end = (last + 1) * self.block_size + + self._f_image.seek(start) + hash_obj = hashlib.new("sha1") + + chunk_size = 1024*1024 + to_read = end - start + read = 0 + + while read < to_read: + if read + chunk_size > to_read: + chunk_size = to_read - read + chunk = self._f_image.read(chunk_size) + hash_obj.update(chunk) + read += chunk_size + + return hash_obj.hexdigest() + + def generate(self, include_checksums = True): + """ Generate bmap for the image file. If 'include_checksums' is 'True', + also generate SHA1 checksums for block ranges. """ + + # Save image file position in order to restore it at the end + image_pos = self._f_image.tell() + + self._bmap_file_start() + + # Generate the block map and write it to the XML block map + # file as we go. + self.mapped_cnt = 0 + for first, last in self.fiemap.get_mapped_ranges(0, self.blocks_cnt): + self.mapped_cnt += last - first + 1 + if include_checksums: + sha1 = self._calculate_sha1(first, last) + sha1 = " sha1=\"%s\"" % sha1 + else: + sha1 = "" + + if first != last: + self._f_bmap.write(" %s-%s \n" \ + % (sha1, first, last)) + else: + self._f_bmap.write(" %s \n" \ + % (sha1, first)) + + self.mapped_size = self.mapped_cnt * self.block_size + self.mapped_size_human = human_size(self.mapped_size) + self.mapped_percent = (self.mapped_cnt * 100.0) / self.blocks_cnt + + self._bmap_file_end() + + try: + self._f_bmap.flush() + except IOError as err: + raise Error("cannot flush the bmap file '%s': %s" \ + % (self._bmap_path, err)) + + self._f_image.seek(image_pos) + + def __del__(self): + """ The class destructor which closes the opened files. """ + + if self._f_image_needs_close: + self._f_image.close() + if self._f_bmap_needs_close: + self._f_bmap.close() diff --git a/scripts/lib/mic/utils/Fiemap.py b/scripts/lib/mic/utils/Fiemap.py new file mode 100644 index 0000000000..f2db6ff0b8 --- /dev/null +++ b/scripts/lib/mic/utils/Fiemap.py @@ -0,0 +1,252 @@ +""" This module implements python API for the FIEMAP ioctl. The FIEMAP ioctl +allows to find holes and mapped areas in a file. """ + +# Note, a lot of code in this module is not very readable, because it deals +# with the rather complex FIEMAP ioctl. To understand the code, you need to +# know the FIEMAP interface, which is documented in the +# Documentation/filesystems/fiemap.txt file in the Linux kernel sources. + +# Disable the following pylint recommendations: +# * Too many instance attributes (R0902) +# pylint: disable=R0902 + +import os +import struct +import array +import fcntl +from mic.utils.misc import get_block_size + +# Format string for 'struct fiemap' +_FIEMAP_FORMAT = "=QQLLLL" +# sizeof(struct fiemap) +_FIEMAP_SIZE = struct.calcsize(_FIEMAP_FORMAT) +# Format string for 'struct fiemap_extent' +_FIEMAP_EXTENT_FORMAT = "=QQQQQLLLL" +# sizeof(struct fiemap_extent) +_FIEMAP_EXTENT_SIZE = struct.calcsize(_FIEMAP_EXTENT_FORMAT) +# The FIEMAP ioctl number +_FIEMAP_IOCTL = 0xC020660B + +# Minimum buffer which is required for 'class Fiemap' to operate +MIN_BUFFER_SIZE = _FIEMAP_SIZE + _FIEMAP_EXTENT_SIZE +# The default buffer size for 'class Fiemap' +DEFAULT_BUFFER_SIZE = 256 * 1024 + +class Error(Exception): + """ A class for exceptions generated by this module. We currently support + only one type of exceptions, and we basically throw human-readable problem + description in case of errors. """ + pass + +class Fiemap: + """ This class provides API to the FIEMAP ioctl. Namely, it allows to + iterate over all mapped blocks and over all holes. """ + + def _open_image_file(self): + """ Open the image file. """ + + try: + self._f_image = open(self._image_path, 'rb') + except IOError as err: + raise Error("cannot open image file '%s': %s" \ + % (self._image_path, err)) + + self._f_image_needs_close = True + + def __init__(self, image, buf_size = DEFAULT_BUFFER_SIZE): + """ Initialize a class instance. The 'image' argument is full path to + the file to operate on, or a file object to operate on. + + The 'buf_size' argument is the size of the buffer for 'struct + fiemap_extent' elements which will be used when invoking the FIEMAP + ioctl. The larger is the buffer, the less times the FIEMAP ioctl will + be invoked. """ + + self._f_image_needs_close = False + + if hasattr(image, "fileno"): + self._f_image = image + self._image_path = image.name + else: + self._image_path = image + self._open_image_file() + + # Validate 'buf_size' + if buf_size < MIN_BUFFER_SIZE: + raise Error("too small buffer (%d bytes), minimum is %d bytes" \ + % (buf_size, MIN_BUFFER_SIZE)) + + # How many 'struct fiemap_extent' elements fit the buffer + buf_size -= _FIEMAP_SIZE + self._fiemap_extent_cnt = buf_size / _FIEMAP_EXTENT_SIZE + self._buf_size = self._fiemap_extent_cnt * _FIEMAP_EXTENT_SIZE + self._buf_size += _FIEMAP_SIZE + + # Allocate a mutable buffer for the FIEMAP ioctl + self._buf = array.array('B', [0] * self._buf_size) + + self.image_size = os.fstat(self._f_image.fileno()).st_size + + try: + self.block_size = get_block_size(self._f_image) + except IOError as err: + raise Error("cannot get block size for '%s': %s" \ + % (self._image_path, err)) + + self.blocks_cnt = self.image_size + self.block_size - 1 + self.blocks_cnt /= self.block_size + + # Synchronize the image file to make sure FIEMAP returns correct values + try: + self._f_image.flush() + except IOError as err: + raise Error("cannot flush image file '%s': %s" \ + % (self._image_path, err)) + try: + os.fsync(self._f_image.fileno()), + except OSError as err: + raise Error("cannot synchronize image file '%s': %s " \ + % (self._image_path, err.strerror)) + + # Check if the FIEMAP ioctl is supported + self.block_is_mapped(0) + + def __del__(self): + """ The class destructor which closes the opened files. """ + + if self._f_image_needs_close: + self._f_image.close() + + def _invoke_fiemap(self, block, count): + """ Invoke the FIEMAP ioctl for 'count' blocks of the file starting from + block number 'block'. + + The full result of the operation is stored in 'self._buf' on exit. + Returns the unpacked 'struct fiemap' data structure in form of a python + list (just like 'struct.upack()'). """ + + if block < 0 or block >= self.blocks_cnt: + raise Error("bad block number %d, should be within [0, %d]" \ + % (block, self.blocks_cnt)) + + # Initialize the 'struct fiemap' part of the buffer + struct.pack_into(_FIEMAP_FORMAT, self._buf, 0, block * self.block_size, + count * self.block_size, 0, 0, + self._fiemap_extent_cnt, 0) + + try: + fcntl.ioctl(self._f_image, _FIEMAP_IOCTL, self._buf, 1) + except IOError as err: + error_msg = "the FIEMAP ioctl failed for '%s': %s" \ + % (self._image_path, err) + if err.errno == os.errno.EPERM or err.errno == os.errno.EACCES: + # The FIEMAP ioctl was added in kernel version 2.6.28 in 2008 + error_msg += " (looks like your kernel does not support FIEMAP)" + + raise Error(error_msg) + + return struct.unpack(_FIEMAP_FORMAT, self._buf[:_FIEMAP_SIZE]) + + def block_is_mapped(self, block): + """ This function returns 'True' if block number 'block' of the image + file is mapped and 'False' otherwise. """ + + struct_fiemap = self._invoke_fiemap(block, 1) + + # The 3rd element of 'struct_fiemap' is the 'fm_mapped_extents' field. + # If it contains zero, the block is not mapped, otherwise it is + # mapped. + return bool(struct_fiemap[3]) + + def block_is_unmapped(self, block): + """ This function returns 'True' if block number 'block' of the image + file is not mapped (hole) and 'False' otherwise. """ + + return not self.block_is_mapped(block) + + def _unpack_fiemap_extent(self, index): + """ Unpack a 'struct fiemap_extent' structure object number 'index' + from the internal 'self._buf' buffer. """ + + offset = _FIEMAP_SIZE + _FIEMAP_EXTENT_SIZE * index + return struct.unpack(_FIEMAP_EXTENT_FORMAT, + self._buf[offset : offset + _FIEMAP_EXTENT_SIZE]) + + def _do_get_mapped_ranges(self, start, count): + """ Implements most the functionality for the 'get_mapped_ranges()' + generator: invokes the FIEMAP ioctl, walks through the mapped + extents and yields mapped block ranges. However, the ranges may be + consecutive (e.g., (1, 100), (100, 200)) and 'get_mapped_ranges()' + simply merges them. """ + + block = start + while block < start + count: + struct_fiemap = self._invoke_fiemap(block, count) + + mapped_extents = struct_fiemap[3] + if mapped_extents == 0: + # No more mapped blocks + return + + extent = 0 + while extent < mapped_extents: + fiemap_extent = self._unpack_fiemap_extent(extent) + + # Start of the extent + extent_start = fiemap_extent[0] + # Starting block number of the extent + extent_block = extent_start / self.block_size + # Length of the extent + extent_len = fiemap_extent[2] + # Count of blocks in the extent + extent_count = extent_len / self.block_size + + # Extent length and offset have to be block-aligned + assert extent_start % self.block_size == 0 + assert extent_len % self.block_size == 0 + + if extent_block > start + count - 1: + return + + first = max(extent_block, block) + last = min(extent_block + extent_count, start + count) - 1 + yield (first, last) + + extent += 1 + + block = extent_block + extent_count + + def get_mapped_ranges(self, start, count): + """ A generator which yields ranges of mapped blocks in the file. The + ranges are tuples of 2 elements: [first, last], where 'first' is the + first mapped block and 'last' is the last mapped block. + + The ranges are yielded for the area of the file of size 'count' blocks, + starting from block 'start'. """ + + iterator = self._do_get_mapped_ranges(start, count) + + first_prev, last_prev = iterator.next() + + for first, last in iterator: + if last_prev == first - 1: + last_prev = last + else: + yield (first_prev, last_prev) + first_prev, last_prev = first, last + + yield (first_prev, last_prev) + + def get_unmapped_ranges(self, start, count): + """ Just like 'get_mapped_ranges()', but yields unmapped block ranges + instead (holes). """ + + hole_first = start + for first, last in self._do_get_mapped_ranges(start, count): + if first > hole_first: + yield (hole_first, first - 1) + + hole_first = last + 1 + + if hole_first < start + count: + yield (hole_first, start + count - 1) diff --git a/scripts/lib/mic/utils/__init__.py b/scripts/lib/mic/utils/__init__.py new file mode 100644 index 0000000000..e69de29bb2 diff --git a/scripts/lib/mic/utils/cmdln.py b/scripts/lib/mic/utils/cmdln.py new file mode 100644 index 0000000000..b099473ee4 --- /dev/null +++ b/scripts/lib/mic/utils/cmdln.py @@ -0,0 +1,1586 @@ +#!/usr/bin/env python +# Copyright (c) 2002-2007 ActiveState Software Inc. +# License: MIT (see LICENSE.txt for license details) +# Author: Trent Mick +# Home: http://trentm.com/projects/cmdln/ + +"""An improvement on Python's standard cmd.py module. + +As with cmd.py, this module provides "a simple framework for writing +line-oriented command intepreters." This module provides a 'RawCmdln' +class that fixes some design flaws in cmd.Cmd, making it more scalable +and nicer to use for good 'cvs'- or 'svn'-style command line interfaces +or simple shells. And it provides a 'Cmdln' class that add +optparse-based option processing. Basically you use it like this: + + import cmdln + + class MySVN(cmdln.Cmdln): + name = "svn" + + @cmdln.alias('stat', 'st') + @cmdln.option('-v', '--verbose', action='store_true' + help='print verbose information') + def do_status(self, subcmd, opts, *paths): + print "handle 'svn status' command" + + #... + + if __name__ == "__main__": + shell = MySVN() + retval = shell.main() + sys.exit(retval) + +See the README.txt or for more +details. +""" + +__version_info__ = (1, 1, 2) +__version__ = '.'.join(map(str, __version_info__)) + +import os +import sys +import re +import cmd +import optparse +from pprint import pprint +import sys + + + + +#---- globals + +LOOP_ALWAYS, LOOP_NEVER, LOOP_IF_EMPTY = range(3) + +# An unspecified optional argument when None is a meaningful value. +_NOT_SPECIFIED = ("Not", "Specified") + +# Pattern to match a TypeError message from a call that +# failed because of incorrect number of arguments (see +# Python/getargs.c). +_INCORRECT_NUM_ARGS_RE = re.compile( + r"(takes [\w ]+ )(\d+)( arguments? \()(\d+)( given\))") + + + +#---- exceptions + +class CmdlnError(Exception): + """A cmdln.py usage error.""" + def __init__(self, msg): + self.msg = msg + def __str__(self): + return self.msg + +class CmdlnUserError(Exception): + """An error by a user of a cmdln-based tool/shell.""" + pass + + + +#---- public methods and classes + +def alias(*aliases): + """Decorator to add aliases for Cmdln.do_* command handlers. + + Example: + class MyShell(cmdln.Cmdln): + @cmdln.alias("!", "sh") + def do_shell(self, argv): + #...implement 'shell' command + """ + def decorate(f): + if not hasattr(f, "aliases"): + f.aliases = [] + f.aliases += aliases + return f + return decorate + + +class RawCmdln(cmd.Cmd): + """An improved (on cmd.Cmd) framework for building multi-subcommand + scripts (think "svn" & "cvs") and simple shells (think "pdb" and + "gdb"). + + A simple example: + + import cmdln + + class MySVN(cmdln.RawCmdln): + name = "svn" + + @cmdln.aliases('stat', 'st') + def do_status(self, argv): + print "handle 'svn status' command" + + if __name__ == "__main__": + shell = MySVN() + retval = shell.main() + sys.exit(retval) + + See for more information. + """ + name = None # if unset, defaults basename(sys.argv[0]) + prompt = None # if unset, defaults to self.name+"> " + version = None # if set, default top-level options include --version + + # Default messages for some 'help' command error cases. + # They are interpolated with one arg: the command. + nohelp = "no help on '%s'" + unknowncmd = "unknown command: '%s'" + + helpindent = '' # string with which to indent help output + + def __init__(self, completekey='tab', + stdin=None, stdout=None, stderr=None): + """Cmdln(completekey='tab', stdin=None, stdout=None, stderr=None) + + The optional argument 'completekey' is the readline name of a + completion key; it defaults to the Tab key. If completekey is + not None and the readline module is available, command completion + is done automatically. + + The optional arguments 'stdin', 'stdout' and 'stderr' specify + alternate input, output and error output file objects; if not + specified, sys.* are used. + + If 'stdout' but not 'stderr' is specified, stdout is used for + error output. This is to provide least surprise for users used + to only the 'stdin' and 'stdout' options with cmd.Cmd. + """ + import sys + if self.name is None: + self.name = os.path.basename(sys.argv[0]) + if self.prompt is None: + self.prompt = self.name+"> " + self._name_str = self._str(self.name) + self._prompt_str = self._str(self.prompt) + if stdin is not None: + self.stdin = stdin + else: + self.stdin = sys.stdin + if stdout is not None: + self.stdout = stdout + else: + self.stdout = sys.stdout + if stderr is not None: + self.stderr = stderr + elif stdout is not None: + self.stderr = stdout + else: + self.stderr = sys.stderr + self.cmdqueue = [] + self.completekey = completekey + self.cmdlooping = False + + def get_optparser(self): + """Hook for subclasses to set the option parser for the + top-level command/shell. + + This option parser is used retrieved and used by `.main()' to + handle top-level options. + + The default implements a single '-h|--help' option. Sub-classes + can return None to have no options at the top-level. Typically + an instance of CmdlnOptionParser should be returned. + """ + version = (self.version is not None + and "%s %s" % (self._name_str, self.version) + or None) + return CmdlnOptionParser(self, version=version) + + def postoptparse(self): + """Hook method executed just after `.main()' parses top-level + options. + + When called `self.options' holds the results of the option parse. + """ + pass + + def main(self, argv=None, loop=LOOP_NEVER): + """A possible mainline handler for a script, like so: + + import cmdln + class MyCmd(cmdln.Cmdln): + name = "mycmd" + ... + + if __name__ == "__main__": + MyCmd().main() + + By default this will use sys.argv to issue a single command to + 'MyCmd', then exit. The 'loop' argument can be use to control + interactive shell behaviour. + + Arguments: + "argv" (optional, default sys.argv) is the command to run. + It must be a sequence, where the first element is the + command name and subsequent elements the args for that + command. + "loop" (optional, default LOOP_NEVER) is a constant + indicating if a command loop should be started (i.e. an + interactive shell). Valid values (constants on this module): + LOOP_ALWAYS start loop and run "argv", if any + LOOP_NEVER run "argv" (or .emptyline()) and exit + LOOP_IF_EMPTY run "argv", if given, and exit; + otherwise, start loop + """ + if argv is None: + import sys + argv = sys.argv + else: + argv = argv[:] # don't modify caller's list + + self.optparser = self.get_optparser() + if self.optparser: # i.e. optparser=None means don't process for opts + try: + self.options, args = self.optparser.parse_args(argv[1:]) + except CmdlnUserError, ex: + msg = "%s: %s\nTry '%s help' for info.\n"\ + % (self.name, ex, self.name) + self.stderr.write(self._str(msg)) + self.stderr.flush() + return 1 + except StopOptionProcessing, ex: + return 0 + else: + self.options, args = None, argv[1:] + self.postoptparse() + + if loop == LOOP_ALWAYS: + if args: + self.cmdqueue.append(args) + return self.cmdloop() + elif loop == LOOP_NEVER: + if args: + return self.cmd(args) + else: + return self.emptyline() + elif loop == LOOP_IF_EMPTY: + if args: + return self.cmd(args) + else: + return self.cmdloop() + + def cmd(self, argv): + """Run one command and exit. + + "argv" is the arglist for the command to run. argv[0] is the + command to run. If argv is an empty list then the + 'emptyline' handler is run. + + Returns the return value from the command handler. + """ + assert isinstance(argv, (list, tuple)), \ + "'argv' is not a sequence: %r" % argv + retval = None + try: + argv = self.precmd(argv) + retval = self.onecmd(argv) + self.postcmd(argv) + except: + if not self.cmdexc(argv): + raise + retval = 1 + return retval + + def _str(self, s): + """Safely convert the given str/unicode to a string for printing.""" + try: + return str(s) + except UnicodeError: + #XXX What is the proper encoding to use here? 'utf-8' seems + # to work better than "getdefaultencoding" (usually + # 'ascii'), on OS X at least. + #import sys + #return s.encode(sys.getdefaultencoding(), "replace") + return s.encode("utf-8", "replace") + + def cmdloop(self, intro=None): + """Repeatedly issue a prompt, accept input, parse into an argv, and + dispatch (via .precmd(), .onecmd() and .postcmd()), passing them + the argv. In other words, start a shell. + + "intro" (optional) is a introductory message to print when + starting the command loop. This overrides the class + "intro" attribute, if any. + """ + self.cmdlooping = True + self.preloop() + if self.use_rawinput and self.completekey: + try: + import readline + self.old_completer = readline.get_completer() + readline.set_completer(self.complete) + readline.parse_and_bind(self.completekey+": complete") + except ImportError: + pass + try: + if intro is None: + intro = self.intro + if intro: + intro_str = self._str(intro) + self.stdout.write(intro_str+'\n') + self.stop = False + retval = None + while not self.stop: + if self.cmdqueue: + argv = self.cmdqueue.pop(0) + assert isinstance(argv, (list, tuple)), \ + "item on 'cmdqueue' is not a sequence: %r" % argv + else: + if self.use_rawinput: + try: + line = raw_input(self._prompt_str) + except EOFError: + line = 'EOF' + else: + self.stdout.write(self._prompt_str) + self.stdout.flush() + line = self.stdin.readline() + if not len(line): + line = 'EOF' + else: + line = line[:-1] # chop '\n' + argv = line2argv(line) + try: + argv = self.precmd(argv) + retval = self.onecmd(argv) + self.postcmd(argv) + except: + if not self.cmdexc(argv): + raise + retval = 1 + self.lastretval = retval + self.postloop() + finally: + if self.use_rawinput and self.completekey: + try: + import readline + readline.set_completer(self.old_completer) + except ImportError: + pass + self.cmdlooping = False + return retval + + def precmd(self, argv): + """Hook method executed just before the command argv is + interpreted, but after the input prompt is generated and issued. + + "argv" is the cmd to run. + + Returns an argv to run (i.e. this method can modify the command + to run). + """ + return argv + + def postcmd(self, argv): + """Hook method executed just after a command dispatch is finished. + + "argv" is the command that was run. + """ + pass + + def cmdexc(self, argv): + """Called if an exception is raised in any of precmd(), onecmd(), + or postcmd(). If True is returned, the exception is deemed to have + been dealt with. Otherwise, the exception is re-raised. + + The default implementation handles CmdlnUserError's, which + typically correspond to user error in calling commands (as + opposed to programmer error in the design of the script using + cmdln.py). + """ + import sys + type, exc, traceback = sys.exc_info() + if isinstance(exc, CmdlnUserError): + msg = "%s %s: %s\nTry '%s help %s' for info.\n"\ + % (self.name, argv[0], exc, self.name, argv[0]) + self.stderr.write(self._str(msg)) + self.stderr.flush() + return True + + def onecmd(self, argv): + if not argv: + return self.emptyline() + self.lastcmd = argv + cmdname = self._get_canonical_cmd_name(argv[0]) + if cmdname: + handler = self._get_cmd_handler(cmdname) + if handler: + return self._dispatch_cmd(handler, argv) + return self.default(argv) + + def _dispatch_cmd(self, handler, argv): + return handler(argv) + + def default(self, argv): + """Hook called to handle a command for which there is no handler. + + "argv" is the command and arguments to run. + + The default implementation writes and error message to stderr + and returns an error exit status. + + Returns a numeric command exit status. + """ + errmsg = self._str(self.unknowncmd % (argv[0],)) + if self.cmdlooping: + self.stderr.write(errmsg+"\n") + else: + self.stderr.write("%s: %s\nTry '%s help' for info.\n" + % (self._name_str, errmsg, self._name_str)) + self.stderr.flush() + return 1 + + def parseline(self, line): + # This is used by Cmd.complete (readline completer function) to + # massage the current line buffer before completion processing. + # We override to drop special '!' handling. + line = line.strip() + if not line: + return None, None, line + elif line[0] == '?': + line = 'help ' + line[1:] + i, n = 0, len(line) + while i < n and line[i] in self.identchars: i = i+1 + cmd, arg = line[:i], line[i:].strip() + return cmd, arg, line + + def helpdefault(self, cmd, known): + """Hook called to handle help on a command for which there is no + help handler. + + "cmd" is the command name on which help was requested. + "known" is a boolean indicating if this command is known + (i.e. if there is a handler for it). + + Returns a return code. + """ + if known: + msg = self._str(self.nohelp % (cmd,)) + if self.cmdlooping: + self.stderr.write(msg + '\n') + else: + self.stderr.write("%s: %s\n" % (self.name, msg)) + else: + msg = self.unknowncmd % (cmd,) + if self.cmdlooping: + self.stderr.write(msg + '\n') + else: + self.stderr.write("%s: %s\n" + "Try '%s help' for info.\n" + % (self.name, msg, self.name)) + self.stderr.flush() + return 1 + + def do_help(self, argv): + """${cmd_name}: give detailed help on a specific sub-command + + Usage: + ${name} help [COMMAND] + """ + if len(argv) > 1: # asking for help on a particular command + doc = None + cmdname = self._get_canonical_cmd_name(argv[1]) or argv[1] + if not cmdname: + return self.helpdefault(argv[1], False) + else: + helpfunc = getattr(self, "help_"+cmdname, None) + if helpfunc: + doc = helpfunc() + else: + handler = self._get_cmd_handler(cmdname) + if handler: + doc = handler.__doc__ + if doc is None: + return self.helpdefault(argv[1], handler != None) + else: # bare "help" command + doc = self.__class__.__doc__ # try class docstring + if doc is None: + # Try to provide some reasonable useful default help. + if self.cmdlooping: prefix = "" + else: prefix = self.name+' ' + doc = """Usage: + %sCOMMAND [ARGS...] + %shelp [COMMAND] + + ${option_list} + ${command_list} + ${help_list} + """ % (prefix, prefix) + cmdname = None + + if doc: # *do* have help content, massage and print that + doc = self._help_reindent(doc) + doc = self._help_preprocess(doc, cmdname) + doc = doc.rstrip() + '\n' # trim down trailing space + self.stdout.write(self._str(doc)) + self.stdout.flush() + do_help.aliases = ["?"] + + def _help_reindent(self, help, indent=None): + """Hook to re-indent help strings before writing to stdout. + + "help" is the help content to re-indent + "indent" is a string with which to indent each line of the + help content after normalizing. If unspecified or None + then the default is use: the 'self.helpindent' class + attribute. By default this is the empty string, i.e. + no indentation. + + By default, all common leading whitespace is removed and then + the lot is indented by 'self.helpindent'. When calculating the + common leading whitespace the first line is ignored -- hence + help content for Conan can be written as follows and have the + expected indentation: + + def do_crush(self, ...): + '''${cmd_name}: crush your enemies, see them driven before you... + + c.f. Conan the Barbarian''' + """ + if indent is None: + indent = self.helpindent + lines = help.splitlines(0) + _dedentlines(lines, skip_first_line=True) + lines = [(indent+line).rstrip() for line in lines] + return '\n'.join(lines) + + def _help_preprocess(self, help, cmdname): + """Hook to preprocess a help string before writing to stdout. + + "help" is the help string to process. + "cmdname" is the canonical sub-command name for which help + is being given, or None if the help is not specific to a + command. + + By default the following template variables are interpolated in + help content. (Note: these are similar to Python 2.4's + string.Template interpolation but not quite.) + + ${name} + The tool's/shell's name, i.e. 'self.name'. + ${option_list} + A formatted table of options for this shell/tool. + ${command_list} + A formatted table of available sub-commands. + ${help_list} + A formatted table of additional help topics (i.e. 'help_*' + methods with no matching 'do_*' method). + ${cmd_name} + The name (and aliases) for this sub-command formatted as: + "NAME (ALIAS1, ALIAS2, ...)". + ${cmd_usage} + A formatted usage block inferred from the command function + signature. + ${cmd_option_list} + A formatted table of options for this sub-command. (This is + only available for commands using the optparse integration, + i.e. using @cmdln.option decorators or manually setting the + 'optparser' attribute on the 'do_*' method.) + + Returns the processed help. + """ + preprocessors = { + "${name}": self._help_preprocess_name, + "${option_list}": self._help_preprocess_option_list, + "${command_list}": self._help_preprocess_command_list, + "${help_list}": self._help_preprocess_help_list, + "${cmd_name}": self._help_preprocess_cmd_name, + "${cmd_usage}": self._help_preprocess_cmd_usage, + "${cmd_option_list}": self._help_preprocess_cmd_option_list, + } + + for marker, preprocessor in preprocessors.items(): + if marker in help: + help = preprocessor(help, cmdname) + return help + + def _help_preprocess_name(self, help, cmdname=None): + return help.replace("${name}", self.name) + + def _help_preprocess_option_list(self, help, cmdname=None): + marker = "${option_list}" + indent, indent_width = _get_indent(marker, help) + suffix = _get_trailing_whitespace(marker, help) + + if self.optparser: + # Setup formatting options and format. + # - Indentation of 4 is better than optparse default of 2. + # C.f. Damian Conway's discussion of this in Perl Best + # Practices. + self.optparser.formatter.indent_increment = 4 + self.optparser.formatter.current_indent = indent_width + block = self.optparser.format_option_help() + '\n' + else: + block = "" + + help = help.replace(indent+marker+suffix, block, 1) + return help + + + def _help_preprocess_command_list(self, help, cmdname=None): + marker = "${command_list}" + indent, indent_width = _get_indent(marker, help) + suffix = _get_trailing_whitespace(marker, help) + + # Find any aliases for commands. + token2canonical = self._get_canonical_map() + aliases = {} + for token, cmdname in token2canonical.items(): + if token == cmdname: continue + aliases.setdefault(cmdname, []).append(token) + + # Get the list of (non-hidden) commands and their + # documentation, if any. + cmdnames = {} # use a dict to strip duplicates + for attr in self.get_names(): + if attr.startswith("do_"): + cmdnames[attr[3:]] = True + cmdnames = cmdnames.keys() + cmdnames.sort() + linedata = [] + for cmdname in cmdnames: + if aliases.get(cmdname): + a = aliases[cmdname] + a.sort() + cmdstr = "%s (%s)" % (cmdname, ", ".join(a)) + else: + cmdstr = cmdname + doc = None + try: + helpfunc = getattr(self, 'help_'+cmdname) + except AttributeError: + handler = self._get_cmd_handler(cmdname) + if handler: + doc = handler.__doc__ + else: + doc = helpfunc() + + # Strip "${cmd_name}: " from the start of a command's doc. Best + # practice dictates that command help strings begin with this, but + # it isn't at all wanted for the command list. + to_strip = "${cmd_name}:" + if doc and doc.startswith(to_strip): + #log.debug("stripping %r from start of %s's help string", + # to_strip, cmdname) + doc = doc[len(to_strip):].lstrip() + linedata.append( (cmdstr, doc) ) + + if linedata: + subindent = indent + ' '*4 + lines = _format_linedata(linedata, subindent, indent_width+4) + block = indent + "Commands:\n" \ + + '\n'.join(lines) + "\n\n" + help = help.replace(indent+marker+suffix, block, 1) + return help + + def _gen_names_and_attrs(self): + # Inheritance says we have to look in class and + # base classes; order is not important. + names = [] + classes = [self.__class__] + while classes: + aclass = classes.pop(0) + if aclass.__bases__: + classes = classes + list(aclass.__bases__) + for name in dir(aclass): + yield (name, getattr(aclass, name)) + + def _help_preprocess_help_list(self, help, cmdname=None): + marker = "${help_list}" + indent, indent_width = _get_indent(marker, help) + suffix = _get_trailing_whitespace(marker, help) + + # Determine the additional help topics, if any. + helpnames = {} + token2cmdname = self._get_canonical_map() + for attrname, attr in self._gen_names_and_attrs(): + if not attrname.startswith("help_"): continue + helpname = attrname[5:] + if helpname not in token2cmdname: + helpnames[helpname] = attr + + if helpnames: + linedata = [(n, a.__doc__ or "") for n, a in helpnames.items()] + linedata.sort() + + subindent = indent + ' '*4 + lines = _format_linedata(linedata, subindent, indent_width+4) + block = (indent + + "Additional help topics (run `%s help TOPIC'):\n" % self.name + + '\n'.join(lines) + + "\n\n") + else: + block = '' + help = help.replace(indent+marker+suffix, block, 1) + return help + + def _help_preprocess_cmd_name(self, help, cmdname=None): + marker = "${cmd_name}" + handler = self._get_cmd_handler(cmdname) + if not handler: + raise CmdlnError("cannot preprocess '%s' into help string: " + "could not find command handler for %r" + % (marker, cmdname)) + s = cmdname + if hasattr(handler, "aliases"): + s += " (%s)" % (", ".join(handler.aliases)) + help = help.replace(marker, s) + return help + + #TODO: this only makes sense as part of the Cmdln class. + # Add hooks to add help preprocessing template vars and put + # this one on that class. + def _help_preprocess_cmd_usage(self, help, cmdname=None): + marker = "${cmd_usage}" + handler = self._get_cmd_handler(cmdname) + if not handler: + raise CmdlnError("cannot preprocess '%s' into help string: " + "could not find command handler for %r" + % (marker, cmdname)) + indent, indent_width = _get_indent(marker, help) + suffix = _get_trailing_whitespace(marker, help) + + # Extract the introspection bits we need. + func = handler.im_func + if func.func_defaults: + func_defaults = list(func.func_defaults) + else: + func_defaults = [] + co_argcount = func.func_code.co_argcount + co_varnames = func.func_code.co_varnames + co_flags = func.func_code.co_flags + CO_FLAGS_ARGS = 4 + CO_FLAGS_KWARGS = 8 + + # Adjust argcount for possible *args and **kwargs arguments. + argcount = co_argcount + if co_flags & CO_FLAGS_ARGS: argcount += 1 + if co_flags & CO_FLAGS_KWARGS: argcount += 1 + + # Determine the usage string. + usage = "%s %s" % (self.name, cmdname) + if argcount <= 2: # handler ::= do_FOO(self, argv) + usage += " [ARGS...]" + elif argcount >= 3: # handler ::= do_FOO(self, subcmd, opts, ...) + argnames = list(co_varnames[3:argcount]) + tail = "" + if co_flags & CO_FLAGS_KWARGS: + name = argnames.pop(-1) + import warnings + # There is no generally accepted mechanism for passing + # keyword arguments from the command line. Could + # *perhaps* consider: arg=value arg2=value2 ... + warnings.warn("argument '**%s' on '%s.%s' command " + "handler will never get values" + % (name, self.__class__.__name__, + func.func_name)) + if co_flags & CO_FLAGS_ARGS: + name = argnames.pop(-1) + tail = "[%s...]" % name.upper() + while func_defaults: + func_defaults.pop(-1) + name = argnames.pop(-1) + tail = "[%s%s%s]" % (name.upper(), (tail and ' ' or ''), tail) + while argnames: + name = argnames.pop(-1) + tail = "%s %s" % (name.upper(), tail) + usage += ' ' + tail + + block_lines = [ + self.helpindent + "Usage:", + self.helpindent + ' '*4 + usage + ] + block = '\n'.join(block_lines) + '\n\n' + + help = help.replace(indent+marker+suffix, block, 1) + return help + + #TODO: this only makes sense as part of the Cmdln class. + # Add hooks to add help preprocessing template vars and put + # this one on that class. + def _help_preprocess_cmd_option_list(self, help, cmdname=None): + marker = "${cmd_option_list}" + handler = self._get_cmd_handler(cmdname) + if not handler: + raise CmdlnError("cannot preprocess '%s' into help string: " + "could not find command handler for %r" + % (marker, cmdname)) + indent, indent_width = _get_indent(marker, help) + suffix = _get_trailing_whitespace(marker, help) + if hasattr(handler, "optparser"): + # Setup formatting options and format. + # - Indentation of 4 is better than optparse default of 2. + # C.f. Damian Conway's discussion of this in Perl Best + # Practices. + handler.optparser.formatter.indent_increment = 4 + handler.optparser.formatter.current_indent = indent_width + block = handler.optparser.format_option_help() + '\n' + else: + block = "" + + help = help.replace(indent+marker+suffix, block, 1) + return help + + def _get_canonical_cmd_name(self, token): + map = self._get_canonical_map() + return map.get(token, None) + + def _get_canonical_map(self): + """Return a mapping of available command names and aliases to + their canonical command name. + """ + cacheattr = "_token2canonical" + if not hasattr(self, cacheattr): + # Get the list of commands and their aliases, if any. + token2canonical = {} + cmd2funcname = {} # use a dict to strip duplicates + for attr in self.get_names(): + if attr.startswith("do_"): cmdname = attr[3:] + elif attr.startswith("_do_"): cmdname = attr[4:] + else: + continue + cmd2funcname[cmdname] = attr + token2canonical[cmdname] = cmdname + for cmdname, funcname in cmd2funcname.items(): # add aliases + func = getattr(self, funcname) + aliases = getattr(func, "aliases", []) + for alias in aliases: + if alias in cmd2funcname: + import warnings + warnings.warn("'%s' alias for '%s' command conflicts " + "with '%s' handler" + % (alias, cmdname, cmd2funcname[alias])) + continue + token2canonical[alias] = cmdname + setattr(self, cacheattr, token2canonical) + return getattr(self, cacheattr) + + def _get_cmd_handler(self, cmdname): + handler = None + try: + handler = getattr(self, 'do_' + cmdname) + except AttributeError: + try: + # Private command handlers begin with "_do_". + handler = getattr(self, '_do_' + cmdname) + except AttributeError: + pass + return handler + + def _do_EOF(self, argv): + # Default EOF handler + # Note: an actual EOF is redirected to this command. + #TODO: separate name for this. Currently it is available from + # command-line. Is that okay? + self.stdout.write('\n') + self.stdout.flush() + self.stop = True + + def emptyline(self): + # Different from cmd.Cmd: don't repeat the last command for an + # emptyline. + if self.cmdlooping: + pass + else: + return self.do_help(["help"]) + + +#---- optparse.py extension to fix (IMO) some deficiencies +# +# See the class _OptionParserEx docstring for details. +# + +class StopOptionProcessing(Exception): + """Indicate that option *and argument* processing should stop + cleanly. This is not an error condition. It is similar in spirit to + StopIteration. This is raised by _OptionParserEx's default "help" + and "version" option actions and can be raised by custom option + callbacks too. + + Hence the typical CmdlnOptionParser (a subclass of _OptionParserEx) + usage is: + + parser = CmdlnOptionParser(mycmd) + parser.add_option("-f", "--force", dest="force") + ... + try: + opts, args = parser.parse_args() + except StopOptionProcessing: + # normal termination, "--help" was probably given + sys.exit(0) + """ + +class _OptionParserEx(optparse.OptionParser): + """An optparse.OptionParser that uses exceptions instead of sys.exit. + + This class is an extension of optparse.OptionParser that differs + as follows: + - Correct (IMO) the default OptionParser error handling to never + sys.exit(). Instead OptParseError exceptions are passed through. + - Add the StopOptionProcessing exception (a la StopIteration) to + indicate normal termination of option processing. + See StopOptionProcessing's docstring for details. + + I'd also like to see the following in the core optparse.py, perhaps + as a RawOptionParser which would serve as a base class for the more + generally used OptionParser (that works as current): + - Remove the implicit addition of the -h|--help and --version + options. They can get in the way (e.g. if want '-?' and '-V' for + these as well) and it is not hard to do: + optparser.add_option("-h", "--help", action="help") + optparser.add_option("--version", action="version") + These are good practices, just not valid defaults if they can + get in the way. + """ + def error(self, msg): + raise optparse.OptParseError(msg) + + def exit(self, status=0, msg=None): + if status == 0: + raise StopOptionProcessing(msg) + else: + #TODO: don't lose status info here + raise optparse.OptParseError(msg) + + + +#---- optparse.py-based option processing support + +class CmdlnOptionParser(_OptionParserEx): + """An optparse.OptionParser class more appropriate for top-level + Cmdln options. For parsing of sub-command options, see + SubCmdOptionParser. + + Changes: + - disable_interspersed_args() by default, because a Cmdln instance + has sub-commands which may themselves have options. + - Redirect print_help() to the Cmdln.do_help() which is better + equiped to handle the "help" action. + - error() will raise a CmdlnUserError: OptionParse.error() is meant + to be called for user errors. Raising a well-known error here can + make error handling clearer. + - Also see the changes in _OptionParserEx. + """ + def __init__(self, cmdln, **kwargs): + self.cmdln = cmdln + kwargs["prog"] = self.cmdln.name + _OptionParserEx.__init__(self, **kwargs) + self.disable_interspersed_args() + + def print_help(self, file=None): + self.cmdln.onecmd(["help"]) + + def error(self, msg): + raise CmdlnUserError(msg) + + +class SubCmdOptionParser(_OptionParserEx): + def set_cmdln_info(self, cmdln, subcmd): + """Called by Cmdln to pass relevant info about itself needed + for print_help(). + """ + self.cmdln = cmdln + self.subcmd = subcmd + + def print_help(self, file=None): + self.cmdln.onecmd(["help", self.subcmd]) + + def error(self, msg): + raise CmdlnUserError(msg) + + +def option(*args, **kwargs): + """Decorator to add an option to the optparser argument of a Cmdln + subcommand. + + Example: + class MyShell(cmdln.Cmdln): + @cmdln.option("-f", "--force", help="force removal") + def do_remove(self, subcmd, opts, *args): + #... + """ + #XXX Is there a possible optimization for many options to not have a + # large stack depth here? + def decorate(f): + if not hasattr(f, "optparser"): + f.optparser = SubCmdOptionParser() + f.optparser.add_option(*args, **kwargs) + return f + return decorate + + +class Cmdln(RawCmdln): + """An improved (on cmd.Cmd) framework for building multi-subcommand + scripts (think "svn" & "cvs") and simple shells (think "pdb" and + "gdb"). + + A simple example: + + import cmdln + + class MySVN(cmdln.Cmdln): + name = "svn" + + @cmdln.aliases('stat', 'st') + @cmdln.option('-v', '--verbose', action='store_true' + help='print verbose information') + def do_status(self, subcmd, opts, *paths): + print "handle 'svn status' command" + + #... + + if __name__ == "__main__": + shell = MySVN() + retval = shell.main() + sys.exit(retval) + + 'Cmdln' extends 'RawCmdln' by providing optparse option processing + integration. See this class' _dispatch_cmd() docstring and + for more information. + """ + def _dispatch_cmd(self, handler, argv): + """Introspect sub-command handler signature to determine how to + dispa