| #!/usr/bin/env python3 |
| # |
| # Copyright (c) 2016 Intel, Inc. |
| # |
| # SPDX-License-Identifier: GPL-2.0-only |
| # |
| # DESCRIPTION |
| # This module provides parser for kickstart format |
| # |
| # AUTHORS |
| # Ed Bartosh <ed.bartosh> (at] linux.intel.com> |
| |
| """Kickstart parser module.""" |
| |
| import os |
| import shlex |
| import logging |
| import re |
| |
| from argparse import ArgumentParser, ArgumentError, ArgumentTypeError |
| |
| from wic.engine import find_canned |
| from wic.partition import Partition |
| from wic.misc import get_bitbake_var |
| |
| logger = logging.getLogger('wic') |
| |
| __expand_var_regexp__ = re.compile(r"\${[^{}@\n\t :]+}") |
| |
| def expand_line(line): |
| while True: |
| m = __expand_var_regexp__.search(line) |
| if not m: |
| return line |
| key = m.group()[2:-1] |
| val = get_bitbake_var(key) |
| if val is None: |
| logger.warning("cannot expand variable %s" % key) |
| return line |
| line = line[:m.start()] + val + line[m.end():] |
| |
| class KickStartError(Exception): |
| """Custom exception.""" |
| pass |
| |
| class KickStartParser(ArgumentParser): |
| """ |
| This class overwrites error method to throw exception |
| instead of producing usage message(default argparse behavior). |
| """ |
| def error(self, message): |
| raise ArgumentError(None, message) |
| |
| def sizetype(default): |
| def f(arg): |
| """ |
| Custom type for ArgumentParser |
| Converts size string in <num>[K|k|M|G] format into the integer value |
| """ |
| try: |
| suffix = default |
| size = int(arg) |
| except ValueError: |
| try: |
| suffix = arg[-1:] |
| size = int(arg[:-1]) |
| except ValueError: |
| raise ArgumentTypeError("Invalid size: %r" % arg) |
| |
| if suffix == "k" or suffix == "K": |
| return size |
| if suffix == "M": |
| return size * 1024 |
| if suffix == "G": |
| return size * 1024 * 1024 |
| |
| raise ArgumentTypeError("Invalid size: %r" % arg) |
| return f |
| |
| def overheadtype(arg): |
| """ |
| Custom type for ArgumentParser |
| Converts overhead string to float and checks if it's bigger than 1.0 |
| """ |
| try: |
| result = float(arg) |
| except ValueError: |
| raise ArgumentTypeError("Invalid value: %r" % arg) |
| |
| if result < 1.0: |
| raise ArgumentTypeError("Overhead factor should be > 1.0" % arg) |
| |
| return result |
| |
| def cannedpathtype(arg): |
| """ |
| Custom type for ArgumentParser |
| Tries to find file in the list of canned wks paths |
| """ |
| scripts_path = os.path.abspath(os.path.dirname(__file__) + '../../..') |
| result = find_canned(scripts_path, arg) |
| if not result: |
| raise ArgumentTypeError("file not found: %s" % arg) |
| return result |
| |
| def systemidtype(arg): |
| """ |
| Custom type for ArgumentParser |
| Checks if the argument sutisfies system id requirements, |
| i.e. if it's one byte long integer > 0 |
| """ |
| error = "Invalid system type: %s. must be hex "\ |
| "between 0x1 and 0xFF" % arg |
| try: |
| result = int(arg, 16) |
| except ValueError: |
| raise ArgumentTypeError(error) |
| |
| if result <= 0 or result > 0xff: |
| raise ArgumentTypeError(error) |
| |
| return arg |
| |
| class KickStart(): |
| """Kickstart parser implementation.""" |
| |
| DEFAULT_EXTRA_SPACE = 10*1024 |
| DEFAULT_OVERHEAD_FACTOR = 1.3 |
| |
| def __init__(self, confpath): |
| |
| self.partitions = [] |
| self.bootloader = None |
| self.lineno = 0 |
| self.partnum = 0 |
| |
| parser = KickStartParser() |
| subparsers = parser.add_subparsers() |
| |
| part = subparsers.add_parser('part') |
| part.add_argument('mountpoint', nargs='?') |
| part.add_argument('--active', action='store_true') |
| part.add_argument('--align', type=int) |
| part.add_argument('--offset', type=sizetype("K")) |
| part.add_argument('--exclude-path', nargs='+') |
| part.add_argument('--include-path', nargs='+', action='append') |
| part.add_argument('--change-directory') |
| part.add_argument("--extra-space", type=sizetype("M")) |
| part.add_argument('--fsoptions', dest='fsopts') |
| part.add_argument('--fstype', default='vfat', |
| choices=('ext2', 'ext3', 'ext4', 'btrfs', |
| 'squashfs', 'vfat', 'msdos', 'swap')) |
| part.add_argument('--mkfs-extraopts', default='') |
| part.add_argument('--label') |
| part.add_argument('--use-label', action='store_true') |
| part.add_argument('--no-table', action='store_true') |
| part.add_argument('--ondisk', '--ondrive', dest='disk', default='sda') |
| part.add_argument("--overhead-factor", type=overheadtype) |
| part.add_argument('--part-name') |
| part.add_argument('--part-type') |
| part.add_argument('--rootfs-dir') |
| part.add_argument('--type', default='primary', |
| choices = ('primary', 'logical')) |
| |
| # --size and --fixed-size cannot be specified together; options |
| # ----extra-space and --overhead-factor should also raise a parser |
| # --error, but since nesting mutually exclusive groups does not work, |
| # ----extra-space/--overhead-factor are handled later |
| sizeexcl = part.add_mutually_exclusive_group() |
| sizeexcl.add_argument('--size', type=sizetype("M"), default=0) |
| sizeexcl.add_argument('--fixed-size', type=sizetype("M"), default=0) |
| |
| part.add_argument('--source') |
| part.add_argument('--sourceparams') |
| part.add_argument('--system-id', type=systemidtype) |
| part.add_argument('--use-uuid', action='store_true') |
| part.add_argument('--uuid') |
| part.add_argument('--fsuuid') |
| |
| bootloader = subparsers.add_parser('bootloader') |
| bootloader.add_argument('--append') |
| bootloader.add_argument('--configfile') |
| bootloader.add_argument('--ptable', choices=('msdos', 'gpt'), |
| default='msdos') |
| bootloader.add_argument('--timeout', type=int) |
| bootloader.add_argument('--source') |
| |
| include = subparsers.add_parser('include') |
| include.add_argument('path', type=cannedpathtype) |
| |
| self._parse(parser, confpath) |
| if not self.bootloader: |
| logger.warning('bootloader config not specified, using defaults\n') |
| self.bootloader = bootloader.parse_args([]) |
| |
| def _parse(self, parser, confpath): |
| """ |
| Parse file in .wks format using provided parser. |
| """ |
| with open(confpath) as conf: |
| lineno = 0 |
| for line in conf: |
| line = line.strip() |
| lineno += 1 |
| if line and line[0] != '#': |
| line = expand_line(line) |
| try: |
| line_args = shlex.split(line) |
| parsed = parser.parse_args(line_args) |
| except ArgumentError as err: |
| raise KickStartError('%s:%d: %s' % \ |
| (confpath, lineno, err)) |
| if line.startswith('part'): |
| # SquashFS does not support filesystem UUID |
| if parsed.fstype == 'squashfs': |
| if parsed.fsuuid: |
| err = "%s:%d: SquashFS does not support UUID" \ |
| % (confpath, lineno) |
| raise KickStartError(err) |
| if parsed.label: |
| err = "%s:%d: SquashFS does not support LABEL" \ |
| % (confpath, lineno) |
| raise KickStartError(err) |
| if parsed.use_label and not parsed.label: |
| err = "%s:%d: Must set the label with --label" \ |
| % (confpath, lineno) |
| raise KickStartError(err) |
| # using ArgumentParser one cannot easily tell if option |
| # was passed as argument, if said option has a default |
| # value; --overhead-factor/--extra-space cannot be used |
| # with --fixed-size, so at least detect when these were |
| # passed with non-0 values ... |
| if parsed.fixed_size: |
| if parsed.overhead_factor or parsed.extra_space: |
| err = "%s:%d: arguments --overhead-factor and --extra-space not "\ |
| "allowed with argument --fixed-size" \ |
| % (confpath, lineno) |
| raise KickStartError(err) |
| else: |
| # ... and provide defaults if not using |
| # --fixed-size iff given option was not used |
| # (again, one cannot tell if option was passed but |
| # with value equal to 0) |
| if '--overhead-factor' not in line_args: |
| parsed.overhead_factor = self.DEFAULT_OVERHEAD_FACTOR |
| if '--extra-space' not in line_args: |
| parsed.extra_space = self.DEFAULT_EXTRA_SPACE |
| |
| self.partnum += 1 |
| self.partitions.append(Partition(parsed, self.partnum)) |
| elif line.startswith('include'): |
| self._parse(parser, parsed.path) |
| elif line.startswith('bootloader'): |
| if not self.bootloader: |
| self.bootloader = parsed |
| # Concatenate the strings set in APPEND |
| append_var = get_bitbake_var("APPEND") |
| if append_var: |
| self.bootloader.append = ' '.join(filter(None, \ |
| (self.bootloader.append, append_var))) |
| else: |
| err = "%s:%d: more than one bootloader specified" \ |
| % (confpath, lineno) |
| raise KickStartError(err) |