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#!/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(arg):
"""
Custom type for ArgumentParser
Converts size string in <num>[K|k|M|G] format into the integer value
"""
if arg.isdigit():
return int(arg) * 1024
if not arg[:-1].isdigit():
raise ArgumentTypeError("Invalid size: %r" % arg)
size = int(arg[:-1])
if arg.endswith("k") or arg.endswith("K"):
return size
if arg.endswith("M"):
return size * 1024
if arg.endswith("G"):
return size * 1024 * 1024
raise ArgumentTypeError("Invalid size: %r" % arg)
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('--exclude-path', nargs='+')
part.add_argument("--extra-space", type=sizetype)
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, default=0)
sizeexcl.add_argument('--fixed-size', type=sizetype, 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
else:
err = "%s:%d: more than one bootloader specified" \
% (confpath, lineno)
raise KickStartError(err)
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