summaryrefslogtreecommitdiffstats
path: root/scripts/lib/wic/ksparser.py
blob: f32315c6317d4928a5684216c862ad197a9177eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
#!/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='+')
        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("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)