summaryrefslogtreecommitdiff
path: root/scripts/lib/wic/partition.py
blob: f40d1bc8b643265353be4c674410861aa7f35f0a (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
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
#
# Copyright (c) 2013-2016 Intel Corporation.
# All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# DESCRIPTION
# This module provides the OpenEmbedded partition object definitions.
#
# AUTHORS
# Tom Zanussi <tom.zanussi (at] linux.intel.com>
# Ed Bartosh <ed.bartosh> (at] linux.intel.com>

import os
import tempfile
import uuid

from wic.utils.oe.misc import msger, parse_sourceparams
from wic.utils.oe.misc import exec_cmd, exec_native_cmd
from wic.plugin import pluginmgr

partition_methods = {
    "do_stage_partition":None,
    "do_prepare_partition":None,
    "do_configure_partition":None,
}

class Partition(object):

    def __init__(self, args, lineno):
        self.args = args
        self.active = args.active
        self.align = args.align
        self.disk = args.disk
        self.extra_space = args.extra_space
        self.fsopts = args.fsopts
        self.fstype = args.fstype
        self.label = args.label
        self.mountpoint = args.mountpoint
        self.no_table = args.no_table
        self.overhead_factor = args.overhead_factor
        self.part_type = args.part_type
        self.rootfs_dir = args.rootfs_dir
        self.size = args.size
        self.source = args.source
        self.sourceparams = args.sourceparams
        self.use_uuid = args.use_uuid
        self.uuid = args.uuid
        if args.use_uuid and not self.uuid:
            self.uuid = str(uuid.uuid4())

        self.lineno = lineno
        self.source_file = ""
        self.sourceparams_dict = {}

    def get_extra_block_count(self, current_blocks):
        """
        The --size param is reflected in self.size (in kB), and we already
        have current_blocks (1k) blocks, calculate and return the
        number of (1k) blocks we need to add to get to --size, 0 if
        we're already there or beyond.
        """
        msger.debug("Requested partition size for %s: %d" % \
                    (self.mountpoint, self.size))

        if not self.size:
            return 0

        requested_blocks = self.size

        msger.debug("Requested blocks %d, current_blocks %d" % \
                    (requested_blocks, current_blocks))

        if requested_blocks > current_blocks:
            return requested_blocks - current_blocks
        else:
            return 0

    def prepare(self, creator, cr_workdir, oe_builddir, rootfs_dir,
                bootimg_dir, kernel_dir, native_sysroot):
        """
        Prepare content for individual partitions, depending on
        partition command parameters.
        """
        if self.sourceparams:
            self.sourceparams_dict = parse_sourceparams(self.sourceparams)

        if not self.source:
            if not self.size:
                msger.error("The %s partition has a size of zero.  Please "
                            "specify a non-zero --size for that partition." % \
                            self.mountpoint)
            if self.fstype and self.fstype == "swap":
                self.prepare_swap_partition(cr_workdir, oe_builddir,
                                            native_sysroot)
                self.source_file = "%s/fs.%s" % (cr_workdir, self.fstype)
            elif self.fstype:
                rootfs = "%s/fs_%s.%s.%s" % (cr_workdir, self.label,
                                             self.lineno, self.fstype)
                if os.path.isfile(rootfs):
                    os.remove(rootfs)
                for prefix in ("ext", "btrfs", "vfat", "squashfs"):
                    if self.fstype.startswith(prefix):
                        method = getattr(self,
                                         "prepare_empty_partition_" + prefix)
                        method(rootfs, oe_builddir, native_sysroot)
                        self.source_file = rootfs
                        break
            return

        plugins = pluginmgr.get_source_plugins()

        if self.source not in plugins:
            msger.error("The '%s' --source specified for %s doesn't exist.\n\t"
                        "See 'wic list source-plugins' for a list of available"
                        " --sources.\n\tSee 'wic help source-plugins' for "
                        "details on adding a new source plugin." % \
                        (self.source, self.mountpoint))

        self._source_methods = pluginmgr.get_source_plugin_methods(\
                                   self.source, partition_methods)
        self._source_methods["do_configure_partition"](self, self.sourceparams_dict,
                                                       creator, cr_workdir,
                                                       oe_builddir,
                                                       bootimg_dir,
                                                       kernel_dir,
                                                       native_sysroot)
        self._source_methods["do_stage_partition"](self, self.sourceparams_dict,
                                                   creator, cr_workdir,
                                                   oe_builddir,
                                                   bootimg_dir, kernel_dir,
                                                   native_sysroot)
        self._source_methods["do_prepare_partition"](self, self.sourceparams_dict,
                                                     creator, cr_workdir,
                                                     oe_builddir,
                                                     bootimg_dir, kernel_dir, rootfs_dir,
                                                     native_sysroot)

    def prepare_rootfs_from_fs_image(self, cr_workdir, oe_builddir,
                                     rootfs_dir):
        """
        Handle an already-created partition e.g. xxx.ext3
        """
        rootfs = oe_builddir
        du_cmd = "du -Lbks %s" % rootfs
        out = exec_cmd(du_cmd)
        rootfs_size = out.split()[0]

        self.size = rootfs_size
        self.source_file = rootfs

    def prepare_rootfs(self, cr_workdir, oe_builddir, rootfs_dir,
                       native_sysroot):
        """
        Prepare content for a rootfs partition i.e. create a partition
        and fill it from a /rootfs dir.

        Currently handles ext2/3/4, btrfs and vfat.
        """
        p_prefix = os.environ.get("PSEUDO_PREFIX", "%s/usr" % native_sysroot)
        p_localstatedir = os.environ.get("PSEUDO_LOCALSTATEDIR",
                                         "%s/../pseudo" % rootfs_dir)
        p_passwd = os.environ.get("PSEUDO_PASSWD", rootfs_dir)
        p_nosymlinkexp = os.environ.get("PSEUDO_NOSYMLINKEXP", "1")
        pseudo = "export PSEUDO_PREFIX=%s;" % p_prefix
        pseudo += "export PSEUDO_LOCALSTATEDIR=%s;" % p_localstatedir
        pseudo += "export PSEUDO_PASSWD=%s;" % p_passwd
        pseudo += "export PSEUDO_NOSYMLINKEXP=%s;" % p_nosymlinkexp
        pseudo += "%s/usr/bin/pseudo " % native_sysroot

        rootfs = "%s/rootfs_%s.%s.%s" % (cr_workdir, self.label,
                                         self.lineno, self.fstype)
        if os.path.isfile(rootfs):
            os.remove(rootfs)

        for prefix in ("ext", "btrfs", "vfat", "squashfs"):
            if self.fstype.startswith(prefix):
                method = getattr(self, "prepare_rootfs_" + prefix)
                method(rootfs, oe_builddir, rootfs_dir, native_sysroot, pseudo)

                self.source_file = rootfs

                # get the rootfs size in the right units for kickstart (kB)
                du_cmd = "du -Lbks %s" % rootfs
                out = exec_cmd(du_cmd)
                self.size = out.split()[0]

                break

    def prepare_rootfs_ext(self, rootfs, oe_builddir, rootfs_dir,
                           native_sysroot, pseudo):
        """
        Prepare content for an ext2/3/4 rootfs partition.
        """
        du_cmd = "du -ks %s" % rootfs_dir
        out = exec_cmd(du_cmd)
        actual_rootfs_size = int(out.split()[0])

        extra_blocks = self.get_extra_block_count(actual_rootfs_size)
        if extra_blocks < self.extra_space:
            extra_blocks = self.extra_space

        rootfs_size = actual_rootfs_size + extra_blocks
        rootfs_size *= self.overhead_factor

        msger.debug("Added %d extra blocks to %s to get to %d total blocks" % \
                    (extra_blocks, self.mountpoint, rootfs_size))

        dd_cmd = "dd if=/dev/zero of=%s bs=1024 seek=%d count=0 bs=1k" % \
            (rootfs, rootfs_size)
        exec_cmd(dd_cmd)

        extra_imagecmd = "-i 8192"

        label_str = ""
        if self.label:
            label_str = "-L %s" % self.label

        mkfs_cmd = "mkfs.%s -F %s %s %s -d %s" % \
            (self.fstype, extra_imagecmd, rootfs, label_str, rootfs_dir)
        exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)

    def prepare_rootfs_btrfs(self, rootfs, oe_builddir, rootfs_dir,
                             native_sysroot, pseudo):
        """
        Prepare content for a btrfs rootfs partition.

        Currently handles ext2/3/4 and btrfs.
        """
        du_cmd = "du -ks %s" % rootfs_dir
        out = exec_cmd(du_cmd)
        actual_rootfs_size = int(out.split()[0])

        extra_blocks = self.get_extra_block_count(actual_rootfs_size)
        if extra_blocks < self.extra_space:
            extra_blocks = self.extra_space

        rootfs_size = actual_rootfs_size + extra_blocks
        rootfs_size *= self.overhead_factor

        msger.debug("Added %d extra blocks to %s to get to %d total blocks" % \
                    (extra_blocks, self.mountpoint, rootfs_size))

        dd_cmd = "dd if=/dev/zero of=%s bs=1024 seek=%d count=0 bs=1k" % \
            (rootfs, rootfs_size)
        exec_cmd(dd_cmd)

        label_str = ""
        if self.label:
            label_str = "-L %s" % self.label

        mkfs_cmd = "mkfs.%s -b %d -r %s %s %s" % \
            (self.fstype, rootfs_size * 1024, rootfs_dir, label_str, rootfs)
        exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)

    def prepare_rootfs_vfat(self, rootfs, oe_builddir, rootfs_dir,
                            native_sysroot, pseudo):
        """
        Prepare content for a vfat rootfs partition.
        """
        du_cmd = "du -bks %s" % rootfs_dir
        out = exec_cmd(du_cmd)
        blocks = int(out.split()[0])

        extra_blocks = self.get_extra_block_count(blocks)
        if extra_blocks < self.extra_space:
            extra_blocks = self.extra_space

        blocks += extra_blocks

        msger.debug("Added %d extra blocks to %s to get to %d total blocks" % \
                    (extra_blocks, self.mountpoint, blocks))

        # Ensure total sectors is an integral number of sectors per
        # track or mcopy will complain. Sectors are 512 bytes, and we
        # generate images with 32 sectors per track. This calculation
        # is done in blocks, thus the mod by 16 instead of 32. Apply
        # sector count fix only when needed.
        if blocks % 16 != 0:
            blocks += (16 - (blocks % 16))

        label_str = "-n boot"
        if self.label:
            label_str = "-n %s" % self.label

        dosfs_cmd = "mkdosfs %s -S 512 -C %s %d" % (label_str, rootfs, blocks)
        exec_native_cmd(dosfs_cmd, native_sysroot)

        mcopy_cmd = "mcopy -i %s -s %s/* ::/" % (rootfs, rootfs_dir)
        exec_native_cmd(mcopy_cmd, native_sysroot)

        chmod_cmd = "chmod 644 %s" % rootfs
        exec_cmd(chmod_cmd)

    def prepare_rootfs_squashfs(self, rootfs, oe_builddir, rootfs_dir,
                                native_sysroot, pseudo):
        """
        Prepare content for a squashfs rootfs partition.
        """
        squashfs_cmd = "mksquashfs %s %s -noappend" % \
                       (rootfs_dir, rootfs)
        exec_native_cmd(squashfs_cmd, native_sysroot, pseudo=pseudo)

    def prepare_empty_partition_ext(self, rootfs, oe_builddir,
                                    native_sysroot):
        """
        Prepare an empty ext2/3/4 partition.
        """
        dd_cmd = "dd if=/dev/zero of=%s bs=1k seek=%d count=0" % \
            (rootfs, self.size)
        exec_cmd(dd_cmd)

        extra_imagecmd = "-i 8192"

        label_str = ""
        if self.label:
            label_str = "-L %s" % self.label

        mkfs_cmd = "mkfs.%s -F %s %s %s" % \
            (self.fstype, extra_imagecmd, label_str, rootfs)
        exec_native_cmd(mkfs_cmd, native_sysroot)

    def prepare_empty_partition_btrfs(self, rootfs, oe_builddir,
                                      native_sysroot):
        """
        Prepare an empty btrfs partition.
        """
        dd_cmd = "dd if=/dev/zero of=%s bs=1k seek=%d count=0" % \
            (rootfs, self.size)
        exec_cmd(dd_cmd)

        label_str = ""
        if self.label:
            label_str = "-L %s" % self.label

        mkfs_cmd = "mkfs.%s -b %d %s %s" % \
            (self.fstype, self.size * 1024, label_str, rootfs)
        exec_native_cmd(mkfs_cmd, native_sysroot)

    def prepare_empty_partition_vfat(self, rootfs, oe_builddir,
                                     native_sysroot):
        """
        Prepare an empty vfat partition.
        """
        blocks = self.size

        label_str = "-n boot"
        if self.label:
            label_str = "-n %s" % self.label

        dosfs_cmd = "mkdosfs %s -S 512 -C %s %d" % (label_str, rootfs, blocks)
        exec_native_cmd(dosfs_cmd, native_sysroot)

        chmod_cmd = "chmod 644 %s" % rootfs
        exec_cmd(chmod_cmd)

    def prepare_empty_partition_squashfs(self, cr_workdir, oe_builddir,
                                         native_sysroot):
        """
        Prepare an empty squashfs partition.
        """
        msger.warning("Creating of an empty squashfs %s partition was attempted. " \
                      "Proceeding as requested." % self.mountpoint)

        path = "%s/fs_%s.%s" % (cr_workdir, self.label, self.fstype)
        os.path.isfile(path) and os.remove(path)

        # it is not possible to create a squashfs without source data,
        # thus prepare an empty temp dir that is used as source
        tmpdir = tempfile.mkdtemp()

        squashfs_cmd = "mksquashfs %s %s -noappend" % \
                       (tmpdir, path)
        exec_native_cmd(squashfs_cmd, native_sysroot)

        os.rmdir(tmpdir)

        # get the rootfs size in the right units for kickstart (kB)
        du_cmd = "du -Lbks %s" % path
        out = exec_cmd(du_cmd)
        fs_size = out.split()[0]

        self.size = fs_size

    def prepare_swap_partition(self, cr_workdir, oe_builddir, native_sysroot):
        """
        Prepare a swap partition.
        """
        path = "%s/fs.%s" % (cr_workdir, self.fstype)

        dd_cmd = "dd if=/dev/zero of=%s bs=1k seek=%d count=0" % \
            (path, self.size)
        exec_cmd(dd_cmd)

        import uuid
        label_str = ""
        if self.label:
            label_str = "-L %s" % self.label
        mkswap_cmd = "mkswap %s -U %s %s" % (label_str, str(uuid.uuid1()), path)
        exec_native_cmd(mkswap_cmd, native_sysroot)