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# Copyright (C) 2012 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# 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.
import json
import logging
import os
import shutil
import time
from collections import defaultdict
import tarfile
import traceback
import subprocess
import cliapp
import morphlib
from morphlib.artifactcachereference import ArtifactCacheReference
from morphlib.builder2 import (SystemKindBuilder, download_depends,
get_overlaps, log_overlaps, ldconfig,
write_overlap_metadata)
class SyslinuxDiskBuilder(SystemKindBuilder): # pragma: no cover
system_kind = 'syslinux-disk'
def build_and_cache(self):
with self.build_watch('overall-build'):
arch = self.artifact.source.morphology['arch']
rootfs_artifact = self.new_artifact(
self.artifact.source.morphology['name'] + '-rootfs')
handle = self.local_artifact_cache.put(rootfs_artifact)
image_name = handle.name
self._create_image(image_name)
self._partition_image(image_name)
self._install_mbr(arch, image_name)
partition = self._setup_device_mapping(image_name)
mount_point = None
try:
self._create_fs(partition)
mount_point = self.staging_area.destdir(self.artifact.source)
self._mount(partition, mount_point)
factory_path = os.path.join(mount_point, 'factory')
self._create_subvolume(factory_path)
self._unpack_strata(factory_path)
self._create_fstab(factory_path)
if arch in ('x86', 'x86_64'):
self._create_extlinux_config(factory_path)
self._create_subvolume_snapshot(
mount_point, 'factory', 'factory-run')
factory_run_path = os.path.join(mount_point, 'factory-run')
self._install_boot_files(arch, factory_run_path, mount_point)
if arch in ('x86', 'x86_64'):
self._install_extlinux(mount_point)
if arch in ('arm',):
a = self.new_artifact(
self.artifact.source.morphology['name']+'-kernel')
with self.local_artifact_cache.put(a) as dest:
with open(os.path.join(factory_path,
'boot',
'zImage')) as kernel:
shutil.copyfileobj(kernel, dest)
self._unmount(mount_point)
except BaseException, e:
logging.error(traceback.format_exc())
self.app.status(msg='Error while building system',
error=True)
self._unmount(mount_point)
self._undo_device_mapping(image_name)
handle.abort()
raise
self._undo_device_mapping(image_name)
handle.close()
self.save_build_times()
return [self.artifact]
def _create_image(self, image_name):
self.app.status(msg='Creating disk image %(filename)s',
filename=image_name, chatty=True)
with self.build_watch('create-image'):
morphlib.fsutils.create_image(
self.app.runcmd, image_name,
self.artifact.source.morphology['disk-size'])
def _partition_image(self, image_name):
self.app.status(msg='Partitioning disk image %(filename)s',
filename=image_name)
with self.build_watch('partition-image'):
morphlib.fsutils.partition_image(self.app.runcmd, image_name)
def _install_mbr(self, arch, image_name):
self.app.status(msg='Installing mbr on disk image %(filename)s',
filename=image_name, chatty=True)
if arch not in ('x86', 'x86_64'):
return
with self.build_watch('install-mbr'):
morphlib.fsutils.install_syslinux_mbr(self.app.runcmd, image_name)
def _setup_device_mapping(self, image_name):
self.app.status(msg='Device mapping partitions in %(filename)s',
filename=image_name, chatty=True)
with self.build_watch('setup-device-mapper'):
return morphlib.fsutils.setup_device_mapping(self.app.runcmd,
image_name)
def _create_fs(self, partition):
self.app.status(msg='Creating filesystem on %(partition)s',
partition=partition, chatty=True)
with self.build_watch('create-filesystem'):
morphlib.fsutils.create_fs(self.app.runcmd, partition)
def _mount(self, partition, mount_point):
self.app.status(msg='Mounting %(partition)s on %(mount_point)s',
partition=partition, mount_point=mount_point,
chatty=True)
with self.build_watch('mount-filesystem'):
morphlib.fsutils.mount(self.app.runcmd, partition, mount_point)
def _create_subvolume(self, path):
self.app.status(msg='Creating subvolume %(path)s',
path=path, chatty=True)
with self.build_watch('create-factory-subvolume'):
self.app.runcmd(['btrfs', 'subvolume', 'create', path])
def _unpack_strata(self, path):
self.app.status(msg='Unpacking strata to %(path)s',
path=path, chatty=True)
with self.build_watch('unpack-strata'):
# download the stratum artifacts if necessary
download_depends(self.artifact.dependencies,
self.local_artifact_cache,
self.remote_artifact_cache,
('meta',))
# download the chunk artifacts if necessary
for stratum_artifact in self.artifact.dependencies:
f = self.local_artifact_cache.get(stratum_artifact)
chunks = [ArtifactCacheReference(a) for a in json.load(f)]
download_depends(chunks,
self.local_artifact_cache,
self.remote_artifact_cache)
f.close()
# check whether the strata overlap
overlaps = get_overlaps(self.artifact, self.artifact.dependencies,
self.local_artifact_cache)
if len(overlaps) > 0:
self.app.status(msg='Overlaps in system artifact '
'%(artifact_name)s detected',
artifact_name=self.artifact.name,
error=True)
log_overlaps(overlaps)
write_overlap_metadata(self.artifact, overlaps,
self.local_artifact_cache)
# unpack it from the local artifact cache
for stratum_artifact in self.artifact.dependencies:
f = self.local_artifact_cache.get(stratum_artifact)
for chunk in (ArtifactCacheReference(a) for a in json.load(f)):
self.app.status(msg='Unpacking chunk %(basename)s',
basename=chunk.basename(), chatty=True)
chunk_handle = self.local_artifact_cache.get(chunk)
morphlib.bins.unpack_binary_from_file(chunk_handle, path)
chunk_handle.close()
f.close()
meta = self.local_artifact_cache.get_artifact_metadata(
stratum_artifact, 'meta')
dst = morphlib.savefile.SaveFile(
os.path.join(path, 'baserock',
'%s.meta' % stratum_artifact.name), 'w')
shutil.copyfileobj(meta, dst)
dst.close()
meta.close()
ldconfig(self.app.runcmd, path)
def _create_fstab(self, path):
self.app.status(msg='Creating fstab in %(path)s',
path=path, chatty=True)
with self.build_watch('create-fstab'):
fstab = os.path.join(path, 'etc', 'fstab')
if not os.path.exists(os.path.dirname(fstab)):# FIXME: should exist
os.makedirs(os.path.dirname(fstab))
with open(fstab, 'w') as f:
f.write('proc /proc proc defaults 0 0\n')
f.write('sysfs /sys sysfs defaults 0 0\n')
f.write('/dev/sda1 / btrfs defaults,rw,noatime 0 1\n')
def _create_extlinux_config(self, path):
self.app.status(msg='Creating extlinux.conf in %(path)s',
path=path, chatty=True)
with self.build_watch('create-extlinux-config'):
config = os.path.join(path, 'extlinux.conf')
with open(config, 'w') as f:
f.write('default linux\n')
f.write('timeout 1\n')
f.write('label linux\n')
f.write('kernel /boot/vmlinuz\n')
f.write('append root=/dev/sda1 rootflags=subvol=factory-run '
'init=/sbin/init rw\n')
def _create_subvolume_snapshot(self, path, source, target):
self.app.status(msg='Creating subvolume snapshot '
'%(source)s to %(target)s',
source=source, target=target, chatty=True)
with self.build_watch('create-runtime-snapshot'):
self.app.runcmd(['btrfs', 'subvolume', 'snapshot', source, target],
cwd=path)
def _install_boot_files(self, arch, sourcefs, targetfs):
with self.build_watch('install-boot-files'):
if arch in ('x86', 'x86_64'):
self.app.status(msg='Installing boot files into root volume',
chatty=True)
shutil.copy2(os.path.join(sourcefs, 'extlinux.conf'),
os.path.join(targetfs, 'extlinux.conf'))
os.mkdir(os.path.join(targetfs, 'boot'))
shutil.copy2(os.path.join(sourcefs, 'boot', 'vmlinuz'),
os.path.join(targetfs, 'boot', 'vmlinuz'))
shutil.copy2(os.path.join(sourcefs, 'boot', 'System.map'),
os.path.join(targetfs, 'boot', 'System.map'))
def _install_extlinux(self, path):
self.app.status(msg='Installing extlinux to %(path)s',
path=path, chatty=True)
with self.build_watch('install-bootloader'):
self.app.runcmd(['extlinux', '--install', path])
# FIXME this hack seems to be necessary to let extlinux finish
self.app.runcmd(['sync'])
time.sleep(2)
def _unmount(self, mount_point):
with self.build_watch('unmount-filesystem'):
if mount_point is not None:
self.app.status(msg='Unmounting %(mount_point)s',
mount_point=mount_point, chatty=True)
morphlib.fsutils.unmount(self.app.runcmd, mount_point)
def _undo_device_mapping(self, image_name):
self.app.status(msg='Undoing device mappings for %(filename)s',
filename=image_name, chatty=True)
with self.build_watch('undo-device-mapper'):
morphlib.fsutils.undo_device_mapping(self.app.runcmd, image_name)
class SyslinuxDiskBuilderPlugin(cliapp.Plugin):
def enable(self):
# Only provide this system builder on architectures that are
# supported by syslinux.
if morphlib.util.arch() in ['x86_64', 'i386', 'i486', 'i586', 'i686']:
self.app.system_kind_builder_factory.register(SyslinuxDiskBuilder)
def disable(self):
pass
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