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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 os
def create_image(ex, image_name, size):
# FIXME a pure python implementation may be better
ex.runv(['dd', 'if=/dev/zero', 'of=' + image_name, 'bs=1',
'seek=%d' % size, 'count=0'])
def partition_image(ex, image_name):
# FIXME make this more flexible with partitioning options
ex.runv(['sfdisk', image_name], feed_stdin='1,,83,*\n')
def install_mbr(ex, image_name):
for path in ['/usr/lib/extlinux/mbr.bin',
'/usr/share/syslinux/mbr.bin']:
if os.path.exists(path):
ex.runv(['dd', 'if=' + path, 'of=' + image_name,
'conv=notrunc'])
break
def setup_device_mapping(ex, image_name):
out = ex.runv(['sfdisk', '-d', image_name])
for line in out.splitlines():
words = line.split()
if (len(words) >= 4 and
words[2] == 'start=' and
words[3] != '0,'):
n = int(words[3][:-1]) # skip trailing comma
start = n * 512
break
ex.runv(['losetup', '-o', str(start), '-f', image_name])
out = ex.runv(['losetup', '-j', image_name])
line = out.strip()
i = line.find(':')
return line[:i]
def create_fs(ex, partition):
# FIXME: the hardcoded size of 4GB is icky but the default broke
# when we used mkfs -t ext4
ex.runv(['mkfs', '-t', 'btrfs', '-L', 'baserock',
'-b', '4294967296', partition])
def mount(ex, partition, mount_point):
os.mkdir(mount_point)
ex.runv(['mount', partition, mount_point])
def unmount(ex, mount_point):
ex.runv(['umount', mount_point])
def undo_device_mapping(ex, image_name):
out = ex.runv(['losetup', '-j', image_name])
for line in out.splitlines():
i = line.find(':')
device = line[:i]
ex.runv(['losetup', '-d', device])
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