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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
import re
def create_image(runcmd, image_name, size):
# FIXME a pure python implementation may be better
runcmd(['dd', 'if=/dev/zero', 'of=' + image_name, 'bs=1',
'seek=%d' % size, 'count=0'])
def partition_image(runcmd, image_name):
# FIXME make this more flexible with partitioning options
runcmd(['sfdisk', image_name], feed_stdin='1,,83,*\n')
def setup_device_mapping(runcmd, image_name):
findstart = re.compile(r"start=\s+(\d+),")
out = runcmd(['sfdisk', '-d', image_name])
for line in out.splitlines():
match = findstart.search(line)
if match is None:
continue
start = int(match.group(1)) * 512
if start != 0:
break
device = runcmd(['losetup', '--show', '-o', str(start), '-f', image_name])
return device.strip()
def create_fs(runcmd, partition):
runcmd(['mkfs.btrfs', '-L', 'baserock', partition])
def mount(runcmd, partition, mount_point):
if not os.path.exists(mount_point):
os.mkdir(mount_point)
runcmd(['mount', partition, mount_point])
def unmount(runcmd, mount_point):
runcmd(['umount', mount_point])
def undo_device_mapping(runcmd, image_name):
out = runcmd(['losetup', '-j', image_name])
for line in out.splitlines():
i = line.find(':')
device = line[:i]
runcmd(['losetup', '-d', device])
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