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"""
Base for common utility functions
"""
# -*- coding: utf-8 -*-
#
# base.py
#
# Copyright 2015 Neil Williams <codehelp@debian.org>
#
# 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
import os
import crypt
import shutil
import logging
import subprocess
import cliapp
# pylint: disable=missing-docstring
def runcmd(argv, stdin='', ignore_fail=False, env=None, **kwargs):
logging.debug('runcmd: %s %s %s', argv, env, kwargs)
proc = subprocess.Popen(
argv, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.PIPE,
env=env, **kwargs)
out, err = proc.communicate(stdin)
if proc.returncode != 0:
msg = 'command failed: %s\n%s\n%s' % (argv, out, err)
logging.error(msg)
if not ignore_fail:
raise cliapp.AppException(msg)
return out
# FIXME: use contextmanager
def mount_wrapper(rootdir):
runcmd(['mount', '/dev', '-t', 'devfs', '-obind',
'%s' % os.path.join(rootdir, 'dev')])
runcmd(['mount', '/dev/pts', '-t', 'devpts', '-obind',
'%s' % os.path.join(rootdir, 'dev', 'pts')])
runcmd(['mount', '/proc', '-t', 'proc', '-obind',
'%s' % os.path.join(rootdir, 'proc')])
runcmd(['mount', '/sys', '-t', 'sysfs', '-obind',
'%s' % os.path.join(rootdir, 'sys')])
def umount_wrapper(rootdir):
runcmd(['umount', os.path.join(rootdir, 'sys')])
runcmd(['umount', os.path.join(rootdir, 'proc')])
runcmd(['umount', os.path.join(rootdir, 'dev', 'pts')])
runcmd(['umount', os.path.join(rootdir, 'dev')])
def cleanup_apt_cache(rootdir):
out = runcmd(['chroot', rootdir, 'apt-get', 'clean'])
logging.debug('stdout:\n%s', out)
def set_password(rootdir, user, password):
encrypted = crypt.crypt(password, '..')
runcmd(['chroot', rootdir, 'usermod', '-p', encrypted, user])
def delete_password(rootdir, user):
runcmd(['chroot', rootdir, 'passwd', '-d', user])
def copy_files(src, dest):
for filename in os.listdir(src):
src_path = os.path.join(src, filename)
if os.path.isdir(src_path) or os.path.islink(src_path):
continue
shutil.copyfile(
src_path,
os.path.join(dest, filename))
class Base(object):
name = 'base'
def __init__(self):
super(Base, self).__init__()
self.settings = None
def define_settings(self, settings):
self.settings = settings
def message(self, msg):
logging.info(msg)
if self.settings['verbose']:
print(msg) # pylint: disable=superfluous-parens
def create_empty_image(self):
self.message('Creating disk image')
runcmd(['qemu-img', 'create', '-f', 'raw',
self.settings['image'],
str(self.settings['size'])])
def create_tarball(self, rootdir):
# Create a tarball of the disk's contents
# shell out to runcmd since it more easily handles rootdir
self.message('Creating tarball of disk contents')
runcmd(['tar', '-cf', self.settings['tarball'], '-C', rootdir, '.'])
def mkfs(self, device, fstype):
self.message('Creating filesystem %s' % fstype)
runcmd(['mkfs', '-t', fstype, device])
def set_root_password(self, rootdir):
if self.settings['root-password']:
self.message('Setting root password')
set_password(rootdir, 'root', self.settings['root-password'])
elif self.settings['lock-root-password']:
self.message('Locking root password')
runcmd(['chroot', rootdir, 'passwd', '-l', 'root'])
else:
self.message('Give root an empty password')
delete_password(rootdir, 'root')
def create_users(self, rootdir):
def create_user(vmuser):
runcmd(['chroot', rootdir, 'adduser', '--gecos', vmuser,
'--disabled-password', vmuser])
if self.settings['sudo']:
runcmd(['chroot', rootdir, 'adduser', vmuser, 'sudo'])
for userpass in self.settings['user']:
if '/' in userpass:
user, password = userpass.split('/', 1)
create_user(user)
set_password(rootdir, user, password)
else:
create_user(userpass)
delete_password(rootdir, userpass)
def customize(self, rootdir):
script = self.settings['customize']
if not script:
return
if not os.path.exists(script):
example = os.path.join("/usr/share/vmdebootstrap/examples/", script)
if not os.path.exists(example):
self.message("Unable to find %s" % script)
return
script = example
self.message('Running customize script %s' % script)
logging.info("rootdir=%s", rootdir)
try:
with open('/dev/tty', 'w') as tty:
cliapp.runcmd([script, rootdir, self.settings['image']], stdout=tty, stderr=tty)
except IOError:
logging.debug('tty unavailable, trying in headless mode.')
subprocess.call([script, rootdir, self.settings['image']])
def append_serial_console(self, rootdir):
if self.settings['serial-console']:
serial_command = self.settings['serial-console-command']
logging.debug('adding getty to serial console')
inittab = os.path.join(rootdir, 'etc/inittab')
# to autologin, serial_command can contain '-a root'
with open(inittab, 'a') as ftab:
ftab.write('\nS0:23:respawn:%s\n' % serial_command)
def check_swap_size(self):
# swap - modifies extent
extent = '100%'
swap = 256 * 1024 * 1024
if self.settings['swap'] > 0:
if self.settings['swap'] > swap:
swap = self.settings['swap']
else:
# minimum 256MB as default qemu ram is 128MB
logging.debug("Setting minimum 256MB swap space")
extent = "%s%%" % int(100 * (self.settings['size'] - swap) / self.settings['size'])
return extent
def make_swap(self, extent):
if self.settings['swap'] > 0:
logging.debug("Creating swap partition")
runcmd([
'parted', '-s', self.settings['image'],
'mkpart', 'primary', 'linux-swap', extent, '100%'])
def base_packages(self):
packages = []
if not self.settings['foreign'] and not self.settings['no-acpid']:
packages.append('acpid')
if self.settings['sudo']:
packages.append('sudo')
if not self.settings['no-kernel']:
if self.settings['kernel-package']:
packages.append(self.settings['kernel-package'])
return packages
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