vmdebootstrap

   1 #!/usr/bin/python
   2 # Copyright 2011-2013  Lars Wirzenius
   3 # Copyright 2012  Codethink Limited
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 3 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 import cliapp
  19 import crypt
  20 import logging
  21 import os
  22 import re
  23 import shutil
  24 import subprocess
  25 import tempfile
  26 import time
  27
  28
  29 __version__ = '0.3'
  30
  31
  32 class VmDebootstrap(cliapp.Application):
  33
  34     def add_settings(self):
  35         default_arch = subprocess.check_output(
  36             ["dpkg", "--print-architecture"]).strip()
  37
  38         self.settings.boolean(['verbose'], 'report what is going on')
  39         self.settings.string(['image'], 'put created disk image in FILE',
  40                              metavar='FILE')
  41         self.settings.bytesize(['size'],
  42                                'create a disk image of size SIZE (%default)',
  43                                metavar='SIZE',
  44                                default='1G')
  45         self.settings.bytesize(['bootsize'],
  46                                'create boot partition of size SIZE (%default)',
  47                                metavar='BOOTSIZE',
  48                                default='0%')
  49         self.settings.string(['boottype'],
  50                              'specify file system type for /boot/',
  51                              default='ext2')
  52         self.settings.string(['foreign'],
  53                              'set up foreign debootstrap environment using provided program (ie binfmt handler)')
  54         self.settings.string(['variant'],
  55                              'select debootstrap variant it not using the default')
  56         self.settings.boolean(
  57             ['extlinux'],
  58             'install extlinux?',
  59             default=True)
  60         self.settings.string(['tarball'], "tar up the disk's contents in FILE",
  61                              metavar='FILE')
  62         self.settings.string(['mirror'],
  63                              'use MIRROR as package source (%default)',
  64                              metavar='URL',
  65                              default='http://cdn.debian.net/debian/')
  66         self.settings.string(['arch'], 'architecture to use (%default)',
  67                              metavar='ARCH',
  68                              default=default_arch)
  69         self.settings.string(['distribution'],
  70                              'release to use (%default)',
  71                              metavar='NAME',
  72                              default='stable')
  73         self.settings.string_list(['package'], 'install PACKAGE onto system')
  74         self.settings.string_list(['custom-package'],
  75                                   'install package in DEB file onto system '
  76                                   '(not from mirror)',
  77                                   metavar='DEB')
  78         self.settings.boolean(['no-kernel'], 'do not install a linux package')
  79         self.settings.boolean(['enable-dhcp'], 'enable DHCP on eth0')
  80         self.settings.string(['root-password'], 'set root password',
  81                              metavar='PASSWORD')
  82         self.settings.boolean(['lock-root-password'],
  83                               'lock root account so they cannot login?')
  84         self.settings.string(['customize'],
  85                              'run SCRIPT after setting up system',
  86                              metavar='SCRIPT')
  87         self.settings.string(['hostname'],
  88                              'set name to HOSTNAME (%default)',
  89                              metavar='HOSTNAME',
  90                              default='debian')
  91         self.settings.string_list(['user'],
  92                                   'create USER with PASSWORD',
  93                                   metavar='USER/PASSWORD')
  94         self.settings.boolean(['serial-console'],
  95                               'configure image to use a serial console')
  96         self.settings.string(['serial-console-command'],
  97                              'command to manage the serial console, appended '
  98                              'to /etc/inittab (%default)',
  99                              metavar='COMMAND',
 100                              default='/sbin/getty -L ttyS0 115200 vt100')
 101         self.settings.boolean(['sudo'],
 102                               'install sudo, and if user is created, add them '
 103                               'to sudo group')
 104         self.settings.string(['owner'],
 105                              'the user who will own the image when the build '
 106                              'is complete.')
 107         self.settings.boolean(['squash'],
 108                               'use squashfs on the final image.')
 109         self.settings.boolean(['configure-apt'],
 110                               'Create an apt source based on the distribution '
 111                               'and mirror selected.')
 112         self.settings.boolean(['mbr'],
 113                               'Run install-mbr (no longer done by default)')
 114         self.settings.boolean(['grub'],
 115                               'Install and configure grub2 - disables '
 116                               'extlinux.')
 117
 118     def process_args(self, args):
 119         if not self.settings['image'] and not self.settings['tarball']:
 120             raise cliapp.AppException('You must give disk image filename, '
 121                                       'or tarball filename')
 122         if self.settings['image'] and not self.settings['size']:
 123             raise cliapp.AppException('If disk image is specified, '
 124                                       'You must give image size.')
 125
 126         self.remove_dirs = []
 127         self.mount_points = []
 128
 129         try:
 130             rootdev = None
 131             roottype = 'ext4'
 132             bootdev = None
 133             boottype = None
 134             rootdir = None
 135             if self.settings['image']:
 136                 self.create_empty_image()
 137                 self.partition_image()
 138                 if self.settings['mbr']:
 139                     self.install_mbr()
 140                 (rootdev, bootdev) = self.setup_kpartx()
 141                 self.mkfs(rootdev, type=roottype)
 142                 rootdir = self.mount(rootdev)
 143                 if bootdev:
 144                     if self.settings['boottype']:
 145                         boottype = self.settings['boottype']
 146                     else:
 147                         boottype = 'ext2'
 148                     self.mkfs(bootdev, type=boottype)
 149                     bootdir = '%s/%s' % (rootdir, 'boot/')
 150                     os.mkdir(bootdir)
 151                     bootdir = self.mount(bootdev, bootdir)
 152             else:
 153                 rootdir = self.mkdtemp()
 154             self.debootstrap(rootdir)
 155             self.set_hostname(rootdir)
 156             self.create_fstab(rootdir, rootdev, roottype, bootdev, boottype)
 157             self.install_debs(rootdir)
 158             self.cleanup_apt_cache(rootdir)
 159             self.set_root_password(rootdir)
 160             self.create_users(rootdir)
 161             self.remove_udev_persistent_rules(rootdir)
 162             self.setup_networking(rootdir)
 163             if self.settings['configure-apt']:
 164                 self.configure_apt(rootdir)
 165             self.customize(rootdir)
 166             if self.settings['image']:
 167                 if self.settings['grub']:
 168                     self.install_grub2(rootdev, rootdir)
 169                 elif self.settings['extlinux']:
 170                     self.install_extlinux(rootdev, rootdir)
 171                 self.append_serial_console(rootdir)
 172                 self.optimize_image(rootdir)
 173                 if self.settings['squash']:
 174                     self.squash()
 175
 176             if self.settings['foreign']:
 177                 os.unlink('%s/usr/bin/%s' %
 178                           (rootdir, os.path.basename(self.settings['foreign'])))
 179
 180             if self.settings['tarball']:
 181                 self.create_tarball(rootdir)
 182
 183             if self.settings['owner']:
 184                 self.chown(rootdir)
 185         except BaseException, e:
 186             self.message('EEEK! Something bad happened...')
 187             if rootdir:
 188                 db_log = os.path.join(rootdir, 'debootstrap', 'debootstrap.log')
 189                 if os.path.exists(db_log):
 190                     shutil.copy(db_log, os.getcwd())
 191             self.message(e)
 192             self.cleanup_system()
 193             raise
 194         else:
 195             self.cleanup_system()
 196
 197     def message(self, msg):
 198         logging.info(msg)
 199         if self.settings['verbose']:
 200             print msg
 201
 202     def runcmd(self, argv, stdin='', ignore_fail=False, env=None, **kwargs):
 203         logging.debug('runcmd: %s %s %s' % (argv, env, kwargs))
 204         p = subprocess.Popen(argv, stdin=subprocess.PIPE,
 205                              stdout=subprocess.PIPE, stderr=subprocess.PIPE,
 206                              env=env, **kwargs)
 207         out, err = p.communicate(stdin)
 208         if p.returncode != 0:
 209             msg = 'command failed: %s\n%s\n%s' % (argv, out, err)
 210             logging.error(msg)
 211             if not ignore_fail:
 212                 raise cliapp.AppException(msg)
 213         return out
 214
 215     def mkdtemp(self):
 216         dirname = tempfile.mkdtemp()
 217         self.remove_dirs.append(dirname)
 218         logging.debug('mkdir %s' % dirname)
 219         return dirname
 220
 221     def mount(self, device, path=None):
 222         if not path:
 223             mount_point = self.mkdtemp()
 224         else:
 225             mount_point = path
 226         self.message('Mounting %s on %s' % (device, mount_point))
 227         self.runcmd(['mount', device, mount_point])
 228         self.mount_points.append(mount_point)
 229         logging.debug('mounted %s on %s' % (device, mount_point))
 230         return mount_point
 231
 232     def create_empty_image(self):
 233         self.message('Creating disk image')
 234         self.runcmd(['qemu-img', 'create', '-f', 'raw',
 235                      self.settings['image'],
 236                      str(self.settings['size'])])
 237
 238     def partition_image(self):
 239         self.message('Creating partitions')
 240         self.runcmd(['parted', '-s', self.settings['image'],
 241                      'mklabel', 'msdos'])
 242         if self.settings['bootsize'] and self.settings['bootsize'] is not '0%':
 243             bootsize = str(self.settings['bootsize'] / (1024 * 1024))
 244             self.runcmd(['parted', '-s', self.settings['image'],
 245                          'mkpart', 'primary', 'fat16', '0', bootsize])
 246         else:
 247             bootsize = '0%'
 248         self.runcmd(['parted', '-s', self.settings['image'],
 249                      'mkpart', 'primary', bootsize, '100%'])
 250         self.runcmd(['parted', '-s', self.settings['image'],
 251                      'set', '1', 'boot', 'on'])
 252
 253     def install_mbr(self):
 254         if os.path.exists("/sbin/install-mbr"):
 255             self.message('Installing MBR')
 256             self.runcmd(['install-mbr', self.settings['image']])
 257
 258     def setup_kpartx(self):
 259         out = self.runcmd(['kpartx', '-avs', self.settings['image']])
 260         if self.settings['bootsize']:
 261             bootindex = 0
 262             rootindex = 1
 263             parts = 2
 264         else:
 265             rootindex = 0
 266             parts = 1
 267             boot = None
 268         devices = [line.split()[2]
 269                    for line in out.splitlines()
 270                    if line.startswith('add map ')]
 271         if len(devices) != parts:
 272             raise cliapp.AppException('Surprising number of partitions')
 273         root = '/dev/mapper/%s' % devices[rootindex]
 274         if self.settings['bootsize']:
 275             boot = '/dev/mapper/%s' % devices[bootindex]
 276         return (root, boot)
 277
 278     def mkfs(self, device, type):
 279         self.message('Creating filesystem %s' % type)
 280         self.runcmd(['mkfs', '-t', type, device])
 281
 282     def debootstrap(self, rootdir):
 283         self.message('Debootstrapping')
 284
 285         if self.settings['foreign']:
 286             necessary_packages = []
 287         else:
 288             necessary_packages = ['acpid']
 289
 290         if self.settings['grub']:
 291             necessary_packages.append('grub2')
 292
 293         include = self.settings['package']
 294
 295         if not self.settings['no-kernel']:
 296             if self.settings['arch'] == 'i386':
 297                 kernel_arch = '486'
 298             else:
 299                 kernel_arch = self.settings['arch']
 300             kernel_image = 'linux-image-%s' % kernel_arch
 301             include.append(kernel_image)
 302
 303         if self.settings['sudo'] and 'sudo' not in include:
 304             include.append('sudo')
 305
 306         args = ['debootstrap', '--arch=%s' % self.settings['arch']]
 307         if self.settings['package'] and len(necessary_packages) > 0:
 308             args.append(
 309                 '--include=%s' % ','.join(necessary_packages + include))
 310         if self.settings['foreign']:
 311             args.append('--foreign')
 312         if self.settings['variant']:
 313             args.append('--variant')
 314             args.append(self.settings['variant'])
 315         args += [self.settings['distribution'],
 316                  rootdir, self.settings['mirror']]
 317         logging.debug(" ".join(args))
 318         self.runcmd(args)
 319         if self.settings['foreign']:
 320             # set a noninteractive debconf environment for secondstage
 321             env = {
 322                 "DEBIAN_FRONTEND": "noninteractive",
 323                 "DEBCONF_NONINTERACTIVE_SEEN": "true",
 324                 "LC_ALL": "C"
 325             }
 326             # add the mapping to the complete environment.
 327             env.update(os.environ)
 328             # First copy the binfmt handler over
 329             self.message('Setting up binfmt handler')
 330             shutil.copy(self.settings['foreign'], '%s/usr/bin/' % rootdir)
 331             # Next, run the package install scripts etc.
 332             self.message('Running debootstrap second stage')
 333             self.runcmd(['chroot', rootdir,
 334                          '/debootstrap/debootstrap', '--second-stage'],
 335                         env=env)
 336
 337     def set_hostname(self, rootdir):
 338         hostname = self.settings['hostname']
 339         with open(os.path.join(rootdir, 'etc', 'hostname'), 'w') as f:
 340             f.write('%s\n' % hostname)
 341
 342         etc_hosts = os.path.join(rootdir, 'etc', 'hosts')
 343         try:
 344             with open(etc_hosts, 'r') as f:
 345                 data = f.read()
 346             with open(etc_hosts, 'w') as f:
 347                 for line in data.splitlines():
 348                     if line.startswith('127.0.0.1'):
 349                         line += ' %s' % hostname
 350                     f.write('%s\n' % line)
 351         except IOError, e:
 352             pass
 353
 354     def create_fstab(self, rootdir, rootdev, roottype, bootdev, boottype):
 355         def fsuuid(device):
 356             out = self.runcmd(['blkid', '-c', '/dev/null', '-o', 'value',
 357                                '-s', 'UUID', device])
 358             return out.splitlines()[0].strip()
 359
 360         if rootdev:
 361             rootdevstr = 'UUID=%s' % fsuuid(rootdev)
 362         else:
 363             rootdevstr = '/dev/sda1'
 364
 365         if bootdev:
 366             bootdevstr = 'UUID=%s' % fsuuid(bootdev)
 367         else:
 368             bootdevstr = None
 369
 370         fstab = os.path.join(rootdir, 'etc', 'fstab')
 371         with open(fstab, 'w') as f:
 372             f.write('proc /proc proc defaults 0 0\n')
 373             f.write('%s / %s errors=remount-ro 0 1\n' % (rootdevstr, roottype))
 374             if bootdevstr:
 375                 f.write('%s /boot %s errors=remount-ro 0 2\n' % (bootdevstr, boottype))
 376
 377     def install_debs(self, rootdir):
 378         if not self.settings['custom-package']:
 379             return
 380         self.message('Installing custom packages')
 381         tmp = os.path.join(rootdir, 'tmp', 'install_debs')
 382         os.mkdir(tmp)
 383         for deb in self.settings['custom-package']:
 384             shutil.copy(deb, tmp)
 385         filenames = [os.path.join('/tmp/install_debs', os.path.basename(deb))
 386                      for deb in self.settings['custom-package']]
 387         out, err, exit = \
 388             self.runcmd_unchecked(['chroot', rootdir, 'dpkg', '-i'] + filenames)
 389         logging.debug('stdout:\n%s' % out)
 390         logging.debug('stderr:\n%s' % err)
 391         out = self.runcmd(['chroot', rootdir,
 392                           'apt-get', '-f', '--no-remove', 'install'])
 393         logging.debug('stdout:\n%s' % out)
 394         shutil.rmtree(tmp)
 395
 396     def cleanup_apt_cache(self, rootdir):
 397         out = self.runcmd(['chroot', rootdir, 'apt-get', 'clean'])
 398         logging.debug('stdout:\n%s' % out)
 399
 400     def set_root_password(self, rootdir):
 401         if self.settings['root-password']:
 402             self.message('Setting root password')
 403             self.set_password(rootdir, 'root', self.settings['root-password'])
 404         elif self.settings['lock-root-password']:
 405             self.message('Locking root password')
 406             self.runcmd(['chroot', rootdir, 'passwd', '-l', 'root'])
 407         else:
 408             self.message('Give root an empty password')
 409             self.delete_password(rootdir, 'root')
 410
 411     def create_users(self, rootdir):
 412         def create_user(user):
 413             self.runcmd(['chroot', rootdir, 'adduser', '--gecos', user,
 414                          '--disabled-password', user])
 415             if self.settings['sudo']:
 416                 self.runcmd(['chroot', rootdir, 'adduser', user, 'sudo'])
 417
 418         for userpass in self.settings['user']:
 419             if '/' in userpass:
 420                 user, password = userpass.split('/', 1)
 421                 create_user(user)
 422                 self.set_password(rootdir, user, password)
 423             else:
 424                 create_user(userpass)
 425                 self.delete_password(rootdir, userpass)
 426
 427     def set_password(self, rootdir, user, password):
 428         encrypted = crypt.crypt(password, '..')
 429         self.runcmd(['chroot', rootdir, 'usermod', '-p', encrypted, user])
 430
 431     def delete_password(self, rootdir, user):
 432         self.runcmd(['chroot', rootdir, 'passwd', '-d', user])
 433
 434     def remove_udev_persistent_rules(self, rootdir):
 435         self.message('Removing udev persistent cd and net rules')
 436         for x in ['70-persistent-cd.rules', '70-persistent-net.rules']:
 437             pathname = os.path.join(rootdir, 'etc', 'udev', 'rules.d', x)
 438             if os.path.exists(pathname):
 439                 logging.debug('rm %s' % pathname)
 440                 os.remove(pathname)
 441             else:
 442                 logging.debug('not removing non-existent %s' % pathname)
 443
 444     def setup_networking(self, rootdir):
 445         self.message('Setting up networking')
 446
 447         f = open(os.path.join(rootdir, 'etc', 'network', 'interfaces'), 'w')
 448         f.write('auto lo\n')
 449         f.write('iface lo inet loopback\n')
 450
 451         if self.settings['enable-dhcp']:
 452             f.write('\n')
 453             f.write('auto eth0\n')
 454             f.write('iface eth0 inet dhcp\n')
 455
 456         f.close()
 457
 458     def append_serial_console(self, rootdir):
 459         if self.settings['serial-console']:
 460             serial_command = self.settings['serial-console-command']
 461             logging.debug('adding getty to serial console')
 462             inittab = os.path.join(rootdir, 'etc/inittab')
 463             with open(inittab, 'a') as f:
 464                 f.write('\nS0:23:respawn:%s\n' % serial_command)
 465
 466     def install_grub2(self, rootdev, rootdir):
 467         self.message("Configuring grub2")
 468         # rely on kpartx using consistent naming to map loop0p1 to loop0
 469         install_dev = os.path.join('/dev', os.path.basename(rootdev)[:-2])
 470         self.runcmd(['mount', '/dev', '-t', 'devfs', '-obind',
 471                     '%s' % os.path.join(rootdir, 'dev')])
 472         self.runcmd(['mount', '/proc', '-t', 'proc', '-obind',
 473                     '%s' % os.path.join(rootdir, 'proc')])
 474         self.runcmd(['mount', '/sys', '-t', 'sysfs', '-obind',
 475                     '%s' % os.path.join(rootdir, 'sys')])
 476         try:
 477             self.runcmd(['chroot', rootdir, 'update-grub'])
 478             self.runcmd(['chroot', rootdir, 'grub-install', install_dev])
 479         except cliapp.AppException as e:
 480             self.message("Failed to configure grub2. Using extlinux.")
 481         self.runcmd(['umount', os.path.join(rootdir, 'sys')])
 482         self.runcmd(['umount', os.path.join(rootdir, 'proc')])
 483         self.runcmd(['umount', os.path.join(rootdir, 'dev')])
 484         self.install_extlinux(rootdev, rootdir)
 485
 486     def install_extlinux(self, rootdev, rootdir):
 487         if not os.path.exists("/usr/bin/extlinux"):
 488             self.message("extlinux not installed, skipping.")
 489             return
 490         self.message('Installing extlinux')
 491
 492         def find(pattern):
 493             dirname = os.path.join(rootdir, 'boot')
 494             basenames = os.listdir(dirname)
 495             logging.debug('find: %s' % basenames)
 496             for basename in basenames:
 497                 if re.search(pattern, basename):
 498                     return os.path.join('boot', basename)
 499             raise cliapp.AppException('Cannot find match: %s' % pattern)
 500
 501         try:
 502             kernel_image = find('vmlinuz-.*')
 503             initrd_image = find('initrd.img-.*')
 504         except cliapp.AppException as e:
 505             self.message("Unable to find kernel. Not installing extlinux.")
 506             logging.debug("No kernel found. %s. Skipping install of extlinux." % e)
 507             return
 508
 509         out = self.runcmd(['blkid', '-c', '/dev/null', '-o', 'value',
 510                            '-s', 'UUID', rootdev])
 511         uuid = out.splitlines()[0].strip()
 512
 513         conf = os.path.join(rootdir, 'extlinux.conf')
 514         logging.debug('configure extlinux %s' % conf)
 515         f = open(conf, 'w')
 516         f.write('''
 517 default linux
 518 timeout 1
 519
 520 label linux
 521 kernel %(kernel)s
 522 append initrd=%(initrd)s root=UUID=%(uuid)s ro %(kserial)s
 523 %(extserial)s
 524 ''' % {
 525             'kernel': kernel_image,
 526             'initrd': initrd_image,
 527             'uuid': uuid,
 528             'kserial':
 529             'console=ttyS0,115200' if self.settings['serial-console'] else '',
 530             'extserial': 'serial 0 115200' if self.settings['serial-console'] else '',
 531         })
 532         f.close()
 533
 534         self.runcmd(['extlinux', '--install', rootdir])
 535         self.runcmd(['sync'])
 536         time.sleep(2)
 537
 538     def optimize_image(self, rootdir):
 539         """
 540         Filing up the image with zeros will increase its compression rate
 541         """
 542         zeros = os.path.join(rootdir, 'ZEROS')
 543         self.runcmd_unchecked(['dd', 'if=/dev/zero', 'of=' + zeros, 'bs=1M'])
 544         self.runcmd(['rm', '-f', zeros])
 545
 546     def squash(self):
 547         """
 548         Run squashfs on the image.
 549         """
 550         if not os.path.exists('/usr/bin/mksquashfs'):
 551             logging.warning("Squash selected but mksquashfs not found!")
 552             return
 553         self.message("Running mksquashfs")
 554         suffixed = "%s.squashfs" % self.settings['image']
 555         self.runcmd(['mksquashfs', self.settings['image'],
 556                      suffixed,
 557                      '-no-progress', '-comp', 'xz'], ignore_fail=False)
 558         os.unlink(self.settings['image'])
 559         self.settings['image'] = suffixed
 560
 561     def cleanup_system(self):
 562         # Clean up after any errors.
 563
 564         self.message('Cleaning up')
 565
 566         # Umount in the reverse mount order
 567         if self.settings['image']:
 568             for i in xrange(len(self.mount_points) - 1, -1, -1):
 569                 mount_point = self.mount_points[i]
 570                 try:
 571                     self.runcmd(['umount', mount_point], ignore_fail=False)
 572                 except cliapp.AppException:
 573                     logging.debug("umount failed, sleeping and trying again")
 574                     time.sleep(5)
 575                     self.runcmd(['umount', mount_point], ignore_fail=False)
 576
 577             self.runcmd(['kpartx', '-d', self.settings['image']], ignore_fail=True)
 578
 579         for dirname in self.remove_dirs:
 580             shutil.rmtree(dirname)
 581
 582     def customize(self, rootdir):
 583         script = self.settings['customize']
 584         if not script:
 585             return
 586         if not os.path.exists(script):
 587             example = os.path.join("/usr/share/vmdebootstrap/examples/", script)
 588             if not os.path.exists(example):
 589                 self.message("Unable to find %s" % script)
 590                 return
 591             script = example
 592         self.message('Running customize script %s' % script)
 593         with open('/dev/tty', 'w') as tty:
 594             cliapp.runcmd([script, rootdir], stdout=tty, stderr=tty)
 595
 596     def create_tarball(self, rootdir):
 597         # Create a tarball of the disk's contents
 598         # shell out to runcmd since it more easily handles rootdir
 599         self.message('Creating tarball of disk contents')
 600         self.runcmd(['tar', '-cf', self.settings['tarball'], '-C', rootdir, '.'])
 601
 602     def chown(self, rootdir):
 603         # Change image owner after completed build
 604         self.message("Changing owner to %s" % self.settings["owner"])
 605         subprocess.call(["chown",
 606                          self.settings["owner"],
 607                          self.settings["image"]])
 608
 609     def configure_apt(self, rootdir):
 610         # use the distribution and mirror to create an apt source
 611         self.message("Configuring apt to use distribution and mirror")
 612         conf = os.path.join(rootdir, 'etc', 'apt', 'sources.list.d', 'base.list')
 613         logging.debug('configure apt %s' % conf)
 614         f = open(conf, 'w')
 615         f.write('''
 616 deb %(mirror)s %(distribution)s main
 617 #deb-src %(mirror)s %(distribution)s main
 618 ''' % {
 619             'mirror': self.settings['mirror'],
 620             'distribution': self.settings['distribution']
 621         })
 622         f.close()
 623
 624 if __name__ == '__main__':
 625     VmDebootstrap(version=__version__).run()