vmdebootstrap

   1 #!/usr/bin/python
   2 # Copyright 2011-2013  Lars Wirzenius
   3 # Copyright 2012  Codethink Limited
   4 # Copyright 2014 Neil Williams <codehelp@debian.org>
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 import cliapp
  20 import crypt
  21 import logging
  22 import os
  23 import re
  24 import shutil
  25 import subprocess
  26 import tempfile
  27 import time
  28
  29
  30 __version__ = '0.4'
  31
  32
  33 class VmDebootstrap(cliapp.Application):
  34
  35     def add_settings(self):
  36         default_arch = subprocess.check_output(
  37             ["dpkg", "--print-architecture"]).strip()
  38
  39         self.settings.boolean(['verbose'], 'report what is going on')
  40         self.settings.string(['image'], 'put created disk image in FILE',
  41                              metavar='FILE')
  42         self.settings.bytesize(['size'],
  43                                'create a disk image of size SIZE (%default)',
  44                                metavar='SIZE',
  45                                default='1G')
  46         self.settings.bytesize(['bootsize'],
  47                                'create boot partition of size SIZE (%default)',
  48                                metavar='BOOTSIZE',
  49                                default='0%')
  50         self.settings.string(['boottype'],
  51                              'specify file system type for /boot/',
  52                              default='ext2')
  53         self.settings.string(['foreign'],
  54                              'set up foreign debootstrap environment using provided program (ie binfmt handler)')
  55         self.settings.string(['variant'],
  56                              'select debootstrap variant it not using the default')
  57         self.settings.boolean(['extlinux'], 'install extlinux?', default=True)
  58         self.settings.string(['tarball'], "tar up the disk's contents in FILE",
  59                              metavar='FILE')
  60         self.settings.string(['mirror'],
  61                              'use MIRROR as package source (%default)',
  62                              metavar='URL',
  63                              default='http://http.debian.net/debian/')
  64         self.settings.string(['arch'], 'architecture to use (%default)',
  65                              metavar='ARCH',
  66                              default=default_arch)
  67         self.settings.string(['distribution'],
  68                              'release to use (%default)',
  69                              metavar='NAME',
  70                              default='stable')
  71         self.settings.string_list(['package'], 'install PACKAGE onto system')
  72         self.settings.string_list(['custom-package'],
  73                                   'install package in DEB file onto system '
  74                                   '(not from mirror)',
  75                                   metavar='DEB')
  76         self.settings.boolean(['no-kernel'], 'do not install a linux package')
  77         self.settings.boolean(['enable-dhcp'], 'enable DHCP on eth0')
  78         self.settings.string(['root-password'], 'set root password',
  79                              metavar='PASSWORD')
  80         self.settings.boolean(['lock-root-password'],
  81                               'lock root account so they cannot login?')
  82         self.settings.string(['customize'],
  83                              'run SCRIPT after setting up system',
  84                              metavar='SCRIPT')
  85         self.settings.string(['hostname'],
  86                              'set name to HOSTNAME (%default)',
  87                              metavar='HOSTNAME',
  88                              default='debian')
  89         self.settings.string_list(['user'],
  90                                   'create USER with PASSWORD',
  91                                   metavar='USER/PASSWORD')
  92         self.settings.boolean(['serial-console'],
  93                               'configure image to use a serial console')
  94         self.settings.string(['serial-console-command'],
  95                              'command to manage the serial console, appended '
  96                              'to /etc/inittab (%default)',
  97                              metavar='COMMAND',
  98                              default='/sbin/getty -L ttyS0 115200 vt100')
  99         self.settings.boolean(['sudo'],
 100                               'install sudo, and if user is created, add them '
 101                               'to sudo group')
 102         self.settings.string(['owner'],
 103                              'the user who will own the image when the build '
 104                              'is complete.')
 105         self.settings.boolean(['squash'],
 106                               'use squashfs on the final image.')
 107         self.settings.boolean(['configure-apt'],
 108                               'Create an apt source based on the distribution '
 109                               'and mirror selected.')
 110         self.settings.boolean(['mbr'],
 111                               'Run install-mbr (no longer done by default)')
 112         self.settings.boolean(['grub'],
 113                               'Install and configure grub2 - disables '
 114                               'extlinux.')
 115         self.settings.boolean(['sparse'],
 116                 'Dont fill the image with zeros to keep a sparse disk image',
 117                 default=False)
 118
 119     def process_args(self, args):
 120         if not self.settings['image'] and not self.settings['tarball']:
 121             raise cliapp.AppException('You must give disk image filename, '
 122                                       'or tarball filename')
 123         if self.settings['image'] and not self.settings['size']:
 124             raise cliapp.AppException('If disk image is specified, '
 125                                       'You must give image size.')
 126
 127         self.remove_dirs = []
 128         self.mount_points = []
 129
 130         try:
 131             rootdev = None
 132             roottype = 'ext4'
 133             bootdev = None
 134             boottype = None
 135             rootdir = None
 136             if self.settings['image']:
 137                 self.create_empty_image()
 138                 self.partition_image()
 139                 if self.settings['mbr']:
 140                     self.install_mbr()
 141                 (rootdev, bootdev) = self.setup_kpartx()
 142                 self.mkfs(rootdev, type=roottype)
 143                 rootdir = self.mount(rootdev)
 144                 if bootdev:
 145                     if self.settings['boottype']:
 146                         boottype = self.settings['boottype']
 147                     else:
 148                         boottype = 'ext2'
 149                     self.mkfs(bootdev, type=boottype)
 150                     bootdir = '%s/%s' % (rootdir, 'boot/')
 151                     os.mkdir(bootdir)
 152                     bootdir = self.mount(bootdev, bootdir)
 153             else:
 154                 rootdir = self.mkdtemp()
 155             self.debootstrap(rootdir)
 156             self.set_hostname(rootdir)
 157             self.create_fstab(rootdir, rootdev, roottype, bootdev, boottype)
 158             self.install_debs(rootdir)
 159             self.cleanup_apt_cache(rootdir)
 160             self.set_root_password(rootdir)
 161             self.create_users(rootdir)
 162             self.remove_udev_persistent_rules(rootdir)
 163             self.setup_networking(rootdir)
 164             if self.settings['configure-apt']:
 165                 self.configure_apt(rootdir)
 166             self.customize(rootdir)
 167             self.update_initramfs(rootdir)
 168
 169             if self.settings['image']:
 170                 if self.settings['grub']:
 171                     self.install_grub2(rootdev, rootdir)
 172                 elif self.settings['extlinux']:
 173                     self.install_extlinux(rootdev, rootdir)
 174                 self.append_serial_console(rootdir)
 175                 self.optimize_image(rootdir)
 176                 if self.settings['squash']:
 177                     self.squash()
 178
 179             if self.settings['foreign']:
 180                 os.unlink('%s/usr/bin/%s' %
 181                           (rootdir, os.path.basename(self.settings['foreign'])))
 182
 183             if self.settings['tarball']:
 184                 self.create_tarball(rootdir)
 185
 186             if self.settings['owner']:
 187                 self.chown(rootdir)
 188         except BaseException, e:
 189             self.message('EEEK! Something bad happened...')
 190             if rootdir:
 191                 db_log = os.path.join(rootdir, 'debootstrap', 'debootstrap.log')
 192                 if os.path.exists(db_log):
 193                     shutil.copy(db_log, os.getcwd())
 194             self.message(e)
 195             self.cleanup_system()
 196             raise
 197         else:
 198             self.cleanup_system()
 199
 200     def message(self, msg):
 201         logging.info(msg)
 202         if self.settings['verbose']:
 203             print msg
 204
 205     def runcmd(self, argv, stdin='', ignore_fail=False, env=None, **kwargs):
 206         logging.debug('runcmd: %s %s %s' % (argv, env, kwargs))
 207         p = subprocess.Popen(argv, stdin=subprocess.PIPE,
 208                              stdout=subprocess.PIPE, stderr=subprocess.PIPE,
 209                              env=env, **kwargs)
 210         out, err = p.communicate(stdin)
 211         if p.returncode != 0:
 212             msg = 'command failed: %s\n%s\n%s' % (argv, out, err)
 213             logging.error(msg)
 214             if not ignore_fail:
 215                 raise cliapp.AppException(msg)
 216         return out
 217
 218     def mkdtemp(self):
 219         dirname = tempfile.mkdtemp()
 220         self.remove_dirs.append(dirname)
 221         logging.debug('mkdir %s' % dirname)
 222         return dirname
 223
 224     def mount(self, device, path=None):
 225         if not path:
 226             mount_point = self.mkdtemp()
 227         else:
 228             mount_point = path
 229         self.message('Mounting %s on %s' % (device, mount_point))
 230         self.runcmd(['mount', device, mount_point])
 231         self.mount_points.append(mount_point)
 232         logging.debug('mounted %s on %s' % (device, mount_point))
 233         return mount_point
 234
 235     def create_empty_image(self):
 236         self.message('Creating disk image')
 237         self.runcmd(['qemu-img', 'create', '-f', 'raw',
 238                      self.settings['image'],
 239                      str(self.settings['size'])])
 240
 241     def partition_image(self):
 242         self.message('Creating partitions')
 243         self.runcmd(['parted', '-s', self.settings['image'],
 244                      'mklabel', 'msdos'])
 245         if self.settings['bootsize'] and self.settings['bootsize'] is not '0%':
 246             bootsize = str(self.settings['bootsize'] / (1024 * 1024))
 247             self.runcmd(['parted', '-s', self.settings['image'],
 248                          'mkpart', 'primary', 'fat16', '0', bootsize])
 249         else:
 250             bootsize = '0%'
 251         self.runcmd(['parted', '-s', self.settings['image'],
 252                      'mkpart', 'primary', bootsize, '100%'])
 253         self.runcmd(['parted', '-s', self.settings['image'],
 254                      'set', '1', 'boot', 'on'])
 255
 256     def update_initramfs(self, rootdir):
 257         cmd = os.path.join('usr', 'sbin', 'update-initramfs')
 258         if os.path.exists(os.path.join(rootdir, cmd)):
 259             self.message("Updating the initramfs")
 260             self.runcmd(['chroot', rootdir, cmd, '-u'])
 261
 262     def install_mbr(self):
 263         if os.path.exists("/sbin/install-mbr"):
 264             self.message('Installing MBR')
 265             self.runcmd(['install-mbr', self.settings['image']])
 266
 267     def setup_kpartx(self):
 268         out = self.runcmd(['kpartx', '-avs', self.settings['image']])
 269         if self.settings['bootsize']:
 270             bootindex = 0
 271             rootindex = 1
 272             parts = 2
 273         else:
 274             rootindex = 0
 275             parts = 1
 276             boot = None
 277         devices = [line.split()[2]
 278                    for line in out.splitlines()
 279                    if line.startswith('add map ')]
 280         if len(devices) != parts:
 281             raise cliapp.AppException('Surprising number of partitions')
 282         root = '/dev/mapper/%s' % devices[rootindex]
 283         if self.settings['bootsize']:
 284             boot = '/dev/mapper/%s' % devices[bootindex]
 285         return (root, boot)
 286
 287     def mkfs(self, device, type):
 288         self.message('Creating filesystem %s' % type)
 289         self.runcmd(['mkfs', '-t', type, device])
 290
 291     def debootstrap(self, rootdir):
 292         self.message('Debootstrapping')
 293
 294         if self.settings['foreign']:
 295             necessary_packages = []
 296         else:
 297             necessary_packages = ['acpid']
 298
 299         if self.settings['grub']:
 300             necessary_packages.append('grub2')
 301
 302         include = self.settings['package']
 303
 304         if not self.settings['no-kernel']:
 305             if self.settings['arch'] == 'i386':
 306                 kernel_arch = '486'
 307             else:
 308                 kernel_arch = self.settings['arch']
 309             kernel_image = 'linux-image-%s' % kernel_arch
 310             include.append(kernel_image)
 311
 312         if self.settings['sudo'] and 'sudo' not in include:
 313             include.append('sudo')
 314
 315         args = ['debootstrap', '--arch=%s' % self.settings['arch']]
 316         if self.settings['package'] and len(necessary_packages) > 0:
 317             args.append(
 318                 '--include=%s' % ','.join(necessary_packages + include))
 319         if self.settings['foreign']:
 320             args.append('--foreign')
 321         if self.settings['variant']:
 322             args.append('--variant')
 323             args.append(self.settings['variant'])
 324         args += [self.settings['distribution'],
 325                  rootdir, self.settings['mirror']]
 326         logging.debug(" ".join(args))
 327         self.runcmd(args)
 328         if self.settings['foreign']:
 329             # set a noninteractive debconf environment for secondstage
 330             env = {
 331                 "DEBIAN_FRONTEND": "noninteractive",
 332                 "DEBCONF_NONINTERACTIVE_SEEN": "true",
 333                 "LC_ALL": "C"
 334             }
 335             # add the mapping to the complete environment.
 336             env.update(os.environ)
 337             # First copy the binfmt handler over
 338             self.message('Setting up binfmt handler')
 339             shutil.copy(self.settings['foreign'], '%s/usr/bin/' % rootdir)
 340             # Next, run the package install scripts etc.
 341             self.message('Running debootstrap second stage')
 342             self.runcmd(['chroot', rootdir,
 343                          '/debootstrap/debootstrap', '--second-stage'],
 344                         env=env)
 345
 346     def set_hostname(self, rootdir):
 347         hostname = self.settings['hostname']
 348         with open(os.path.join(rootdir, 'etc', 'hostname'), 'w') as f:
 349             f.write('%s\n' % hostname)
 350
 351         etc_hosts = os.path.join(rootdir, 'etc', 'hosts')
 352         try:
 353             with open(etc_hosts, 'r') as f:
 354                 data = f.read()
 355             with open(etc_hosts, 'w') as f:
 356                 for line in data.splitlines():
 357                     if line.startswith('127.0.0.1'):
 358                         line += ' %s' % hostname
 359                     f.write('%s\n' % line)
 360         except IOError, e:
 361             pass
 362
 363     def create_fstab(self, rootdir, rootdev, roottype, bootdev, boottype):
 364         def fsuuid(device):
 365             out = self.runcmd(['blkid', '-c', '/dev/null', '-o', 'value',
 366                                '-s', 'UUID', device])
 367             return out.splitlines()[0].strip()
 368
 369         if rootdev:
 370             rootdevstr = 'UUID=%s' % fsuuid(rootdev)
 371         else:
 372             rootdevstr = '/dev/sda1'
 373
 374         if bootdev:
 375             bootdevstr = 'UUID=%s' % fsuuid(bootdev)
 376         else:
 377             bootdevstr = None
 378
 379         fstab = os.path.join(rootdir, 'etc', 'fstab')
 380         with open(fstab, 'w') as f:
 381             f.write('proc /proc proc defaults 0 0\n')
 382             f.write('%s / %s errors=remount-ro 0 1\n' % (rootdevstr, roottype))
 383             if bootdevstr:
 384                 f.write('%s /boot %s errors=remount-ro 0 2\n' % (bootdevstr, boottype))
 385
 386     def install_debs(self, rootdir):
 387         if not self.settings['custom-package']:
 388             return
 389         self.message('Installing custom packages')
 390         tmp = os.path.join(rootdir, 'tmp', 'install_debs')
 391         os.mkdir(tmp)
 392         for deb in self.settings['custom-package']:
 393             shutil.copy(deb, tmp)
 394         filenames = [os.path.join('/tmp/install_debs', os.path.basename(deb))
 395                      for deb in self.settings['custom-package']]
 396         out, err, exit = \
 397             self.runcmd_unchecked(['chroot', rootdir, 'dpkg', '-i'] + filenames)
 398         logging.debug('stdout:\n%s' % out)
 399         logging.debug('stderr:\n%s' % err)
 400         out = self.runcmd(['chroot', rootdir,
 401                           'apt-get', '-f', '--no-remove', 'install'])
 402         logging.debug('stdout:\n%s' % out)
 403         shutil.rmtree(tmp)
 404
 405     def cleanup_apt_cache(self, rootdir):
 406         out = self.runcmd(['chroot', rootdir, 'apt-get', 'clean'])
 407         logging.debug('stdout:\n%s' % out)
 408
 409     def set_root_password(self, rootdir):
 410         if self.settings['root-password']:
 411             self.message('Setting root password')
 412             self.set_password(rootdir, 'root', self.settings['root-password'])
 413         elif self.settings['lock-root-password']:
 414             self.message('Locking root password')
 415             self.runcmd(['chroot', rootdir, 'passwd', '-l', 'root'])
 416         else:
 417             self.message('Give root an empty password')
 418             self.delete_password(rootdir, 'root')
 419
 420     def create_users(self, rootdir):
 421         def create_user(user):
 422             self.runcmd(['chroot', rootdir, 'adduser', '--gecos', user,
 423                          '--disabled-password', user])
 424             if self.settings['sudo']:
 425                 self.runcmd(['chroot', rootdir, 'adduser', user, 'sudo'])
 426
 427         for userpass in self.settings['user']:
 428             if '/' in userpass:
 429                 user, password = userpass.split('/', 1)
 430                 create_user(user)
 431                 self.set_password(rootdir, user, password)
 432             else:
 433                 create_user(userpass)
 434                 self.delete_password(rootdir, userpass)
 435
 436     def set_password(self, rootdir, user, password):
 437         encrypted = crypt.crypt(password, '..')
 438         self.runcmd(['chroot', rootdir, 'usermod', '-p', encrypted, user])
 439
 440     def delete_password(self, rootdir, user):
 441         self.runcmd(['chroot', rootdir, 'passwd', '-d', user])
 442
 443     def remove_udev_persistent_rules(self, rootdir):
 444         self.message('Removing udev persistent cd and net rules')
 445         for x in ['70-persistent-cd.rules', '70-persistent-net.rules']:
 446             pathname = os.path.join(rootdir, 'etc', 'udev', 'rules.d', x)
 447             if os.path.exists(pathname):
 448                 logging.debug('rm %s' % pathname)
 449                 os.remove(pathname)
 450             else:
 451                 logging.debug('not removing non-existent %s' % pathname)
 452
 453     def setup_networking(self, rootdir):
 454         self.message('Setting up networking')
 455
 456         f = open(os.path.join(rootdir, 'etc', 'network', 'interfaces'), 'w')
 457         f.write('auto lo\n')
 458         f.write('iface lo inet loopback\n')
 459
 460         if self.settings['enable-dhcp']:
 461             f.write('\n')
 462             f.write('auto eth0\n')
 463             f.write('iface eth0 inet dhcp\n')
 464
 465         f.close()
 466
 467     def append_serial_console(self, rootdir):
 468         if self.settings['serial-console']:
 469             serial_command = self.settings['serial-console-command']
 470             logging.debug('adding getty to serial console')
 471             inittab = os.path.join(rootdir, 'etc/inittab')
 472             with open(inittab, 'a') as f:
 473                 f.write('\nS0:23:respawn:%s\n' % serial_command)
 474
 475     def install_grub2(self, rootdev, rootdir):
 476         self.message("Configuring grub2")
 477         # rely on kpartx using consistent naming to map loop0p1 to loop0
 478         install_dev = os.path.join('/dev', os.path.basename(rootdev)[:-2])
 479         self.runcmd(['mount', '/dev', '-t', 'devfs', '-obind',
 480                     '%s' % os.path.join(rootdir, 'dev')])
 481         self.runcmd(['mount', '/proc', '-t', 'proc', '-obind',
 482                     '%s' % os.path.join(rootdir, 'proc')])
 483         self.runcmd(['mount', '/sys', '-t', 'sysfs', '-obind',
 484                     '%s' % os.path.join(rootdir, 'sys')])
 485         try:
 486             self.runcmd(['chroot', rootdir, 'update-grub'])
 487             self.runcmd(['chroot', rootdir, 'grub-install', install_dev])
 488         except cliapp.AppException as e:
 489             self.message("Failed. Is grub2-common installed? Using extlinux.")
 490         self.runcmd(['umount', os.path.join(rootdir, 'sys')])
 491         self.runcmd(['umount', os.path.join(rootdir, 'proc')])
 492         self.runcmd(['umount', os.path.join(rootdir, 'dev')])
 493         self.install_extlinux(rootdev, rootdir)
 494
 495     def install_extlinux(self, rootdev, rootdir):
 496         if not os.path.exists("/usr/bin/extlinux"):
 497             self.message("extlinux not installed, skipping.")
 498             return
 499         self.message('Installing extlinux')
 500
 501         def find(pattern):
 502             dirname = os.path.join(rootdir, 'boot')
 503             basenames = os.listdir(dirname)
 504             logging.debug('find: %s' % basenames)
 505             for basename in basenames:
 506                 if re.search(pattern, basename):
 507                     return os.path.join('boot', basename)
 508             raise cliapp.AppException('Cannot find match: %s' % pattern)
 509
 510         try:
 511             kernel_image = find('vmlinuz-.*')
 512             initrd_image = find('initrd.img-.*')
 513         except cliapp.AppException as e:
 514             self.message("Unable to find kernel. Not installing extlinux.")
 515             logging.debug("No kernel found. %s. Skipping install of extlinux." % e)
 516             return
 517
 518         out = self.runcmd(['blkid', '-c', '/dev/null', '-o', 'value',
 519                            '-s', 'UUID', rootdev])
 520         uuid = out.splitlines()[0].strip()
 521
 522         conf = os.path.join(rootdir, 'extlinux.conf')
 523         logging.debug('configure extlinux %s' % conf)
 524         f = open(conf, 'w')
 525         f.write('''
 526 default linux
 527 timeout 1
 528
 529 label linux
 530 kernel %(kernel)s
 531 append initrd=%(initrd)s root=UUID=%(uuid)s ro %(kserial)s
 532 %(extserial)s
 533 ''' % {
 534             'kernel': kernel_image,
 535             'initrd': initrd_image,
 536             'uuid': uuid,
 537             'kserial':
 538             'console=ttyS0,115200' if self.settings['serial-console'] else '',
 539             'extserial': 'serial 0 115200' if self.settings['serial-console'] else '',
 540         })
 541         f.close()
 542
 543         self.runcmd(['extlinux', '--install', rootdir])
 544         self.runcmd(['sync'])
 545         time.sleep(2)
 546
 547     def optimize_image(self, rootdir):
 548         """
 549         Filing up the image with zeros will increase its compression rate
 550         """
 551         if not self.settings['sparse']:
 552             zeros = os.path.join(rootdir, 'ZEROS')
 553             self.runcmd_unchecked(['dd', 'if=/dev/zero', 'of=' + zeros, 'bs=1M'])
 554             self.runcmd(['rm', '-f', zeros])
 555
 556     def squash(self):
 557         """
 558         Run squashfs on the image.
 559         """
 560         if not os.path.exists('/usr/bin/mksquashfs'):
 561             logging.warning("Squash selected but mksquashfs not found!")
 562             return
 563         self.message("Running mksquashfs")
 564         suffixed = "%s.squashfs" % self.settings['image']
 565         self.runcmd(['mksquashfs', self.settings['image'],
 566                      suffixed,
 567                      '-no-progress', '-comp', 'xz'], ignore_fail=False)
 568         os.unlink(self.settings['image'])
 569         self.settings['image'] = suffixed
 570
 571     def cleanup_system(self):
 572         # Clean up after any errors.
 573
 574         self.message('Cleaning up')
 575
 576         # Umount in the reverse mount order
 577         if self.settings['image']:
 578             for i in xrange(len(self.mount_points) - 1, -1, -1):
 579                 mount_point = self.mount_points[i]
 580                 try:
 581                     self.runcmd(['umount', mount_point], ignore_fail=False)
 582                 except cliapp.AppException:
 583                     logging.debug("umount failed, sleeping and trying again")
 584                     time.sleep(5)
 585                     self.runcmd(['umount', mount_point], ignore_fail=False)
 586
 587             self.runcmd(['kpartx', '-d', self.settings['image']], ignore_fail=True)
 588
 589         for dirname in self.remove_dirs:
 590             shutil.rmtree(dirname)
 591
 592     def customize(self, rootdir):
 593         script = self.settings['customize']
 594         if not script:
 595             return
 596         if not os.path.exists(script):
 597             example = os.path.join("/usr/share/vmdebootstrap/examples/", script)
 598             if not os.path.exists(example):
 599                 self.message("Unable to find %s" % script)
 600                 return
 601             script = example
 602         self.message('Running customize script %s' % script)
 603         with open('/dev/tty', 'w') as tty:
 604             cliapp.runcmd([script, rootdir], stdout=tty, stderr=tty)
 605
 606     def create_tarball(self, rootdir):
 607         # Create a tarball of the disk's contents
 608         # shell out to runcmd since it more easily handles rootdir
 609         self.message('Creating tarball of disk contents')
 610         self.runcmd(['tar', '-cf', self.settings['tarball'], '-C', rootdir, '.'])
 611
 612     def chown(self, rootdir):
 613         # Change image owner after completed build
 614         self.message("Changing owner to %s" % self.settings["owner"])
 615         subprocess.call(["chown",
 616                          self.settings["owner"],
 617                          self.settings["image"]])
 618
 619     def configure_apt(self, rootdir):
 620         # use the distribution and mirror to create an apt source
 621         self.message("Configuring apt to use distribution and mirror")
 622         conf = os.path.join(rootdir, 'etc', 'apt', 'sources.list.d', 'base.list')
 623         logging.debug('configure apt %s' % conf)
 624         f = open(conf, 'w')
 625         f.write('''
 626 deb %(mirror)s %(distribution)s main
 627 #deb-src %(mirror)s %(distribution)s main
 628 ''' % {
 629             'mirror': self.settings['mirror'],
 630             'distribution': self.settings['distribution']
 631         })
 632         f.close()
 633
 634 if __name__ == '__main__':
 635     VmDebootstrap(version=__version__).run()