plugins/imager/loop_plugin.py

   1 #!/usr/bin/python -tt
   2 #
   3 # Copyright (c) 2011 Intel, Inc.
   4 #
   5 # This program is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License as published by the Free
   7 # Software Foundation; version 2 of the License
   8 #
   9 # This program is distributed in the hope that it will be useful, but
  10 # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11 # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 # for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License along
  15 # with this program; if not, write to the Free Software Foundation, Inc., 59
  16 # Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17
  18 import os
  19 import shutil
  20 import tempfile
  21
  22 from mic import chroot, msger, rt_util
  23 from mic.utils import misc, fs_related, errors
  24 from mic.conf import configmgr
  25 from mic.plugin import pluginmgr
  26 from mic.imager.loop import LoopImageCreator, load_mountpoints
  27
  28 from mic.pluginbase import ImagerPlugin
  29 class LoopPlugin(ImagerPlugin):
  30     name = 'loop'
  31
  32     @classmethod
  33     def do_create(self, args):
  34         """${cmd_name}: create loop image
  35
  36         Usage:
  37             ${name} ${cmd_name} <ksfile> [OPTS]
  38
  39         ${cmd_option_list}
  40         """
  41
  42         if args is None:
  43             raise errors.Usage("Invalid arguments")
  44
  45         creatoropts = configmgr.create
  46         ksconf = args.ksfile
  47
  48         if creatoropts['runtime'] == "bootstrap":
  49             configmgr._ksconf = ksconf
  50             rt_util.bootstrap_mic()
  51
  52         recording_pkgs = []
  53         if len(creatoropts['record_pkgs']) > 0:
  54             recording_pkgs = creatoropts['record_pkgs']
  55
  56         if creatoropts['release'] is not None:
  57             if 'name' not in recording_pkgs:
  58                 recording_pkgs.append('name')
  59             if 'vcs' not in recording_pkgs:
  60                 recording_pkgs.append('vcs')
  61
  62         configmgr._ksconf = ksconf
  63
  64         # try to find the pkgmgr
  65         pkgmgr = None
  66         backends = pluginmgr.get_plugins('backend')
  67         if 'auto' == creatoropts['pkgmgr']:
  68             for key in configmgr.prefer_backends:
  69                 if key in backends:
  70                     pkgmgr = backends[key]
  71                     break
  72         else:
  73             for key in backends.keys():
  74                 if key == creatoropts['pkgmgr']:
  75                     pkgmgr = backends[key]
  76                     break
  77
  78         if not pkgmgr:
  79             raise errors.CreatorError("Can't find backend: %s, "
  80                                       "available choices: %s" %
  81                                       (creatoropts['pkgmgr'],
  82                                        ','.join(backends.keys())))
  83
  84         creator = LoopImageCreator(creatoropts,
  85                                    pkgmgr,
  86                                    args.compress_image,
  87                                    args.shrink)
  88
  89         if len(recording_pkgs) > 0:
  90             creator._recording_pkgs = recording_pkgs
  91
  92         image_names = [creator.name + ".img"]
  93         image_names.extend(creator.get_image_names())
  94         self.check_image_exists(creator.destdir,
  95                                 creator.pack_to,
  96                                 image_names,
  97                                 creatoropts['release'])
  98
  99         try:
 100             creator.check_depend_tools()
 101             creator.mount(None, creatoropts["cachedir"])
 102             creator.install()
 103             creator.configure(creatoropts["repomd"])
 104             creator.copy_kernel()
 105             creator.unmount()
 106             creator.package(creatoropts["destdir"])
 107             creator.create_manifest()
 108
 109             if creatoropts['release'] is not None:
 110                 creator.release_output(ksconf,
 111                                        creatoropts['destdir'],
 112                                        creatoropts['release'])
 113             creator.print_outimage_info()
 114
 115         except errors.CreatorError:
 116             raise
 117         finally:
 118             creator.cleanup()
 119
 120         msger.info("Finished.")
 121         return 0
 122
 123     @classmethod
 124     def _do_chroot_tar(cls, target, cmd=[]):
 125         mountfp_xml = os.path.splitext(target)[0] + '.xml'
 126         if not os.path.exists(mountfp_xml):
 127             raise errors.CreatorError("No mount point file found for this tar "
 128                                       "image, please check %s" % mountfp_xml)
 129
 130         import tarfile
 131         tar = tarfile.open(target, 'r')
 132         tmpdir = misc.mkdtemp()
 133         tar.extractall(path=tmpdir)
 134         tar.close()
 135
 136         mntdir = misc.mkdtemp()
 137
 138         loops = []
 139         for (mp, label, name, size, fstype) in load_mountpoints(mountfp_xml):
 140             if fstype in ("ext2", "ext3", "ext4"):
 141                 myDiskMount = fs_related.ExtDiskMount
 142             elif fstype == "btrfs":
 143                 myDiskMount = fs_related.BtrfsDiskMount
 144             elif fstype in ("vfat", "msdos"):
 145                 myDiskMount = fs_related.VfatDiskMount
 146             else:
 147                 raise errors.CreatorError("Cannot support fstype: %s" % fstype)
 148
 149             name = os.path.join(tmpdir, name)
 150             size = size * 1024L * 1024L
 151             loop = myDiskMount(fs_related.SparseLoopbackDisk(name, size),
 152                                os.path.join(mntdir, mp.lstrip('/')),
 153                                fstype, size, label)
 154
 155             try:
 156                 msger.verbose("Mount %s to %s" % (mp, mntdir + mp))
 157                 fs_related.makedirs(os.path.join(mntdir, mp.lstrip('/')))
 158                 loop.mount()
 159
 160             except:
 161                 loop.cleanup()
 162                 for lp in reversed(loops):
 163                     chroot.cleanup_after_chroot("img", lp, None, mntdir)
 164
 165                 shutil.rmtree(tmpdir, ignore_errors=True)
 166                 raise
 167
 168             loops.append(loop)
 169
 170         try:
 171             if len(cmd) != 0:
 172                 cmdline = "/usr/bin/env HOME=/root " + ' '.join(cmd)
 173             else:
 174                 cmdline = "/usr/bin/env HOME=/root /bin/bash"
 175             chroot.chroot(mntdir, None, cmdline)
 176         except:
 177             raise errors.CreatorError("Failed to chroot to %s." % target)
 178         finally:
 179             for loop in reversed(loops):
 180                 chroot.cleanup_after_chroot("img", loop, None, mntdir)
 181
 182             shutil.rmtree(tmpdir, ignore_errors=True)
 183
 184     @classmethod
 185     def do_chroot(cls, target, cmd=[]):
 186         if target.endswith('.tar'):
 187             import tarfile
 188             if tarfile.is_tarfile(target):
 189                 LoopPlugin._do_chroot_tar(target, cmd)
 190                 return
 191             else:
 192                 raise errors.CreatorError("damaged tarball for loop images")
 193
 194         img = target
 195         imgsize = misc.get_file_size(img) * 1024L * 1024L
 196         imgtype = misc.get_image_type(img)
 197         if imgtype == "btrfsimg":
 198             fstype = "btrfs"
 199             myDiskMount = fs_related.BtrfsDiskMount
 200         elif imgtype in ("ext3fsimg", "ext4fsimg"):
 201             fstype = imgtype[:4]
 202             myDiskMount = fs_related.ExtDiskMount
 203         else:
 204             raise errors.CreatorError("Unsupported filesystem type: %s" \
 205                                       % imgtype)
 206
 207         extmnt = misc.mkdtemp()
 208         extloop = myDiskMount(fs_related.SparseLoopbackDisk(img, imgsize),
 209                                                          extmnt,
 210                                                          fstype,
 211                                                          4096,
 212                                                          "%s label" % fstype)
 213         try:
 214             extloop.mount()
 215
 216         except errors.MountError:
 217             extloop.cleanup()
 218             shutil.rmtree(extmnt, ignore_errors=True)
 219             raise
 220
 221         try:
 222             if cmd is not None:
 223                 cmdline = cmd
 224             else:
 225                 cmdline = "/bin/bash"
 226             envcmd = fs_related.find_binary_inchroot("env", extmnt)
 227             if envcmd:
 228                 cmdline = "%s HOME=/root %s" % (envcmd, cmdline)
 229             chroot.chroot(extmnt, None, cmdline)
 230         except:
 231             raise errors.CreatorError("Failed to chroot to %s." % img)
 232         finally:
 233             chroot.cleanup_after_chroot("img", extloop, None, extmnt)
 234
 235     @classmethod
 236     def do_unpack(cls, srcimg):
 237         image = os.path.join(tempfile.mkdtemp(dir="/var/tmp", prefix="tmp"),
 238                              "target.img")
 239         msger.info("Copying file system ...")
 240         shutil.copyfile(srcimg, image)
 241         return image