diff options
Diffstat (limited to 'rawdisk.write')
-rwxr-xr-x | rawdisk.write | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/rawdisk.write b/rawdisk.write new file mode 100755 index 0000000..a43a9cc --- /dev/null +++ b/rawdisk.write @@ -0,0 +1,95 @@ +#!/usr/bin/python +# Copyright (C) 2012-2013 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. + + +'''A Morph deployment write extension for raw disk images.''' + + +import cliapp +import os +import sys +import time +import tempfile + +import morphlib.writeexts + + +class RawDiskWriteExtension(morphlib.writeexts.WriteExtension): + + '''Create a raw disk image during Morph's deployment. + + If the image already exists, it is upgraded. + + The location command line argument is the pathname of the disk image + to be created/upgraded. + + ''' + + def process_args(self, args): + if len(args) != 2: + raise cliapp.AppException('Wrong number of command line args') + + temp_root, location = args + if os.path.isfile(location): + self.upgrade_local_system(location, temp_root) + else: + self.create_local_system(temp_root, location) + self.status(msg='Disk image has been created at %s' % location) + + def upgrade_local_system(self, raw_disk, temp_root): + mp = self.mount(raw_disk) + + version_label = self.get_version_label(mp) + self.status(msg='Updating image to a new version with label %s' % + version_label) + + version_root = os.path.join(mp, 'systems', version_label) + os.mkdir(version_root) + + old_orig = os.path.join(mp, 'systems', 'factory', 'orig') + new_orig = os.path.join(version_root, 'orig') + cliapp.runcmd( + ['btrfs', 'subvolume', 'snapshot', old_orig, new_orig]) + + cliapp.runcmd( + ['rsync', '-a', '--checksum', '--numeric-ids', '--delete', + temp_root + os.path.sep, new_orig]) + + self.create_run(version_root) + + if self.bootloader_is_wanted(): + self.install_kernel(version_root, temp_root) + self.install_extlinux(mp, version_label) + + self.unmount(mp) + + def get_version_label(self, mp): + version_label = os.environ.get('VERSION_LABEL') + + if version_label is None: + self.unmount(mp) + raise cliapp.AppException('VERSION_LABEL was not given') + + if os.path.exists(os.path.join(mp, 'systems', version_label)): + self.unmount(mp) + raise cliapp.AppException('VERSION_LABEL %s already exists' + % version_label) + + return version_label + + +RawDiskWriteExtension().run() + |