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author | Tiago Gomes <tiago.gomes@codethink.co.uk> | 2013-05-20 11:20:28 +0000 |
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committer | Tiago Gomes <tiago.gomes@codethink.co.uk> | 2013-05-23 14:54:25 +0000 |
commit | 1706b1074fbf01d1cd2bbd13bbb58eb5c28f4718 (patch) | |
tree | dc12b211b5173c4a55389faefecbb1cf3ff3fce4 /rawdisk.write | |
parent | bfcf3a24c78de00293c3ca59dabf8d3c31711fd8 (diff) | |
download | definitions-1706b1074fbf01d1cd2bbd13bbb58eb5c28f4718.tar.gz |
Implement raw disk upgrades.
We perform this by cloning an existing orig directory and then updating the
contents using rsync
Diffstat (limited to 'rawdisk.write')
-rwxr-xr-x | rawdisk.write | 54 |
1 files changed, 50 insertions, 4 deletions
diff --git a/rawdisk.write b/rawdisk.write index a55473f2..76438a5e 100755 --- a/rawdisk.write +++ b/rawdisk.write @@ -18,6 +18,7 @@ '''A Morph deployment write extension for raw disk images.''' +import cliapp import os import sys import time @@ -30,8 +31,10 @@ 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. + to be created/upgraded. ''' @@ -40,9 +43,52 @@ class RawDiskWriteExtension(morphlib.writeexts.WriteExtension): raise cliapp.AppException('Wrong number of command line args') temp_root, location = args - - self.create_local_system(temp_root, location) - self.status(msg='Disk image has been created at %s' % location) + 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', 'version1', '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() |