Remote Encrypted File Synchronization, oDisk
oDisk is a file synchronization application. The need for oDisk came from the discontinuation of Apple's iDisk. oDisk provides a means to backup to a remote host. oDisk encrypts and compresses backups to save space and provide a layer of security not found in iDisk or other backup schemes. Backups are stored as individual files to provide finer granularity in recover if everything else falls apart.
oDisk is also a demonstration of the Opee gem which utilizes an alternative approach to dealing with multiple threads.
GitHub repo: github.com/ohler55/odisk
RubyGems repo: rubygems.org/gems/odisk
<a name=“links”>Links of Interest</a>
Object-based Parallel Evaluation Environment the gem oDisk is built on.
<a name=“release”>Release Notes</a>
Added support for the Opee/OTerm Inspector
Fixed race condition on shutdown bug
Updated to work properly with Ubuntu 12.
Note: the version has been bumped up to 0.9 indicating it is stable enough to use. I have been using it for several months without a problem on 3 Macs and now one Ubuntu machine.
Plans and Notes
So far the basic backup functionality works with backups encrypted and compressed on a remote server. Adding new files and making modifications works just fine. Removing files has not been fully implemented yet and changing ownership or mode only take effect if the file is touched as well. Feel free to give it a try and let me know when you run into bugs.
Support ignore of file and directories
specify on command line and create .odisk/ignore file
use ::File.fnmatch(pattern, path, ::File::FNM_DOTMATCH)
pass array of ignores to digest creation
loosen up current restriction on any file that begins with .
Handle changes in mode, owner, and group
Compare to previous digest to detect changes
File modification times are not changed by mode, owner, or group changes
Note conflicts if modifications are more recent than remote
Use a script to pick change or keep local version
Add progress tracker
Have component pass info to progress actor which will update progress
Planner sends info on all changes along with sizes and comp/crypt flags to progress actor
come up with algoritm for estimating time based on size and flags
comp, crypt, and transfer send status to progress actor
Optional terminal display
Support background application with web front end (much later)
Installation requires Ruby 1.9.3. After that, install the odisk gem.
gem install odisk
The net-ssh and net-sftp gems are also needed as are the oj and opee gems.
gem install net-ssh gem install net-sftp gem install oj gem install opee
oDisk is now ready to use. ssh and sftp must be running on the remote site and credentials must be installed so that the user is not prompted for a password when using ssh or sftp.
After a directory has been selected for backing up odisk can be run to copy the directory to a remote server. For purposes of this description the directory to be backed up is ~/backup.
A passphrase file will also be needed for encryption. The recommended location is in a ~/.odisk directory. The contents of the file will be the passphrase for gpg.
Make sure you have a remote server that has an sftp and ssh daemon running. Your credentials must be set in the authorized_keys file. If you can login without a password it is set up correctly.
The first time odisk is used to backup a directory information about the remote server must be provided. After the first time that information is not needed again. Alternatively a ~/.odisk/remotes file can be set up before running odisk.
To backup to my_server.remote.com for user me to the backup directory on the remote server with a passphrase file of ~/.odisk/backup.pass the following command should be executed.
odisk -r me@my_server.remote.com:~/.odisk/backup.pass ~/backup
A file named ~/backup/.odisk/remote will be created with the connection information for future invocations so that the next time a backup is made on the ~/backup directory the command only needs to be:
Copyright (c) 2012, Peter Ohler All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of Peter Ohler nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.