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a distributed FUSE filesystem with offline operations support
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Important note: while what is in this README is still relevant for the code in this project, I have stopped developing the python version of sharebox. Due to performance issues, I have switched to a C version, which makes copying big files one order of magnitude faster. See https://github.com/chmduquesne/sharebox-fs ---- Sharebox is a distributed FUSE filesystem for sharing files across several machines. - [ok] It supports disconnected operations: you can go offline and modify a file and the modifications will be propagated when you'll be back. - [not implemented - see the branch mergetool] If several hosts modify the same file, an interactive conflict handler is spawned on the hosts (but only one host needs to resolve the conflict). - [ok] Of course, built-in automatic versioning is provided - [not implemented] with a configurable number of versions. - [ok] It is also space-efficient: files appear as present on the system but are actually downloaded from peers on demand. - [not implemented] You can also control where your data lives with a set of commands. Features: - fully distributed - offline operations - copy on write - builtin versioning - interactive conflicts handling An important detail: sharebox is nothing more than a very simple filesystem layer around the wonderful git-annex, which actually does all the work. You can thank its creator for being a genius. == Walkthrough == 1) We create an empty directory where to actually put the files. Sharebox will manage this directory for us. mkdir -p test/local/git 2) We create a directory that will be sharebox's mountpoint. mkdir -p test/local/mnt 3) We mount test/local/git into test/local/mnt. ./sharebox.py test/local/mnt -o gitdir=test/local/git 4) Now let's set up a mirror. We go with the usual commands. mkdir -p test/remote/git mkdir -p test/remote/mnt ./sharebox.py test/remote/mnt -o gitdir=test/remote/git 5) We still need to set the git directories as remotes. cd test/remote/git git remote add local ../../local/git cd ../../local/git git remote add remote ../../remote/git cd ../../.. 6) It is now time for testing! Let us create a file. echo test > test/local/mnt/foo 7) There is nothing on the remote. ls test/remote/mnt 8) We will now tell the remote filesystem to synchronize. (This typically goes in a crontab.) ./sharebox.py --command sync test/remote/mnt 8) The remote now appears to have the file foo. However, it is not really here (it would if we had mounted it with the option "-o getall"). We can see a file named foo, but its size appears to be 0. ls -l test/remote/mnt total 0 -rw-r--r-- 1 user user 0 2011-03-31 18:16 foo 9) Though if we try to access to foo, it is downloaded on the fly: touch test/remote/mnt/foo cat test/remote/mnt/foo test 10) We are done. We can unmount the two directories. fusermount -u test/local/mnt fusermount -u test/remote/mnt == State of the project == Sharebox is at a very early stage. Even the author still does not use it as a working solution. There are features that are not implemented, and there are features that haven't even been decided. What is not implemented: - As usual, there is no documentation and very few unit tests - Conflicts are not handled yet - The number of copies kept for the same file is not setable yet, but it should become a mount option. - There is no way to drop unnecessary copies, nor to get deleted files == Debugging == To debug, mount with the foreground option: sharebox.py test/local/mnt -o gitdir=test/local/git -o foreground