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Development

Reopening iFolder

April 29, 2009

This article was contributed by Nathan Willis

Novell created the file sharing and synchronization tool iFolder years before it began the acquisitions that transformed the company into a major open source vendor. After it entered the Linux market, Novell placed the iFolder code under the GPL, but by 2007 the project was receiving little attention. Commercial packages continued to be available as part of Novell's Kablink groupware product, but source code releases languished. That made it a surprise when Novell resurrected iFolder in April of this year, posting new client and server packages for Linux, and clients for Windows and Mac OS X.

iFolder allows you to connect a local folder on your computer to a remote synchronization server. Every few seconds, the iFolder program on your computer detects whether any of the files have changed, and, if they have, uploads the updated files in the background. You can continue to work offline (such as while traveling), and iFolder will re-sync with the server the next time you reconnect. Plus, businesses and workgroups can use iFolder to share the same folder with multiple users, creating an automatically synchronized shared work space that is also backed up with remote storage.

The Comeback Kid

Although the continued availability of the source code is an oft-cited advantage to free software, it is still rare to for a dormant project to suddenly return to life — even more so when it is a commercially-sponsored project and the economy is down. Novell's iFolder project leader Brent McConnell said that a lot of voices inside the company pushed for the project to be revived, both because they believe it is valuable to the open source community and because it is a viable product for enterprise customers. "We think that it's a superior tool," he said, adding, "We also want to move it forward as an open project and see where the community takes it."

One of the voices inside Novell championing iFolder's cause belonged to OpenSUSE community manager Joe "Zonker" Brockmeier. In addition to believing in the value of the technology itself, Brockmeier said that he and others in the open source community at Novell felt it was very important that the company devote resources to an open source iFolder effort because not doing so would mean going back on the commitment made when the project was opened up.

McConnell echoed that sentiment, noting that Novell took criticism for not releasing iFolder source code as quickly as many would have liked, and admitting that such criticism was probably justly due. However, he added, Novell has committed resources to managing iFolder just as it has to other community open source projects like OpenSUSE. "I hope that the community sees this as a strong signal that we're committed to the project and building community around iFolder."

The basics

iFolder uses a client-server model to replicate a shared folder over the network. The replication can be between a single client and the server, thus serving as a remote backup, or it can share the same folder between multiple clients, enabling multi-user collaboration. In both cases, the system automatically tracks changes to the folder's contents and transparently synchronizes them, resolving conflicting change sets from different clients on the server side. In addition, unlike network-mounted storage, iFolder's client-side contents are locally stored in the client's filesystem, so editing, new file creation, and file deletion continue to function in disconnected mode.

The iFolder server runs on top of Apache, and can optionally use SSL encryption for client-server transfers. User accounts are managed through the server, with support for access control lists on each iFolder's contents, storage quotas per account, and integration of user accounts with an LDAP server.

The client side code is a small Mono application that handles authentication to the server, computes hashes of shared files to detect changes, and transfers changed files between the client and the server. The actual client-side files are local, and both their location in the filesystem and the underlying disk filesystem used are immaterial. Users can also connect to the server via a web interface and access the server's copy of their files without using the iFolder client.

April's release of iFolder is designated version 3.7.2. The server package is available for OpenSUSE 10.3 and SUSE Linux Enterprise Server (SLES) 10 in 32-bit and 64-bit editions for both. It requires Apache 2, OpenSSL, and Mono 1.2.6. The client package is also available for OpenSUSE 10.3 and SLES 10 in 32 and 64-bits, as well as for Windows XP, 32-bit and 64-bit Windows Vista, Mac OS X 10.4.11 and Mac OS X 10.5. The Windows builds work with Microsoft's .NET, while the Linux and Mac builds require Novell's Mono version 1.2.6.

iFolder compared to other systems

iFolder is not the only distributed or collaborative storage solution available for Linux, of course, but several features distinguish it from alternative lower-level systems and commercial products.

Basic network file systems like Samba and NFS are designed to work over a LAN. WebDAV, on the other hand, is based on HTTP, can be secured with SSL encryption, and allows for multiple users to connect to the same set of files. But unlike iFolder, WebDAV maintains only one copy of the shared folder and files — the original on the server. That prevents clients from continuing to work while disconnected from the server or the network as a whole.

There are distributed filesystems designed to operate in disconnected mode and with free software Linux implementations, notably the Coda project from Carnegie Mellon University. Coda is a complete filesystem rather than an add-on utility, however, and requires kernel-level support on the client machine. The Linux kernel has supported Coda for years, and it is supported by FreeBSD and NetBSD, but not by Windows or Mac OS X. Furthermore, Coda's disconnected mode operates by maintaining a temporary local cache on the client; when connected to the server, the server's copy of the file is used, just as in NFS, WebDAV, or other networked file systems.

Brockmeier said that he regards Dropbox as the only real comparable product on the market. Dropbox is a commercial service that provides shared online storage (with tiered free and paid accounts), but although its client-side program for GNOME's Nautilus file manager is open source, the server is proprietary.

The future

The current 3.7.2 release of iFolder is a welcome sight after more than a year without an update. But the Linux binaries are only available for SUSE, and the supported version — 10.3 — is no longer current. The Mono dependency is also old; iFolder 3.7.2 requires Mono 1.2.6, which was released in 2007.

Novell has set up project hosting at SourceForge.net, including user forums and wiki documentation, but so far the source code is only available through a Subversion checkout. McConnell said that Novell is committed to the project, however, and that reviving the project was slowed down by the need to do a full code review. He also posted to the project's user forum that work was underway to package the code for other Linux distributions, starting with OpenSUSE 11 and Debian.

The team is also working to update the software for compatibility with more recent releases of Mono, but improving support for other distributions will move much faster if those distributions join in the effort. There was widespread excitement in the Linux community when Novell announced the return of iFolder as an open source project. Hopefully that enthusiasm will be matched by contribution, when you combine its transparent replication, disconnected operation, and fine-grained user account management, iFolder holds significant promise.

Comments (25 posted)

System Applications

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Imaging Applications

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Version Control

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