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DwarFS – Deduplicating Warp-Speed Advanced Read-Only File System

A fast high compression read-only file system for Linux, Windows and macOS - mhx/dwarfs

I started working on DwarFS in 2013 and my main use case and major motivation was that I had several hundred different versions of Perl that were taking up something around 30 gigabytes of disk space, and I was unwilling to spend more than 10% of my hard drive keeping them around for when I happened to need them. This alone wouldn't have been enough to get me into writing DwarFS, but at around the same time, I was pretty obsessed with the recent developments and features of newer C++ standards and really wanted a C++ hobby project to work on. Judging from that, it would have probably taken about half an hour for a single run, which makes at least the--solid wim image pretty much unusable for actually working with the file system.

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