Cross-platform FUSE library for Go

Cgofuse is a cross-platform FUSE library for Go. It is supported on multiple platforms and can be ported to any platform that has a FUSE implementation. It has cgo and !cgo ("nocgo") variants depending on the platform.

	macOS	FreeBSD	NetBSD	OpenBSD	Linux	Windows
cgo	✔️	✔️1	✔️2	✔️2	✔️	✔️
!cgo						✔️1

• 1: Requires Go 1.11.
• 2: NetBSD and OpenBSD support is experimental. There are known issues that stem from the differences in the NetBSD librefuse and OpenBSD libfuse implementations from the reference libfuse implementation.
  • NetBSD and OpenBSD: Option parsing may fail because the fuse_opt_parse function is not fully compatible with the one in libfuse.
  • OpenBSD only: Signal handling is broken due to a bug in the OpenBSD implementation of fuse_set_signal_handlers.

How to build

macOS

• Prerequisites: FUSE for macOS, command line tools
• Build:

  $ cd cgofuse
  $ go install -v ./fuse ./examples/memfs ./examples/passthrough
  

FreeBSD

• Prerequisites: fusefs-libs
• Build:

  $ cd cgofuse
  $ go install -v ./fuse ./examples/memfs ./examples/passthrough
  
  # You may also need the following in order to run FUSE file systems.
  # Commands must be run as root.
  $ vi /boot/loader.conf                      # add: fuse_load="YES"
  $ sysctl vfs.usermount=1                    # allow user mounts
  $ pw usermod USERNAME -G operator           # allow user to open /dev/fuse
  

NetBSD

• Prerequisites: NONE
• Build:

  $ cd cgofuse
  $ go install -v ./fuse ./examples/memfs ./examples/passthrough
  
  # You may also need the following in order to run FUSE file systems.
  # Commands must be run as root.
  $ chmod go+rw /dev/puffs
  $ sysctl -w vfs.generic.usermount=1
  

OpenBSD

• Prerequisites: NONE
• Build:

  $ cd cgofuse
  $ go install -v ./fuse ./examples/memfs ./examples/passthrough
  

• NOTE: OpenBSD 6 removed the kern.usermount option, which allowed non-root users to mount file systems [link]. Therefore you must be root in order to use FUSE and cgofuse.

Linux

• Prerequisites: libfuse-dev, gcc
• Build:

  $ cd cgofuse
  $ go install -v ./fuse ./examples/memfs ./examples/passthrough
  

Windows cgo

• Prerequisites: WinFsp, gcc (e.g. from Mingw-builds)
• Build:

  > cd cgofuse
  > set CPATH=C:\Program Files (x86)\WinFsp\inc\fuse
  > go install -v ./fuse ./examples/memfs
  

Windows !cgo

• Prerequisites: WinFsp
• Build:

  > cd cgofuse
  > set CGO_ENABLED=0
  > go install -v ./fuse ./examples/memfs
  

How to cross-compile your project using xgo

You can easily cross-compile your project using xgo and the billziss/xgo-cgofuse docker image.

• Prerequisites: docker, xgo
• Build:

  $ docker pull billziss/xgo-cgofuse
  $ go get -u github.com/karalabe/xgo
  $ cd YOUR-PROJECT-THAT-USES-CGOFUSE
  $ xgo --image=billziss/xgo-cgofuse \
      --targets=darwin/386,darwin/amd64,linux/386,linux/amd64,windows/386,windows/amd64 .
  

Cross-compilation only works for macOS, Linux and Windows.

How to use

User mode file systems are expected to implement fuse.FileSystemInterface. To make implementation simpler a file system can embed ("inherit") a fuse.FileSystemBase which provides default implementations for all operations. To mount a file system one must instantiate a fuse.FileSystemHost using fuse.NewFileSystemHost.

The full documentation is available at GoDoc.org: package fuse

There are currently three example file systems:

• Hellofs is an extremely simple file system. Runs on all OS'es.
• Memfs is an in memory file system. Runs on all OS'es.
• Passthrough is a file system that passes all operations to the underlying file system. Runs on all OS'es except Windows.

How it is tested

Cgofuse is regularly built and tested on Travis CI, Poor Man's CI and AppVeyor. The following software is being used to test cgofuse.

macOS

• fstest
• fsx

FreeBSD

• fsx

Linux

• fstest
• fsx

Windows (cgo and !cgo)

• winfsp-tests
• fsx

Contributors

• Bill Zissimopoulos <billziss at navimatics.com>
• Nick Craig-Wood <nick at craig-wood.com>