GO-FUSE: native bindings for the FUSE kernel module.
HIGHLIGHTS
* High speed: less than 50% slower than libfuse, using the gc
compiler. For most real world applications, the difference will be
negligible.
* Supports in-process mounting of different FileSystems onto
subdirectories of the FUSE mount.
* Includes two fleshed out examples, zipfs and unionfs.
EXAMPLES
* examples/hello/hello.go contains a 60-line "hello world" filesystem
* zipfs/zipfs.go contains a small and simple read-only filesystem for
zip and tar files. The corresponding command is in example/zipfs/
For example,
mkdir /tmp/mountpoint
example/zipfs/zipfs /tmp/mountpoint file.zip &
ls /tmp/mountpoint
fusermount -u /tmp/mountpoint
* zipfs/multizipfs.go shows how to use in-process mounts to
combine multiple Go-FUSE filesystems into a larger filesystem.
* fuse/loopback.go mounts another piece of the filesystem.
Functionally, it is similar to a symlink. A binary to run is in
example/loopback/ . For example
mkdir /tmp/mountpoint
example/loopback/loopback -debug /tmp/mountpoint /some/other/directory &
ls /tmp/mountpoint
fusermount -u /tmp/mountpoint
* unionfs/unionfs.go: implements a union mount using 1 R/W branch, and
multiple R/O branches.
mkdir -p /tmp/mountpoint /tmp/writable
example/unionfs/unionfs /tmp/mountpoint /tmp/writable /usr &
ls /tmp/mountpoint
ls -l /tmp/mountpoint/bin/vi
rm /tmp/mountpoint/bin/vi
ls -l /tmp/mountpoint/bin/vi
cat /tmp/writable/*DELETION*/*
* union/autounionfs.go: creates UnionFs mounts automatically based on
existence of READONLY symlinks.
Tested on:
- x86 32bits (Fedora 14).
- x86 64bits (Ubuntu Lucid).
BENCHMARKS
We use threaded stats over a read-only filesystem for benchmarking. A
script to do this is in example/benchmark.sh. A libfuse baseline is
given by running the same test against archivemount
(http://www.cybernoia.de/software/archivemount/), with the locks in
its GetAttr implementation removed.
Data points (time per stat, Go-FUSE version May 1), using java 1.6
src.zip (7000 files).
platform libfuse Go-FUSE difference (%)
Lenovo T60 (2cpu) 83us 99us 19%
Lenovo T400 (2cpu) 38us 58us 52%
DellT3500/Lucid (2cpu) 34us(*) 35us 3%
DellT3500/Lucid (6cpu) 59us 76us 28%
(*) libfuse does not limit the number worker threads. In the
T3500/2cpu case, the daemon may still run on 6 CPUs (with associated
scaling overhead.)
CREDITS
* Inspired by Taru Karttunen's package, https://bitbucket.org/taruti/go-extra.
* Originally based on Ivan Krasin's https://github.com/krasin/go-fuse-zip
BUGS
Yes, probably. Report them through golang-nuts@googlegroups.com.
KNOWN PROBLEMS
Grep source code for TODO. Major topics:
* Missing support for file locking: FUSE_GETLK, FUSE_SETLK, FUSE_SETLKW
* Missing support for FUSE_INTERRUPT, FUSE_NOTIFY, CUSE, BMAP, POLL,
IOCTL, STATFS
* Partial support for mounting as root (The high level FS api does not
yet pass caller Uid/Gid/Pid)
* In the high-level API, renames are racy; See also:
http://sourceforge.net/mailarchive/message.php?msg_id=27550667
LICENSE
Like Go, this library is distributed under the new BSD license. See
accompanying LICENSE file.