aferofuse

Have you ever thought: I really like X file system Go implementation but I sure wish I could expose it to the whole operating system. Well, you are in luck!

This is exactly what aferofuse is. Taken from the two libraries: afero and fuse - aferofuse aims to expose internal Go abstract filesystems to the linux operating system by using the fuse library.

why?

My original reason to implement this was to faciliate a tool that could limit a directory's size. I searched all over the web for about 3.5 seconds, found nothing(or most likely didn't read through anything) and decided to implement this library.

how?

Start by getting the library:

go get github.com/lemondevxyz/aferofuse

Afterwards, just borrow the code from example/osfs/main.go and modify it to your liking! Too lazy to go there? Lucky for you I have a code snippet ready:

package main

import (
    "flag"
    "log"

    "github.com/hanwen/go-fuse/v2/fs"
    "github.com/hanwen/go-fuse/v2/fuse/nodefs"
    "github.com/hanwen/go-fuse/v2/fuse/pathfs"
    "github.com/lemondevxyz/aferofuse"
    "github.com/spf13/afero"
)

type embeddedINode struct {
    inode *fs.Inode
}

func (e *embeddedINode) EmbeddedInode() *fs.Inode {
    return e.inode
}

func main() {
    base := flag.String("base", "", "the base path to 'contain' the os filesystem")
    debug := flag.Bool("debug", false, "print debug data")
    flag.Parse()
    if len(flag.Args()) < 1 {
        log.Fatal("Usage:\n  osfs MOUNTPOINT")
    }

    afs := afero.NewBasePathFs(afero.NewOsFs(), *base)
    fusefs := aferofuse.NewFuseFileSystem(afs)

    opts := &nodefs.Options{}
    opts.Debug = *debug

    mynodefs := pathfs.NewPathNodeFs(fusefs, &pathfs.PathNodeFsOptions{
        ClientInodes: true,
    })
    server, _, err := nodefs.MountRoot(flag.Arg(0), mynodefs.Root(), opts)
    if err != nil {
        log.Fatalf("Mount fail: %v\n", err)
    }
    log.Println("Mounted!")
    server.Serve()
}

what's left?

• Internal unit testing
• GitHub actions code coverage
• Testing through a stressor like iozone
• Release v0.1.0