From e9bc92362b1bb68803b4afd39a112dfacee70ca1 Mon Sep 17 00:00:00 2001
From: Juan Batiz-Benet <juan@benet.ai>
Date: Sun, 6 Jul 2014 02:27:02 -0700
Subject: [PATCH] fuse using github.com/hanwen/go-fuse

---
 cli/ipfs.go               |   1 +
 cli/mount.go              |  47 +++++++++++++++++
 fuse/readonly/readonly.go | 105 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 153 insertions(+)
 create mode 100644 cli/mount.go
 create mode 100644 fuse/readonly/readonly.go

diff --git a/cli/ipfs.go b/cli/ipfs.go
index 1fcbbf154..e970ef634 100644
--- a/cli/ipfs.go
+++ b/cli/ipfs.go
@@ -42,6 +42,7 @@ Use "ipfs help <command>" for more information about a command.
 		cmdIpfsRefs,
 		cmdIpfsVersion,
 		cmdIpfsCommands,
+		cmdIpfsMount,
 	},
 	Flag: *flag.NewFlagSet("ipfs", flag.ExitOnError),
 }
diff --git a/cli/mount.go b/cli/mount.go
new file mode 100644
index 000000000..ac2327706
--- /dev/null
+++ b/cli/mount.go
@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"github.com/gonuts/flag"
+	"github.com/jbenet/commander"
+	rofs "github.com/jbenet/go-ipfs/fuse/readonly"
+	u "github.com/jbenet/go-ipfs/util"
+)
+
+var cmdIpfsMount = &commander.Command{
+	UsageLine: "mount",
+	Short:     "Mount an ipfs read-only mountpoint.",
+	Long: `ipfs mount <os-path> - Mount an ipfs read-only mountpoint.
+
+    Mount ipfs at a read-only mountpoint on the OS. All ipfs objects
+    will be accessible under that directory. Note that the root will
+    not be listable, as it is virtual. Accessing known paths directly.
+
+`,
+	Run:  mountCmd,
+	Flag: *flag.NewFlagSet("ipfs-mount", flag.ExitOnError),
+}
+
+func mountCmd(c *commander.Command, inp []string) error {
+	if len(inp) < 1 || len(inp[0]) == 0 {
+		u.POut(c.Long)
+		return nil
+	}
+
+	n, err := localNode()
+	if err != nil {
+		return err
+	}
+
+	mp := inp[0]
+	fmt.Printf("Mounting at %s\n", mp)
+
+	fs := rofs.NewFileSystem(n)
+	s, err := rofs.Mount(fs, mp)
+  if err != nil {
+    return err
+  }
+  s.SetDebug(true)
+	s.Serve()
+	return nil
+}
diff --git a/fuse/readonly/readonly.go b/fuse/readonly/readonly.go
new file mode 100644
index 000000000..1c238f131
--- /dev/null
+++ b/fuse/readonly/readonly.go
@@ -0,0 +1,105 @@
+// A Go mirror of libfuse's hello.c
+
+package readonly
+
+import (
+	"github.com/hanwen/go-fuse/fuse"
+	"github.com/hanwen/go-fuse/fuse/nodefs"
+	"github.com/hanwen/go-fuse/fuse/pathfs"
+	core "github.com/jbenet/go-ipfs/core"
+)
+
+type FileSystem struct {
+	Ipfs *core.IpfsNode
+	pathfs.FileSystem
+}
+
+func NewFileSystem(ipfs *core.IpfsNode) *FileSystem {
+	return &FileSystem{
+		Ipfs:       ipfs,
+		FileSystem: pathfs.NewDefaultFileSystem(),
+	}
+}
+
+func (s *FileSystem) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
+	if name == "/" { // -rw +x on root
+		return &fuse.Attr{Mode: fuse.S_IFDIR | 0111}, fuse.OK
+	}
+
+	nd, err := s.Ipfs.Resolver.ResolvePath(name)
+	if err != nil {
+		// todo: make this error more versatile.
+		return nil, fuse.ENOENT
+	}
+
+	// links? say dir. could have data...
+	if len(nd.Links) > 0 {
+		return &fuse.Attr{Mode: fuse.S_IFDIR | 0555}, fuse.OK
+	}
+
+	// size
+	size, _ := nd.Size()
+
+	// file.
+	return &fuse.Attr{
+		Mode: fuse.S_IFREG | 0444,
+		Size: uint64(size),
+	}, fuse.OK
+}
+
+func (s *FileSystem) OpenDir(name string, context *fuse.Context) (c []fuse.DirEntry, code fuse.Status) {
+	if name == "/" { // nope
+		return nil, fuse.EPERM
+	}
+
+	nd, err := s.Ipfs.Resolver.ResolvePath(name)
+	if err != nil {
+		// todo: make this error more versatile.
+		return nil, fuse.ENOENT
+	}
+
+	entries := make([]fuse.DirEntry, len(nd.Links))
+	for i, link := range nd.Links {
+		n := link.Name
+		if len(n) == 0 {
+			n = link.Hash.B58String()
+		}
+		entries[i] = fuse.DirEntry{Name: n, Mode: fuse.S_IFREG | 0444}
+	}
+
+	if len(entries) > 0 {
+		return entries, fuse.OK
+	}
+	return nil, fuse.ENOENT
+}
+
+func (s *FileSystem) Open(name string, flags uint32, context *fuse.Context) (
+	file nodefs.File, code fuse.Status) {
+
+	// read only, bro!
+	if flags&fuse.O_ANYWRITE != 0 {
+		return nil, fuse.EPERM
+	}
+
+	nd, err := s.Ipfs.Resolver.ResolvePath(name)
+	if err != nil {
+		// todo: make this error more versatile.
+		return nil, fuse.ENOENT
+	}
+
+	return nodefs.NewDataFile([]byte(nd.Data)), fuse.OK
+}
+
+func (s *FileSystem) String() string {
+  return "IpfsReadOnly"
+}
+
+func (s *FileSystem) OnMount(nodeFs *pathfs.PathNodeFs) {
+}
+
+func Mount(s *FileSystem, path string) (*fuse.Server, error) {
+  rfs := pathfs.NewReadonlyFileSystem(s)
+	fs := pathfs.NewPathNodeFs(rfs, nil)
+	ser, _, err := nodefs.MountRoot(path, fs.Root(), nil)
+	return ser, err
+}