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readonly_unix.go
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readonly_unix.go
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// +build linux darwin freebsd
// package fuse/readonly implements a fuse filesystem to access files
// stored inside of ipfs.
package readonly
import (
"bytes"
"io"
"os"
fuse "github.com/jbenet/go-ipfs/Godeps/_workspace/src/bazil.org/fuse"
fs "github.com/jbenet/go-ipfs/Godeps/_workspace/src/bazil.org/fuse/fs"
proto "github.com/jbenet/go-ipfs/Godeps/_workspace/src/code.google.com/p/goprotobuf/proto"
"github.com/jbenet/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
core "github.com/jbenet/go-ipfs/core"
mdag "github.com/jbenet/go-ipfs/merkledag"
path "github.com/jbenet/go-ipfs/path"
eventlog "github.com/jbenet/go-ipfs/thirdparty/eventlog"
uio "github.com/jbenet/go-ipfs/unixfs/io"
ftpb "github.com/jbenet/go-ipfs/unixfs/pb"
lgbl "github.com/jbenet/go-ipfs/util/eventlog/loggables"
)
var log = eventlog.Logger("fuse/ipfs")
// FileSystem is the readonly Ipfs Fuse Filesystem.
type FileSystem struct {
Ipfs *core.IpfsNode
}
// NewFileSystem constructs new fs using given core.IpfsNode instance.
func NewFileSystem(ipfs *core.IpfsNode) *FileSystem {
return &FileSystem{Ipfs: ipfs}
}
// Root constructs the Root of the filesystem, a Root object.
func (f FileSystem) Root() (fs.Node, fuse.Error) {
return &Root{Ipfs: f.Ipfs}, nil
}
// Root is the root object of the filesystem tree.
type Root struct {
Ipfs *core.IpfsNode
}
// Attr returns file attributes.
func (*Root) Attr() fuse.Attr {
return fuse.Attr{Mode: os.ModeDir | 0111} // -rw+x
}
// Lookup performs a lookup under this node.
func (s *Root) Lookup(name string, intr fs.Intr) (fs.Node, fuse.Error) {
log.Debugf("Root Lookup: '%s'", name)
switch name {
case "mach_kernel", ".hidden", "._.":
// Just quiet some log noise on OS X.
return nil, fuse.ENOENT
}
nd, err := s.Ipfs.Resolver.ResolvePath(path.Path(name))
if err != nil {
// todo: make this error more versatile.
return nil, fuse.ENOENT
}
return &Node{Ipfs: s.Ipfs, Nd: nd}, nil
}
// ReadDir reads a particular directory. Disallowed for root.
func (*Root) ReadDir(intr fs.Intr) ([]fuse.Dirent, fuse.Error) {
log.Debug("Read Root.")
return nil, fuse.EPERM
}
// Node is the core object representing a filesystem tree node.
type Node struct {
Ipfs *core.IpfsNode
Nd *mdag.Node
fd *uio.DagReader
cached *ftpb.Data
}
func (s *Node) loadData() error {
s.cached = new(ftpb.Data)
return proto.Unmarshal(s.Nd.Data, s.cached)
}
// Attr returns the attributes of a given node.
func (s *Node) Attr() fuse.Attr {
log.Debug("Node attr.")
if s.cached == nil {
s.loadData()
}
switch s.cached.GetType() {
case ftpb.Data_Directory:
return fuse.Attr{Mode: os.ModeDir | 0555}
case ftpb.Data_File:
size := s.cached.GetFilesize()
return fuse.Attr{
Mode: 0444,
Size: uint64(size),
Blocks: uint64(len(s.Nd.Links)),
}
case ftpb.Data_Raw:
return fuse.Attr{
Mode: 0444,
Size: uint64(len(s.cached.GetData())),
Blocks: uint64(len(s.Nd.Links)),
}
default:
log.Debug("Invalid data type.")
return fuse.Attr{}
}
}
// Lookup performs a lookup under this node.
func (s *Node) Lookup(name string, intr fs.Intr) (fs.Node, fuse.Error) {
log.Debugf("Lookup '%s'", name)
nodes, err := s.Ipfs.Resolver.ResolveLinks(s.Nd, []string{name})
if err != nil {
// todo: make this error more versatile.
return nil, fuse.ENOENT
}
return &Node{Ipfs: s.Ipfs, Nd: nodes[len(nodes)-1]}, nil
}
// ReadDir reads the link structure as directory entries
func (s *Node) ReadDir(intr fs.Intr) ([]fuse.Dirent, fuse.Error) {
log.Debug("Node ReadDir")
entries := make([]fuse.Dirent, len(s.Nd.Links))
for i, link := range s.Nd.Links {
n := link.Name
if len(n) == 0 {
n = link.Hash.B58String()
}
entries[i] = fuse.Dirent{Name: n, Type: fuse.DT_File}
}
if len(entries) > 0 {
return entries, nil
}
return nil, fuse.ENOENT
}
func (s *Node) Read(req *fuse.ReadRequest, resp *fuse.ReadResponse, intr fs.Intr) fuse.Error {
// intr will be closed by fuse if the request is cancelled. turn this into a context.
ctx, cancel := context.WithCancel(context.TODO())
defer cancel() // make sure all operations we started close.
// we wait on intr and cancel our context if it closes.
go func() {
select {
case <-intr: // closed by fuse
cancel() // cancel our context
case <-ctx.Done():
}
}()
k, err := s.Nd.Key()
if err != nil {
return err
}
// setup our logging event
lm := make(lgbl.DeferredMap)
lm["fs"] = "ipfs"
lm["key"] = func() interface{} { return k.Pretty() }
lm["req_offset"] = req.Offset
lm["req_size"] = req.Size
defer log.EventBegin(ctx, "fuseRead", lm).Done()
r, err := uio.NewDagReader(ctx, s.Nd, s.Ipfs.DAG)
if err != nil {
return err
}
o, err := r.Seek(req.Offset, os.SEEK_SET)
lm["res_offset"] = o
if err != nil {
return err
}
buf := bytes.NewBuffer(resp.Data)
n, err := io.CopyN(buf, r, int64(req.Size))
if err != nil && err != io.EOF {
return err
}
resp.Data = resp.Data[:n]
lm["res_size"] = n
return nil // may be non-nil / not succeeded
}