unixfs

Documentation

Index

• Variables
• type LsLink
• type LsObject
• type LsOutput

Variables

var LsCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "List directory contents for Unix-filesystem objects.",
		ShortDescription: `
Retrieves the object named by <ipfs-or-ipns-path> and displays the
contents.

The JSON output contains size information.  For files, the child size
is the total size of the file contents.  For directories, the child
size is the IPFS link size.
`,
	},

	Arguments: []cmds.Argument{
		cmds.StringArg("ipfs-path", true, true, "The path to the IPFS object(s) to list links from.").EnableStdin(),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		node, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		paths := req.Arguments()

		output := LsOutput{
			Arguments: map[string]string{},
			Objects:   map[string]*LsObject{},
		}

		for _, fpath := range paths {
			ctx := req.Context()
			merkleNode, err := core.Resolve(ctx, node, path.Path(fpath))
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}

			key, err := merkleNode.Key()
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}

			hash := key.B58String()
			output.Arguments[fpath] = hash

			if _, ok := output.Objects[hash]; ok {

				continue
			}

			unixFSNode, err := unixfs.FromBytes(merkleNode.Data)
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}

			t := unixFSNode.GetType()

			output.Objects[hash] = &LsObject{
				Hash: key.String(),
				Type: t.String(),
				Size: unixFSNode.GetFilesize(),
			}

			switch t {
			case unixfspb.Data_File:
				break
			case unixfspb.Data_Directory:
				links := make([]LsLink, len(merkleNode.Links))
				output.Objects[hash].Links = links
				for i, link := range merkleNode.Links {
					link.Node, err = link.GetNode(ctx, node.DAG)
					if err != nil {
						res.SetError(err, cmds.ErrNormal)
						return
					}
					d, err := unixfs.FromBytes(link.Node.Data)
					if err != nil {
						res.SetError(err, cmds.ErrNormal)
						return
					}
					t := d.GetType()
					lsLink := LsLink{
						Name: link.Name,
						Hash: link.Hash.B58String(),
						Type: t.String(),
					}
					if t == unixfspb.Data_File {
						lsLink.Size = d.GetFilesize()
					} else {
						lsLink.Size = link.Size
					}
					links[i] = lsLink
				}
			case unixfspb.Data_Symlink:
				res.SetError(fmt.Errorf("cannot list symlinks yet"), cmds.ErrNormal)
				return
			default:
				res.SetError(fmt.Errorf("unrecognized type: %s", t), cmds.ErrImplementation)
				return
			}
		}

		res.SetOutput(&output)
	},
	Marshalers: cmds.MarshalerMap{
		cmds.Text: func(res cmds.Response) (io.Reader, error) {

			output := res.Output().(*LsOutput)
			buf := new(bytes.Buffer)
			w := tabwriter.NewWriter(buf, 1, 2, 1, ' ', 0)

			nonDirectories := []string{}
			directories := []string{}
			for argument, hash := range output.Arguments {
				object, ok := output.Objects[hash]
				if !ok {
					return nil, fmt.Errorf("unresolved hash: %s", hash)
				}

				if object.Type == "Directory" {
					directories = append(directories, argument)
				} else {
					nonDirectories = append(nonDirectories, argument)
				}
			}
			sort.Strings(nonDirectories)
			sort.Strings(directories)

			for _, argument := range nonDirectories {
				fmt.Fprintf(w, "%s\n", argument)
			}

			seen := map[string]bool{}
			for i, argument := range directories {
				hash := output.Arguments[argument]
				if _, ok := seen[hash]; ok {
					continue
				}
				seen[hash] = true

				object := output.Objects[hash]
				if i > 0 || len(nonDirectories) > 0 {
					fmt.Fprintln(w)
				}
				if len(output.Arguments) > 1 {
					for _, arg := range directories[i:] {
						if output.Arguments[arg] == hash {
							fmt.Fprintf(w, "%s:\n", arg)
						}
					}
				}
				for _, link := range object.Links {
					fmt.Fprintf(w, "%s\n", link.Name)
				}
			}
			w.Flush()

			return buf, nil
		},
	},
	Type: LsOutput{},
}

var UnixFSCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Interact with ipfs objects representing Unix filesystems.",
		ShortDescription: `
'ipfs file' provides a familar interface to filesystems represtented
by IPFS objects that hides IPFS-implementation details like layout
objects (e.g. fanout and chunking).
`,
		Synopsis: `
ipfs file ls <path>...  - List directory contents for <path>...
`,
	},

	Subcommands: map[string]*cmds.Command{
		"ls": LsCmd,
	},
}

Types

type LsLink

type LsLink struct {
	Name, Hash string
	Size       uint64
	Type       string
}

type LsObject

type LsObject struct {
	Hash  string
	Size  uint64
	Type  string
	Links []LsLink
}

type LsOutput

type LsOutput struct {
	Arguments map[string]string
	Objects   map[string]*LsObject
}