unixfs

package
Version: v0.4.12 Latest Latest
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Published: Nov 10, 2017 License: MIT Imports: 12 Imported by: 0

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Index

Constants

This section is empty.

Variables

View Source
var LsCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "List directory contents for Unix filesystem objects.",
		ShortDescription: `
Displays the contents of an IPFS or IPNS object(s) at the given path.

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.

This functionality is deprecated, and will be removed in future versions. If
possible, please use 'ipfs ls' instead.
`,
		LongDescription: `
Displays the contents of an IPFS or IPNS object(s) at the given path.

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.

The path can be a prefixless ref; in this case, we assume it to be an
/ipfs ref and not /ipns.

Example:

    > ipfs file ls QmW2WQi7j6c7UgJTarActp7tDNikE4B2qXtFCfLPdsgaTQ
    cat.jpg
    > ipfs file ls /ipfs/QmW2WQi7j6c7UgJTarActp7tDNikE4B2qXtFCfLPdsgaTQ
    cat.jpg

This functionality is deprecated, and will be removed in future versions. If
possible, please use 'ipfs ls' instead.
`,
	},

	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()

			resolver := &path.Resolver{
				DAG:         node.DAG,
				ResolveOnce: uio.ResolveUnixfsOnce,
			}

			merkleNode, err := core.Resolve(ctx, node.Namesys, resolver, path.Path(fpath))
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}

			c := merkleNode.Cid()

			hash := c.String()
			output.Arguments[fpath] = hash

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

				continue
			}

			ndpb, ok := merkleNode.(*merkledag.ProtoNode)
			if !ok {
				res.SetError(merkledag.ErrNotProtobuf, cmds.ErrNormal)
				return
			}

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

			t := unixFSNode.GetType()

			output.Objects[hash] = &LsObject{
				Hash: c.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() {
					linkNode, err := link.GetNode(ctx, node.DAG)
					if err != nil {
						res.SetError(err, cmds.ErrNormal)
						return
					}
					lnpb, ok := linkNode.(*merkledag.ProtoNode)
					if !ok {
						res.SetError(merkledag.ErrNotProtobuf, cmds.ErrNormal)
						return
					}

					d, err := unixfs.FromBytes(lnpb.Data())
					if err != nil {
						res.SetError(err, cmds.ErrNormal)
						return
					}
					t := d.GetType()
					lsLink := LsLink{
						Name: link.Name,
						Hash: link.Cid.String(),
						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{},
}
View Source
var UnixFSCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Interact with IPFS objects representing Unix filesystems.",
		ShortDescription: `
'ipfs file' provides a familiar interface to file systems represented
by IPFS objects, which hides ipfs implementation details like layout
objects (e.g. fanout and chunking).
`,
		LongDescription: `
'ipfs file' provides a familiar interface to file systems represented
by IPFS objects, which hides ipfs implementation details like layout
objects (e.g. fanout and chunking).
`,
	},

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

Functions

This section is empty.

Types

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
}

Source Files

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