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patch.go
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patch.go
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package objectcmd
import (
"io"
"io/ioutil"
"strings"
key "github.com/ipfs/go-ipfs/blocks/key"
cmds "github.com/ipfs/go-ipfs/commands"
core "github.com/ipfs/go-ipfs/core"
dag "github.com/ipfs/go-ipfs/merkledag"
dagutils "github.com/ipfs/go-ipfs/merkledag/utils"
path "github.com/ipfs/go-ipfs/path"
ft "github.com/ipfs/go-ipfs/unixfs"
u "gx/ipfs/QmZNVWh8LLjAavuQ2JXuFmuYH3C11xo988vSgp7UQrTRj1/go-ipfs-util"
)
var ObjectPatchCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Create a new merkledag object based on an existing one.",
ShortDescription: `
'ipfs object patch <root> <cmd> <args>' is a plumbing command used to
build custom DAG objects. It mutates objects, creating new objects as a
result. This is the Merkle-DAG version of modifying an object.
`,
},
Arguments: []cmds.Argument{},
Subcommands: map[string]*cmds.Command{
"append-data": patchAppendDataCmd,
"add-link": patchAddLinkCmd,
"rm-link": patchRmLinkCmd,
"set-data": patchSetDataCmd,
},
}
func objectMarshaler(res cmds.Response) (io.Reader, error) {
o, ok := res.Output().(*Object)
if !ok {
return nil, u.ErrCast()
}
return strings.NewReader(o.Hash + "\n"), nil
}
var patchAppendDataCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Append data to the data segment of a dag node.",
ShortDescription: `
Append data to what already exists in the data segment in the given object.
Example:
$ echo "hello" | ipfs object patch $HASH append-data
Note: This does not append data to a file - it modifies the actual raw
data within an object. Objects have a max size of 1MB and objects larger than
the limit will not be respected by the network.
`,
},
Arguments: []cmds.Argument{
cmds.StringArg("root", true, false, "The hash of the node to modify."),
cmds.FileArg("data", true, false, "Data to append.").EnableStdin(),
},
Run: func(req cmds.Request, res cmds.Response) {
nd, err := req.InvocContext().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
root, err := path.ParsePath(req.Arguments()[0])
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
rootnd, err := core.Resolve(req.Context(), nd, root)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
fi, err := req.Files().NextFile()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
data, err := ioutil.ReadAll(fi)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
rootnd.Data = append(rootnd.Data, data...)
newkey, err := nd.DAG.Add(rootnd)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(&Object{Hash: newkey.B58String()})
},
Type: Object{},
Marshalers: cmds.MarshalerMap{
cmds.Text: objectMarshaler,
},
}
var patchSetDataCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Set the data field of an ipfs object.",
ShortDescription: `
Set the data of an ipfs object from stdin or with the contents of a file.
Example:
$ echo "my data" | ipfs object patch $MYHASH set-data
`,
},
Arguments: []cmds.Argument{
cmds.StringArg("root", true, false, "The hash of the node to modify."),
cmds.FileArg("data", true, false, "The data to set the object to.").EnableStdin(),
},
Run: func(req cmds.Request, res cmds.Response) {
nd, err := req.InvocContext().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
rp, err := path.ParsePath(req.Arguments()[0])
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
root, err := core.Resolve(req.Context(), nd, rp)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
fi, err := req.Files().NextFile()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
data, err := ioutil.ReadAll(fi)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
root.Data = data
newkey, err := nd.DAG.Add(root)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(&Object{Hash: newkey.B58String()})
},
Type: Object{},
Marshalers: cmds.MarshalerMap{
cmds.Text: objectMarshaler,
},
}
var patchRmLinkCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Remove a link from an object.",
ShortDescription: `
Removes a link by the given name from root.
`,
},
Arguments: []cmds.Argument{
cmds.StringArg("root", true, false, "The hash of the node to modify."),
cmds.StringArg("link", true, false, "Name of the link to remove."),
},
Run: func(req cmds.Request, res cmds.Response) {
nd, err := req.InvocContext().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
rootp, err := path.ParsePath(req.Arguments()[0])
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
root, err := core.Resolve(req.Context(), nd, rootp)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
path := req.Arguments()[1]
e := dagutils.NewDagEditor(root, nd.DAG)
err = e.RmLink(req.Context(), path)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
nnode, err := e.Finalize(nd.DAG)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
nk, err := nnode.Key()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(&Object{Hash: nk.B58String()})
},
Type: Object{},
Marshalers: cmds.MarshalerMap{
cmds.Text: objectMarshaler,
},
}
var patchAddLinkCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Add a link to a given object.",
ShortDescription: `
Add a Merkle-link to the given object and return the hash of the result.
Example:
$ EMPTY_DIR=$(ipfs object new unixfs-dir)
$ BAR=$(echo "bar" | ipfs add -q)
$ ipfs object patch $EMPTY_DIR add-link foo $BAR
This takes an empty directory, and adds a link named 'foo' under it, pointing to
a file containing 'bar', and returns the hash of the new object.
`,
},
Options: []cmds.Option{
cmds.BoolOption("p", "create", "Create intermediary nodes."),
},
Arguments: []cmds.Argument{
cmds.StringArg("root", true, false, "The hash of the node to modify."),
cmds.StringArg("name", true, false, "Name of link to create."),
cmds.StringArg("ref", true, false, "IPFS object to add link to."),
},
Run: func(req cmds.Request, res cmds.Response) {
nd, err := req.InvocContext().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
rootp, err := path.ParsePath(req.Arguments()[0])
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
root, err := core.Resolve(req.Context(), nd, rootp)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
path := req.Arguments()[1]
childk := key.B58KeyDecode(req.Arguments()[2])
create, _, err := req.Option("create").Bool()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
var createfunc func() *dag.Node
if create {
createfunc = func() *dag.Node {
return &dag.Node{Data: ft.FolderPBData()}
}
}
e := dagutils.NewDagEditor(root, nd.DAG)
childnd, err := nd.DAG.Get(req.Context(), childk)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
err = e.InsertNodeAtPath(req.Context(), path, childnd, createfunc)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
nnode, err := e.Finalize(nd.DAG)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
nk, err := nnode.Key()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(&Object{Hash: nk.B58String()})
},
Type: Object{},
Marshalers: cmds.MarshalerMap{
cmds.Text: objectMarshaler,
},
}