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diff.go
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diff.go
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package objectcmd
import (
"bytes"
"fmt"
"io"
cmds "github.com/ipfs/go-ipfs/commands"
core "github.com/ipfs/go-ipfs/core"
dagutils "github.com/ipfs/go-ipfs/merkledag/utils"
path "github.com/ipfs/go-ipfs/path"
)
type Changes struct {
Changes []*dagutils.Change
}
var ObjectDiffCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Takes a diff of the two given objects.",
ShortDescription: `
'ipfs object diff' is a command used to show the differences between
two ipfs objects.`,
LongDescription: `
'ipfs object diff' is a command used to show the differences between
two ipfs objects.
Example:
> ls foo
bar baz/ giraffe
> ipfs add -r foo
...
Added QmegHcnrPgMwC7tBiMxChD54fgQMBUecNw9nE9UUU4x1bz foo
> OBJ_A=QmegHcnrPgMwC7tBiMxChD54fgQMBUecNw9nE9UUU4x1bz
> echo "different content" > foo/bar
> ipfs add -r foo
...
Added QmcmRptkSPWhptCttgHg27QNDmnV33wAJyUkCnAvqD3eCD foo
> OBJ_B=QmcmRptkSPWhptCttgHg27QNDmnV33wAJyUkCnAvqD3eCD
> ipfs object diff -v $OBJ_A $OBJ_B
Changed "bar" from QmNgd5cz2jNftnAHBhcRUGdtiaMzb5Rhjqd4etondHHST8 to QmRfFVsjSXkhFxrfWnLpMae2M4GBVsry6VAuYYcji5MiZb.
`,
},
Arguments: []cmds.Argument{
cmds.StringArg("obj_a", true, false, "Object to diff against."),
cmds.StringArg("obj_b", true, false, "Object to diff."),
},
Options: []cmds.Option{
cmds.BoolOption("verbose", "v", "Produce verbose output."),
},
Run: func(req cmds.Request, res cmds.Response) {
node, err := req.InvocContext().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
a := req.Arguments()[0]
b := req.Arguments()[1]
pa, err := path.ParsePath(a)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
pb, err := path.ParsePath(b)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
ctx := req.Context()
obj_a, err := core.Resolve(ctx, node, pa)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
obj_b, err := core.Resolve(ctx, node, pb)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
changes, err := dagutils.Diff(ctx, node.DAG, obj_a, obj_b)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(&Changes{changes})
},
Type: Changes{},
Marshalers: cmds.MarshalerMap{
cmds.Text: func(res cmds.Response) (io.Reader, error) {
verbose, _, _ := res.Request().Option("v").Bool()
changes := res.Output().(*Changes)
buf := new(bytes.Buffer)
for _, change := range changes.Changes {
if verbose {
switch change.Type {
case dagutils.Add:
fmt.Fprintf(buf, "Added new link %q pointing to %s.\n", change.Path, change.After)
case dagutils.Mod:
fmt.Fprintf(buf, "Changed %q from %s to %s.\n", change.Path, change.Before, change.After)
case dagutils.Remove:
fmt.Fprintf(buf, "Removed link %q (was %s).\n", change.Path, change.Before)
}
} else {
switch change.Type {
case dagutils.Add:
fmt.Fprintf(buf, "+ %s %q\n", change.After, change.Path)
case dagutils.Mod:
fmt.Fprintf(buf, "~ %s %s %q\n", change.Before, change.After, change.Path)
case dagutils.Remove:
fmt.Fprintf(buf, "- %s %q\n", change.Before, change.Path)
}
}
}
return buf, nil
},
},
}