IPLD In IPFS: Target Merge Branch (#67)

* update go-path and error message
* add node api for prime interactions
* use go-unixfsnode
* update against fetcher

Co-authored-by: acruikshank <acruikshank@example.com>

This commit was moved from ipfs/interface-go-ipfs-core@49cdff8

coreiface/coreapi.go

@@ -4,6 +4,7 @@ package iface
 
 import (
 	"context"
+
 	path "github.com/ipfs/interface-go-ipfs-core/path"
 
 	"github.com/ipfs/interface-go-ipfs-core/options"

coreiface/tests/path.go

@@ -2,11 +2,14 @@ package tests
 
 import (
 	"context"
-	"github.com/ipfs/interface-go-ipfs-core/path"
+	"errors"
 	"math"
 	"strings"
 	"testing"
 
+	"github.com/ipfs/go-path/resolver"
+	"github.com/ipfs/interface-go-ipfs-core/path"
+
 	"github.com/ipfs/interface-go-ipfs-core/options"
 
 	ipldcbor "github.com/ipfs/go-ipld-cbor"
@@ -138,7 +141,7 @@ func (tp *TestSuite) TestInvalidPathRemainder(t *testing.T) {
 	}
 
 	_, err = api.ResolvePath(ctx, path.New("/ipld/"+nd.Cid().String()+"/bar/baz"))
-	if err == nil || !strings.Contains(err.Error(), "no such link found") {
+	if err == nil || !errors.As(err, &resolver.ErrNoLink{}) {
 		t.Fatalf("unexpected error: %s", err)
 	}
 }