swarm/api: Fix adding paths which exist as manifests (ethereum#14482)

Signed-off-by: Lewis Marshall <[email protected]>

swarm/api/manifest.go

@@ -237,12 +237,12 @@ func (self *manifestTrie) addEntry(entry *manifestTrieEntry, quitC chan bool) {
 	}
 
 	b := byte(entry.Path[0])
-	if (self.entries[b] == nil) || (self.entries[b].Path == entry.Path) {
+	oldentry := self.entries[b]
+	if (oldentry == nil) || (oldentry.Path == entry.Path && oldentry.ContentType != ManifestType) {
 		self.entries[b] = entry
 		return
 	}
 
-	oldentry := self.entries[b]
 	cpl := 0
 	for (len(entry.Path) > cpl) && (len(oldentry.Path) > cpl) && (entry.Path[cpl] == oldentry.Path[cpl]) {
 		cpl++

swarm/api/manifest_test.go

@@ -18,6 +18,8 @@ package api
 
 import (
 	// "encoding/json"
+	"bytes"
+	"encoding/json"
 	"fmt"
 	"io"
 	"strings"
@@ -78,3 +80,34 @@ func TestGetEntry(t *testing.T) {
 func TestDeleteEntry(t *testing.T) {
 
 }
+
+// TestAddFileWithManifestPath tests that adding an entry at a path which
+// already exists as a manifest just adds the entry to the manifest rather
+// than replacing the manifest with the entry
+func TestAddFileWithManifestPath(t *testing.T) {
+	// create a manifest containing "ab" and "ac"
+	manifest, _ := json.Marshal(&Manifest{
+		Entries: []ManifestEntry{
+			{Path: "ab", Hash: "ab"},
+			{Path: "ac", Hash: "ac"},
+		},
+	})
+	reader := &storage.LazyTestSectionReader{
+		SectionReader: io.NewSectionReader(bytes.NewReader(manifest), 0, int64(len(manifest))),
+	}
+	trie, err := readManifest(reader, nil, nil, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	checkEntry(t, "ab", "ab", trie)
+	checkEntry(t, "ac", "ac", trie)
+
+	// now add path "a" and check we can still get "ab" and "ac"
+	entry := &manifestTrieEntry{}
+	entry.Path = "a"
+	entry.Hash = "a"
+	trie.addEntry(entry, nil)
+	checkEntry(t, "ab", "ab", trie)
+	checkEntry(t, "ac", "ac", trie)
+	checkEntry(t, "a", "a", trie)
+}