multi: use prev output fetcher in sign desc

cmd/chantools/sweepremoteclosed.go

@@ -223,10 +223,11 @@ func sweepRemoteClosed(extendedKey *hdkeychain.ExtendedKey, apiURL,
 			})
 
 			signDescs = append(signDescs, &input.SignDescriptor{
-				KeyDesc:       *target.keyDesc,
+				KeyDesc:           *target.keyDesc,
-				WitnessScript: target.script,
+				WitnessScript:     target.script,
-				Output:        prevTxOut,
+				Output:            prevTxOut,
-				HashType:      txscript.SigHashAll,
+				HashType:          txscript.SigHashAll,
+				PrevOutputFetcher: prevOutFetcher,
 			})
 		}
 	}

cmd/chantools/sweeptimelock.go

@@ -271,9 +271,10 @@ func sweepTimeLock(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 				target.commitPoint,
 				target.delayBasePointDesc.PubKey,
 			),
-			WitnessScript: script,
+			WitnessScript:     script,
-			Output:        prevTxOut,
+			Output:            prevTxOut,
-			HashType:      txscript.SigHashAll,
+			HashType:          txscript.SigHashAll,
+			PrevOutputFetcher: prevOutFetcher,
 		}
 		totalOutputValue += target.value
 		signDescs = append(signDescs, signDesc)

cmd/chantools/sweeptimelockmanual.go

@@ -271,9 +271,10 @@ func sweepTimeLockManual(extendedKey *hdkeychain.ExtendedKey, apiURL string,
 			PkScript: scriptHash,
 			Value:    sweepValue,
 		},
-		InputIndex: 0,
+		InputIndex:        0,
-		SigHashes:  sigHashes,
+		SigHashes:         sigHashes,
-		HashType:   txscript.SigHashAll,
+		PrevOutputFetcher: prevOutFetcher,
+		HashType:          txscript.SigHashAll,
 	}
 	witness, err := input.CommitSpendTimeout(signer, signDesc, sweepTx)
 	if err != nil {

lnd/signer.go

@@ -135,11 +135,12 @@ func (s *Signer) AddPartialSignature(packet *psbt.Packet,
 	// Now we add our partial signature.
 	prevOutFetcher := wallet.PsbtPrevOutputFetcher(packet)
 	signDesc := &input.SignDescriptor{
-		KeyDesc:       keyDesc,
+		KeyDesc:           keyDesc,
-		WitnessScript: witnessScript,
+		WitnessScript:     witnessScript,
-		Output:        utxo,
+		Output:            utxo,
-		InputIndex:    inputIndex,
+		InputIndex:        inputIndex,
-		HashType:      txscript.SigHashAll,
+		HashType:          txscript.SigHashAll,
+		PrevOutputFetcher: prevOutFetcher,
 		SigHashes: txscript.NewTxSigHashes(
 			packet.UnsignedTx, prevOutFetcher,
 		),