parser: fix parsing Modelfiles with multiple FROM commands (#8449)

parser/parser.go

@@ -62,7 +62,13 @@ func (f Modelfile) CreateRequest(relativeDir string) (*api.CreateRequest, error)
 				return nil, err
 			}
 
+			if req.Files == nil {
 				req.Files = digestMap
+			} else {
+				for k, v := range digestMap {
+					req.Files[k] = v
+				}
+			}
 		case "adapter":
 			path, err := expandPath(c.Args, relativeDir)
 			if err != nil {

parser/parser_test.go

@@ -793,15 +793,20 @@ func createBinFile(t *testing.T, kv map[string]any, ti []llm.Tensor) (string, st
 }
 
 func TestCreateRequestFiles(t *testing.T) {
-	name, digest := createBinFile(t, nil, nil)
+	n1, d1 := createBinFile(t, nil, nil)
+	n2, d2 := createBinFile(t, map[string]any{"foo": "bar"}, nil)
 
 	cases := []struct {
 		input    string
 		expected *api.CreateRequest
 	}{
 		{
-			fmt.Sprintf("FROM %s", name),
-			&api.CreateRequest{Files: map[string]string{name: digest}},
+			fmt.Sprintf("FROM %s", n1),
+			&api.CreateRequest{Files: map[string]string{n1: d1}},
+		},
+		{
+			fmt.Sprintf("FROM %s\nFROM %s", n1, n2),
+			&api.CreateRequest{Files: map[string]string{n1: d1, n2: d2}},
 		},
 	}