fix: Ensures directory path to db file exists

fixes #122

README.md

@@ -103,6 +103,20 @@ The UI can also be disabled via a runtime flag:
 temporalite start --headless
 ```
 
+## Development
+
+To compile the source run:
+
+```shell
+go build -o dist/temporalite ./cmd/temporalite 
+```
+
+To run all tests:
+
+```shell
+go test ./...
+```
+
 ## Known Issues
 
 - When consuming Temporalite as a library in go mod, you may want to replace grpc-gateway with a fork to address URL escaping issue in UI. See <https://github.com/temporalio/temporalite/pull/118>

cmd/temporalite/main.go

@@ -9,6 +9,7 @@ import (
 	goLog "log"
 	"net"
 	"os"
+	"path/filepath"
 	"strings"
 
 	"github.com/urfave/cli/v2"
@@ -155,6 +156,11 @@ func buildCLI() *cli.App {
 					return cli.Exit(fmt.Sprintf("ERROR: only one of %q or %q flags may be passed at a time", ephemeralFlag, dbPathFlag), 1)
 				}
 
+				err := os.MkdirAll(filepath.Dir(c.String(dbPathFlag)), os.ModePerm)
+				if err != nil {
+					return cli.Exit(err.Error(), 1)
+				}
+
 				switch c.String(logFormatFlag) {
 				case "json", "pretty":
 				default:

temporaltest/server_test.go

@@ -134,7 +134,7 @@ func TestDefaultWorkerOptions(t *testing.T) {
 	ts.NewWorker("hello_world", func(registry worker.Registry) {
 		helloworld.RegisterWorkflowsAndActivities(registry)
 	})
-	
+
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()