Fix a panic in flow and cd into the test-client in run.sh

server/flow.go

@@ -76,7 +76,7 @@ func (h *HttpServer) flowCallback(rw http.ResponseWriter, req *http.Request, _ h
 	q := req.URL.Query()
 	state := q.Get("state")
 	n := strings.IndexByte(state, ':')
-	if !h.manager.CheckNamespace(state[:n]) {
+	if n == -1 || !h.manager.CheckNamespace(state[:n]) {
 		http.Error(rw, "Invalid state namespace", http.StatusBadRequest)
 		return
 	}

server/pages/pages.go

@@ -3,6 +3,7 @@ package pages
 import (
 	"embed"
 	_ "embed"
+	"errors"
 	"github.com/1f349/overlapfs"
 	"html/template"
 	"io"
@@ -26,7 +27,7 @@ func LoadPages(wd string) (err error) {
 		if wd != "" {
 			wwwDir := filepath.Join(wd, "www")
 			err = os.Mkdir(wwwDir, os.ModePerm)
-			if err != nil {
+			if err != nil && !errors.Is(err, os.ErrExist) {
 				return
 			}
 			wdFs := os.DirFS(wwwDir)

test-client/run.sh

@@ -1,2 +1,4 @@
 #!/bin/bash
+cd "$(dirname -- "$(readlink -f -- "$0";)";)"
+
 python3 -m http.server 2020