web: restore old path prefix behavior

Signed-off-by: Fabian Reinartz <freinartz@google.com>

web/web.go

@@ -757,13 +757,7 @@ func tmplFuncs(consolesPath string, opts *Options) template_text.FuncMap {
 			return time.Since(t) / time.Millisecond * time.Millisecond
 		},
 		"consolesPath": func() string { return consolesPath },
-		"pathPrefix": func() string {
-			if opts.RoutePrefix == "/" {
-				return ""
-			} else {
-				return opts.RoutePrefix
-			}
-		},
+		"pathPrefix":   func() string { return opts.ExternalURL.Path },
 		"buildVersion": func() string { return opts.Version.Revision },
 		"stripLabels": func(lset map[string]string, labels ...string) map[string]string {
 			for _, ln := range labels {

web/web_test.go

@@ -271,42 +271,6 @@ func TestRoutePrefix(t *testing.T) {
 	testutil.Ok(t, err)
 	testutil.Equals(t, http.StatusOK, resp.StatusCode)
 }
-
-func TestPathPrefix(t *testing.T) {
-
-	tests := []struct {
-		routePrefix string
-		pathPrefix  string
-	}{
-		{
-			routePrefix: "/",
-			// If we have pathPrefix as "/", URL in UI gets "//"" as prefix,
-			// hence doesn't remain relative path anymore.
-			pathPrefix: "",
-		},
-		{
-			routePrefix: "/prometheus",
-			pathPrefix:  "/prometheus",
-		},
-		{
-			routePrefix: "/p1/p2/p3/p4",
-			pathPrefix:  "/p1/p2/p3/p4",
-		},
-	}
-
-	for _, test := range tests {
-		opts := &Options{
-			RoutePrefix: test.routePrefix,
-		}
-
-		pathPrefix := tmplFuncs("", opts)["pathPrefix"].(func() string)
-		pp := pathPrefix()
-
-		testutil.Equals(t, test.pathPrefix, pp)
-	}
-
-}
-
 func TestDebugHandler(t *testing.T) {
 	for _, tc := range []struct {
 		prefix, url string