Add gitea manager reload-templates command (#24843)

This can be useful to update custom templates in production mode, when
they are updated frequently and a full Gitea restart each time is
disruptive.

routers/private/internal.go

@@ -67,6 +67,7 @@ func Routes() *web.Route {
 	r.Get("/serv/command/{keyid}/{owner}/{repo}", ServCommand)
 	r.Post("/manager/shutdown", Shutdown)
 	r.Post("/manager/restart", Restart)
+	r.Post("/manager/reload-templates", ReloadTemplates)
 	r.Post("/manager/flush-queues", bind(private.FlushOptions{}), FlushQueues)
 	r.Post("/manager/pause-logging", PauseLogging)
 	r.Post("/manager/resume-logging", ResumeLogging)

routers/private/manager.go

@@ -15,9 +15,22 @@ import (
 	"code.gitea.io/gitea/modules/private"
 	"code.gitea.io/gitea/modules/queue"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/templates"
 	"code.gitea.io/gitea/modules/web"
 )
 
+// ReloadTemplates reloads all the templates
+func ReloadTemplates(ctx *context.PrivateContext) {
+	err := templates.ReloadHTMLTemplates()
+	if err != nil {
+		ctx.JSON(http.StatusInternalServerError, private.Response{
+			UserMsg: fmt.Sprintf("Template error: %v", err),
+		})
+		return
+	}
+	ctx.PlainText(http.StatusOK, "success")
+}
+
 // FlushQueues flushes all the Queues
 func FlushQueues(ctx *context.PrivateContext) {
 	opts := web.GetForm(ctx).(*private.FlushOptions)