".git" extension is not allowed on the end of the repository name since it confuses the git protocol

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Fixed
+- Repository names may not end with ".git" ([#1277](https://github.com/scm-manager/scm-manager/pull/1277))
+
 ## [2.3.1] - 2020-08-04
 ### Added
 - New api to resolve SCM-Manager root url ([#1276](https://github.com/scm-manager/scm-manager/pull/1276))

scm-ui/ui-webapp/src/repos/components/form/repositoryValidation.ts

@@ -24,7 +24,7 @@
 
 import { validation } from "@scm-manager/ui-components";
 
-const nameRegex = /(?!^\.\.$)(?!^\.$)(?!.*[\\\[\]])^[A-Za-z0-9\.][A-Za-z0-9\.\-_]*$/;
+const nameRegex = /(?!^\.\.$)(?!^\.$)(?!.*[.]git$)(?!.*[\\\[\]])^[A-Za-z0-9\.][A-Za-z0-9\.\-_]*$/;
 
 export const isNameValid = (name: string) => {
   return nameRegex.test(name);