I have spotted this issue while I have tried to mount 2 volumes and execute any gitlab-ci job. Command which I have used is: > `gitlabci-local -S -v C:\Users\ZajacK\.kube:/etc/kube -v C:\Users\ZajacK\.m2:/root/.m2 -e KUBECONFIG=/etc/kube/config` After choosing any job from menu following exception is thrown: ``` Traceback (most recent call last): File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\api\client.py", line 268, in _raise_for_status response.raise_for_status() File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\requests\models.py", line 943, in raise_for_status raise HTTPError(http_error_msg, response=self) requests.exceptions.HTTPError: 500 Server Error: Internal Server Error for url: http+docker://localnpipe/v1.41/containers/create During handling of the above exception, another exception occurred: Traceback (most recent call last): File "c:\users\zajack\appdata\local\programs\python\python39\lib\runpy.py", line 197, in _run_module_as_main return _run_code(code, main_globals, None, File "c:\users\zajack\appdata\local\programs\python\python39\lib\runpy.py", line 87, in _run_code exec(code, run_globals) File "C:\Users\ZajacK\AppData\Local\Programs\Python\Python39\Scripts\gitlabci-local.exe\__main__.py", line 7, in <module> File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\gitlabci_local\cli\main.py", line 253, in main result = MenusFeature(jobs=jobs, options=options).select() File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\gitlabci_local\features\menus.py", line 153, in select result = PipelinesFeature(self.__jobs, self.__options).launch() File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\gitlabci_local\features\pipelines.py", line 70, in launch result = Jobs(options=self.__options).run(self.__jobs[job], result, File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\gitlabci_local\jobs\runner.py", line 402, in run result = self.__run_container(variables, path_parent, target_parent, image, File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\gitlabci_local\jobs\runner.py", line 97, in __run_container container = self.__engine.run(image, script_file.target(), entrypoint, variables, File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\gitlabci_local\engines\engine.py", line 142, in run return self.__engine.run(image, command, entrypoint, variables, network, volumes, File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\gitlabci_local\engines\docker.py", line 118, in run return self.__client.containers.run( File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\models\containers.py", line 811, in run container = self.create(image=image, command=command, File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\models\containers.py", line 870, in create resp = self.client.api.create_container(**create_kwargs) File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\api\container.py", line 430, in create_container return self.create_container_from_config(config, name) File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\api\container.py", line 441, in create_container_from_config return self._result(res, True) File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\api\client.py", line 274, in _result self._raise_for_status(response) File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\api\client.py", line 270, in _raise_for_status raise create_api_error_from_http_exception(e) File "c:\users\zajack\appdata\local\programs\python\python39\lib\site-packages\docker\errors.py", line 31, in create_api_error_from_http_exception raise cls(e, response=response, explanation=explanation) docker.errors.APIError: 500 Server Error for http+docker://localnpipe/v1.41/containers/create: Internal Server Error ("b'C\\.%!(EXTRA string=is not a valid Windows path)'") ``` I did some quick look how volumes are resolved by modifying engine/docker.py script: ``` def run(self, image, command, entrypoint, variables, network, volumes, directory): print(volumes.get()) ``` and I got following outcome: ``` {'C:\\Users\\ZajacK\\IdeaProjects': {'bind': '/builds', 'mode': 'rw', '.source': 'C:\\Users\\ZajacK\\IdeaProjects'}, 'C': {'bind': '\\Users\\ZajacK\\.kube', 'mode': '/etc/kube', '.source': 'C'}, 'C\\.': {'bind': '\\Users\\ZajacK\\.m2', 'mode': '/root/.m2', '.source': 'C\\.'}, '/var/run/docker.sock': {'bind': '/var/run/docker.sock', 'mode': 'rw', '.source': '/var/run/docker.sock'}}` ``` I guess that somewhere earlier at the code parser for volumes has got bug and is splitting string by ":" character, not having in mind that if OS is windows then file path would have ":" after drive letter. Although I have not verified that and didn't dig deep enough. Maybe there is some regexp library or system library which could be use to determine valid paths for given OS ? At windows environment it there can be paths having driver letter followed by ":" character but as well network paths which won't have it - f.e. \\host\share\folder\file