### Check existing issues - [x] I've verified that this bug isn't described by any existing issues. ### Bug description I started a remote-build. 3 out of the builds failed, and I manually cancelled the 4th. ([link](https://launchpad.net/~sed-i/sed-i-craft-remote-build/+snap/snapcraft-nushell-75301ebd25a0f7bfc4127cbebfb72467)) As soon as I cancelled the build, snapcraft returned with the following error: ``` > snapcraft remote-build remote-build is experimental and is subject to change. Use with caution. All data sent to remote builders will be publicly available. Are you sure you want to continue? [y/N]: y snapcraft internal error: MissingSchema("Invalid URL 'None': No scheme supplied. Perhaps you meant https://None?") ``` ### Steps to reproduce 1. Start a multi platform build for a buggy snap. In my case it was an "unbounded variable" - used a variable I didn't set. 2. Let a few build fail, then manually cancel the remaining one. ### Environment Ubuntu 24.04.3 LTS on multipass snapcraft 8.13.2 (16570) latest/stable ### snapcraft.yaml ```yaml I don't think it's specific to a snap ``` ### Log output ```shell 2026-01-17 02:17:26.571 Stopped: amd64, arm64, armhf, s390x; Building: riscv64 2026-01-17 02:17:58.213 Stopped: amd64, arm64, armhf, s390x; Building: riscv64 2026-01-17 02:18:29.557 Stopped: amd64, arm64, armhf, s390x; Building: riscv64 2026-01-17 02:19:01.806 Stopped: amd64, arm64, armhf, s390x; Building: riscv64 2026-01-17 02:19:34.359 Stopped: amd64, arm64, armhf, s390x; Building: riscv64 2026-01-17 02:20:06.421 Stopped: amd64, arm64, armhf, riscv64, s390x 2026-01-17 02:20:06.421 Fetching build artifacts... 2026-01-17 02:20:08.162 Fetching 5 build logs... 2026-01-17 02:20:08.167 snapcraft internal error: MissingSchema("Invalid URL 'None': No scheme supplied. Perhaps you meant https://None?") 2026-01-17 02:20:08.171 Traceback (most recent call last): 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/application.py", line 663, in run 2026-01-17 02:20:08.171 return_code = self._run_inner() 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/snapcraft/application.py", line 183, in _run_inner 2026-01-17 02:20:08.171 return_code = super()._run_inner() 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/application.py", line 640, in _run_inner 2026-01-17 02:20:08.171 return_code = dispatcher.run() or os.EX_OK 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_cli/dispatcher.py", line 564, in run 2026-01-17 02:20:08.171 return self._loaded_command.run(self._parsed_command_args) 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/commands/base.py", line 222, in run 2026-01-17 02:20:08.171 result = self._run(parsed_args, **kwargs) or result 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/commands/remote.py", line 165, in _run 2026-01-17 02:20:08.171 returncode = self._monitor_and_complete(builds=builds) 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/commands/remote.py", line 227, in _monitor_and_complete 2026-01-17 02:20:08.171 logs = builder.fetch_logs(pathlib.Path.cwd()) 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/services/remotebuild.py", line 194, in fetch_logs 2026-01-17 02:20:08.171 self.request.download_files_with_progress(log_downloads) 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/services/request.py", line 103, in download_files_with_progress 2026-01-17 02:20:08.171 sizes = [next(dl) for dl in downloads] 2026-01-17 02:20:08.171 ^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/craft_application/services/request.py", line 68, in download_chunks 2026-01-17 02:20:08.171 with self.get(url, stream=True) as download: 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/requests/sessions.py", line 602, in get 2026-01-17 02:20:08.171 return self.request("GET", url, **kwargs) 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/requests/sessions.py", line 575, in request 2026-01-17 02:20:08.171 prep = self.prepare_request(req) 2026-01-17 02:20:08.171 ^^^^^^^^^^^^^^^^^^^^^^^^^ 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/requests/sessions.py", line 484, in prepare_request 2026-01-17 02:20:08.171 p.prepare( 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/requests/models.py", line 367, in prepare 2026-01-17 02:20:08.171 self.prepare_url(url, params) 2026-01-17 02:20:08.171 File "/snap/snapcraft/16570/lib/python3.12/site-packages/requests/models.py", line 438, in prepare_url 2026-01-17 02:20:08.171 raise MissingSchema( 2026-01-17 02:20:08.171 requests.exceptions.MissingSchema: Invalid URL 'None': No scheme supplied. Perhaps you meant https://None? 2026-01-17 02:20:08.171 Full execution log: '/home/ubuntu/.local/state/snapcraft/log/snapcraft-20260117-010959.810411.log' ```