Include the service name in the error message when it's extends does …

[jan-matejka]

[p12tic]

Thanks for the PR. What are the reproduction steps for the bug this PR is trying to fix?

[jan-matejka]

% cat compose.yaml 
services:
  foo:
    extends:
      service: bar

% pc build foo
Traceback (most recent call last):
  File "/home/alex/pc2/bin/podman-compose", line 8, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/alex/pc2/lib/python3.13/site-packages/podman_compose.py", line 4256, in main
    asyncio.run(async_main())
    ~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/home/alex/pc2/lib/python3.13/site-packages/podman_compose.py", line 4252, in async_main
    await podman_compose.run()
  File "/home/alex/pc2/lib/python3.13/site-packages/podman_compose.py", line 2070, in run
    self._parse_compose_file()
    ~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/alex/pc2/lib/python3.13/site-packages/podman_compose.py", line 2326, in _parse_compose_file
    resolve_extends(services, [name for _, name in service_names], self.environ)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/alex/pc2/lib/python3.13/site-packages/podman_compose.py", line 1945, in resolve_extends
    del from_service["_deps"]
        ~~~~~~~~~~~~^^^^^^^^^
KeyError: '_deps'

with patch:

% pc build foo
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/podman_compose.py", line 1949, in resolve_extends
    del from_service["_deps"]
        ~~~~~~~~~~~~^^^^^^^^^
KeyError: '_deps'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/podman-compose", line 8, in <module>
    sys.exit(main())
             ~~~~^^
  File "/usr/lib/python3/dist-packages/podman_compose.py", line 4264, in main
    asyncio.run(async_main())
    ~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/usr/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/usr/lib/python3/dist-packages/podman_compose.py", line 4260, in async_main
    await podman_compose.run()
  File "/usr/lib/python3/dist-packages/podman_compose.py", line 2078, in run
    self._parse_compose_file()
    ~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib/python3/dist-packages/podman_compose.py", line 2334, in _parse_compose_file
    resolve_extends(services, [name for _, name in service_names], self.environ)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/podman_compose.py", line 1951, in resolve_extends
    raise KeyError(
        f"{from_service_name} not found at services.{name}.extends definition"
    )
KeyError: 'bar not found at services.foo.extends definition'