fix: report network errors for gh: specs instead of a traceback

src/repo_review/__main__.py

@@ -304,6 +304,10 @@ def _remote_path_processor(package: str) -> Path | GHPath:
         rich.print(f"[red][bold]Error[/bold] accessing {e.url}", file=sys.stderr)
         rich.print(f"[red]{e}", file=sys.stderr)
         raise SystemExit(1) from None
+    except urllib.error.URLError as e:
+        rich.print(f"[red][bold]Error[/bold] accessing {package}", file=sys.stderr)
+        rich.print(f"[red]{e.reason}", file=sys.stderr)
+        raise SystemExit(1) from None
 
 
 def main(args: list[str] | None = None) -> None:

tests/test_remote_path.py

@@ -1,4 +1,5 @@
 import json
+import urllib.error
 from pathlib import Path
 
 import pytest
@@ -55,3 +56,18 @@ def spy(package: object) -> object:
 
     assert seen == ["gh:org/repo@main:src/pkg"]
     assert isinstance(seen[0], str)
+
+
+def test_remote_path_offline(
+    monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
+) -> None:
+    def fake_open(url: str) -> str:  # noqa: ARG001
+        msg = "Name or service not known"
+        raise urllib.error.URLError(msg)
+
+    monkeypatch.setattr(GHPath, "open_url", staticmethod(fake_open))
+    with pytest.raises(SystemExit) as excinfo:
+        _remote_path_processor("gh:org/repo")
+
+    assert excinfo.value.code == 1
+    assert "Name or service not known" in capsys.readouterr().err