Display better messages on legacy repo HTTP errors

poetry/repositories/legacy_repository.py

@@ -27,6 +27,7 @@ from poetry.utils.patterns import wheel_file_re
 from ..inspection.info import PackageInfo
 from .auth import Auth
 from .exceptions import PackageNotFound
+from .exceptions import RepositoryError
 from .pypi_repository import PyPiRepository
 
 
@@ -361,8 +362,12 @@ class LegacyRepository(PyPiRepository):
 
     def _get(self, endpoint):  # type: (str) -> Union[Page, None]
         url = self._url + endpoint
-        response = self.session.get(url)
-        if response.status_code == 404:
-            return
+        try:
+            response = self.session.get(url)
+            if response.status_code == 404:
+                return
+            response.raise_for_status()
+        except requests.HTTPError as e:
+            raise RepositoryError(e)
 
         return Page(url, response.content, response.headers)

tests/repositories/test_legacy_repository.py

@@ -5,6 +5,7 @@ import pytest
 from poetry.core.packages import Dependency
 from poetry.repositories.auth import Auth
 from poetry.repositories.exceptions import PackageNotFound
+from poetry.repositories.exceptions import RepositoryError
 from poetry.repositories.legacy_repository import LegacyRepository
 from poetry.repositories.legacy_repository import Page
 from poetry.utils._compat import PY35
@@ -278,3 +279,36 @@ def test_username_password_special_chars():
     repo = MockRepository(auth=auth)
 
     assert "http://user%3A:%2F%252Fp%40ssword@legacy.foo.bar" == repo.authenticated_url
+
+
+class MockHttpRepository(LegacyRepository):
+    def __init__(self, endpoint_responses, http):
+        base_url = "http://legacy.foo.bar"
+        super(MockHttpRepository, self).__init__(
+            "legacy", url=base_url, auth=None, disable_cache=True
+        )
+
+        for endpoint, response in endpoint_responses.items():
+            url = base_url + endpoint
+            http.register_uri(http.GET, url, status=response)
+
+
+def test_get_200_returns_page(http):
+    repo = MockHttpRepository({"/foo": 200}, http)
+
+    assert repo._get("/foo")
+
+
+def test_get_404_returns_none(http):
+    repo = MockHttpRepository({"/foo": 404}, http)
+
+    assert repo._get("/foo") is None
+
+
+def test_get_4xx_and_5xx_raises(http):
+    endpoints = {"/{}".format(code): code for code in {401, 403, 500}}
+    repo = MockHttpRepository(endpoints, http)
+
+    for endpoint in endpoints:
+        with pytest.raises(RepositoryError):
+            repo._get(endpoint)