sources: allow to configure the priority of PyPI

Add a warning that PyPI will be disabled automatically in a future version of Poetry if there is at least one custom source with another priority than `explicit` configured and that it should be configured explicitly with a certain priority for forward compatibility.

docs/cli.md

@@ -779,9 +779,12 @@ For example, to add the `pypi-test` source, you can run:
 poetry source add pypi-test https://test.pypi.org/simple/
 ```
 
-{{% note %}}
-You cannot use the name `pypi` as it is reserved for use by the default PyPI source.
-{{% /note %}}
+You cannot use the name `pypi` for a custom repository as it is reserved for use by
+the default PyPI source. However, you can set the priority of PyPI:
+
+```bash
+poetry source add --priority=explicit pypi
+```
 
 #### Options
 
@@ -808,7 +811,8 @@ poetry source show pypi-test
 ```
 
 {{% note %}}
-This command will only show sources configured via the `pyproject.toml` and does not include PyPI.
+This command will only show sources configured via the `pyproject.toml`
+and does not include the implicit default PyPI.
 {{% /note %}}
 
 ### source remove

docs/repositories.md

@@ -128,7 +128,7 @@ If `priority` is undefined, the source is considered a primary source that takes
 Package sources are considered in the following order:
 1. [default source](#default-package-source),
 2. primary sources,
-3. PyPI (unless disabled by another default source),
+3. implicit PyPI (unless disabled by another [default source](#default-package-source) or configured explicitly),
 4. [secondary sources](#secondary-package-sources),
 
 [Explicit sources](#explicit-package-sources) are considered only for packages that explicitly [indicate their source](#package-source-constraint).
@@ -137,19 +137,17 @@ Within each priority class, package sources are considered in order of appearanc
 
 {{% note %}}
 
-If you prefer to disable [PyPI](https://pypi.org) completely, you may choose to set one of your package sources to be the [default](#default-package-source).
+If you want to change the priority of [PyPI](https://pypi.org), you can set it explicitly, e.g.
 
-If you prefer to specify a package source for a specific dependency, see [Secondary Package Sources](#secondary-package-sources).
-
-{{% /note %}}
-
-
-{{% warning %}}
+```bash
+poetry source add --priority=primary PyPI
+```
 
-If you do not want any of the custom sources to take precedence over [PyPI](https://pypi.org),
-you must declare **all** package sources to be [secondary](#secondary-package-sources).
+If you prefer to disable PyPI completely,
+you may choose to set one of your package sources to be the [default](#default-package-source)
+or configure PyPI as [explicit source](#explicit-package-sources).
 
-{{% /warning %}}
+{{% /note %}}
 
 
 #### Default Package Source
@@ -164,6 +162,21 @@ poetry source add --priority=default foo https://foo.bar/simple/
 
 {{% warning %}}
 
+In a future version of Poetry, PyPI will be disabled automatically
+if there is at least one custom source configured with another priority than `explicit`.
+If you are using custom sources in addition to PyPI, you should configure PyPI explicitly
+with a certain priority, e.g.
+
+```bash
+poetry source add --priority=primary PyPI
+```
+
+This way, the priority of PyPI can be set in a fine-granular way.
+
+{{% /warning %}}
+
+{{% warning %}}
+
 Configuring a custom package source as default, will effectively disable [PyPI](https://pypi.org)
 as a package source for your project.
 

src/poetry/config/source.py

@@ -9,7 +9,7 @@
 @dataclasses.dataclass(order=True, eq=True)
 class Source:
     name: str
-    url: str
+    url: str = ""
     default: dataclasses.InitVar[bool] = False
     secondary: dataclasses.InitVar[bool] = False
     priority: Priority = (
@@ -38,6 +38,8 @@ def to_dict(self) -> dict[str, str | bool]:
         return dataclasses.asdict(
             self,
             dict_factory=lambda x: {
-                k: v if not isinstance(v, Priority) else v.name.lower() for (k, v) in x
+                k: v if not isinstance(v, Priority) else v.name.lower()
+                for (k, v) in x
+                if v
             },
         )

src/poetry/console/commands/source/add.py

@@ -19,7 +19,14 @@ class SourceAddCommand(Command):
             "name",
             "Source repository name.",
         ),
-        argument("url", "Source repository url."),
+        argument(
+            "url",
+            (
+                "Source repository URL."
+                " Required, except for PyPI, for which it is not allowed."
+            ),
+            optional=True,
+        ),
     ]
 
     options = [
@@ -57,10 +64,24 @@ def handle(self) -> int:
         from poetry.utils.source import source_to_table
 
         name: str = self.argument("name")
+        lower_name = name.lower()
         url: str = self.argument("url")
         is_default: bool = self.option("default", False)
         is_secondary: bool = self.option("secondary", False)
-        priority: Priority | None = self.option("priority", None)
+        priority_str: str | None = self.option("priority", None)
+
+        if lower_name == "pypi":
+            name = "PyPI"
+            if url:
+                self.line_error(
+                    "<error>The URL of PyPI is fixed and cannot be set.</error>"
+                )
+                return 1
+        elif not url:
+            self.line_error(
+                "<error>A custom source cannot be added without a URL.</error>"
+            )
+            return 1
 
         if is_default and is_secondary:
             self.line_error(
@@ -70,7 +91,7 @@ def handle(self) -> int:
             return 1
 
         if is_default or is_secondary:
-            if priority is not None:
+            if priority_str is not None:
                 self.line_error(
                     "<error>Priority was passed through both --priority and a"
                     " deprecated flag (--default or --secondary). Please only provide"
@@ -88,34 +109,25 @@ def handle(self) -> int:
             priority = Priority.DEFAULT
         elif is_secondary:
             priority = Priority.SECONDARY
-        elif priority is None:
+        elif priority_str is None:
             priority = Priority.PRIMARY
-
-        new_source = Source(name=name, url=url, priority=priority)
-        existing_sources = self.poetry.get_sources()
+        else:
+            priority = Priority[priority_str.upper()]
 
         sources = AoT([])
-
+        new_source = Source(name=name, url=url, priority=priority)
         is_new_source = True
-        for source in existing_sources:
-            if source == new_source:
-                self.line(
-                    f"Source with name <c1>{name}</c1> already exists. Skipping"
-                    " addition."
-                )
-                return 0
-            elif (
-                source.priority is Priority.DEFAULT
-                and new_source.priority is Priority.DEFAULT
-            ):
+
+        for source in self.poetry.get_sources():
+            if source.priority is Priority.DEFAULT and priority is Priority.DEFAULT:
                 self.line_error(
                     f"<error>Source with name <c1>{source.name}</c1> is already set to"
                     " default. Only one default source can be configured at a"
                     " time.</error>"
                 )
                 return 1
 
-            if source.name == name:
+            if source.name.lower() == lower_name:
                 source = new_source
                 is_new_source = False
 

src/poetry/console/commands/source/remove.py

@@ -21,12 +21,13 @@ def handle(self) -> int:
         from poetry.utils.source import source_to_table
 
         name = self.argument("name")
+        lower_name = name.lower()
 
         sources = AoT([])
         removed = False
 
         for source in self.poetry.get_sources():
-            if source.name == name:
+            if source.name.lower() == lower_name:
                 self.line(f"Removing source with name <c1>{source.name}</c1>.")
                 removed = True
                 continue

src/poetry/console/commands/source/show.py

@@ -27,31 +27,28 @@ class SourceShowCommand(Command):
     def handle(self) -> int:
         sources = self.poetry.get_sources()
         names = self.argument("source")
+        lower_names = [name.lower() for name in names]
 
         if not sources:
             self.line("No sources configured for this project.")
             return 0
 
-        if names and not any(s.name in names for s in sources):
+        if names and not any(s.name.lower() in lower_names for s in sources):
             self.line_error(
                 f"No source found with name(s): {', '.join(names)}",
                 style="error",
             )
             return 1
 
         for source in sources:
-            if names and source.name not in names:
+            if names and source.name.lower() not in lower_names:
                 continue
 
             table = self.table(style="compact")
-            rows: Rows = [
-                ["<info>name</>", f" : <c1>{source.name}</>"],
-                ["<info>url</>", f" : {source.url}"],
-                [
-                    "<info>priority</>",
-                    f" : {source.priority.name.lower()}",
-                ],
-            ]
+            rows: Rows = [["<info>name</>", f" : <c1>{source.name}</>"]]
+            if source.url:
+                rows.append(["<info>url</>", f" : {source.url}"])
+            rows.append(["<info>priority</>", f" : {source.priority.name.lower()}"])
             table.add_rows(rows)
             table.render()
             self.line("")

src/poetry/factory.py

@@ -15,6 +15,7 @@
 from poetry.core.packages.project_package import ProjectPackage
 
 from poetry.config.config import Config
+from poetry.exceptions import PoetryException
 from poetry.json import validate_object
 from poetry.packages.locker import Locker
 from poetry.plugins.plugin import Plugin
@@ -32,7 +33,7 @@
     from tomlkit.toml_document import TOMLDocument
 
     from poetry.repositories import RepositoryPool
-    from poetry.repositories.legacy_repository import LegacyRepository
+    from poetry.repositories.http_repository import HTTPRepository
     from poetry.utils.dependency_specification import DependencySpec
 
 logger = logging.getLogger(__name__)
@@ -134,6 +135,7 @@ def create_pool(
 
         pool = RepositoryPool()
 
+        explicit_pypi = False
         for source in sources:
             repository = cls.create_package_source(
                 source, auth_config, disable_cache=disable_cache
@@ -163,40 +165,71 @@ def create_pool(
                 io.write_line(message)
 
             pool.add_repository(repository, priority=priority)
+            if repository.name.lower() == "pypi":
+                explicit_pypi = True
 
         # Only add PyPI if no default repository is configured
-        if pool.has_default():
-            if io.is_debug():
-                io.write_line("Deactivating the PyPI repository")
-        else:
-            from poetry.repositories.pypi_repository import PyPiRepository
-
-            if pool.has_primary_repositories():
-                pypi_priority = Priority.SECONDARY
+        if not explicit_pypi:
+            if pool.has_default():
+                if io.is_debug():
+                    io.write_line("Deactivating the PyPI repository")
             else:
-                pypi_priority = Priority.DEFAULT
+                from poetry.repositories.pypi_repository import PyPiRepository
+
+                if pool.repositories:
+                    io.write_error_line(
+                        "<warning>"
+                        "Warning: In a future version of Poetry, PyPI will be disabled"
+                        " automatically if at least one custom source is configured"
+                        " with another priority than 'explicit'. In order to avoid"
+                        " a breaking change and make your pyproject.toml forward"
+                        " compatible, add PyPI explicitly via 'poetry source add pypi'."
+                        " By the way, this has the advantage that you can set the"
+                        " priority of PyPI as with any other source."
+                        "</warning>"
+                    )
+
+                if pool.has_primary_repositories():
+                    pypi_priority = Priority.SECONDARY
+                else:
+                    pypi_priority = Priority.DEFAULT
 
-            pool.add_repository(
-                PyPiRepository(disable_cache=disable_cache), priority=pypi_priority
+                pool.add_repository(
+                    PyPiRepository(disable_cache=disable_cache), priority=pypi_priority
+                )
+
+        if not pool.repositories:
+            raise PoetryException(
+                "At least one source must not be configured as 'explicit'."
             )
 
         return pool
 
     @classmethod
     def create_package_source(
         cls, source: dict[str, str], auth_config: Config, disable_cache: bool = False
-    ) -> LegacyRepository:
+    ) -> HTTPRepository:
+        from poetry.repositories.exceptions import InvalidSourceError
         from poetry.repositories.legacy_repository import LegacyRepository
+        from poetry.repositories.pypi_repository import PyPiRepository
         from poetry.repositories.single_page_repository import SinglePageRepository
 
-        if "url" not in source:
-            raise RuntimeError("Unsupported source specified")
+        try:
+            name = source["name"]
+        except KeyError:
+            raise InvalidSourceError("Missing [name] in source.")
+
+        if name.lower() == "pypi":
+            if "url" in source:
+                raise InvalidSourceError(
+                    "The PyPI repository cannot be configured with a custom url."
+                )
+            return PyPiRepository(disable_cache=disable_cache)
 
-        # PyPI-like repository
-        if "name" not in source:
-            raise RuntimeError("Missing [name] in source.")
-        name = source["name"]
-        url = source["url"]
+        try:
+            url = source["url"]
+        except KeyError:
+            raise InvalidSourceError(f"Missing [url] in source {name!r}.")
 
         repository_class = LegacyRepository
 

src/poetry/json/schemas/poetry.json

@@ -20,8 +20,7 @@
       "type": "object",
       "additionalProperties": false,
       "required": [
-        "name",
-        "url"
+        "name"
       ],
       "properties": {
         "name": {

src/poetry/repositories/exceptions.py

@@ -7,3 +7,7 @@ class RepositoryError(Exception):
 
 class PackageNotFound(Exception):
     pass
+
+
+class InvalidSourceError(Exception):
+    pass