Pin publish test to 3.12 (#8951)

The bump to 3.13 broke the test

.github/workflows/ci.yml

@@ -1139,6 +1139,7 @@ jobs:
     env:
       # No dbus in GitHub Actions
       PYTHON_KEYRING_BACKEND: keyrings.alt.file.PlaintextKeyring
+      PYTHON_VERSION: 3.12
     permissions:
       # For trusted publishing
       id-token: write
@@ -1149,7 +1150,7 @@ jobs:
 
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.12"
+          python-version: "${{ env.PYTHON_VERSION }}"
 
       - name: "Download binary"
         uses: actions/download-artifact@v4
@@ -1169,7 +1170,7 @@ jobs:
 
       - name: "Publish test packages"
         # `-p 3.12` prefers the python we just installed over the one locked in `.python_version`.
-        run: ./uv run -p 3.12 scripts/publish/test_publish.py --uv ./uv all
+        run: ./uv run -p ${{ env.PYTHON_VERSION }} scripts/publish/test_publish.py --uv ./uv all
         env:
           RUST_LOG: uv=debug,uv_publish=trace
           UV_TEST_PUBLISH_TOKEN: ${{ secrets.UV_TEST_PUBLISH_TOKEN }}
@@ -1177,6 +1178,7 @@ jobs:
           UV_TEST_PUBLISH_GITLAB_PAT: ${{ secrets.UV_TEST_PUBLISH_GITLAB_PAT }}
           UV_TEST_PUBLISH_CODEBERG_TOKEN: ${{ secrets.UV_TEST_PUBLISH_CODEBERG_TOKEN }}
           UV_TEST_PUBLISH_CLOUDSMITH_TOKEN: ${{ secrets.UV_TEST_PUBLISH_CLOUDSMITH_TOKEN }}
+          UV_TEST_PUBLISH_PYTHON_VERSION: ${{ env.PYTHON_VERSION }}
 
   cache-test-ubuntu:
     timeout-minutes: 10

scripts/publish/test_publish.py

@@ -69,6 +69,7 @@ from packaging.utils import (
 from packaging.version import Version
 
 TEST_PYPI_PUBLISH_URL = "https://test.pypi.org/legacy/"
+PYTHON_VERSION = os.environ.get("UV_TEST_PUBLISH_PYTHON_VERSION", "3.12")
 
 cwd = Path(__file__).parent
 
@@ -124,8 +125,8 @@ all_targets: dict[str, TargetConfiguration] = local_targets | {
 }
 
 
-def get_new_version(project_name: str, client: httpx.Client) -> Version:
-    """Return the next free patch version on all indexes of the package."""
+def get_latest_version(project_name: str, client: httpx.Client) -> Version:
+    """Return the latest version on all indexes of the package."""
     # To keep the number of packages small we reuse them across targets, so we have to
     # pick a version that doesn't exist on any target yet
     versions = set()
@@ -151,10 +152,12 @@ def get_new_version(project_name: str, client: httpx.Client) -> Version:
                 time.sleep(1)
         else:
             raise RuntimeError(f"Failed to fetch {url}") from error
-    max_version = max(versions)
+    return max(versions)
 
-    # Bump the path version to obtain an empty version
-    release = list(max_version.release)
+
+def get_new_version(latest_version: Version) -> Version:
+    """Bump the path version to obtain an empty version."""
+    release = list(latest_version.release)
     release[-1] += 1
     return Version(".".join(str(i) for i in release))
 
@@ -193,7 +196,10 @@ def build_project_at_version(
 
     if project_root.exists():
         rmtree(project_root)
-    check_call([uv, "init", "--lib", "--name", project_name, dir_name], cwd=cwd)
+    check_call(
+        [uv, "init", "-p", PYTHON_VERSION, "--lib", "--name", project_name, dir_name],
+        cwd=cwd,
+    )
     pyproject_toml = project_root.joinpath("pyproject.toml")
 
     # Set to an unclaimed version
@@ -217,7 +223,12 @@ def build_project_at_version(
     return project_root
 
 
-def wait_for_index(index_url: str, project_name: str, version: Version, uv: Path):
+def wait_for_index(
+    index_url: str,
+    project_name: str,
+    version: Version,
+    uv: Path,
+):
     """Check that the index URL was updated, wait up to 100s if necessary.
 
     Often enough the index takes a few seconds until the index is updated after an
@@ -231,6 +242,8 @@ def wait_for_index(index_url: str, project_name: str, version: Version, uv: Path
                 uv,
                 "pip",
                 "compile",
+                "-p",
+                PYTHON_VERSION,
                 "--index",
                 index_url,
                 "--quiet",
@@ -241,7 +254,7 @@ def wait_for_index(index_url: str, project_name: str, version: Version, uv: Path
                 "-",
             ],
             text=True,
-            input=project_name,
+            input=f"{project_name}",
         )
         if f"{project_name}=={version}" in output and output.count("--hash") == 2:
             break
@@ -265,7 +278,8 @@ def publish_project(target: str, uv: Path, client: httpx.Client):
     print(f"\nPublish {project_name} for {target}")
 
     # The distributions are build to the dist directory of the project.
-    version = get_new_version(project_name, client)
+    previous_version = get_latest_version(project_name, client)
+    version = get_new_version(previous_version)
     project_dir = build_project_at_version(project_name, version, uv)
 
     # Upload configuration