Replace versioneer with setuptools-scm (#9137)

Author: jacobtomlinson

.flake8

@@ -5,7 +5,7 @@
 # https://flake8.readthedocs.io/en/latest/user/error-codes.html
 
 # Note: there cannot be spaces after commas here
-exclude = __init__.py,versioneer.py,distributed/_concurrent_futures_thread.py
+exclude = __init__.py,distributed/_concurrent_futures_thread.py
 ignore =
     # Ignores below are aligned with black https://github.com/psf/black/blob/main/.flake8
     # Whitespace before ':'

.gitignore

@@ -5,13 +5,11 @@
 # Cython files
 *.c
 *.so
-distributed/scheduler.html
 
 build/
 dist/
 *.egg-info
 docs/build
-continuous_integration/hdfs-initialized
 .DS_Store
 .cache
 .coverage
@@ -32,6 +30,12 @@ tags
 .venv/
 .mypy_cache/
 
+# Project specific
+continuous_integration/hdfs-initialized
+distributed/scheduler.html
+distributed/_version.py
+
+# Test reports
 reports/
 test_report*.html
 test_report*.db

continuous_integration/recipes/distributed/meta.yaml

@@ -27,8 +27,8 @@ requirements:
     - python >=3.10
     - pip
     - dask-core {{ dask_version }}
-    - versioneer =0.29
-    - setuptools >=62.6
+    - setuptools-scm
+    - setuptools >=80
     - tomli # [py<311]
   run:
     - python >=3.10

distributed/__init__.py

@@ -19,7 +19,6 @@
 import dask
 from dask.config import config  # type: ignore
 
-from distributed._version import get_versions
 from distributed.actor import Actor, ActorFuture, BaseActorFuture
 from distributed.client import (
     Client,
@@ -77,23 +76,13 @@
 )
 from distributed.worker_client import local_client, worker_client
 
-
-def __getattr__(name):
-    global __version__, __git_revision__
-
-    if name == "__version__":
-        from importlib.metadata import version
-
-        __version__ = version("distributed")
-        return __version__
-
-    if name == "__git_revision__":
-        from distributed._version import get_versions
-
-        __git_revision__ = get_versions()["full-revisionid"]
-        return __git_revision__
-
-    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
+try:
+    # Backwards compatibility with versioneer
+    from distributed._version import __commit_id__ as __git_revision__
+    from distributed._version import __version__
+except ImportError:
+    __git_revision__ = "unknown"
+    __version__ = "unknown"
 
 
 __all__ = [
@@ -142,7 +131,6 @@ def __getattr__(name):
     "get_client",
     "get_task_metadata",
     "get_task_stream",
-    "get_versions",
     "get_worker",
     "local_client",
     "performance_report",