drop python 3.8 and support 3.12

noxfile.py

@@ -9,7 +9,7 @@
 locations = "src", "tests"
 
 
-@nox.session(python=["3.8", "3.9", "3.10", "3.11"])
+@nox.session(python=["3.9", "3.10", "3.11", "3.12"])
 def tests(session: nox.Session) -> None:
     session.install(".[tests]")
     session.run(

pyproject.toml

@@ -12,13 +12,13 @@ license = {text = "Apache-2.0"}
 authors = [{ name = "Iterative", email = "[email protected]" }]
 classifiers = [
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "Development Status :: 4 - Beta",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dynamic = ["version"]
 dependencies = [
     "gitpython>3",

src/scmrepo/asyn.py

@@ -2,7 +2,7 @@
 import asyncio
 import os
 import threading
-from typing import Any, List, Optional
+from typing import Any, Optional
 
 from fsspec.asyn import (  # noqa: F401, pylint:disable=unused-import
     _selector_policy,
@@ -11,9 +11,9 @@
 )
 
 # dedicated async IO thread
-iothread: List[Optional[threading.Thread]] = [None]
+iothread: list[Optional[threading.Thread]] = [None]
 # global DVC event loop
-default_loop: List[Optional[asyncio.AbstractEventLoop]] = [None]
+default_loop: list[Optional[asyncio.AbstractEventLoop]] = [None]
 lock = threading.Lock()
 
 

src/scmrepo/fs.py

@@ -1,7 +1,7 @@
 import errno
 import os
 import posixpath
-from typing import TYPE_CHECKING, Any, BinaryIO, Callable, Dict, Optional, Tuple
+from typing import TYPE_CHECKING, Any, BinaryIO, Callable, Optional
 
 from fsspec.callbacks import _DEFAULT_CALLBACK
 from fsspec.spec import AbstractFileSystem
@@ -169,7 +169,7 @@ def relparts(self, path, start=None):
     def as_posix(cls, path):
         return path
 
-    def _get_key(self, path: str) -> Tuple[str, ...]:
+    def _get_key(self, path: str) -> tuple[str, ...]:
         path = self.abspath(path)
         if path == self.root_marker:
             return ()
@@ -184,7 +184,7 @@ def _open(
         mode: str = "rb",
         block_size: Optional[int] = None,
         autocommit: bool = True,
-        cache_options: Optional[Dict] = None,
+        cache_options: Optional[dict] = None,
         raw: bool = False,
         **kwargs: Any,
     ) -> BinaryIO:
@@ -204,7 +204,7 @@ def _open(
                 errno.EISDIR, os.strerror(errno.EISDIR), path
             ) from exc
 
-    def info(self, path: str, **kwargs: Any) -> Dict[str, Any]:
+    def info(self, path: str, **kwargs: Any) -> dict[str, Any]:
         key = self._get_key(path)
         try:
             # NOTE: to avoid wasting time computing object size, trie.info

src/scmrepo/git/__init__.py

@@ -5,18 +5,14 @@
 import re
 import typing
 from collections import OrderedDict
-from collections.abc import Mapping
+from collections.abc import Iterable, Mapping
 from contextlib import contextmanager
 from functools import partialmethod
 from typing import (
     TYPE_CHECKING,
     Callable,
     ClassVar,
-    Dict,
-    Iterable,
     Optional,
-    Tuple,
-    Type,
     Union,
 )
 
@@ -44,14 +40,14 @@
 
 logger = logging.getLogger(__name__)
 
-BackendCls = Type[BaseGitBackend]
+BackendCls = type[BaseGitBackend]
 
 
 _LOW_PRIO_BACKENDS = ("gitpython",)
 
 
 class GitBackends(Mapping):
-    DEFAULT: ClassVar[Dict[str, BackendCls]] = {
+    DEFAULT: ClassVar[dict[str, BackendCls]] = {
         "dulwich": DulwichBackend,
         "pygit2": Pygit2Backend,
         "gitpython": GitPythonBackend,
@@ -72,7 +68,7 @@ def __init__(self, selected: Optional[Iterable[str]], *args, **kwargs) -> None:
         selected = selected or list(self.DEFAULT)
         self.backends = OrderedDict((key, self.DEFAULT[key]) for key in selected)
 
-        self.initialized: Dict[str, BaseGitBackend] = {}
+        self.initialized: dict[str, BaseGitBackend] = {}
 
         self.args = args
         self.kwargs = kwargs
@@ -169,7 +165,7 @@ def is_sha(cls, rev):
         return rev and cls.RE_HEXSHA.search(rev)
 
     @classmethod
-    def split_ref_pattern(cls, ref: str) -> Tuple[str, str]:
+    def split_ref_pattern(cls, ref: str) -> tuple[str, str]:
         name = cls.BAD_REF_CHARS_RE.split(ref, maxsplit=1)[0]
         return name, ref[len(name) :]
 
@@ -492,8 +488,8 @@ def describe(
         base: Optional[str] = None,
         match: Optional[str] = None,
         exclude: Optional[str] = None,
-    ) -> Dict[str, Optional[str]]:
-        results: Dict[str, Optional[str]] = {}
+    ) -> dict[str, Optional[str]]:
+        results: dict[str, Optional[str]] = {}
         remained_revs = set()
         if base == "refs/heads":
             current_rev = self.get_rev()

src/scmrepo/git/backend/base.py

@@ -1,7 +1,8 @@
 import os
 from abc import ABC, abstractmethod
+from collections.abc import Iterable, Mapping
 from enum import Enum
-from typing import TYPE_CHECKING, Callable, Iterable, Mapping, Optional, Tuple, Union
+from typing import TYPE_CHECKING, Callable, Optional, Union
 
 from scmrepo.exceptions import SCMError
 from scmrepo.git.objects import GitObject
@@ -281,7 +282,7 @@ def _stash_push(
         ref: str,
         message: Optional[str] = None,
         include_untracked: bool = False,
-    ) -> Tuple[Optional[str], bool]:
+    ) -> tuple[Optional[str], bool]:
         """Push a commit onto the specified stash.
 
         Returns a tuple of the form (rev, need_reset) where need_reset
@@ -347,7 +348,7 @@ def checkout_index(
     @abstractmethod
     def status(
         self, ignored: bool = False, untracked_files: str = "all"
-    ) -> Tuple[Mapping[str, Iterable[str]], Iterable[str], Iterable[str]]:
+    ) -> tuple[Mapping[str, Iterable[str]], Iterable[str], Iterable[str]]:
         """Return tuple of (staged_files, unstaged_files, untracked_files).
 
         staged_files will be a dict mapping status (add, delete, modify) to a

src/scmrepo/git/backend/dulwich/__init__.py

@@ -4,20 +4,15 @@
 import os
 import re
 import stat
+from collections.abc import Iterable, Iterator, Mapping
 from contextlib import closing
 from functools import partial
 from io import BytesIO, StringIO
 from typing import (
     TYPE_CHECKING,
     Any,
     Callable,
-    Dict,
-    Iterable,
-    Iterator,
-    List,
-    Mapping,
     Optional,
-    Tuple,
     Union,
 )
 
@@ -151,18 +146,18 @@ def encoding(self) -> str:
             return self._config.encoding
         return self._config.backends[0].encoding
 
-    def get(self, section: Tuple[str, ...], name: str) -> str:
+    def get(self, section: tuple[str, ...], name: str) -> str:
         """Return the specified setting as a string."""
         return self._config.get(section, name).decode(self.encoding)
 
-    def get_bool(self, section: Tuple[str, ...], name: str) -> bool:
+    def get_bool(self, section: tuple[str, ...], name: str) -> bool:
         """Return the specified setting as a boolean."""
         value = self._config.get_boolean(section, name)
         if value is None:
             raise ValueError("setting is not a valid boolean")
         return value
 
-    def get_multivar(self, section: Tuple[str, ...], name: str) -> Iterator[str]:
+    def get_multivar(self, section: tuple[str, ...], name: str) -> Iterator[str]:
         """Iterate over string values in the specified multivar setting."""
         for value in self._config.get_multivar(section, name):
             yield value.decode(self.encoding)
@@ -199,17 +194,17 @@ def __init__(  # pylint:disable=W0231
         except NotGitRepository as exc:
             raise SCMError(f"{root_dir} is not a git repository") from exc
 
-        self._submodules: Dict[str, str] = self._find_submodules()
+        self._submodules: dict[str, str] = self._find_submodules()
         self._stashes: dict = {}
 
-    def _find_submodules(self) -> Dict[str, str]:
+    def _find_submodules(self) -> dict[str, str]:
         """Return dict mapping submodule names to submodule paths.
 
         Submodule paths will be relative to Git repo root.
         """
         from dulwich.config import ConfigFile, parse_submodules
 
-        submodules: Dict[str, str] = {}
+        submodules: dict[str, str] = {}
         config_path = os.path.join(self.root_dir, ".gitmodules")
         if os.path.isfile(config_path):
             config = ConfigFile.from_path(config_path)
@@ -332,7 +327,7 @@ def add(
             self.repo.stage(list(self.repo.open_index()))
             return
 
-        files: List[bytes] = [
+        files: list[bytes] = [
             os.fsencode(fpath) for fpath in self._expand_paths(paths, force=force)
         ]
         if update:
@@ -348,7 +343,7 @@ def add(
         else:
             self.repo.stage(files)
 
-    def _expand_paths(self, paths: List[str], force: bool = False) -> Iterator[str]:
+    def _expand_paths(self, paths: list[str], force: bool = False) -> Iterator[str]:
         for path in paths:
             if not os.path.isabs(path) and self._submodules:
                 # NOTE: If path is inside a submodule, Dulwich expects the
@@ -459,7 +454,7 @@ def is_tracked(self, path: str) -> bool:
         return any(p == rel or p.startswith(rel_dir) for p in self.repo.open_index())
 
     def is_dirty(self, untracked_files: bool = False) -> bool:
-        kwargs: Dict[str, Any] = {} if untracked_files else {"untracked_files": "no"}
+        kwargs: dict[str, Any] = {} if untracked_files else {"untracked_files": "no"}
         return any(self.status(**kwargs))
 
     def active_branch(self) -> str:
@@ -707,9 +702,9 @@ def fetch_refspecs(
         fetch_refs = []
 
         def determine_wants(
-            remote_refs: Dict[bytes, bytes],
+            remote_refs: dict[bytes, bytes],
             depth: Optional[int] = None,  # pylint: disable=unused-argument
-        ) -> List[bytes]:
+        ) -> list[bytes]:
             fetch_refs.extend(
                 parse_reftuples(
                     DictRefsContainer(remote_refs),
@@ -782,7 +777,7 @@ def _stash_push(
         ref: str,
         message: Optional[str] = None,
         include_untracked: bool = False,
-    ) -> Tuple[Optional[str], bool]:
+    ) -> tuple[Optional[str], bool]:
         from dulwich.repo import InvalidUserIdentity
 
         from scmrepo.git import Stash
@@ -836,8 +831,8 @@ def _describe(
     ) -> Mapping[str, Optional[str]]:
         if not base:
             base = "refs/tags"
-        rev_mapping: Dict[str, Optional[str]] = {}
-        results: Dict[str, Optional[str]] = {}
+        rev_mapping: dict[str, Optional[str]] = {}
+        results: dict[str, Optional[str]] = {}
         for ref in self.iter_refs(base=base):
             if (match and not fnmatch.fnmatch(ref, match)) or (
                 exclude and fnmatch.fnmatch(ref, exclude)
@@ -877,7 +872,7 @@ def checkout_index(
 
     def status(
         self, ignored: bool = False, untracked_files: str = "all"
-    ) -> Tuple[Mapping[str, Iterable[str]], Iterable[str], Iterable[str]]:
+    ) -> tuple[Mapping[str, Iterable[str]], Iterable[str], Iterable[str]]:
         from dulwich.porcelain import Error
         from dulwich.porcelain import status as git_status
 
@@ -978,7 +973,7 @@ def check_attr(
 _IDENTITY_RE = re.compile(r"(?P<name>.+)\s+<(?P<email>.+)>")
 
 
-def _parse_identity(identity: str) -> Tuple[str, str]:
+def _parse_identity(identity: str) -> tuple[str, str]:
     m = _IDENTITY_RE.match(identity)
     if not m:
         raise SCMError("Could not parse tagger identity '{identity}'")

src/scmrepo/git/backend/dulwich/asyncssh_vendor.py

@@ -1,15 +1,11 @@
 """asyncssh SSH vendor for Dulwich."""
 import asyncio
 import os
+from collections.abc import Coroutine, Iterator, Sequence
 from typing import (
     TYPE_CHECKING,
     Callable,
-    Coroutine,
-    Dict,
-    Iterator,
-    List,
     Optional,
-    Sequence,
     cast,
 )
 
@@ -47,7 +43,7 @@ def __init__(self, stderr: "SSHReader", loop: asyncio.AbstractEventLoop) -> None
         self.stderr = stderr
         self.loop = loop
 
-    async def _readlines(self) -> List[bytes]:
+    async def _readlines(self) -> list[bytes]:
         lines = []
         while True:
             line = await self.stderr.readline()
@@ -140,12 +136,12 @@ def _process_public_key_ok_gh(self, _pkttype, _pktid, packet):
 
 class InteractiveSSHClient(SSHClient):
     _conn: Optional["SSHClientConnection"] = None
-    _keys_to_try: Optional[List["FilePath"]] = None
-    _passphrases: Dict[str, str]
+    _keys_to_try: Optional[list["FilePath"]] = None
+    _passphrases: dict[str, str]
 
     def __init__(self, *args, **kwargs):
         super(*args, **kwargs)
-        _passphrases: Dict[str, str] = {}
+        _passphrases: dict[str, str] = {}
 
     def connection_made(self, conn: "SSHClientConnection") -> None:
         self._conn = conn
@@ -267,7 +263,7 @@ def __init__(self, **kwargs) -> None:
     async def _run_command(
         self,
         host: str,
-        command: List[str],
+        command: list[str],
         username: Optional[str] = None,
         port: Optional[int] = None,
         password: Optional[str] = None,

src/scmrepo/git/backend/dulwich/client.py

@@ -1,4 +1,5 @@
-from typing import Dict, Iterator, List, Optional, Union
+from collections.abc import Iterator
+from typing import Optional, Union
 
 from dulwich.client import HTTPUnauthorized, Urllib3HttpGitClient
 
@@ -26,10 +27,10 @@ def __init__(
     def _http_request(
         self,
         url: str,
-        headers: Optional[Dict[str, str]] = None,
+        headers: Optional[dict[str, str]] = None,
         data: Optional[Union[bytes, Iterator[bytes]]] = None,
     ):
-        cached_chunks: List[bytes] = []
+        cached_chunks: list[bytes] = []
 
         def _cached_data() -> Iterator[bytes]:
             assert data is not None
@@ -64,7 +65,7 @@ def _cached_data() -> Iterator[bytes]:
             self._store_credentials.approve()
         return result
 
-    def _get_auth(self) -> Dict[str, str]:
+    def _get_auth(self) -> dict[str, str]:
         from urllib3.util import make_headers
 
         try: