Move code backported from cpython upstream to backport.py

diff --git a/mkosi/backport.py b/mkosi/backport.py
new file mode 100644 (file)
index 0000000..4b0902e
--- /dev/null
+++ b/mkosi/backport.py
@@ -0,0 +1,97 @@
+# SPDX-License-Identifier: PSF-2.0
+# Copied from https://github.com/python/cpython/blob/main/Lib/importlib/resources/_common.py
+
+# We backport as_file() from python 3.12 here temporarily since it added directory support.
+# TODO: Remove once minimum python version is 3.12.
+
+import contextlib
+import functools
+import os
+import tempfile
+from pathlib import Path
+from typing import no_type_check
+
+
+@no_type_check
+@contextlib.contextmanager
+def _tempfile(
+    reader,
+    suffix='',
+    # gh-93353: Keep a reference to call os.remove() in late Python
+    # finalization.
+    *,
+    _os_remove=os.remove,
+):
+    # Not using tempfile.NamedTemporaryFile as it leads to deeper 'try'
+    # blocks due to the need to close the temporary file to work on Windows
+    # properly.
+    fd, raw_path = tempfile.mkstemp(suffix=suffix)
+    try:
+        try:
+            os.write(fd, reader())
+        finally:
+            os.close(fd)
+        del reader
+        yield Path(raw_path)
+    finally:
+        try:
+            _os_remove(raw_path)
+        except FileNotFoundError:
+            pass
+
+@no_type_check
+def _temp_file(path):
+    return _tempfile(path.read_bytes, suffix=path.name)
+
+@no_type_check
+def _is_present_dir(path) -> bool:
+    """
+    Some Traversables implement ``is_dir()`` to raise an
+    exception (i.e. ``FileNotFoundError``) when the
+    directory doesn't exist. This function wraps that call
+    to always return a boolean and only return True
+    if there's a dir and it exists.
+    """
+    with contextlib.suppress(FileNotFoundError):
+        return path.is_dir()
+    return False
+
+@no_type_check
+@functools.singledispatch
+def as_file(path):
+    """
+    Given a Traversable object, return that object as a
+    path on the local file system in a context manager.
+    """
+    return _temp_dir(path) if _is_present_dir(path) else _temp_file(path)
+
+@no_type_check
+@contextlib.contextmanager
+def _temp_path(dir: tempfile.TemporaryDirectory):
+    """
+    Wrap tempfile.TemporyDirectory to return a pathlib object.
+    """
+    with dir as result:
+        yield Path(result)
+
+@no_type_check
+@contextlib.contextmanager
+def _temp_dir(path):
+    """
+    Given a traversable dir, recursively replicate the whole tree
+    to the file system in a context manager.
+    """
+    assert path.is_dir()
+    with _temp_path(tempfile.TemporaryDirectory()) as temp_dir:
+        yield _write_contents(temp_dir, path)
+
+@no_type_check
+def _write_contents(target, source):
+    child = target.joinpath(source.name)
+    if source.is_dir():
+        child.mkdir()
+        for item in source.iterdir():
+            _write_contents(child, item)
+    else:
+        child.write_bytes(source.read_bytes())
+    return child

diff --git a/mkosi/util.py b/mkosi/util.py
index b66b7b8422535eaba01dfd0f8fd53313cac193a1..e55b54d3bc594f4aa03b19a8b8f0b8899362c06c 100644 (file)
--- a/mkosi/util.py
+++ b/mkosi/util.py
@@ -20,8 +20,9 @@ import tempfile
 from collections.abc import Hashable, Iterable, Iterator, Mapping, Sequence
 from pathlib import Path
 from types import ModuleType
-from typing import Any, Callable, Optional, TypeVar, no_type_check
+from typing import Any, Callable, Optional, TypeVar
 
+from mkosi.backport import as_file
 from mkosi.log import die
 from mkosi.types import PathString
 
@@ -187,97 +188,6 @@ def parents_below(path: Path, below: Path) -> list[Path]:
 
 @contextlib.contextmanager
 def resource_path(mod: ModuleType) -> Iterator[Path]:
-
-    # We backport as_file() from python 3.12 here temporarily since it added directory support.
-    # TODO: Remove once minimum python version is 3.12.
-
-    # SPDX-License-Identifier: PSF-2.0
-    # Copied from https://github.com/python/cpython/blob/main/Lib/importlib/resources/_common.py
-
-    @no_type_check
-    @contextlib.contextmanager
-    def _tempfile(
-        reader,
-        suffix='',
-        # gh-93353: Keep a reference to call os.remove() in late Python
-        # finalization.
-        *,
-        _os_remove=os.remove,
-    ):
-        # Not using tempfile.NamedTemporaryFile as it leads to deeper 'try'
-        # blocks due to the need to close the temporary file to work on Windows
-        # properly.
-        fd, raw_path = tempfile.mkstemp(suffix=suffix)
-        try:
-            try:
-                os.write(fd, reader())
-            finally:
-                os.close(fd)
-            del reader
-            yield Path(raw_path)
-        finally:
-            try:
-                _os_remove(raw_path)
-            except FileNotFoundError:
-                pass
-
-    @no_type_check
-    def _temp_file(path):
-        return _tempfile(path.read_bytes, suffix=path.name)
-
-    @no_type_check
-    def _is_present_dir(path) -> bool:
-        """
-        Some Traversables implement ``is_dir()`` to raise an
-        exception (i.e. ``FileNotFoundError``) when the
-        directory doesn't exist. This function wraps that call
-        to always return a boolean and only return True
-        if there's a dir and it exists.
-        """
-        with contextlib.suppress(FileNotFoundError):
-            return path.is_dir()
-        return False
-
-    @no_type_check
-    @functools.singledispatch
-    def as_file(path):
-        """
-        Given a Traversable object, return that object as a
-        path on the local file system in a context manager.
-        """
-        return _temp_dir(path) if _is_present_dir(path) else _temp_file(path)
-
-    @no_type_check
-    @contextlib.contextmanager
-    def _temp_path(dir: tempfile.TemporaryDirectory):
-        """
-        Wrap tempfile.TemporyDirectory to return a pathlib object.
-        """
-        with dir as result:
-            yield Path(result)
-
-    @no_type_check
-    @contextlib.contextmanager
-    def _temp_dir(path):
-        """
-        Given a traversable dir, recursively replicate the whole tree
-        to the file system in a context manager.
-        """
-        assert path.is_dir()
-        with _temp_path(tempfile.TemporaryDirectory()) as temp_dir:
-            yield _write_contents(temp_dir, path)
-
-    @no_type_check
-    def _write_contents(target, source):
-        child = target.joinpath(source.name)
-        if source.is_dir():
-            child.mkdir()
-            for item in source.iterdir():
-                _write_contents(child, item)
-        else:
-            child.write_bytes(source.read_bytes())
-        return child
-
     t = importlib.resources.files(mod)
     with as_file(t) as p:
         # Make sure any temporary directory that the resources are unpacked in is accessible to the invoking user so