Erste Version mit erstem Datenmodell realisiert. Noch kein Template, kein View.

venv/lib/python3.12/site-packages/django/utils/_os.py

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+import os
+import tempfile
+from os.path import abspath, curdir, dirname, join, normcase, sep
+from pathlib import Path
+
+from django.core.exceptions import SuspiciousFileOperation
+
+
+# Copied verbatim (minus `os.path` fixes) from:
+# https://github.com/python/cpython/pull/23901.
+# Python versions >= PY315 may include this fix, so periodic checks are needed
+# to remove this vendored copy of `makedirs` once solved upstream.
+def makedirs(name, mode=0o777, exist_ok=False, *, parent_mode=None):
+    """makedirs(name [, mode=0o777][, exist_ok=False][, parent_mode=None])
+
+    Super-mkdir; create a leaf directory and all intermediate ones.  Works like
+    mkdir, except that any intermediate path segment (not just the rightmost)
+    will be created if it does not exist. If the target directory already
+    exists, raise an OSError if exist_ok is False. Otherwise no exception is
+    raised.  If parent_mode is not None, it will be used as the mode for any
+    newly-created, intermediate-level directories. Otherwise, intermediate
+    directories are created with the default permissions (respecting umask).
+    This is recursive.
+
+    """
+    head, tail = os.path.split(name)
+    if not tail:
+        head, tail = os.path.split(head)
+    if head and tail and not os.path.exists(head):
+        try:
+            if parent_mode is not None:
+                makedirs(
+                    head, mode=parent_mode, exist_ok=exist_ok, parent_mode=parent_mode
+                )
+            else:
+                makedirs(head, exist_ok=exist_ok)
+        except FileExistsError:
+            # Defeats race condition when another thread created the path
+            pass
+        cdir = curdir
+        if isinstance(tail, bytes):
+            cdir = bytes(curdir, "ASCII")
+        if tail == cdir:  # xxx/newdir/. exists if xxx/newdir exists
+            return
+    try:
+        os.mkdir(name, mode)
+        # PY315: The call to `chmod()` is not in the CPython proposed code.
+        # Apply `chmod()` after `mkdir()` to enforce the exact requested
+        # permissions, since the kernel masks the mode argument with the
+        # process umask. This guarantees consistent directory permissions
+        # without mutating global umask state.
+        os.chmod(name, mode)
+    except OSError:
+        # Cannot rely on checking for EEXIST, since the operating system
+        # could give priority to other errors like EACCES or EROFS
+        if not exist_ok or not os.path.isdir(name):
+            raise
+
+
+def safe_makedirs(name, mode=0o777, exist_ok=False):
+    """Create directories recursively with explicit `mode` on each level."""
+    makedirs(name=name, mode=mode, exist_ok=exist_ok, parent_mode=mode)
+
+
+def safe_join(base, *paths):
+    """
+    Join one or more path components to the base path component intelligently.
+    Return a normalized, absolute version of the final path.
+
+    Raise SuspiciousFileOperation if the final path isn't located inside of the
+    base path component.
+    """
+    final_path = abspath(join(base, *paths))
+    base_path = abspath(base)
+    # Ensure final_path starts with base_path (using normcase to ensure we
+    # don't false-negative on case insensitive operating systems like Windows),
+    # further, one of the following conditions must be true:
+    #  a) The next character is the path separator (to prevent conditions like
+    #     safe_join("/dir", "/../d"))
+    #  b) The final path must be the same as the base path.
+    #  c) The base path must be the most root path (meaning either "/" or
+    #     "C:\\")
+    if (
+        not normcase(final_path).startswith(normcase(base_path + sep))
+        and normcase(final_path) != normcase(base_path)
+        and dirname(normcase(base_path)) != normcase(base_path)
+    ):
+        raise SuspiciousFileOperation(
+            "The joined path ({}) is located outside of the base path "
+            "component ({})".format(final_path, base_path)
+        )
+    return final_path
+
+
+def symlinks_supported():
+    """
+    Return whether or not creating symlinks are supported in the host platform
+    and/or if they are allowed to be created (e.g. on Windows it requires admin
+    permissions).
+    """
+    with tempfile.TemporaryDirectory() as temp_dir:
+        original_path = os.path.join(temp_dir, "original")
+        symlink_path = os.path.join(temp_dir, "symlink")
+        os.makedirs(original_path)
+        try:
+            os.symlink(original_path, symlink_path)
+            supported = True
+        except (OSError, NotImplementedError):
+            supported = False
+        return supported
+
+
+def to_path(value):
+    """Convert value to a pathlib.Path instance, if not already a Path."""
+    if isinstance(value, Path):
+        return value
+    elif not isinstance(value, str):
+        raise TypeError("Invalid path type: %s" % type(value).__name__)
+    return Path(value)