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from __future__ import annotations
import logging
import os
import shutil
from itertools import chain
from os.path import commonpath
from pathlib import Path
def create_session_view(package: Path, temp_path: Path) -> Path:
"""Allows using the file after you no longer holding a lock to it by moving it into a temp folder"""
# we'll number the active instances, and use the max value as session folder for a new build
# note we cannot change package names as PEP-491 (wheel binary format)
# is strict about file name structure
temp_path.mkdir(parents=True, exist_ok=True)
exists = [i.name for i in temp_path.iterdir()]
file_id = max(chain((0,), (int(i) for i in exists if str(i).isnumeric())))
session_dir = temp_path / str(file_id + 1)
session_dir.mkdir()
session_package = session_dir / package.name
links = False # if we can do hard links do that, otherwise just copy
if hasattr(os, "link"):
try:
os.link(package, session_package)
links = True
except (OSError, NotImplementedError):
pass
if not links:
shutil.copyfile(package, session_package)
operation = "links" if links else "copied"
common = commonpath((session_package, package))
rel_session, rel_package = session_package.relative_to(common), package.relative_to(common)
logging.debug("package %s %s to %s (%s)", rel_session, operation, rel_package, common)
return session_package
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