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Mini Shell
"""
A rough layout of the current storage goes as:
virtualenv-app-data
├── py - <version> <cache information about python interpreters>
│ └── *.json/lock
├── wheel <cache wheels used for seeding>
│ ├── house
│ │ └── *.whl <wheels downloaded go here>
│ └── <python major.minor> -> 3.9
│ ├── img-<version>
│ │ └── image
│ │ └── <install class> -> CopyPipInstall / SymlinkPipInstall
│ │ └── <wheel name> -> pip-20.1.1-py2.py3-none-any
│ └── embed
│ └── 3 -> json format versioning
│ └── *.json -> for every distribution contains data about newer embed versions and releases
└─── unzip <in zip app we cannot refer to some internal files, so first extract them>
└── <virtualenv version>
├── py_info.py
├── debug.py
└── _virtualenv.py
"""
import json
import logging
from abc import ABCMeta
from contextlib import contextmanager
from hashlib import sha256
from virtualenv.util.lock import ReentrantFileLock
from virtualenv.util.path import safe_delete
from virtualenv.util.zipapp import extract
from virtualenv.version import __version__
from .base import AppData, ContentStore
class AppDataDiskFolder(AppData):
"""
Store the application data on the disk within a folder layout.
"""
transient = False
can_update = True
def __init__(self, folder):
self.lock = ReentrantFileLock(folder)
def __repr__(self):
return f"{type(self).__name__}({self.lock.path})"
def __str__(self):
return str(self.lock.path)
def reset(self):
logging.debug("reset app data folder %s", self.lock.path)
safe_delete(self.lock.path)
def close(self):
"""do nothing"""
@contextmanager
def locked(self, path):
path_lock = self.lock / path
with path_lock:
yield path_lock.path
@contextmanager
def extract(self, path, to_folder):
if to_folder is not None:
root = ReentrantFileLock(to_folder())
else:
root = self.lock / "unzip" / __version__
with root.lock_for_key(path.name):
dest = root.path / path.name
if not dest.exists():
extract(path, dest)
yield dest
@property
def py_info_at(self):
return self.lock / "py_info" / "1"
def py_info(self, path):
return PyInfoStoreDisk(self.py_info_at, path)
def py_info_clear(self):
""" """
py_info_folder = self.py_info_at
with py_info_folder:
for filename in py_info_folder.path.iterdir():
if filename.suffix == ".json":
with py_info_folder.lock_for_key(filename.stem):
if filename.exists():
filename.unlink()
def embed_update_log(self, distribution, for_py_version):
return EmbedDistributionUpdateStoreDisk(self.lock / "wheel" / for_py_version / "embed" / "3", distribution)
@property
def house(self):
path = self.lock.path / "wheel" / "house"
path.mkdir(parents=True, exist_ok=True)
return path
def wheel_image(self, for_py_version, name):
return self.lock.path / "wheel" / for_py_version / "image" / "1" / name
class JSONStoreDisk(ContentStore, metaclass=ABCMeta):
def __init__(self, in_folder, key, msg, msg_args):
self.in_folder = in_folder
self.key = key
self.msg = msg
self.msg_args = msg_args + (self.file,)
@property
def file(self):
return self.in_folder.path / f"{self.key}.json"
def exists(self):
return self.file.exists()
def read(self):
data, bad_format = None, False
try:
data = json.loads(self.file.read_text(encoding="utf-8"))
logging.debug(f"got {self.msg} from %s", *self.msg_args)
return data
except ValueError:
bad_format = True
except Exception:
pass
if bad_format:
try:
self.remove()
except OSError: # reading and writing on the same file may cause race on multiple processes
pass
return None
def remove(self):
self.file.unlink()
logging.debug(f"removed {self.msg} at %s", *self.msg_args)
@contextmanager
def locked(self):
with self.in_folder.lock_for_key(self.key):
yield
def write(self, content):
folder = self.file.parent
folder.mkdir(parents=True, exist_ok=True)
self.file.write_text(json.dumps(content, sort_keys=True, indent=2), encoding="utf-8")
logging.debug(f"wrote {self.msg} at %s", *self.msg_args)
class PyInfoStoreDisk(JSONStoreDisk):
def __init__(self, in_folder, path):
key = sha256(str(path).encode("utf-8")).hexdigest()
super().__init__(in_folder, key, "python info of %s", (path,))
class EmbedDistributionUpdateStoreDisk(JSONStoreDisk):
def __init__(self, in_folder, distribution):
super().__init__(
in_folder,
distribution,
"embed update of distribution %s",
(distribution,),
)
__all__ = [
"AppDataDiskFolder",
"JSONStoreDisk",
"PyInfoStoreDisk",
]
Zerion Mini Shell 1.0