File size: 1,879 Bytes
9d4a3b0 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | #!/usr/bin/env python3
"""Expand the projected standalone runtime without accepting archive links."""
from __future__ import annotations
import os
import shutil
import stat
import tarfile
from pathlib import Path, PurePosixPath
ROOT = Path(__file__).resolve().parent
ARCHIVE = ROOT / "standalone.tar.gz"
DESTINATION = ROOT / "standalone"
def target_for(name: str) -> Path:
relative = PurePosixPath(name)
if relative.is_absolute() or not relative.parts or any(
part in {"", ".", ".."} for part in relative.parts
):
raise RuntimeError(f"unsafe standalone archive member: {name!r}")
return DESTINATION.joinpath(*relative.parts)
if DESTINATION.exists():
raise RuntimeError("standalone destination already exists")
DESTINATION.mkdir(mode=0o700)
try:
with tarfile.open(ARCHIVE, mode="r:gz") as archive:
for member in archive:
target = target_for(member.name)
if member.isdir():
target.mkdir(parents=True, exist_ok=True)
target.chmod(stat.S_IMODE(member.mode) | 0o500)
continue
if not member.isfile() or member.issym() or member.islnk():
raise RuntimeError(
f"non-regular standalone archive member: {member.name!r}"
)
target.parent.mkdir(parents=True, exist_ok=True)
source = archive.extractfile(member)
if source is None:
raise RuntimeError(f"unreadable archive member: {member.name!r}")
with source, target.open("xb") as destination:
shutil.copyfileobj(source, destination, length=1024 * 1024)
destination.flush()
os.fsync(destination.fileno())
target.chmod(stat.S_IMODE(member.mode))
except BaseException:
shutil.rmtree(DESTINATION, ignore_errors=True)
raise
|