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deb.py
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deb.py
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import os
import shutil
import tarfile
import tempfile
import requests
import zstandard
import utils
class DebPackage:
def __init__(self, url):
self.tar = None
self.tempdir = None
self.error = None
# fetch deb
debname = url.split("/")[-1]
try:
r = requests.get(url, stream=True)
except Exception as exception:
self.error = str(exception)
return
if r.status_code != 200:
self.error = f"GET request returned {r.status_code}"
return
# copy deb to temp folder
self.tempdir = tempfile.mkdtemp()
debpath = os.path.join(self.tempdir, debname)
with open(debpath, "wb+") as f:
shutil.copyfileobj(r.raw, f)
# extract data.tar from deb to the same folder
self.tar = self._get_data_tar(debpath)
def _extract_file_deb(self, deb, name, folder="."):
# args = ["x", "--output", folder, deb, name] (binutils >= 2.34)
_, stderr = utils.run_ar(["x", deb, name], cwd=folder)
if not stderr:
return os.path.join(folder, name)
return None
def _get_data_tar(self, debpath):
folder = self.tempdir
for ext in ("gz", "xz"):
tar_name = f"data.tar.{ext}"
tar_path = self._extract_file_deb(debpath, tar_name, folder=folder)
if tar_path:
return tarfile.open(tar_path, f"r:{ext}")
# tarfile doesn't support .zst
# do it ourselves with zstandard
tar_zst_name = "data.tar.zst"
tar_zst_path = self._extract_file_deb(debpath, tar_zst_name, folder=folder)
if not tar_zst_path:
self.error = "Failed to find data.tar"
return None
dctx = zstandard.ZstdDecompressor()
tar_path = os.path.join(folder, "data.tar")
with open(tar_zst_path, "rb") as ifh, open(tar_path, "wb+") as ofh:
dctx.copy_stream(ifh, ofh)
return tarfile.open(tar_path, "r:")
def close(self):
if self.tar:
self.tar.close()
self.tar = None
if self.tempdir:
shutil.rmtree(self.tempdir)
self.tempdir = None
def __enter__(self):
return self
def __exit__(self, exception_type, exception_value, exception_traceback):
self.close()