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import contextlib
import io
import itertools
import os
import tarfile
import time
from pathlib import Path
from zipfile import ZipFile
import pytest
import zstandard
from conda_package_handling.validate import validate_converted_files_match_streaming
from conda_package_streaming.create import anonymize
from conda_package_streaming.package_streaming import (
CondaComponent,
stream_conda_component,
)
from conda_package_streaming.transmute import (
transmute,
transmute_stream,
transmute_tar_bz2,
)
@pytest.fixture
def testtar_bytes():
buffer = io.BytesIO()
with tarfile.open("test.tar.bz2", "w:bz2", fileobj=buffer) as tar:
symlink = tarfile.TarInfo(name="symlink")
symlink.type = tarfile.LNKTYPE
symlink.linkname = "target"
tar.addfile(symlink)
expected = tarfile.TarInfo(name="info/expected")
tar.addfile(expected, io.BytesIO())
unexpected = tarfile.TarInfo(name="info/unexpected")
tar.addfile(unexpected, io.BytesIO())
return buffer.getbuffer()
@contextlib.contextmanager
def timeme(message: str = ""):
begin = time.time()
yield
end = time.time()
print(f"{message}{end - begin:0.2f}s")
@pytest.mark.skip(reason="Conda is not yet available for Debian")
def test_transmute(conda_paths: list[Path], tmpdir):
tarbz_packages = []
for path in conda_paths:
path = str(path)
if path.endswith(".tar.bz2") and (1 << 20 < os.stat(path).st_size < 1 << 22):
tarbz_packages = [path]
conda_packages = [] # not supported
assert tarbz_packages, "no medium-sized .tar.bz2 packages found"
metadata_checks = 0
for packages in (conda_packages, tarbz_packages):
for package in packages:
with timeme(f"{package} took "):
out = transmute(package, tmpdir)
_, missing, mismatched = validate_converted_files_match_streaming(
out, package, strict=True
)
assert missing == mismatched == []
if out.name.endswith(".conda"):
with ZipFile(out) as zf:
metadata_checks += 1
assert "metadata.json" in zf.namelist()
assert metadata_checks > 0
def test_transmute_symlink(tmpdir, testtar_bytes):
testtar = Path(tmpdir, "test.tar.bz2")
testtar.write_bytes(testtar_bytes)
out = transmute(str(testtar), tmpdir)
_, missing, mismatched = validate_converted_files_match_streaming(
out, testtar, strict=True
)
assert missing == mismatched == []
def test_transmute_info_filter(tmpdir, testtar_bytes):
testtar = Path(tmpdir, "test.tar.bz2")
testtar.write_bytes(testtar_bytes)
transmute(
str(testtar), tmpdir, is_info=lambda filename: filename == "info/expected"
)
with open(Path(tmpdir, "test.conda"), "rb") as fileobj:
for component, expected in (
(CondaComponent.info, {"info/expected"}),
(
CondaComponent.pkg,
{
"info/unexpected",
"symlink",
},
),
):
items = stream_conda_component("test.conda", fileobj, component)
assert {member.name for tar, member in items} == expected, items
@pytest.mark.skip(reason="Conda is not yet available for Debian")
def test_transmute_backwards(tmpdir, conda_paths):
tarbz_packages = []
for path in conda_paths:
path = str(path)
if path.endswith(".conda") and (1 << 20 < os.stat(path).st_size < 1 << 22):
tarbz_packages = [path]
conda_packages = [] # not supported
assert tarbz_packages, "no medium-sized .conda packages found"
for packages in (conda_packages, tarbz_packages):
for package in packages:
with timeme(f"{package} took "):
out = transmute_tar_bz2(package, tmpdir)
_, missing, mismatched = validate_converted_files_match_streaming(
out, package, strict=True
)
assert missing == mismatched == []
def test_transmute_tarbz2_to_tarbz2(tmpdir, testtar_bytes):
testtar = Path(tmpdir, "test.tar.bz2")
testtar.write_bytes(testtar_bytes)
outdir = Path(tmpdir, "output")
outdir.mkdir()
out = transmute_tar_bz2(str(testtar), outdir)
_, missing, mismatched = validate_converted_files_match_streaming(
out, testtar, strict=True
)
assert missing == mismatched == []
def test_transmute_conditional_zip64(tmp_path, mocker):
"""
Test that zip64 is used in transmute after a threshold.
"""
LIMIT = 16384
for test_size, extra_expected in (LIMIT // 2, False), (LIMIT * 2, True):
mocker.patch("conda_package_streaming.create.CONDA_ZIP64_LIMIT", new=LIMIT)
mocker.patch("zipfile.ZIP64_LIMIT", new=LIMIT)
tmp_tar = tmp_path / f"{test_size}.tar.bz2"
with tarfile.open(tmp_tar, "w:bz2") as tar:
pkg = tarfile.TarInfo(name="packagedata")
data = io.BytesIO(os.urandom(test_size))
pkg.size = len(data.getbuffer())
tar.addfile(pkg, data)
info = tarfile.TarInfo(name="info/data")
data = io.BytesIO(os.urandom(test_size))
info.size = len(data.getbuffer())
tar.addfile(info, data)
out = transmute(str(tmp_tar), tmp_path)
with ZipFile(out) as e:
assert e.filelist[0].extra == b""
# when zip64 extension is used, extra contains zip64 headers
assert bool(e.filelist[1].extra) == extra_expected
assert bool(e.filelist[2].extra) == extra_expected
@pytest.mark.skip(reason="Conda is not yet available for Debian")
def test_transmute_stream(tmpdir, conda_paths):
"""
Test example from transmute_stream documentation. Recompress .conda using
transmute_stream()
"""
conda_packages = []
for path in conda_paths:
if path.name.endswith(".conda") and (1 << 20 < os.stat(path).st_size < 1 << 22):
conda_packages.append(path)
for package in conda_packages[:3]:
file_id = package.name
transmute_stream(
file_id,
tmpdir,
compressor=lambda: zstandard.ZstdCompressor(),
package_stream=itertools.chain(
stream_conda_component(package, component=CondaComponent.pkg),
stream_conda_component(package, component=CondaComponent.info),
),
)
def test_anonymize_helper():
ti = tarfile.TarInfo(name="info")
ti.uid = ti.gid = 500
ti.uname = ti.gname = "somebody"
anon = anonymize(ti)
assert anon.name == ti.name # they are also the same object
assert anon.uid == anon.gid == 0
assert anon.uname == anon.gname == ""
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