Datasets:
File size: 3,874 Bytes
0e239c6 | 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 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | import hashlib
import io
import json
import os
from pathlib import Path
import tarfile
import tempfile
import unittest
from materialize_agent_context import materialize
def fixture(root,links=(),parts=False):
archive=root/'context.tar.gz';entries=[]
with tarfile.open(archive,'w:gz') as tar:
body=b'original upstream instructions\n';name='testbed/repo/AGENTS.md'
info=tarfile.TarInfo(name);info.size=len(body);info.mode=0o644;tar.addfile(info,io.BytesIO(body))
entries.append({'path':name,'bytes':len(body),'sha256':hashlib.sha256(body).hexdigest(),'mode':0o644})
for name,target in links:
info=tarfile.TarInfo(name);info.type=tarfile.SYMTYPE;info.linkname=target;info.mode=0o777;tar.addfile(info)
data=target.encode();entries.append({'path':name,'kind':'symlink','target':target,'bytes':len(data),'sha256':hashlib.sha256(data).hexdigest(),'mode':0o777})
raw=archive.read_bytes();reference={'path':archive.name,'bytes':len(raw),'sha256':hashlib.sha256(raw).hexdigest()}
if parts:
offset=0;reference['parts']=[]
for index,block in enumerate([raw[:len(raw)//2],raw[len(raw)//2:]]):
path=root/f'context.tar.gz.part-{index:04d}';path.write_bytes(block)
reference['parts'].append({'path':path.name,'offset':offset,'bytes':len(block),'sha256':hashlib.sha256(block).hexdigest()});offset+=len(block)
manifest=root/'context-manifest.json';manifest.write_text(json.dumps({'archive':reference,'files':entries}))
return manifest
class ContextV2Tests(unittest.TestCase):
def test_internal_upstream_link_remains_a_link(self):
with tempfile.TemporaryDirectory() as temporary:
root=Path(temporary);manifest=fixture(root,[('testbed/repo/CLAUDE.md','AGENTS.md')])
try:materialize(manifest,root/'out')
except ValueError as error:self.fail('Valid original source symlink rejected: '+str(error))
path=root/'out/testbed/repo/CLAUDE.md'
self.assertTrue(path.is_symlink());self.assertEqual(os.readlink(path),'AGENTS.md')
def test_escape_link_is_rejected(self):
with tempfile.TemporaryDirectory() as temporary:
root=Path(temporary);manifest=fixture(root,[('escape','../outside')])
with self.assertRaises(ValueError):materialize(manifest,root/'out')
def test_indirect_escape_via_another_link_is_rejected(self):
with tempfile.TemporaryDirectory() as temporary:
root=Path(temporary);manifest=fixture(root,[('d1/a','..'),('d2/b','../d1/a/../outside')])
with self.assertRaises(ValueError):materialize(manifest,root/'out')
self.assertFalse((root/'out').exists())
def test_archive_cannot_write_through_a_link_parent(self):
with tempfile.TemporaryDirectory() as temporary:
root=Path(temporary);manifest=fixture(root,[('testbed','inside')])
with self.assertRaises(ValueError):materialize(manifest,root/'out')
def test_parts_are_sufficient_without_full_archive(self):
with tempfile.TemporaryDirectory() as temporary:
root=Path(temporary);manifest=fixture(root,parts=True);(root/'context.tar.gz').unlink()
try:materialize(manifest,root/'out')
except (OSError,ValueError) as error:self.fail('Closed archive parts were not restored: '+str(error))
self.assertTrue((root/'out/testbed/repo/AGENTS.md').is_file())
def test_part_tampering_cannot_be_ignored_when_full_archive_exists(self):
with tempfile.TemporaryDirectory() as temporary:
root=Path(temporary);manifest=fixture(root,parts=True)
with (root/'context.tar.gz.part-0000').open('ab') as stream:stream.write(b'changed')
with self.assertRaises(ValueError):materialize(manifest,root/'out')
if __name__=='__main__':unittest.main()
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