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|
#!/usr/bin/python
import hashlib
import sqlite3
import struct
import sys
import tarfile
import zlib
from debian.debian_support import version_compare
from debian import deb822
import lzma
from dedup.hashing import HashBlacklist, DecompressedHash, SuppressingHash, hash_file
from dedup.compression import GzipDecompressor, DecompressedStream
from dedup.image import ImageHash
class ArReader(object):
global_magic = b"!<arch>\n"
file_magic = b"`\n"
def __init__(self, fileobj):
self.fileobj = fileobj
self.remaining = None
self.padding = 0
def skip(self, length):
while length:
data = self.fileobj.read(min(4096, length))
if not data:
raise ValueError("archive truncated")
length -= len(data)
def read_magic(self):
data = self.fileobj.read(len(self.global_magic))
if data != self.global_magic:
raise ValueError("ar global header not found")
self.remaining = 0
def read_entry(self):
self.skip_current_entry()
if self.padding:
if self.fileobj.read(1) != '\n':
raise ValueError("missing ar padding")
self.padding = 0
file_header = self.fileobj.read(60)
if not file_header:
raise EOFError("end of archive found")
parts = struct.unpack("16s 12s 6s 6s 8s 10s 2s", file_header)
parts = [p.rstrip(" ") for p in parts]
if parts.pop() != self.file_magic:
raise ValueError("ar file header not found")
self.remaining = int(parts[5])
self.padding = self.remaining % 2
return parts[0] # name
def skip_current_entry(self):
self.skip(self.remaining)
self.remaining = 0
def read(self, length=None):
if length is None:
length = self.remaining
else:
length = min(self.remaining, length)
data = self.fileobj.read(length)
self.remaining -= len(data)
return data
class MultiHash(object):
def __init__(self, *hashes):
self.hashes = hashes
def update(self, data):
for hasher in self.hashes:
hasher.update(data)
boring_sha512_hashes = set((
# ""
"cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e",
# "\n"
"be688838ca8686e5c90689bf2ab585cef1137c999b48c70b92f67a5c34dc15697b5d11c982ed6d71be1e1e7f7b4e0733884aa97c3f7a339a8ed03577cf74be09"))
def sha512_nontrivial():
return HashBlacklist(hashlib.sha512(), boring_sha512_hashes)
def gziphash():
hashobj = DecompressedHash(GzipDecompressor(), hashlib.sha512())
hashobj = SuppressingHash(hashobj, (ValueError, zlib.error))
hashobj.name = "gzip_sha512"
return HashBlacklist(hashobj, boring_sha512_hashes)
def imagehash():
hashobj = ImageHash(hashlib.sha512())
hashobj = SuppressingHash(hashobj, (ValueError,))
hashobj.name = "image_sha512"
return hashobj
def get_hashes(tar):
for elem in tar:
if not elem.isreg(): # excludes hard links as well
continue
hasher = MultiHash(sha512_nontrivial(), gziphash(), imagehash())
hasher = hash_file(hasher, tar.extractfile(elem))
for hashobj in hasher.hashes:
hashvalue = hashobj.hexdigest()
if hashvalue:
yield (elem.name, elem.size, hashobj.name, hashvalue)
def process_package(db, filelike):
cur = db.cursor()
af = ArReader(filelike)
af.read_magic()
state = "start"
while True:
try:
name = af.read_entry()
except EOFError:
break
if name == "control.tar.gz":
if state != "start":
raise ValueError("unexpected control.tar.gz")
state = "control"
tf = tarfile.open(fileobj=af, mode="r|gz")
for elem in tf:
if elem.name != "./control":
continue
if state != "control":
raise ValueError("duplicate control file")
state = "control_file"
control = tf.extractfile(elem).read()
control = deb822.Packages(control)
package = control["package"].encode("ascii")
version = control["version"].encode("ascii")
architecture = control["architecture"].encode("ascii")
cur.execute("SELECT version FROM package WHERE package = ?;",
(package,))
row = cur.fetchone()
if row and version_compare(row[0], version) > 0:
return # already seen a newer package
cur.execute("DELETE FROM package WHERE package = ?;",
(package,))
cur.execute("DELETE FROM content WHERE package = ?;",
(package,))
cur.execute("INSERT INTO package (package, version, architecture) VALUES (?, ?, ?);",
(package, version, architecture))
depends = control.relations.get("depends", [])
depends = set(dep[0]["name"].encode("ascii")
for dep in depends if len(dep) == 1)
cur.execute("DELETE FROM dependency WHERE package = ?;",
(package,))
cur.executemany("INSERT INTO dependency (package, required) VALUES (?, ?);",
((package, dep) for dep in depends))
break
continue
elif name == "data.tar.gz":
tf = tarfile.open(fileobj=af, mode="r|gz")
elif name == "data.tar.bz2":
tf = tarfile.open(fileobj=af, mode="r|bz2")
elif name == "data.tar.xz":
zf = DecompressedStream(af, lzma.LZMADecompressor())
tf = tarfile.open(fileobj=zf, mode="r|")
else:
continue
if state != "control_file":
raise ValueError("missing control file")
for name, size, function, hexhash in get_hashes(tf):
try:
name = name.decode("utf8")
except UnicodeDecodeError:
print("warning: skipping filename with encoding error")
continue # skip files with non-utf8 encoding for now
cur.execute("INSERT INTO content (package, filename, size, function, hash) VALUES (?, ?, ?, ?, ?);",
(package, name, size, function, hexhash))
db.commit()
return
raise ValueError("data.tar not found")
def main():
db = sqlite3.connect("test.sqlite3")
process_package(db, sys.stdin)
if __name__ == "__main__":
main()
|
