Spotter-VM/build/usr/lib/python3.6/lxcbuild/lxcpacker.py

90 lines
3.5 KiB
Python

# -*- coding: utf-8 -*-
import hashlib
import json
import os
import subprocess
import sys
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import ec
from cryptography.hazmat.primitives.serialization import load_pem_private_key
PKG_ROOT = '/srv/build/lxc'
PRIVATE_KEY = '/srv/build/packages.key'
LXC_STORAGE = '/var/lib/lxc/storage'
class LXCPacker:
def __init__(self, image):
self.image = image
self.tar_path = None
self.xz_path = None
def pack(self):
# Prepare package file names
self.tar_path = os.path.join(PKG_ROOT, '{}.tar'.format(self.image.upper_layer))
self.xz_path = '{}.xz'.format(self.tar_path)
if os.path.exists(self.xz_path):
print('Package {} already exists, skipping packaging tasks'.format(self.xz_path))
return
os.makedirs(PKG_ROOT, 0o755, True)
self.create_archive()
self.register_package()
self.sign_packages()
def create_archive(self):
# Create archive
print('Archiving', self.image.upper_layer)
subprocess.run(['tar', '--xattrs', '-cpf', self.tar_path, os.path.join(LXC_STORAGE, self.image.upper_layer)], cwd='/')
# Add install/upgrade/uninstall scripts
scripts = ('install', 'install.sh', 'upgrade', 'upgrade.sh', 'uninstall', 'uninstall.sh')
scripts = [s for s in scripts if os.path.exists(os.path.join(self.image.build_dir, s))]
subprocess.run(['tar', '--transform', 's|^|srv/{}/|'.format(self.image.upper_layer), '-rpf', self.tar_path] + scripts, cwd=self.image.build_dir)
# Compress the tarball with xz (LZMA2)
print('Compressing', self.tar_path, '({:.2f} MB)'.format(os.path.getsize(self.tar_path)/1048576))
subprocess.run(['xz', '-9', self.tar_path])
print('Compressed ', self.xz_path, '({:.2f} MB)'.format(os.path.getsize(self.xz_path)/1048576))
def register_package(self):
# Prepare metadata
meta = self.image.meta.copy()
meta['lxc'] = {}
for key in ('layers', 'mounts', 'env', 'cmd', 'cwd', 'uid', 'gid', 'halt'):
value = getattr(self.image, key)
if value:
meta['lxc'][key] = value
# Register package
print('Registering package')
packages = {}
packages_file = os.path.join(PKG_ROOT, 'packages')
if os.path.exists(packages_file):
with open(packages_file, 'r') as f:
packages = json.load(f)
packages[self.image.name] = meta
packages[self.image.name]['size'] = os.path.getsize(self.xz_path)
packages[self.image.name]['sha512'] = hash_file(self.xz_path)
with open(packages_file, 'w') as f:
json.dump(packages, f, sort_keys=True, indent=4)
def sign_packages(self):
# Sign packages file
print('Signing packages')
with open(PRIVATE_KEY, 'rb') as f:
priv_key = load_pem_private_key(f.read(), None, default_backend())
with open(os.path.join(PKG_ROOT, 'packages'), 'rb') as f:
data = f.read()
with open(os.path.join(PKG_ROOT, 'packages.sig'), 'wb') as f:
f.write(priv_key.sign(data, ec.ECDSA(hashes.SHA512())))
def hash_file(file_path):
sha512 = hashlib.sha512()
with open(file_path, 'rb') as f:
while True:
data = f.read(65536)
if not data:
break
sha512.update(data)
return sha512.hexdigest()