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# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 2007-2009 The University of Melbourne
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
'''Debian-specific bits of the jail building process.'''
import os
import subprocess
from ivle.jailbuilder.exceptions import JailBuildError
def debootstrap_create_jail(release, path, components=['main', 'universe'],
mirror=None):
"""Create a Debian-based jail using debootstrap."""
if mirror is None:
mirror = 'http://archive.ubuntu.com/ubuntu'
ec = os.spawnvp(os.P_WAIT, 'debootstrap',
['debootstrap', '--components=' + ','.join(components),
'--include=ubuntu-keyring', '--variant=minbase',
release, path, mirror])
if ec != 0:
raise JailBuildError('debootstrap failed with code %d' % ec)
mangle_sources_list(path, clobber=True)
mangle_sources_list(path, lines=[
'deb %s %s%s %s' % (mirror, release, pocket, ' '.join(components))
for pocket in ('', '-updates', '-security')])
def mangle_sources_list(path, lines=[], clobber=False):
"""Add lines to a sources.list, optionally clobbering an existing one."""
f = open(os.path.join(path, 'etc/apt/sources.list'),
'w' if clobber else 'a')
for line in lines:
f.write(line + '\n')
f.close()
def _execute_in_chroot(path, argv, stdin=None):
"""Execute a binary in a chroot, with optional stdin."""
pid = subprocess.Popen(['chroot', path] + argv, stdin=subprocess.PIPE)
pid.communicate(stdin)
if pid.returncode != 0:
raise JailBuildError('command failed with code %d' % pid.returncode)
def apt_update_cache(path):
"""Update the apt cache in a chroot."""
_execute_in_chroot(path, ['apt-get', '-y', 'update'])
def apt_upgrade(path):
"""Upgrade apt packages in a chroot."""
_execute_in_chroot(path, ['apt-get', '-y', 'upgrade'])
def apt_install(path, packages=None):
"""Install apt packages in a chroot."""
if not packages:
return
_execute_in_chroot(path, ['apt-get', '-y', 'install'] + packages)
def apt_clean(path):
"""Clean the apt package cache in a chroot."""
_execute_in_chroot(path, ['apt-get', 'clean'])
def apt_add_key(path, key_text):
"""Add a key to authenticate apt repositories in a chroot."""
_execute_in_chroot(path, ['apt-key', 'add', '-'], stdin=key_text)
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