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1092.1.16
by William Grant
Reimplement setup/buildjail.sh in Python. This means that sites can configure |
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# IVLE - Informatics Virtual Learning Environment
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# Copyright (C) 2007-2009 The University of Melbourne
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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'''Debian-specific bits of the jail building process.'''
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import os |
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import subprocess |
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from ivle.jailbuilder.exceptions import JailBuildError |
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def debootstrap_create_jail(release, path, components=['main', 'universe'], |
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mirror=None): |
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"""Create a Debian-based jail using debootstrap."""
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if mirror is None: |
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mirror = 'http://archive.ubuntu.com/ubuntu' |
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ec = os.spawnvp(os.P_WAIT, 'debootstrap', |
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['debootstrap', '--components=' + ','.join(components), |
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'--include=ubuntu-keyring', '--variant=minbase', |
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release, path, mirror]) |
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if ec != 0: |
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raise JailBuildError('debootstrap failed with code %d' % ec) |
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mangle_sources_list(path, clobber=True) |
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mangle_sources_list(path, lines=[ |
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'deb %s %s%s %s' % (mirror, release, pocket, ' '.join(components)) |
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for pocket in ('', '-updates', '-security')]) |
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def mangle_sources_list(path, lines=[], clobber=False): |
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"""Add lines to a sources.list, optionally clobbering an existing one."""
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f = open(os.path.join(path, 'etc/apt/sources.list'), |
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'w' if clobber else 'a') |
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for line in lines: |
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f.write(line + '\n') |
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f.close() |
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def _execute_in_chroot(path, argv, stdin=None): |
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"""Execute a binary in a chroot, with optional stdin."""
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pid = subprocess.Popen(['chroot', path] + argv, stdin=subprocess.PIPE) |
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pid.communicate(stdin) |
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if pid.returncode != 0: |
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raise JailBuildError('command failed with code %d' % pid.returncode) |
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def apt_update_cache(path): |
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"""Update the apt cache in a chroot."""
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_execute_in_chroot(path, ['apt-get', '-y', 'update']) |
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def apt_upgrade(path): |
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"""Upgrade apt packages in a chroot."""
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_execute_in_chroot(path, ['apt-get', '-y', 'upgrade']) |
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def apt_install(path, packages=None): |
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"""Install apt packages in a chroot."""
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if not packages: |
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return
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_execute_in_chroot(path, ['apt-get', '-y', 'install'] + packages) |
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def apt_clean(path): |
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"""Clean the apt package cache in a chroot."""
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_execute_in_chroot(path, ['apt-get', 'clean']) |
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def apt_add_key(path, key_text): |
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"""Add a key to authenticate apt repositories in a chroot."""
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_execute_in_chroot(path, ['apt-key', 'add', '-'], stdin=key_text) |