~azzar1/unity/add-show-desktop-key

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#!/usr/bin/python
# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 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

import optparse
import os
import stat
import sys
import shutil

import ivle.conf
import ivle.config
import ivle.jailbuilder.debian

class UnsafeJail(Exception):
    pass

usage = """usage: %prog [options]
(requires root)
Builds or updates the base IVLE jail."""

conf = ivle.config.Config()
build_path = ivle.conf.jail_system_build

# Parse arguments
parser = optparse.OptionParser(usage)
parser.add_option("-r", "--recreate",
    action="store_true", dest="recreate",
    help='''Completely recreate the jail - don't just update its IVLE code.
Be warned, this may download hundreds of megabytes!''')
parser.add_option("-u", "--upgrade",
    action="store_true", dest="upgrade",
    help='''Apply any package updates in the jail.''')
parser.add_option("-m", "--mirror",
    action="store", dest="apt_mirror",
    help="Sets the apt mirror.", default=conf['jail']['mirror'])
parser.add_option("--python-site-packages",
    action="store", dest="python_site_packages",
    help="Path to Python site packages directory inside the jail.",
    default=None)
(options, args) = parser.parse_args(sys.argv)

if os.geteuid() != 0:
    print >> sys.stderr, "Must be root to run buildjail."
    sys.exit(1)

if not options.recreate and not os.path.exists(build_path):
    print >> sys.stderr, "No jail exists -- please rerun with -r."
    sys.exit(1)

if (options.python_site_packages is not None and
    options.python_site_packages[:1] not in (os.path.sep, os.path.altsep)):
    print >> sys.stderr, "python-site-packages must be an absolute path."
    sys.exit(1)

if options.recreate:
    options.upgrade = True

    # Create the jail and its subdirectories
    # Note: Other subdirs will be made by copying files
    if options.apt_mirror is not None:
        os.environ['MIRROR'] = options.apt_mirror

    os.system('rm -rf --one-file-system ' + build_path)
    ivle.jailbuilder.debian.debootstrap_create_jail(conf['jail']['suite'],
              build_path, mirror=options.apt_mirror)

    ivle.jailbuilder.debian.apt_update_cache(build_path)
    ivle.jailbuilder.debian.apt_install(build_path,
                        ['python2.5', 'python-cjson', 'python-svn'])

    ivle.jailbuilder.debian.apt_clean(build_path)

if options.upgrade:
    # Run apt-get update, apt-get upgrade and apt-get clean.
    ivle.jailbuilder.debian.mangle_sources_list(build_path, clobber=True)
    ivle.jailbuilder.debian.mangle_sources_list(build_path, lines=[
            'deb %s %s%s %s' % (options.apt_mirror, conf['jail']['suite'],
                                pocket, ' '.join(['main', 'universe']))
            for pocket in ('', '-updates', '-security')])

    # Add any extra site apt sources.
    if conf['jail']['extra_sources']:
        ivle.jailbuilder.debian.mangle_sources_list(build_path,
                  conf['jail']['extra_sources'])

    # Add any extra site apt keys.
    if conf['jail']['extra_keys']:
        ivle.jailbuilder.debian.apt_add_key(build_path,
                                            conf['jail']['extra_keys'])

    ivle.jailbuilder.debian.apt_update_cache(build_path)
    ivle.jailbuilder.debian.apt_upgrade(build_path)

    # Install any extra site packages.
    if conf['jail']['extra_packages']:
        ivle.jailbuilder.debian.apt_install(build_path,
                  conf['jail']['extra_packages'])

    ivle.jailbuilder.debian.apt_clean(build_path)

if conf['jail']['devmode']:
    # Copy all console and operating system files into the jail
    services_path = os.path.join(ivle.conf.share_path, 'services')
    jail_services_path = os.path.join(build_path, services_path[1:])
    if os.path.exists(jail_services_path):
        shutil.rmtree(jail_services_path)
    shutil.copytree(services_path, jail_services_path)

    # Also copy the IVLE lib directory into the jail
    # This is necessary for running certain services

    # ivle_site_packages is the IVLE install location outside the jail
    ivle_site_packages = os.path.dirname(ivle.__file__)

    if options.python_site_packages is None:
        # Get the site packages from the IVLE install location *OUTSIDE* the
        # jail. Warning! This only works if you have the same Python site
        # packages directory inside and out (ie. same Python version).
        # If not, you should use --python-site-packages.
        jail_site_packages = os.path.join(build_path, ivle_site_packages[1:])
    else:
        # User-specified site packages
        jail_site_packages = os.path.join(build_path,
                                options.python_site_packages[1:], "ivle")
    if os.path.exists(jail_site_packages):
        shutil.rmtree(jail_site_packages)
    shutil.copytree(ivle_site_packages, jail_site_packages)

# Make /tmp and /var/lock un-world-writable. /tmp will be mounted over,
# and /var/{lock,tmp} should die.
for path in ('tmp', 'var/lock', 'var/tmp'):
    path = os.path.join(build_path, path)
    os.chmod(path, os.stat(path).st_mode & ~stat.S_IWOTH)

# Verify that nothing in the jail is world-writable.
# We don't want students to write into places that others can see.
for path, dirs, files in os.walk(build_path):
    for dname in dirs:
        d = os.path.join(path, dname)
        if os.path.islink(d):
            continue
        if os.stat(d).st_mode & stat.S_IWOTH:
            raise UnsafeJail(d)

    for fname in files:
        f = os.path.join(path, fname)
        if os.path.islink(f):
            continue
        if os.stat(f).st_mode & stat.S_IWOTH:
            if (os.path.dirname(f) == os.path.join(build_path, 'dev') and
                os.path.basename(f) in ('ptmx', 'null', 'tty', 'full', 'zero',
                                        'random', 'urandom')
                ):
                continue
            raise UnsafeJail(f)
    

if os.spawnvp(os.P_WAIT, 'rsync', ['rsync', '-a', '--delete',
              build_path + '/', ivle.conf.jail_system]) != 0:
    print >> sys.stderr, "Jail copying failed."
    sys.exit(1)

# Now mangle things a bit, so we can bind-mount the user bits in.
# /etc/passwd and /etc/ivle/ivle.conf need to be symlinks to somewhere in /home

os.rename(os.path.join(ivle.conf.jail_system, 'etc/passwd'),
          os.path.join(ivle.conf.jail_system, 'home/.passwd')
          )
os.symlink('../home/.passwd', os.path.join(ivle.conf.jail_system, 'etc/passwd'))

os.makedirs(os.path.join(ivle.conf.jail_system, "etc/ivle"))
os.symlink('../../home/.ivle.conf',
           os.path.join(ivle.conf.jail_system, "etc/ivle/ivle.conf"))