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bin/ivle-buildjail
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import optparse
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import os
 
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import stat
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import sys
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import shutil
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import ivle.config
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import ivle.jailbuilder.debian
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class UnsafeJail(Exception):
 
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    pass
 
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usage = """usage: %prog [options]
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(requires root)
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Builds or updates the base IVLE jail."""
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        shutil.rmtree(jail_site_packages)
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    shutil.copytree(ivle_site_packages, jail_site_packages)
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# Make /tmp and /var/lock un-world-writable. /tmp will be mounted over,
 
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# and /var/{lock,tmp} should die.
 
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for path in ('tmp', 'var/lock', 'var/tmp'):
 
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    path = os.path.join(build_path, path)
 
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    os.chmod(path, os.stat(path).st_mode & ~stat.S_IWOTH)
 
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# Verify that nothing in the jail is world-writable.
 
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# We don't want students to write into places that others can see.
 
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for path, dirs, files in os.walk(build_path):
 
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    for dname in dirs:
 
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        d = os.path.join(path, dname)
 
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        if os.path.islink(d):
 
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            continue
 
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        if os.stat(d).st_mode & stat.S_IWOTH:
 
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            raise UnsafeJail(d)
 
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    for fname in files:
 
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        f = os.path.join(path, fname)
 
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        if os.path.islink(f):
 
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            continue
 
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        if os.stat(f).st_mode & stat.S_IWOTH:
 
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            if (os.path.dirname(f) == os.path.join(build_path, 'dev') and
 
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                os.path.basename(f) in ('ptmx', 'null', 'tty', 'full', 'zero',
 
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                                        'random', 'urandom')
 
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                ):
 
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                continue
 
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            raise UnsafeJail(f)
 
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if os.spawnvp(os.P_WAIT, 'rsync', ['rsync', '-a', '--delete',
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              build_path + '/', ivle.conf.jail_system]) != 0:
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    print >> sys.stderr, "Jail copying failed."
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    sys.exit(1)
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# Now mangle things a bit, so we can bind-mount the user bits in.
 
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# /etc/passwd and /etc/ivle/ivle.conf need to be symlinks to somewhere in /home
 
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os.rename(os.path.join(ivle.conf.jail_system, 'etc/passwd'),
 
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          os.path.join(ivle.conf.jail_system, 'home/.passwd')
 
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          )
 
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os.symlink('../home/.passwd', os.path.join(ivle.conf.jail_system, 'etc/passwd'))
 
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os.makedirs(os.path.join(ivle.conf.jail_system, "etc/ivle"))
 
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os.symlink('../../home/.ivle.conf',
 
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           os.path.join(ivle.conf.jail_system, "etc/ivle/ivle.conf"))