#!/usr/bin/env python2

import argparse
import subprocess
import os
import sys
import errno

default_local_bin_location = os.path.expanduser('~/.local/bin/')
ROOT = os.path.abspath(os.path.dirname(__file__))

parser = argparse.ArgumentParser(prog="create-workspace.py")
parser.add_argument('-P', '--pupy-git-folder', default=ROOT, help='Path to pupy git')
parser.add_argument('-NC', '--do-not-compile-templates',
                    action='store_true', default=False, help='Do not compile payload templates')
parser.add_argument('-R', '--docker-repo',
                    help='Use non-default toolchains repo (Use "local" to build all the things on your PC')
parser.add_argument('-B', '--bin-path', default=default_local_bin_location,
                    help='Store pupy launch wrapper to this folder (default={})'.format(
                        default_local_bin_location))
parser.add_argument('-NI', '--no-pip-install-deps', action='store_true', default=False,
                    help='Do not install missing python deps (virtualenv, python-docker) using pip')
parser.add_argument('workdir', help='Location of workdir')


def main():
    args = parser.parse_args()

    try:
        with open('/dev/null', 'w') as devnull:
            subprocess.check_call(['git', '--help'], stdout=devnull)
    except:
        sys.exit("Install git (example: sudo apt-get install git)")

    if not args.do_not_compile_templates:
        try:
            with open('/dev/null', 'w') as devnull:
                subprocess.check_call(['docker', '--help'], stdout=devnull)
        except:
            sys.exit("Install docker: https://docs.docker.com/install/")

        vsc = '/proc/sys/abi/vsyscall32'
        if os.path.isfile(vsc):
            vsyscall = int(open(vsc).read())
            if not vsyscall:
                sys.exit('You need to have vsyscall enabled:\n~> sudo sysctl -w abi.vsyscall32=1\n~> sudo reboot')

    try:
        import virtualenv
    except:
        if args.no_pip_install_deps:
            sys.exit('virtualenv missing: pip install --user virtualenv')
        else:
            subprocess.call('pip install --user virtualenv')

        import virtualenv

    workdir = os.path.abspath(args.workdir)

    if not os.path.isfile(os.path.join(args.pupy_git_folder, 'create-workspace.py')):
        sys.exit('{} is not pupy project folder'.format(args.pupy_git_folder))

    if os.path.isdir(workdir) and os.listdir(workdir):
        sys.exit('{} is not empty'.format(workdir))

    pupy = os.path.abspath(args.pupy_git_folder)

    print "[+] Pupy at {}".format(pupy)

    if not args.do_not_compile_templates:
        print "[+] Compile common templates"
        env = os.environ.copy()
        if args.docker_repo:
            env['REPO'] = args.docker_repo

        subprocess.check_call([
            os.path.join(args.pupy_git_folder, 'client', 'build-docker.sh')
        ], env=env, cwd=os.path.join(args.pupy_git_folder, 'client'))

    print "[+] Create VirtualEnv environment"

    try:
        os.makedirs(args.workdir)
    except OSError, e:
        if e.errno == errno.EEXIST:
            pass

    virtualenv.create_environment(workdir)

    print "[+] Install dependencies"
    subprocess.check_call([
        os.path.join(workdir, 'bin', 'pip'),
        'install',
        '-r', 'requirements.txt'
    ], cwd=os.path.join(pupy, 'pupy'))

    subprocess.check_call([
        os.path.abspath(os.path.join(workdir, 'bin', 'pip')),
        'install', '--upgrade', '--force-reinstall',
        'pycryptodome'
    ], cwd=os.path.join(pupy, 'pupy'))

    print "[+] Create pupysh wrapper"
    pupysh_path = os.path.join(workdir, 'bin', 'pupysh')
    pupysh_update_path = os.path.join(workdir, 'bin', 'pupysh-update')

    with open(pupysh_path, 'w') as pupysh:
        wa = os.path.abspath(workdir)
        print >>pupysh, '#!/bin/sh'
        print >>pupysh, 'cd {}'.format(wa)
        print >>pupysh, 'exec bin/python -B {} "$@"'.format(
            os.path.join(pupy, 'pupy', 'pupysh.py'))

    os.chmod(pupysh_path, 0755)

    with open(pupysh_update_path, 'w') as pupysh_update:
        wa = os.path.abspath(workdir)
        print >>pupysh_update, '#!/bin/sh'
        print >>pupysh_update, 'set -e'
        print >>pupysh_update, 'echo "[+] Update pupy repo"'
        print >>pupysh_update, 'cd {}; git pull --recurse-submodules'.format(pupy)
        print >>pupysh_update, 'echo "[+] Update python dependencies"'
        print >>pupysh_update, 'source {}/bin/activate; cd pupy; pip install --upgrade -r requirements.txt'.format(
            workdir)
        if not args.do_not_compile_templates:
            print >>pupysh_update, 'echo "[+] Recompile templates"'
            for target in ('windows', 'linux32', 'linux64'):
                print >>pupysh_update, 'echo "[+] Build {}"'.format(target)
                print >>pupysh_update, 'docker start -a build-pupy-{}'.format(target)
        print >>pupysh_update, 'echo "[+] Update completed"'

    os.chmod(pupysh_update_path, 0755)

    if args.bin_path:
        bin_path = os.path.abspath(args.bin_path)
        print "[+] Store symlink to pupysh to {}".format(bin_path)

        if not os.path.isdir(bin_path):
            os.makedirs(bin_path)

        for src, sympath in ((pupysh_path, 'pupysh'), (pupysh_update_path, 'pupysh-update')):
            sympath = os.path.join(bin_path, sympath)

            if os.path.islink(sympath):
                os.unlink(sympath)

            elif os.path.exists(sympath):
                sys.exit("[-] File at {} already exists and not symlink".format(sympath))

            os.symlink(src, sympath)

        if bin_path not in os.environ['PATH']:
            print "[-] {} is not in your PATH!".format(bin_path)
        else:
            print "[I] To execute pupysh:"
            print "~ > pupysh"
            print "[I] To update:"
            print "~ > pupysh-update"

    else:
        print "[I] To execute pupysh:"
        print "~ > {}".format(pupysh_path)
        print "[I] To update:"
        print "~ > {}".format(pupysh_update_path)


if __name__ == '__main__':
    main()