#!/usr/bin/python2
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2010  Joanna Rutkowska <joanna@invisiblethingslab.com>
#
# 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
#

from qubes.qubes import QubesVmCollection
from qubes.qubes import QubesException
from qubes.qubesutils import backup_prepare, backup_do_copy
from optparse import OptionParser
import os
import sys

def print_progress(progress):
    print >> sys.stderr, "\r-> Backing up files: {0}%...".format (progress),

def main():
    usage = "usage: %prog [options] <backup-dir-path>"
    parser = OptionParser (usage)

    parser.add_option ("-x", "--exclude", action="append", dest="exclude_list",
                       help="Exclude the specified VM from backup (might be repeated)")
    parser.add_option ("--force-root", action="store_true", dest="force_root", default=False,
                       help="Force to run, even with root privileges")
    parser.add_option ("-d", "--dest-vm", action="store", dest="appvm",
                       help="The AppVM to send backups to")
    parser.add_option ("-e", "--encrypt", action="store_true", dest="encrypt", default=False,
                       help="Encrypts the backup")

    (options, args) = parser.parse_args ()

    if (len (args) != 1):
        print >> sys.stderr, "You must specify the target backup directory (e.g. /mnt/backup)"
        print >> sys.stderr, "qvm-backup will create a subdirectory there for each individual backup."
        exit (0)

    base_backup_dir = args[0]

    if os.geteuid() == 0:
        if not options.force_root:
            print >> sys.stderr, "*** Running this tool as root is strongly discouraged, this will lead you in permissions problems."
            print >> sys.stderr, "Retry as unprivileged user."
            print >> sys.stderr, "... or use --force-root to continue anyway."
            exit(1)

    # Only for locking
    qvm_collection = QubesVmCollection()
    qvm_collection.lock_db_for_reading()
    qvm_collection.load()

    files_to_backup = None
    try:
        files_to_backup = backup_prepare(base_backup_dir, exclude_list=options.exclude_list)
    except QubesException as e:
        print >>sys.stderr, "ERROR: %s" % str(e)
        exit(1)

    prompt = raw_input ("Do you want to proceed? [y/N] ")
    if not (prompt == "y" or prompt == "Y"):
        exit (0)

    passphrase = raw_input("Please enter the pass phrase that will be used to encrypt/verify the backup:\n")
    passphrase = passphrase.replace("\r","").replace("\n","")

    try:
        backup_do_copy(base_backup_dir, files_to_backup, passphrase, progress_callback=print_progress, encrypt=options.encrypt,appvm=options.appvm)
    except QubesException as e:
        print >>sys.stderr, "ERROR: %s" % str(e)
        exit(1)

    print
    print "-> Backup completed."

    qvm_collection.unlock_db()
main()