# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
"""cubicweb-ctl commands and command handlers specific to the repository"""

__docformat__ = 'restructuredtext en'

# *ctl module should limit the number of import to be imported as quickly as
# possible (for cubicweb-ctl reactivity, necessary for instance for usable bash
# completion). So import locally in command helpers.
import sys
import os

from logilab.common.configuration import Configuration
from logilab.common.shellutils import ASK

from cubicweb import AuthenticationError, ExecutionError, ConfigurationError
from cubicweb.toolsutils import Command, CommandHandler, underline_title
from cubicweb.cwctl import CWCTL
from cubicweb.server import SOURCE_TYPES
from cubicweb.server.serverconfig import (USER_OPTIONS, ServerConfiguration,
                                          SourceConfiguration)

# utility functions ###########################################################

def source_cnx(source, dbname=None, special_privs=False, verbose=True):
    """open and return a connection to the system database defined in the
    given server.serverconfig
    """
    from getpass import getpass
    from logilab.database import get_connection, get_db_helper
    dbhost = source.get('db-host')
    if dbname is None:
        dbname = source['db-name']
    driver = source['db-driver']
    dbhelper = get_db_helper(driver)
    if verbose:
        print '-> connecting to %s database' % driver,
        if dbhost:
            print '%s@%s' % (dbname, dbhost),
        else:
            print dbname,
    if dbhelper.users_support:
        if not verbose or (not special_privs and source.get('db-user')):
            user = source['db-user']
            if verbose:
                print 'as', user
            if source.get('db-password'):
                password = source['db-password']
            else:
                password = getpass('password: ')
        else:
            print
            if special_privs:
                print 'WARNING'
                print ('the user will need the following special access rights '
                       'on the database:')
                print special_privs
                print
            default_user = source.get('db-user', os.environ.get('USER', ''))
            user = raw_input('Connect as user ? [%r]: ' % default_user)
            user = user or default_user
            if user == source.get('db-user') and source.get('db-password'):
                password = source['db-password']
            else:
                password = getpass('password: ')
    else:
        user = password = None
    extra_args = source.get('db-extra-arguments')
    extra = extra_args and {'extra_args': extra_args} or {}
    cnx = get_connection(driver, dbhost, dbname, user, password=password,
                         port=source.get('db-port'),
                         **extra)
    try:
        cnx.logged_user = user
    except AttributeError:
        # C object, __slots__
        from logilab.database import _SimpleConnectionWrapper
        cnx = _SimpleConnectionWrapper(cnx)
        cnx.logged_user = user
    return cnx

def system_source_cnx(source, dbms_system_base=False,
                      special_privs='CREATE/DROP DATABASE', verbose=True):
    """shortcut to get a connextion to the instance system database
    defined in the given config. If <dbms_system_base> is True,
    connect to the dbms system database instead (for task such as
    create/drop the instance database)
    """
    if dbms_system_base:
        from logilab.database import get_db_helper
        system_db = get_db_helper(source['db-driver']).system_database()
        return source_cnx(source, system_db, special_privs=special_privs, verbose=verbose)
    return source_cnx(source, special_privs=special_privs, verbose=verbose)

def _db_sys_cnx(source, what, db=None, user=None, verbose=True):
    """return a connection on the RDMS system table (to create/drop a user
    or a database
    """
    import logilab.common as lgp
    from logilab.database import get_db_helper
    lgp.USE_MX_DATETIME = False
    special_privs = ''
    driver = source['db-driver']
    helper = get_db_helper(driver)
    if user is not None and helper.users_support:
        special_privs += '%s USER' % what
    if db is not None:
        special_privs += ' %s DATABASE' % what
    # connect on the dbms system base to create our base
    cnx = system_source_cnx(source, True, special_privs=special_privs, verbose=verbose)
    # disable autocommit (isolation_level(1)) because DROP and
    # CREATE DATABASE can't be executed in a transaction
    try:
        cnx.set_isolation_level(0)
    except AttributeError:
        # set_isolation_level() is psycopg specific
        pass
    return cnx

def repo_cnx(config):
    """return a in-memory repository and a db api connection it"""
    from cubicweb.dbapi import in_memory_cnx
    from cubicweb.server.utils import manager_userpasswd
    try:
        login = config.sources()['admin']['login']
        pwd = config.sources()['admin']['password']
    except KeyError:
        login, pwd = manager_userpasswd()
    while True:
        try:
            return in_memory_cnx(config, login, password=pwd)
        except AuthenticationError:
            print '-> Error: wrong user/password.'
            # reset cubes else we'll have an assertion error on next retry
            config._cubes = None
        login, pwd = manager_userpasswd()


# repository specific command handlers ########################################

class RepositoryCreateHandler(CommandHandler):
    cmdname = 'create'
    cfgname = 'repository'

    def bootstrap(self, cubes, inputlevel=0):
        """create an instance by copying files from the given cube and by asking
        information necessary to build required configuration files
        """
        from cubicweb.server.utils import ask_source_config
        config = self.config
        print underline_title('Configuring the repository')
        config.input_config('email', inputlevel)
        # ask for pyro configuration if pyro is activated and we're not using a
        # all-in-one config, in which case this is done by the web side command
        # handler
        if config.pyro_enabled() and config.name != 'all-in-one':
            config.input_config('pyro', inputlevel)
        print '\n'+underline_title('Configuring the sources')
        sourcesfile = config.sources_file()
        # XXX hack to make Method('default_instance_id') usable in db option
        # defs (in native.py)
        sconfig = SourceConfiguration(config.appid,
                                      options=SOURCE_TYPES['native'].options)
        sconfig.adapter = 'native'
        sconfig.input_config(inputlevel=inputlevel)
        sourcescfg = {'system': sconfig}
        for cube in cubes:
            # if a source is named as the cube containing it, we need the
            # source to use the cube, so add it.
            if cube in SOURCE_TYPES:
                sourcescfg[cube] = ask_source_config(cube, inputlevel)
        print
        while ASK.confirm('Enter another source ?', default_is_yes=False):
            available = sorted(stype for stype in SOURCE_TYPES
                               if not stype in cubes)
            while True:
                sourcetype = raw_input('source type (%s): ' % ', '.join(available))
                if sourcetype in available:
                    break
                print '-> unknown source type, use one of the available types.'
            while True:
                sourceuri = raw_input('source identifier (a unique name used to tell sources apart): ').strip()
                if sourceuri != 'admin' and sourceuri not in sourcescfg:
                    break
                print '-> uri already used, choose another one.'
            sourcescfg[sourceuri] = ask_source_config(sourcetype, inputlevel)
            sourcemodule = SOURCE_TYPES[sourcetype].module
            if not sourcemodule.startswith('cubicweb.'):
                # module names look like cubes.mycube.themodule
                sourcecube = SOURCE_TYPES[sourcetype].module.split('.', 2)[1]
                # if the source adapter is coming from an external component,
                # ensure it's specified in used cubes
                if not sourcecube in cubes:
                    cubes.append(sourcecube)
        sconfig = Configuration(options=USER_OPTIONS)
        sconfig.input_config(inputlevel=inputlevel)
        sourcescfg['admin'] = sconfig
        config.write_sources_file(sourcescfg)
        # remember selected cubes for later initialization of the database
        config.write_bootstrap_cubes_file(cubes)

    def postcreate(self):
        if ASK.confirm('Run db-create to create the system database ?'):
            verbosity = (self.config.mode == 'installed') and 'y' or 'n'
            CWCTL.run(['db-create', self.config.appid, '--verbose=%s' % verbosity])
        else:
            print ('-> nevermind, you can do it later with '
                   '"cubicweb-ctl db-create %s".' % self.config.appid)


class RepositoryDeleteHandler(CommandHandler):
    cmdname = 'delete'
    cfgname = 'repository'

    def cleanup(self):
        """remove instance's configuration and database"""
        from logilab.database import get_db_helper
        source = self.config.sources()['system']
        dbname = source['db-name']
        helper = get_db_helper(source['db-driver'])
        if ASK.confirm('Delete database %s ?' % dbname):
            user = source['db-user'] or None
            cnx = _db_sys_cnx(source, 'DROP DATABASE', user=user)
            cursor = cnx.cursor()
            try:
                cursor.execute('DROP DATABASE %s' % dbname)
                print '-> database %s dropped.' % dbname
                # XXX should check we are not connected as user
                if user and helper.users_support and \
                       ASK.confirm('Delete user %s ?' % user, default_is_yes=False):
                    cursor.execute('DROP USER %s' % user)
                    print '-> user %s dropped.' % user
                cnx.commit()
            except:
                cnx.rollback()
                raise


class RepositoryStartHandler(CommandHandler):
    cmdname = 'start'
    cfgname = 'repository'

    def start_server(self, config):
        command = ['cubicweb-ctl start-repository ']
        if config.debugmode:
            command.append('--debug')
        command.append('--loglevel %s' % config['log-threshold'].lower())
        command.append(config.appid)
        os.system(' '.join(command))


class RepositoryStopHandler(CommandHandler):
    cmdname = 'stop'
    cfgname = 'repository'

    def poststop(self):
        """if pyro is enabled, ensure the repository is correctly unregistered
        """
        if self.config.pyro_enabled():
            from cubicweb.server.repository import pyro_unregister
            pyro_unregister(self.config)


# repository specific commands ################################################

def createdb(helper, source, dbcnx, cursor, **kwargs):
    if dbcnx.logged_user != source['db-user']:
        helper.create_database(cursor, source['db-name'], source['db-user'],
                               source['db-encoding'], **kwargs)
    else:
        helper.create_database(cursor, source['db-name'],
                               dbencoding=source['db-encoding'], **kwargs)

class CreateInstanceDBCommand(Command):
    """Create the system database of an instance (run after 'create').

    You will be prompted for a login / password to use to connect to
    the system database.  The given user should have almost all rights
    on the database (ie a super user on the dbms allowed to create
    database, users, languages...).

    <instance>
      the identifier of the instance to initialize.
    """
    name = 'db-create'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('create-db',
         {'short': 'c', 'type': 'yn', 'metavar': '<y or n>',
          'default': True,
          'help': 'create the database (yes by default)'}),
        ('verbose',
         {'short': 'v', 'type' : 'yn', 'metavar': '<verbose>',
          'default': 'n',
          'help': 'verbose mode: will ask all possible configuration questions',
          }
         ),
        ('automatic',
         {'short': 'a', 'type' : 'yn', 'metavar': '<auto>',
          'default': 'n',
          'help': 'automatic mode: never ask and use default answer to every question',
          }
         ),
        )
    def run(self, args):
        """run the command with its specific arguments"""
        from logilab.database import get_db_helper
        verbose = self.get('verbose')
        automatic = self.get('automatic')
        appid = args.pop()
        config = ServerConfiguration.config_for(appid)
        source = config.sources()['system']
        dbname = source['db-name']
        driver = source['db-driver']
        helper = get_db_helper(driver)
        if driver == 'sqlite':
            if os.path.exists(dbname) and (
                automatic or
                ASK.confirm('Database %s already exists. Drop it?' % dbname)):
                os.unlink(dbname)
        elif self.config.create_db:
            print '\n'+underline_title('Creating the system database')
            # connect on the dbms system base to create our base
            dbcnx = _db_sys_cnx(source, 'CREATE DATABASE and / or USER', verbose=verbose)
            cursor = dbcnx.cursor()
            try:
                if helper.users_support:
                    user = source['db-user']
                    if not helper.user_exists(cursor, user) and (automatic or \
                           ASK.confirm('Create db user %s ?' % user, default_is_yes=False)):
                        helper.create_user(source['db-user'], source['db-password'])
                        print '-> user %s created.' % user
                if dbname in helper.list_databases(cursor):
                    if automatic or ASK.confirm('Database %s already exists -- do you want to drop it ?' % dbname):
                        cursor.execute('DROP DATABASE %s' % dbname)
                    else:
                        return
                createdb(helper, source, dbcnx, cursor)
                dbcnx.commit()
                print '-> database %s created.' % dbname
            except:
                dbcnx.rollback()
                raise
        cnx = system_source_cnx(source, special_privs='LANGUAGE C', verbose=verbose)
        cursor = cnx.cursor()
        helper.init_fti_extensions(cursor)
        # postgres specific stuff
        if driver == 'postgres':
            # install plpythonu/plpgsql language if not installed by the cube
            langs = sys.platform == 'win32' and ('plpgsql',) or ('plpythonu', 'plpgsql')
            for extlang in langs:
                helper.create_language(cursor, extlang)
        cursor.close()
        cnx.commit()
        print '-> database for instance %s created and necessary extensions installed.' % appid
        print
        if automatic or ASK.confirm('Run db-init to initialize the system database ?'):
            CWCTL.run(['db-init', config.appid])
        else:
            print ('-> nevermind, you can do it later with '
                   '"cubicweb-ctl db-init %s".' % config.appid)


class InitInstanceCommand(Command):
    """Initialize the system database of an instance (run after 'db-create').

    You will be prompted for a login / password to use to connect to
    the system database.  The given user should have the create tables,
    and grant permissions.

    <instance>
      the identifier of the instance to initialize.
    """
    name = 'db-init'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('drop',
         {'short': 'd', 'action': 'store_true',
          'default': False,
          'help': 'insert drop statements to remove previously existant \
tables, indexes... (no by default)'}),
        )

    def run(self, args):
        print '\n'+underline_title('Initializing the system database')
        from cubicweb.server import init_repository
        from logilab.database import get_connection
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        try:
            system = config.sources()['system']
            extra_args=system.get('db-extra-arguments')
            extra = extra_args and {'extra_args': extra_args} or {}
            get_connection(
                system['db-driver'], database=system['db-name'],
                host=system.get('db-host'), port=system.get('db-port'),
                user=system.get('db-user'), password=system.get('db-password'),
                **extra)
        except Exception, ex:
            raise ConfigurationError(
                'You seem to have provided wrong connection information in '\
                'the %s file. Resolve this first (error: %s).'
                % (config.sources_file(), str(ex).strip()))
        init_repository(config, drop=self.config.drop)


class GrantUserOnInstanceCommand(Command):
    """Grant a database user on a repository system database.

    <instance>
      the identifier of the instance
    <user>
      the database's user requiring grant access
    """
    name = 'db-grant-user'
    arguments = '<instance> <user>'
    min_args = max_args = 2
    options = (
        ('set-owner',
         {'short': 'o', 'type' : 'yn', 'metavar' : '<yes or no>',
          'default' : False,
          'help': 'Set the user as tables owner if yes (no by default).'}
         ),
        )
    def run(self, args):
        """run the command with its specific arguments"""
        from cubicweb.server.sqlutils import sqlexec, sqlgrants
        appid, user = args
        config = ServerConfiguration.config_for(appid)
        source = config.sources()['system']
        set_owner = self.config.set_owner
        cnx = system_source_cnx(source, special_privs='GRANT')
        cursor = cnx.cursor()
        schema = config.load_schema()
        try:
            sqlexec(sqlgrants(schema, source['db-driver'], user,
                              set_owner=set_owner), cursor)
        except Exception, ex:
            cnx.rollback()
            import traceback
            traceback.print_exc()
            print '-> an error occurred:', ex
        else:
            cnx.commit()
            print '-> rights granted to %s on instance %s.' % (appid, user)


class ResetAdminPasswordCommand(Command):
    """Reset the administrator password.

    <instance>
      the identifier of the instance
    """
    name = 'reset-admin-pwd'
    arguments = '<instance>'

    def run(self, args):
        """run the command with its specific arguments"""
        from cubicweb.server.utils import crypt_password, manager_userpasswd
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        sourcescfg = config.read_sources_file()
        try:
            adminlogin = sourcescfg['admin']['login']
        except KeyError:
            print '-> Error: could not get cubicweb administrator login.'
            sys.exit(1)
        cnx = source_cnx(sourcescfg['system'])
        cursor = cnx.cursor()
        # check admin exists
        cursor.execute("SELECT * FROM cw_CWUser WHERE cw_login=%(l)s",
                       {'l': adminlogin})
        if not cursor.fetchall():
            print ("-> error: admin user %r specified in sources doesn't exist "
                   "in the database" % adminlogin)
            print "   fix your sources file before running this command"
            cnx.close()
            sys.exit(1)
        # ask for a new password
        _, passwd = manager_userpasswd(adminlogin, confirm=True,
                                       passwdmsg='new password for %s' % adminlogin)
        try:
            cursor.execute("UPDATE cw_CWUser SET cw_upassword=%(p)s WHERE cw_login=%(l)s",
                           {'p': crypt_password(passwd), 'l': adminlogin})
            sconfig = Configuration(options=USER_OPTIONS)
            sconfig['login'] = adminlogin
            sconfig['password'] = passwd
            sourcescfg['admin'] = sconfig
            config.write_sources_file(sourcescfg)
        except Exception, ex:
            cnx.rollback()
            import traceback
            traceback.print_exc()
            print '-> an error occurred:', ex
        else:
            cnx.commit()
            print '-> password reset, sources file regenerated.'
        cnx.close()


class StartRepositoryCommand(Command):
    """Start an CubicWeb RQL server for a given instance.

    The server will be accessible through pyro

    <instance>
      the identifier of the instance to initialize.
    """
    name = 'start-repository'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('debug',
         {'short': 'D', 'action' : 'store_true',
          'help': 'start server in debug mode.'}),
        ('loglevel',
         {'short': 'l', 'type' : 'choice', 'metavar': '<log level>',
          'default': None, 'choices': ('debug', 'info', 'warning', 'error'),
          'help': 'debug if -D is set, error otherwise',
          }),
        )

    def run(self, args):
        from logilab.common.daemon import daemonize
        from cubicweb.cwctl import init_cmdline_log_threshold
        from cubicweb.server.server import RepositoryServer
        appid = args[0]
        debug = self['debug']
        if sys.platform == 'win32' and not debug:
            from logging import getLogger
            logger = getLogger('cubicweb.ctl')
            logger.info('Forcing debug mode on win32 platform')
            debug = True
        config = ServerConfiguration.config_for(appid, debugmode=debug)
        init_cmdline_log_threshold(config, self['loglevel'])
        # create the server
        server = RepositoryServer(config)
        # ensure the directory where the pid-file should be set exists (for
        # instance /var/run/cubicweb may be deleted on computer restart)
        pidfile = config['pid-file']
        piddir = os.path.dirname(pidfile)
        # go ! (don't daemonize in debug mode)
        if not os.path.exists(piddir):
            os.makedirs(piddir)
        if not debug and daemonize(pidfile):
            return
        uid = config['uid']
        if uid is not None:
            try:
                uid = int(uid)
            except ValueError:
                from pwd import getpwnam
                uid = getpwnam(uid).pw_uid
            os.setuid(uid)
        server.install_sig_handlers()
        server.connect(config['host'], 0)
        server.run()


def _remote_dump(host, appid, output, sudo=False):
    # XXX generate unique/portable file name
    from datetime import date
    filename = '%s-%s.tgz' % (appid, date.today().strftime('%Y-%m-%d'))
    dmpcmd = 'cubicweb-ctl db-dump -o /tmp/%s %s' % (filename, appid)
    if sudo:
        dmpcmd = 'sudo %s' % (dmpcmd)
    dmpcmd = 'ssh -t %s "%s"' % (host, dmpcmd)
    print dmpcmd
    if os.system(dmpcmd):
        raise ExecutionError('Error while dumping the database')
    if output is None:
        output = filename
    cmd = 'scp %s:/tmp/%s %s' % (host, filename, output)
    print cmd
    if os.system(cmd):
        raise ExecutionError('Error while retrieving the dump at /tmp/%s' % filename)
    rmcmd = 'ssh -t %s "rm -f /tmp/%s"' % (host, filename)
    print rmcmd
    if os.system(rmcmd) and not ASK.confirm(
        'An error occurred while deleting remote dump at /tmp/%s. '
        'Continue anyway?' % filename):
        raise ExecutionError('Error while deleting remote dump at /tmp/%s' % filename)

def _local_dump(appid, output):
    config = ServerConfiguration.config_for(appid)
    config.quick_start = True
    mih = config.migration_handler(connect=False, verbosity=1)
    mih.backup_database(output, askconfirm=False)
    mih.shutdown()

def _local_restore(appid, backupfile, drop, systemonly=True):
    config = ServerConfiguration.config_for(appid)
    config.verbosity = 1 # else we won't be asked for confirmation on problems
    config.quick_start = True
    mih = config.migration_handler(connect=False, verbosity=1)
    mih.restore_database(backupfile, drop, systemonly, askconfirm=False)
    repo = mih.repo_connect()
    # version of the database
    dbversions = repo.get_versions()
    mih.shutdown()
    if not dbversions:
        print "bad or missing version information in the database, don't upgrade file system"
        return
    # version of installed software
    eversion = dbversions['cubicweb']
    status = instance_status(config, eversion, dbversions)
    # * database version > installed software
    if status == 'needsoftupgrade':
        print "** The database of %s is more recent than the installed software!" % config.appid
        print "** Upgrade your software, then migrate the database by running the command"
        print "** 'cubicweb-ctl upgrade %s'" % config.appid
        return
    # * database version < installed software, an upgrade will be necessary
    #   anyway, just rewrite vc.conf and warn user he has to upgrade
    elif status == 'needapplupgrade':
        print "** The database of %s is older than the installed software." % config.appid
        print "** Migrate the database by running the command"
        print "** 'cubicweb-ctl upgrade %s'" % config.appid
        return
    # * database version = installed software, database version = instance fs version
    #   ok!

def instance_status(config, cubicwebapplversion, vcconf):
    cubicwebversion = config.cubicweb_version()
    if cubicwebapplversion > cubicwebversion:
        return 'needsoftupgrade'
    if cubicwebapplversion < cubicwebversion:
        return 'needapplupgrade'
    for cube in config.cubes():
        try:
            softversion = config.cube_version(cube)
        except ConfigurationError:
            print '-> Error: no cube version information for %s, please check that the cube is installed.' % cube
            continue
        try:
            applversion = vcconf[cube]
        except KeyError:
            print '-> Error: no cube version information for %s in version configuration.' % cube
            continue
        if softversion == applversion:
            continue
        if softversion > applversion:
            return 'needsoftupgrade'
        elif softversion < applversion:
            return 'needapplupgrade'
    return None


class DBDumpCommand(Command):
    """Backup the system database of an instance.

    <instance>
      the identifier of the instance to backup
      format [[user@]host:]appname
    """
    name = 'db-dump'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('output',
         {'short': 'o', 'type' : 'string', 'metavar' : '<file>',
          'default' : None,
          'help': 'Specify the backup file where the backup will be stored.'}
         ),
        ('sudo',
         {'short': 's', 'action' : 'store_true',
          'default' : False,
          'help': 'Use sudo on the remote host.'}
         ),
        )

    def run(self, args):
        appid = args[0]
        if ':' in appid:
            host, appid = appid.split(':')
            _remote_dump(host, appid, self.config.output, self.config.sudo)
        else:
            _local_dump(appid, self.config.output)


class DBRestoreCommand(Command):
    """Restore the system database of an instance.

    <instance>
      the identifier of the instance to restore
    """
    name = 'db-restore'
    arguments = '<instance> <backupfile>'
    min_args = max_args = 2

    options = (
        ('no-drop',
         {'short': 'n', 'action' : 'store_true', 'default' : False,
          'help': 'for some reason the database doesn\'t exist and so '
          'should not be dropped.'}
         ),
        ('restore-all',
         {'short': 'r', 'action' : 'store_true', 'default' : False,
          'help': 'restore everything, eg not only the system source database '
          'but also data for all sources supporting backup/restore and custom '
          'instance data. In that case, <backupfile> is expected to be the '
          'timestamp of the backup to restore, not a file'}
         ),
        )

    def run(self, args):
        appid, backupfile = args
        _local_restore(appid, backupfile,
                       drop=not self.config.no_drop,
                       systemonly=not self.config.restore_all)


class DBCopyCommand(Command):
    """Copy the system database of an instance (backup and restore).

    <src-instance>
      the identifier of the instance to backup
      format [[user@]host:]appname

    <dest-instance>
      the identifier of the instance to restore
    """
    name = 'db-copy'
    arguments = '<src-instance> <dest-instance>'
    min_args = max_args = 2
    options = (
        ('no-drop',
         {'short': 'n', 'action' : 'store_true',
          'default' : False,
          'help': 'For some reason the database doesn\'t exist and so '
          'should not be dropped.'}
         ),
        ('keep-dump',
         {'short': 'k', 'action' : 'store_true',
          'default' : False,
          'help': 'Specify that the dump file should not be automatically removed.'}
         ),
        ('sudo',
         {'short': 's', 'action' : 'store_true',
          'default' : False,
          'help': 'Use sudo on the remote host.'}
         ),
        )

    def run(self, args):
        import tempfile
        srcappid, destappid = args
        fd, output = tempfile.mkstemp()
        os.close(fd)
        if ':' in srcappid:
            host, srcappid = srcappid.split(':')
            _remote_dump(host, srcappid, output, self.config.sudo)
        else:
            _local_dump(srcappid, output)
        _local_restore(destappid, output, not self.config.no_drop)
        if self.config.keep_dump:
            print '-> you can get the dump file at', output
        else:
            os.remove(output)


class CheckRepositoryCommand(Command):
    """Check integrity of the system database of an instance.

    <instance>
      the identifier of the instance to check
    """
    name = 'db-check'
    arguments = '<instance>'
    min_args = max_args = 1
    options = (
        ('checks',
         {'short': 'c', 'type' : 'csv', 'metavar' : '<check list>',
          'default' : ('entities', 'relations', 'metadata', 'schema', 'text_index'),
          'help': 'Comma separated list of check to run. By default run all \
checks, i.e. entities, relations, text_index and metadata.'}
         ),

        ('autofix',
         {'short': 'a', 'type' : 'yn', 'metavar' : '<yes or no>',
          'default' : False,
          'help': 'Automatically correct integrity problems if this option \
is set to "y" or "yes", else only display them'}
         ),
        ('reindex',
         {'short': 'r', 'type' : 'yn', 'metavar' : '<yes or no>',
          'default' : False,
          'help': 're-indexes the database for full text search if this \
option is set to "y" or "yes" (may be long for large database).'}
         ),
        ('force',
         {'short': 'f', 'action' : 'store_true',
          'default' : False,
          'help': 'don\'t check instance is up to date.'}
         ),

        )

    def run(self, args):
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        config.repairing = self.config.force
        repo, cnx = repo_cnx(config)
        check(repo, cnx,
              self.config.checks, self.config.reindex, self.config.autofix)


class RebuildFTICommand(Command):
    """Rebuild the full-text index of the system database of an instance.

    <instance>
      the identifier of the instance to rebuild
    """
    name = 'db-rebuild-fti'
    arguments = '<instance>'
    min_args = max_args = 1

    def run(self, args):
        from cubicweb.server.checkintegrity import reindex_entities
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        repo, cnx = repo_cnx(config)
        session = repo._get_session(cnx.sessionid, setpool=True)
        reindex_entities(repo.schema, session)
        cnx.commit()


class SynchronizeInstanceSchemaCommand(Command):
    """Synchronize persistent schema with cube schema.

    Will synchronize common stuff between the cube schema and the
    actual persistent schema, but will not add/remove any entity or relation.

    <instance>
      the identifier of the instance to synchronize.
    """
    name = 'schema-sync'
    arguments = '<instance>'
    min_args = max_args = 1

    def run(self, args):
        appid = args[0]
        config = ServerConfiguration.config_for(appid)
        mih = config.migration_handler()
        mih.cmd_synchronize_schema()


class CheckMappingCommand(Command):
    """Check content of the mapping file of an external source.

    The mapping is checked against the instance's schema, searching for
    inconsistencies or stuff you may have forgotten. It's higly recommanded to
    run it when you setup a multi-sources instance.

    <instance>
      the identifier of the instance.

    <mapping file>
      the mapping file to check.
    """
    name = 'check-mapping'
    arguments = '<instance> <mapping file>'
    min_args = max_args = 2

    def run(self, args):
        from cubicweb.server.checkintegrity import check_mapping
        from cubicweb.server.sources.pyrorql import load_mapping_file
        appid, mappingfile = args
        config = ServerConfiguration.config_for(appid)
        config.quick_start = True
        mih = config.migration_handler(connect=False, verbosity=1)
        repo = mih.repo_connect() # necessary to get cubes
        check_mapping(config.load_schema(), load_mapping_file(mappingfile))

for cmdclass in (CreateInstanceDBCommand, InitInstanceCommand,
                 GrantUserOnInstanceCommand, ResetAdminPasswordCommand,
                 StartRepositoryCommand,
                 DBDumpCommand, DBRestoreCommand, DBCopyCommand,
                 CheckRepositoryCommand, RebuildFTICommand,
                 SynchronizeInstanceSchemaCommand,
                 CheckMappingCommand,
                 ):
    CWCTL.register(cmdclass)
