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#!/usr/bin/python3 """Tool for manipulating the nfsdcld sqlite database """ __copyright__ = """ Copyright (C) 2019 Scott Mayhew <smayhew@redhat.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. """ import argparse import os import sqlite3 import sys class CldDb(): def __init__(self, path): self.con = sqlite3.connect(path) self.con.row_factory = sqlite3.Row for row in self.con.execute('select value from parameters ' 'where key = "version"'): self.version = int(row['value']) for row in self.con.execute('select * from grace'): self.current = int(row['current']) self.recovery = int(row['recovery']) def __del__(self): self.con.close() def __str__(self): return ('Schema version: {self.version} ' 'current epoch: {self.current} ' 'recovery epoch: {self.recovery}'.format(self=self)) def _print_clients(self, epoch): if epoch: for row in self.con.execute('select * from "rec-{:016x}"' .format(epoch)): if self.version >= 4: if row['princhash'] is not None: princhash = row['princhash'].hex() else: princhash = "(null)" print('id = {}, princhash = {}' .format(row['id'].decode(), princhash)) else: print('id = {}'.format(row['id'].decode())) def print_current_clients(self): print('Clients in current epoch:') self._print_clients(self.current) def print_recovery_clients(self): if self.recovery: print('Clients in recovery epoch:') self._print_clients(self.recovery) def check_bad_table_names(self): bad_names = [] for row in self.con.execute('select name from sqlite_master ' 'where type = "table" ' 'and name like "%rec-%" ' 'and length(name) < 20'): bad_names.append(row['name']) return bad_names def fix_bad_table_names(self): try: self.con.execute('begin exclusive transaction') bad_names = self.check_bad_table_names() for bad_name in bad_names: epoch = int(bad_name.split('-')[1], base=16) if epoch == self.current or epoch == self.recovery: if epoch == self.current: which = 'current' else: which = 'recovery' print('found invalid table name {} for {} epoch' .format(bad_name, which)) self.con.execute('alter table "{}" ' 'rename to "rec-{:016x}"' .format(bad_name, epoch)) print('renamed to rec-{:016x}'.format(epoch)) else: print('found invalid table name {} for unknown epoch {}' .format(bad_name, epoch)) self.con.execute('drop table "{}"'.format(bad_name)) print('dropped table {}'.format(bad_name)) except sqlite3.Error: self.con.rollback() else: self.con.commit() def has_princ_data(self): if self.version < 4: return False for row in self.con.execute('select count(*) ' 'from "rec-{:016x}" ' 'where princhash not null' .format(self.current)): count = row[0] if self.recovery: for row in self.con.execute('select count(*) ' 'from "rec-{:016x}" ' 'where princhash not null' .format(self.current)): count = count + row[0] if count: return True return False def _downgrade_table_v4_to_v3(self, epoch): if not self.con.in_transaction: raise sqlite3.Error try: self.con.execute('create table "new_rec-{:016x}" ' '(id blob primary key)'.format(epoch)) self.con.execute('insert into "new_rec-{:016x}" ' 'select id from "rec-{:016x}"' .format(epoch, epoch)) self.con.execute('drop table "rec-{:016x}"'.format(epoch)) self.con.execute('alter table "new_rec-{:016x}" ' 'rename to "rec-{:016x}"' .format(epoch, epoch)) except sqlite3.Error: raise def downgrade_schema_v4_to_v3(self): try: self.con.execute('begin exclusive transaction') for row in self.con.execute('select value from parameters ' 'where key = "version"'): version = int(row['value']) if version != self.version: raise sqlite3.Error for row in self.con.execute('select * from grace'): current = int(row['current']) recovery = int(row['recovery']) if current != self.current: raise sqlite3.Error if recovery != self.recovery: raise sqlite3.Error self._downgrade_table_v4_to_v3(current) if recovery: self._downgrade_table_v4_to_v3(recovery) self.con.execute('update parameters ' 'set value = "3" ' 'where key = "version"') self.version = 3 except sqlite3.Error: self.con.rollback() print('Downgrade failed') else: self.con.commit() print('Downgrade successful') def nfsdcld_active(): rc = os.system('ps -C nfsdcld >/dev/null 2>/dev/null') if rc == 0: return True return False def fix_table_names_command(db, args): if nfsdcld_active(): print('Warning: nfsdcld is running!') ans = input('Continue? ') if ans.lower() not in ['y', 'yes']: print('Operation canceled.') return bad_names = db.check_bad_table_names() if not bad_names: print('No invalid table names found.') return db.fix_bad_table_names() def downgrade_schema_command(db, args): if nfsdcld_active(): print('Warning: nfsdcld is running!') ans = input('Continue? ') if ans.lower() not in ['y', 'yes']: print('Operation canceled') return if db.version != 4: print('Cannot downgrade database from schema version {}.' .format(db.version)) return if args.version != 3: print('Cannot downgrade to version {}.'.format(args.version)) return bad_names = db.check_bad_table_names() if bad_names: print('Invalid table names detected.') print('Please run "{} fix-table-names" before downgrading the schema.' .format(sys.argv[0])) return if db.has_princ_data(): print('Warning: database has principal data, which will be erased.') ans = input('Continue? ') if ans.lower() not in ['y', 'yes']: print('Operation canceled') return db.downgrade_schema_v4_to_v3() def print_command(db, args): print(str(db)) if not args.summary: bad_names = db.check_bad_table_names() if bad_names: print('Invalid table names detected.') print('Please run "{} fix-table-names".'.format(sys.argv[0])) return db.print_current_clients() db.print_recovery_clients() def main(): parser = argparse.ArgumentParser() parser.add_argument('-p', '--path', default='/var/lib/nfs/nfsdcld/main.sqlite', help='path to the database ' '(default: /var/lib/nfs/nfsdcld/main.sqlite)') subparsers = parser.add_subparsers(help='sub-command help') fix_parser = subparsers.add_parser('fix-table-names', help='fix invalid table names') fix_parser.set_defaults(func=fix_table_names_command) downgrade_parser = subparsers.add_parser('downgrade-schema', help='downgrade database schema') downgrade_parser.add_argument('-v', '--version', type=int, choices=[3], default=3, help='version to downgrade to') downgrade_parser.set_defaults(func=downgrade_schema_command) print_parser = subparsers.add_parser('print', help='print database info') print_parser.add_argument('-s', '--summary', default=False, action='store_true', help='print summary only') print_parser.set_defaults(func=print_command) args = parser.parse_args() if not os.path.exists(args.path): return parser.print_usage() clddb = CldDb(args.path) return args.func(clddb, args) if __name__ == '__main__': if len(sys.argv) == 1: sys.argv.extend(['print', '--summary']) main()