Python DB.delete_run_versions方法代码示例

# 需要导入模块: from lib.db import DB [as 别名]
# 或者: from lib.db.DB import delete_run_versions [as 别名]
class Run():
    def __init__(self, name, type, options):
        '''
        Prepare to run a backup event
        
        @param name: name of the backup
        @param type: type (Full/Incr)
        @param type: dry_run
        
        If dry_run is True, then we will print the files we *would have* backed
        up to stdout.
        
        '''
        self.type = type
        self.dry_run = options.dry_run
        self.options = options
        self.config = Config.get_config()

        try:
            self.backup = self.config.backups[name]
        except:
            raise Exception(_("Backup is missing or corrupt. Please reconfigure backup."))

        try:
            #    Get a fresh store (a copy of the config version
            self.store = self.config.storage[self.backup.store].copy()
        except:
            raise Exception(_("Storage definition is missing. Please reconfigure backup."))

        self.db = DB()
        self.start_time = None
        self.nfiles = None
        self.nfolders = None
        self.bytes = None
        self.run_id = None
        self.backup_folder = None

        #    Make sure there are no other backups running of this name
        self.lock = locking.InterProcessLock(name="Vault-%s" % self.backup.name)

        #    Build a quick file exclusion list, to speed up exclusion checking
        self.excl_ext = self.build_excl_exts()
        log.debug("Exclusion List:", ",".join(self.excl_ext))


    def run(self):
        '''
        Execute the backup
        '''
        try:
            self.lock.acquire()
        except:
            msg = _("Backup '%s' is already running. New backup run cannot start") \
                    % (self.backup.name)

            if not self.dry_run:
                #    Since this is a real backup, we create the run, write to the log and fail immediately.
                self.db.start_run(self.backup.name, self.backup.store, self.type, datetime.now())
                self.db.save_message(msg)
                self.db.update_run_status(const.StatusFailed)
            else:
                #    We dont need to do anything for a dry run. The message will
                #    be returned to the user.
                pass
            raise Exception(msg)

        #    We have the lock now...
        try:
            self.orig_type = self.type
            self.check_old_backups()
            self.do_backup()
        finally:
            self.lock.release()

    def check_old_backups(self):
        '''
        We have got the lock, but if there was a crash, there may be a "running"
        state backup left behind. Note that we *know* its not running because
        the lock is gone.
        
        Check for it and fail it if there is.
        '''
        log.debug("Checking for dead backups")
        runs = self.db.runs(self.backup.name)
        runs = [run for run in runs if run.status == const.StatusRunning]

        #    It looks like there is a run that is still running.
        for run in runs:
            log.warn("A prior run crashed. Cleaning up %s/%s" % (run.name, run.start_time_str))
            #    Get the store
            log.debug("Attempting to delete remote run data")
            try:
                self.store.delete_run_data(run)
            except:
                pass
            #    Delete the entries in the database (but not the failed run itself)
            #    This means the messages will persist, so we can see the usage.
            log.debug("Attempting to delete DB run data")
            self.db.delete_run_versions(self.run_id)
            #    Update the status
#.........这里部分代码省略.........