how to extend FileSystem class using Migrate method (cutover ..)

[SM REF]

SM REF [http://community.zenoss.org/people/sighBemuch] created the discussion

"how to extend FileSystem class using Migrate method (cutover ..)"

To view the discussion, visit: http://community.zenoss.org/message/70914#70914

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Hi,

In order to bypass the usedBlocks problem, i want to extend the FileSystem class by using the migrate method

class FileSystemXXX(Migrate.Step):
    version = Migrate.Version(1, 12, 1)
    def cutover(self,FileSystem,Device):
        pass
    def getDfLine(self):
        hd=self.name()
        hostdev=self.getManageIp()
        #snmpDfCmd="snmpdf -v1 -cpublic "+hostdev+" |grep -w "+'"'+hd+'"'
        snmpDfCmd="ssh SSHUSER http://community.zenoss.org/mailto:SSHUSER@"+hostdev @"+hostdev+" df -k |grep -v \/proc |grep -w "+'"'+hd+'"'
        line="".join(os.popen(snmpDfCmd,"r").readlines())
        if line!="":
                return line
        return None
    #extraction du avalaible
    def getFreeKBytes(self):
        line= self.getDfLine()
        if line is not None:
                #3 pour snmpdf
                fb=int(line.split()[2])
                return fb
        return None
    # extraction du avalaible
    def getTotalKBytes(self):
        line=self.getDfLine()
        if line is not None:
                tb=int(line.split()[1])
                return tb
        return None
    #calcul de used
    def getUsedKBlocks(self):
        tK=self.getTotalKBytes()
        tF=self.getFreeKBytes()
        if tK is not None and tF is not None:
                        ub=int(tK - tF)
                        return ub
        return None
    def capacityBis(self):
        line= self.getDfLine()
        if line is not None:
                c=line.split()[3].split('%')[0]
                return c is None and "unknown" or int(c)
        return None
    def usedBlocks():
        uKbytes=self.getUsedKBlocks()
        return uKbytes is None and "unknown" or uKbytes
    #FinLCL

FileSystemXXX

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for f in DEVICE.os.filesystems():
     print capacityBis()

I have this error:
line 49, in <module>
    print f.capacityBis()
AttributeError: capacityBis


What's wrong extendind FileSystem class ?

Thank's for help



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