qemu guest agent修改密码（python）

Python代码：

"""      openstack中 虚拟机nova_db.instances.id 需转换为16进制 后补8位      http://wiki.qemu.org/Features/QAPI/GuestAgent"""import osimport sysimport jsonimport base64import cryptimport stringimport randomimport reif len(sys.argv)<3:    print('Pls input argument instance password.')    sys.exit(1)instance=sys.argv[1]pwd_=sys.argv[2]FILE_OPEN_READ="""{"execute":"guest-file-open", "arguments":{"path":"%s","mode":"r"}}"""FILE_OPEN_WRITE="""{"execute":"guest-file-open", "arguments":{"path":"%s","mode":"w+"}}"""FILE_READ="""{"execute":"guest-file-read", "arguments":{"handle":%s,"count":%d}}"""FILE_WRITE="""{"execute":"guest-file-write", "arguments":{"handle":%s,"buf-b64":"%s"}}"""FILE_CLOSE="""{"execute":"guest-file-close", "arguments":{"handle":%s}}"""def EXE(param):    cmd="""virsh qemu-agent-command %s '%s' """ % (instance,param)    #print "Exe command:%s" % cmd    stream=os.popen(cmd).read()    return None if not stream else json.loads(stream)def guestFileRead(path):    file_handle=-1    try:file_handle=EXE(FILE_OPEN_READ % path)["return"]file_content=EXE(FILE_READ % (file_handle,1024000))["return"]["buf-b64"]    except Exception,ex:print Exception,":",exreturn None    finally:EXE(FILE_CLOSE % file_handle)    return file_contentdef guestFileWrite(path,content):    file_handle=-1    try:file_handle=EXE(FILE_OPEN_WRITE % path)["return"]write_count=EXE(FILE_WRITE % (file_handle,content))["return"]["count"]    except Exception,ex:print Exception,":",exreturn -1    finally:EXE(FILE_CLOSE % file_handle)    return write_countdef genPwd(pwd):    salt=''.join(random.choice(string.ascii_letters + string.digits) for _ in range(8))    return crypt.crypt(pwd, "$6$%s" % salt)def resetPwd(path,pwd):    content=base64.standard_b64decode(guestFileRead(path))    #print "Read file content:%s" % content    user_array=re.split("\n",content)    for i,line in enumerate(user_array):info=line.split(":")if info[0]=="root":    info[1]=genPwd(pwd)    user_array[i]=":".join(info)    #print "After change,user info:%s" % user_array[i]    break    content=base64.standard_b64encode("\n".join(user_array))     write_count=guestFileWrite(path,content)    print write_count>0 resetPwd("/etc/shadow",pwd_)

     若virsh qemu-agent-command执行返回没有结果，则使用/var/lib/libvirt/qemu/下的socket文件进行通信，请参考python实例浅谈下的文章。