sros md-cli: premature end when issuing command

[nskalis]

Hi,

And thank you for making unicon available. I encountered an issue when trying to dump the configuration of a sros router using md-cli. More specifically,

• the connection object is defined like:

uni_conn = unicon.Connection(
    hostname="some-name",
    os="sros",
    start=["{} {}".format("ssh", "x.x.x.x")],
    learn_hostname=True,
    credentials={
        "default": {
            "username": os.environ["NETWORK_USERNAME"],
            "password": os.environ["NETWORK_PASSWORD"],
        }
    },
    init_config_commands=[],
    log_stdout=True,
    debug=True,
    connection_timeout=10,
    overwrite_settings=False,
    settings={"DEFAULT_CLI_ENGINE": "mdcli"},
)

• The command issued is: (the purpose is to dump the router's configuration)

uni_conn.execute("admin show configuration flat | no-more", timeout=10)

• But, the output stops being produced, the last lines look like this:

...
    configure { policy-options as-path-group "BOGON_ASNS_IN" }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 1 }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 1 expression ".* 0 .*" }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 2 }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 2 expression ".* 23456 .*" }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 3 }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 3 expression ".*

While the router's configuration is:

...
    configure { policy-options as-path-group "BOGON_ASNS_IN" }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 1 }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 1 expression ".* 0 .*" }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 2 }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 2 expression ".* 23456 .*" }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 3 }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 3 expression ".* [64496-64511] .*" }
    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 4 }
...

It seems there is a problem with the [ character.

• What the debug option prints out is:

\r\n    configure { policy-options as-path-group "BOGON_ASNS_IN" }\r\n    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 1 }\r\n    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 1 expression ".* 0 .*" }\r\n    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 2 }\r\n    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 2 expression ".* 23456 .*" }\r\n    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 3 }\r\n    configure { policy-options as-path-group "BOGON_ASNS_IN" entry 3 expression ".* ',)


2022-10-29 19:46:43,132: %UNICON-DEBUG: Statement matched: '[pattern='^(.*?)\[.*\][\r\n]+[AB]:.*@some-name#\s?$', action=None, args=None, loop_continue=False, continue_timer=False, trim_buffer=True]'
2022-10-29 19:46:43,206: %UNICON-DEBUG: Statement matched: '[pattern='^(.*?)\[.*\][\r\n]+[AB]:.*@some-name#\s?$', action=None, args=None, loop_continue=False, continue_timer=False, trim_buffer=True]'
2022-10-29 19:46:43,211: %UNICON-DEBUG: >>> Unicon Sending (target=some-name):: '\r'
2022-10-29 19:46:43,229: %UNICON-DEBUG: <<< Unicon Got (target=some-name):: '\r\n'
2022-10-29 19:46:43,229: %UNICON-DEBUG: *** Pattern List (target=some-name):: 
2022-10-29 19:46:43,229: %UNICON-DEBUG: 	'.+$'
2022-10-29 19:46:43,230: %UNICON-DEBUG: 
2022-10-29 19:46:43,230: %UNICON-DEBUG: *** Pattern Matched (target=some-name):: '.+$'
2022-10-29 19:46:43,230: %UNICON-DEBUG: <unicon.eal.MatchMode mode_id=0, mode_name='search multi-line re.S'>
2022-10-29 19:46:43,230: %UNICON-DEBUG: 
[]
A:user_awesome@some-name# 
2022-10-29 19:46:43,230: %UNICON-DEBUG: <<< Unicon Got (target=some-name):: '\r\n\r\n[]\r\nA:user_awesome@some-name# '
2022-10-29 19:46:43,230: %UNICON-DEBUG: *** Pattern List (target=some-name):: 
2022-10-29 19:46:43,230: %UNICON-DEBUG: 	'^(.*?)\\*?[AB]:some-name(>.*)?#\\s?$'
2022-10-29 19:46:43,230: %UNICON-DEBUG: 	'^(.*?)\\[.*\\][\\r\\n]+[AB]:.*@some-name#\\s?$'
2022-10-29 19:46:43,230: %UNICON-DEBUG: 
2022-10-29 19:46:43,230: %UNICON-DEBUG: *** Pattern Matched (target=some-name):: '^(.*?)\\[.*\\][\\r\\n]+[AB]:.*@some-name#\\s?$'
2022-10-29 19:46:43,230: %UNICON-DEBUG: <unicon.eal.MatchMode mode_id=0, mode_name='search multi-line re.S'>
2022-10-29 19:46:43,230: %UNICON-DEBUG: *** Match Groups:: ('\r\n\r\n',)
2022-10-29 19:46:43,230: %UNICON-DEBUG: Statement matched: '[pattern='^(.*?)\[.*\][\r\n]+[AB]:.*@some-name#\s?$', action=update_cur_state, args={'transition': <unicon.statemachine.statetransition.AnyStateTransition object at 0x7f4e9ffa94f0>, 'state': mdcli}, loop_continue=False, continue_timer=False, trim_buffer=True]'
2022-10-29 19:46:43,237: %UNICON-DEBUG: >>> Unicon Sending (target=some-name):: '\x1a'
[]
A:user_awesome@some-name# 
2022-10-29 19:46:43,259: %UNICON-DEBUG: <<< Unicon Got (target=some-name):: '\r\n\r\n[]\r\nA:user_awesome@some-name# '
2022-10-29 19:46:43,259: %UNICON-DEBUG: *** Pattern List (target=some-name):: 
2022-10-29 19:46:43,259: %UNICON-DEBUG: 	'Discard uncommitted changes\\? \\[y,n\\]'
2022-10-29 19:46:43,259: %UNICON-DEBUG: 	'^(.*?)\\[.*\\][\\r\\n]+[AB]:.*@some-name#\\s?$'
2022-10-29 19:46:43,259: %UNICON-DEBUG: 
2022-10-29 19:46:43,260: %UNICON-DEBUG: *** Pattern Matched (target=some-name):: '^(.*?)\\[.*\\][\\r\\n]+[AB]:.*@some-name#\\s?$'
2022-10-29 19:46:43,260: %UNICON-DEBUG: <unicon.eal.MatchMode mode_id=0, mode_name='search multi-line re.S'>
2022-10-29 19:46:43,260: %UNICON-DEBUG: *** Match Groups:: ('\r\n\r\n',)
2022-10-29 19:46:43,260: %UNICON-DEBUG: Statement matched: '[pattern='^(.*?)\[.*\][\r\n]+[AB]:.*@some-name#\s?$', action=None, args=None, loop_continue=False, continue_timer=False, trim_buffer=True]'

Would you be so kind to look into it and advise what is going wrong?