aboutsummaryrefslogtreecommitdiffstats
path: root/QMP/qmp-shell
blob: 1fb7e767b0bb430e63b9b113d79409a945c85609 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
#!/usr/bin/python
#
# Low-level QEMU shell on top of QMP.
#
# Copyright (C) 2009, 2010 Red Hat Inc.
#
# Authors:
#  Luiz Capitulino <lcapitulino@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2.  See
# the COPYING file in the top-level directory.
#
# Usage:
#
# Start QEMU with:
#
# # qemu [...] -qmp unix:./qmp-sock,server
#
# Run the shell:
#
# $ qmp-shell ./qmp-sock
#
# Commands have the following format:
#
#    < command-name > [ arg-name1=arg1 ] ... [ arg-nameN=argN ]
#
# For example:
#
# (QEMU) device_add driver=e1000 id=net1
# {u'return': {}}
# (QEMU)

import qmp
import readline
import sys

class QMPCompleter(list):
    def complete(self, text, state):
        for cmd in self:
            if cmd.startswith(text):
                if not state:
                    return cmd
                else:
                    state -= 1

class QMPShellError(Exception):
    pass

class QMPShellBadPort(QMPShellError):
    pass

# TODO: QMPShell's interface is a bit ugly (eg. _fill_completion() and
#       _execute_cmd()). Let's design a better one.
class QMPShell(qmp.QEMUMonitorProtocol):
    def __init__(self, address):
        qmp.QEMUMonitorProtocol.__init__(self, self.__get_address(address))
        self._greeting = None
        self._completer = None

    def __get_address(self, arg):
        """
        Figure out if the argument is in the port:host form, if it's not it's
        probably a file path.
        """
        addr = arg.split(':')
        if len(addr) == 2:
            try:
                port = int(addr[1])
            except ValueError:
                raise QMPShellBadPort
            return ( addr[0], port )
        # socket path
        return arg

    def _fill_completion(self):
        for cmd in self.cmd('query-commands')['return']:
            self._completer.append(cmd['name'])

    def __completer_setup(self):
        self._completer = QMPCompleter()
        self._fill_completion()
        readline.set_completer(self._completer.complete)
        readline.parse_and_bind("tab: complete")
        # XXX: default delimiters conflict with some command names (eg. query-),
        # clearing everything as it doesn't seem to matter
        readline.set_completer_delims('')

    def __build_cmd(self, cmdline):
        """
        Build a QMP input object from a user provided command-line in the
        following format:
    
            < command-name > [ arg-name1=arg1 ] ... [ arg-nameN=argN ]
        """
        cmdargs = cmdline.split()
        qmpcmd = { 'execute': cmdargs[0], 'arguments': {} }
        for arg in cmdargs[1:]:
            opt = arg.split('=')
            try:
                value = int(opt[1])
            except ValueError:
                value = opt[1]
            qmpcmd['arguments'][opt[0]] = value
        return qmpcmd

    def _execute_cmd(self, cmdline):
        try:
            qmpcmd = self.__build_cmd(cmdline)
        except:
            print 'command format: <command-name> ',
            print '[arg-name1=arg1] ... [arg-nameN=argN]'
            return True
        resp = self.cmd_obj(qmpcmd)
        if resp is None:
            print 'Disconnected'
            return False
        print resp
        return True

    def connect(self):
        self._greeting = qmp.QEMUMonitorProtocol.connect(self)
        self.__completer_setup()

    def show_banner(self, msg='Welcome to the QMP low-level shell!'):
        print msg
        version = self._greeting['QMP']['version']['qemu']
        print 'Connected to QEMU %d.%d.%d\n' % (version['major'],version['minor'],version['micro'])

    def read_exec_command(self, prompt):
        """
        Read and execute a command.

        @return True if execution was ok, return False if disconnected.
        """
        try:
            cmdline = raw_input(prompt)
        except EOFError:
            print
            return False
        if cmdline == '':
            for ev in self.get_events():
                print ev
            self.clear_events()
            return True
        else:
            return self._execute_cmd(cmdline)

def die(msg):
    sys.stderr.write('ERROR: %s\n' % msg)
    sys.exit(1)

def fail_cmdline(option=None):
    if option:
        sys.stderr.write('ERROR: bad command-line option \'%s\'\n' % option)
    sys.stderr.write('qemu-shell [ -H ] < UNIX socket path> | < TCP address:port >\n')
    sys.exit(1)

def main():
    try:
        if len(sys.argv) == 2:
            qemu = QMPShell(sys.argv[1])
        else:
                fail_cmdline()
    except QMPShellBadPort:
        die('bad port number in command-line')

    try:
        qemu.connect()
    except qmp.QMPConnectError:
        die('Didn\'t get QMP greeting message')
    except qmp.QMPCapabilitiesError:
        die('Could not negotiate capabilities')
    except qemu.error:
        die('Could not connect to %s' % sys.argv[1])

    qemu.show_banner()
    while qemu.read_exec_command('(QEMU) '):
        pass
    qemu.close()

if __name__ == '__main__':
    main()