fcfab75410
Use shlex to split the CLI command, respecting quoted arguments, and
also comments. This allows to call for ex:
(QEMU) human-monitor-command command-line="screendump /dev/null"
{"execute": "human-monitor-command", "arguments": {"command-line": "screendump /dev/null"}}
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20180326150916.9602-3-marcandre.lureau@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
459 lines
14 KiB
Python
Executable File
459 lines
14 KiB
Python
Executable File
#!/usr/bin/python
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#
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# Low-level QEMU shell on top of QMP.
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#
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# Copyright (C) 2009, 2010 Red Hat Inc.
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#
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# Authors:
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# Luiz Capitulino <lcapitulino@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2. See
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# the COPYING file in the top-level directory.
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#
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# Usage:
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#
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# Start QEMU with:
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#
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# # qemu [...] -qmp unix:./qmp-sock,server
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#
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# Run the shell:
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#
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# $ qmp-shell ./qmp-sock
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#
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# Commands have the following format:
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#
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# < command-name > [ arg-name1=arg1 ] ... [ arg-nameN=argN ]
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#
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# For example:
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#
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# (QEMU) device_add driver=e1000 id=net1
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# {u'return': {}}
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# (QEMU)
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#
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# key=value pairs also support Python or JSON object literal subset notations,
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# without spaces. Dictionaries/objects {} are supported as are arrays [].
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#
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# example-command arg-name1={'key':'value','obj'={'prop':"value"}}
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#
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# Both JSON and Python formatting should work, including both styles of
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# string literal quotes. Both paradigms of literal values should work,
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# including null/true/false for JSON and None/True/False for Python.
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#
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#
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# Transactions have the following multi-line format:
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#
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# transaction(
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# action-name1 [ arg-name1=arg1 ] ... [arg-nameN=argN ]
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# ...
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# action-nameN [ arg-name1=arg1 ] ... [arg-nameN=argN ]
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# )
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#
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# One line transactions are also supported:
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#
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# transaction( action-name1 ... )
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#
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# For example:
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#
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# (QEMU) transaction(
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# TRANS> block-dirty-bitmap-add node=drive0 name=bitmap1
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# TRANS> block-dirty-bitmap-clear node=drive0 name=bitmap0
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# TRANS> )
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# {"return": {}}
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# (QEMU)
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#
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# Use the -v and -p options to activate the verbose and pretty-print options,
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# which will echo back the properly formatted JSON-compliant QMP that is being
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# sent to QEMU, which is useful for debugging and documentation generation.
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from __future__ import print_function
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import qmp
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import json
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import ast
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import readline
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import sys
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import os
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import errno
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import atexit
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import shlex
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class QMPCompleter(list):
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def complete(self, text, state):
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for cmd in self:
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if cmd.startswith(text):
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if not state:
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return cmd
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else:
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state -= 1
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class QMPShellError(Exception):
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pass
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class QMPShellBadPort(QMPShellError):
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pass
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class FuzzyJSON(ast.NodeTransformer):
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'''This extension of ast.NodeTransformer filters literal "true/false/null"
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values in an AST and replaces them by proper "True/False/None" values that
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Python can properly evaluate.'''
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def visit_Name(self, node):
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if node.id == 'true':
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node.id = 'True'
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if node.id == 'false':
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node.id = 'False'
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if node.id == 'null':
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node.id = 'None'
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return node
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# TODO: QMPShell's interface is a bit ugly (eg. _fill_completion() and
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# _execute_cmd()). Let's design a better one.
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class QMPShell(qmp.QEMUMonitorProtocol):
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def __init__(self, address, pretty=False):
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super(QMPShell, self).__init__(self.__get_address(address))
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self._greeting = None
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self._completer = None
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self._pretty = pretty
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self._transmode = False
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self._actions = list()
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self._histfile = os.path.join(os.path.expanduser('~'),
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'.qmp-shell_history')
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def __get_address(self, arg):
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"""
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Figure out if the argument is in the port:host form, if it's not it's
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probably a file path.
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"""
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addr = arg.split(':')
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if len(addr) == 2:
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try:
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port = int(addr[1])
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except ValueError:
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raise QMPShellBadPort
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return ( addr[0], port )
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# socket path
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return arg
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def _fill_completion(self):
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cmds = self.cmd('query-commands')
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if 'error' in cmds:
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return
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for cmd in cmds['return']:
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self._completer.append(cmd['name'])
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def __completer_setup(self):
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self._completer = QMPCompleter()
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self._fill_completion()
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readline.set_history_length(1024)
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readline.set_completer(self._completer.complete)
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readline.parse_and_bind("tab: complete")
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# XXX: default delimiters conflict with some command names (eg. query-),
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# clearing everything as it doesn't seem to matter
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readline.set_completer_delims('')
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try:
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readline.read_history_file(self._histfile)
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except Exception as e:
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if isinstance(e, IOError) and e.errno == errno.ENOENT:
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# File not found. No problem.
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pass
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else:
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print("Failed to read history '%s'; %s" % (self._histfile, e))
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atexit.register(self.__save_history)
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def __save_history(self):
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try:
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readline.write_history_file(self._histfile)
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except Exception as e:
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print("Failed to save history file '%s'; %s" % (self._histfile, e))
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def __parse_value(self, val):
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try:
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return int(val)
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except ValueError:
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pass
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if val.lower() == 'true':
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return True
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if val.lower() == 'false':
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return False
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if val.startswith(('{', '[')):
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# Try first as pure JSON:
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try:
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return json.loads(val)
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except ValueError:
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pass
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# Try once again as FuzzyJSON:
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try:
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st = ast.parse(val, mode='eval')
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return ast.literal_eval(FuzzyJSON().visit(st))
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except SyntaxError:
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pass
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except ValueError:
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pass
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return val
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def __cli_expr(self, tokens, parent):
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for arg in tokens:
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(key, sep, val) = arg.partition('=')
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if sep != '=':
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raise QMPShellError("Expected a key=value pair, got '%s'" % arg)
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value = self.__parse_value(val)
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optpath = key.split('.')
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curpath = []
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for p in optpath[:-1]:
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curpath.append(p)
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d = parent.get(p, {})
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if type(d) is not dict:
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raise QMPShellError('Cannot use "%s" as both leaf and non-leaf key' % '.'.join(curpath))
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parent[p] = d
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parent = d
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if optpath[-1] in parent:
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if type(parent[optpath[-1]]) is dict:
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raise QMPShellError('Cannot use "%s" as both leaf and non-leaf key' % '.'.join(curpath))
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else:
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raise QMPShellError('Cannot set "%s" multiple times' % key)
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parent[optpath[-1]] = value
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def __build_cmd(self, cmdline):
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"""
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Build a QMP input object from a user provided command-line in the
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following format:
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< command-name > [ arg-name1=arg1 ] ... [ arg-nameN=argN ]
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"""
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cmdargs = shlex.split(cmdline)
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# Transactional CLI entry/exit:
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if cmdargs[0] == 'transaction(':
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self._transmode = True
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cmdargs.pop(0)
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elif cmdargs[0] == ')' and self._transmode:
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self._transmode = False
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if len(cmdargs) > 1:
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raise QMPShellError("Unexpected input after close of Transaction sub-shell")
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qmpcmd = { 'execute': 'transaction',
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'arguments': { 'actions': self._actions } }
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self._actions = list()
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return qmpcmd
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# Nothing to process?
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if not cmdargs:
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return None
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# Parse and then cache this Transactional Action
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if self._transmode:
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finalize = False
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action = { 'type': cmdargs[0], 'data': {} }
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if cmdargs[-1] == ')':
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cmdargs.pop(-1)
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finalize = True
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self.__cli_expr(cmdargs[1:], action['data'])
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self._actions.append(action)
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return self.__build_cmd(')') if finalize else None
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# Standard command: parse and return it to be executed.
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qmpcmd = { 'execute': cmdargs[0], 'arguments': {} }
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self.__cli_expr(cmdargs[1:], qmpcmd['arguments'])
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return qmpcmd
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def _print(self, qmp):
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indent = None
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if self._pretty:
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indent = 4
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jsobj = json.dumps(qmp, indent=indent)
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print(str(jsobj))
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def _execute_cmd(self, cmdline):
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try:
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qmpcmd = self.__build_cmd(cmdline)
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except Exception as e:
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print('Error while parsing command line: %s' % e)
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print('command format: <command-name> ', end=' ')
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print('[arg-name1=arg1] ... [arg-nameN=argN]')
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return True
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# For transaction mode, we may have just cached the action:
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if qmpcmd is None:
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return True
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if self._verbose:
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self._print(qmpcmd)
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resp = self.cmd_obj(qmpcmd)
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if resp is None:
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print('Disconnected')
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return False
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self._print(resp)
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return True
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def connect(self, negotiate):
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self._greeting = super(QMPShell, self).connect(negotiate)
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self.__completer_setup()
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def show_banner(self, msg='Welcome to the QMP low-level shell!'):
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print(msg)
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if not self._greeting:
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print('Connected')
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return
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version = self._greeting['QMP']['version']['qemu']
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print('Connected to QEMU %d.%d.%d\n' % (version['major'],version['minor'],version['micro']))
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def get_prompt(self):
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if self._transmode:
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return "TRANS> "
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return "(QEMU) "
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def read_exec_command(self, prompt):
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"""
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Read and execute a command.
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@return True if execution was ok, return False if disconnected.
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"""
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try:
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cmdline = raw_input(prompt)
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except EOFError:
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print()
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return False
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if cmdline == '':
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for ev in self.get_events():
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print(ev)
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self.clear_events()
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return True
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else:
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return self._execute_cmd(cmdline)
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def set_verbosity(self, verbose):
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self._verbose = verbose
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class HMPShell(QMPShell):
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def __init__(self, address):
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QMPShell.__init__(self, address)
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self.__cpu_index = 0
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def __cmd_completion(self):
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for cmd in self.__cmd_passthrough('help')['return'].split('\r\n'):
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if cmd and cmd[0] != '[' and cmd[0] != '\t':
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name = cmd.split()[0] # drop help text
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if name == 'info':
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continue
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if name.find('|') != -1:
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# Command in the form 'foobar|f' or 'f|foobar', take the
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# full name
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opt = name.split('|')
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if len(opt[0]) == 1:
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name = opt[1]
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else:
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name = opt[0]
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self._completer.append(name)
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self._completer.append('help ' + name) # help completion
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def __info_completion(self):
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for cmd in self.__cmd_passthrough('info')['return'].split('\r\n'):
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if cmd:
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self._completer.append('info ' + cmd.split()[1])
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def __other_completion(self):
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# special cases
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self._completer.append('help info')
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def _fill_completion(self):
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self.__cmd_completion()
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self.__info_completion()
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self.__other_completion()
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def __cmd_passthrough(self, cmdline, cpu_index = 0):
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return self.cmd_obj({ 'execute': 'human-monitor-command', 'arguments':
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{ 'command-line': cmdline,
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'cpu-index': cpu_index } })
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def _execute_cmd(self, cmdline):
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if cmdline.split()[0] == "cpu":
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# trap the cpu command, it requires special setting
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try:
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idx = int(cmdline.split()[1])
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if not 'return' in self.__cmd_passthrough('info version', idx):
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print('bad CPU index')
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return True
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self.__cpu_index = idx
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except ValueError:
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print('cpu command takes an integer argument')
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return True
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resp = self.__cmd_passthrough(cmdline, self.__cpu_index)
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if resp is None:
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print('Disconnected')
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return False
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assert 'return' in resp or 'error' in resp
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if 'return' in resp:
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# Success
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if len(resp['return']) > 0:
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print(resp['return'], end=' ')
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else:
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# Error
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print('%s: %s' % (resp['error']['class'], resp['error']['desc']))
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return True
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def show_banner(self):
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QMPShell.show_banner(self, msg='Welcome to the HMP shell!')
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def die(msg):
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sys.stderr.write('ERROR: %s\n' % msg)
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sys.exit(1)
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def fail_cmdline(option=None):
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if option:
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sys.stderr.write('ERROR: bad command-line option \'%s\'\n' % option)
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sys.stderr.write('qmp-shell [ -v ] [ -p ] [ -H ] [ -N ] < UNIX socket path> | < TCP address:port >\n')
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sys.stderr.write(' -v Verbose (echo command sent and received)\n')
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sys.stderr.write(' -p Pretty-print JSON\n')
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sys.stderr.write(' -H Use HMP interface\n')
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sys.stderr.write(' -N Skip negotiate (for qemu-ga)\n')
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sys.exit(1)
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def main():
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addr = ''
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qemu = None
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hmp = False
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pretty = False
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verbose = False
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negotiate = True
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try:
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for arg in sys.argv[1:]:
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if arg == "-H":
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if qemu is not None:
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fail_cmdline(arg)
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hmp = True
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elif arg == "-p":
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pretty = True
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elif arg == "-N":
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negotiate = False
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elif arg == "-v":
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verbose = True
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else:
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if qemu is not None:
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fail_cmdline(arg)
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if hmp:
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qemu = HMPShell(arg)
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else:
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qemu = QMPShell(arg, pretty)
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addr = arg
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if qemu is None:
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fail_cmdline()
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except QMPShellBadPort:
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die('bad port number in command-line')
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try:
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qemu.connect(negotiate)
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except qmp.QMPConnectError:
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die('Didn\'t get QMP greeting message')
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except qmp.QMPCapabilitiesError:
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die('Could not negotiate capabilities')
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except qemu.error:
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die('Could not connect to %s' % addr)
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qemu.show_banner()
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qemu.set_verbosity(verbose)
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while qemu.read_exec_command(qemu.get_prompt()):
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pass
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qemu.close()
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if __name__ == '__main__':
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main()
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