Mercurial > libervia-backend

annotate frontends/src/jp/cmd_shell.py @ 2313:6ff5212997c7

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jp (shell): use of subprocess instead of running commands in the same process: when a command is calling host.quit() in a D-Bus callback, GLib mainloop is exiting and quit the whole process without (apparently?) any way to block it. Couldn't find a good way to avoid that, so subprocess are now used as a workaround, instead of launching commands in the same process. When we'll get rid of python-dbus, there may be an other way. Execuring external commands is now possible through the shell/! command.
author Goffi <goffi@goffi.org>
date Fri, 07 Jul 2017 22:33:55 +0200
parents a42a2478abd2
children 8d9bd5d77336
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # jp: a SàT command line tool
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5 # Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20
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21 import base
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22 import cmd
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23 import sys
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24 from sat.core.i18n import _
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25 from sat.core import exceptions
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26 from sat_frontends.jp.constants import Const as C
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27 from sat.tools.common.ansi import ANSI as A
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28 import shlex
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29 import subprocess
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30
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31 __commands__ = ["Shell"]
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32 INTRO = _(u"""Welcome to {app_name} shell, the Salut à Toi shell !
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33
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34 This enrironment helps you using several {app_name} commands with similar parameters.
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35
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36 To quit, just enter "quit" or press C-c.
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37 Enter "help" or "?" to know what to do
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38 """).format(app_name = C.APP_NAME)
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39
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40
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41 class Shell(base.CommandBase, cmd.Cmd):
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42
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43 def __init__(self, host):
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44 base.CommandBase.__init__(self, host, 'shell', help=_(u'launch jp in shell (REPL) mode'))
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45 cmd.Cmd.__init__(self)
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46
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47 def parse_args(self, args):
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48 """parse line arguments"""
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49 return shlex.split(args, posix=True)
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50
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51 def get_cmd_choices(self, cmd=None, parser=None):
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52 if parser is None:
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53 parser = self._cur_parser
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54 try:
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55 choices = parser._subparsers._group_actions[0].choices
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56 return choices[cmd] if cmd is not None else choices
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57 except (KeyError, AttributeError):
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58 raise exceptions.NotFound
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59
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60 def update_path(self):
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61 self._cur_parser = self.host.parser
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62 self.help = u''
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63 for idx, path_elt in enumerate(self.path):
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64 try:
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65 self._cur_parser = self.get_cmd_choices(path_elt)
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66 except exceptions.NotFound:
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67 self.disp(_(u'bad command path'), error=True)
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68 self.path=self.path[:idx]
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69 break
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70 else:
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71 self.help = self._cur_parser
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72
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73 self.prompt = A.color(C.A_PROMPT_PATH, u'/'.join(self.path)) + A.color(C.A_PROMPT_SUF, u'> ')
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74 try:
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75 self.actions = self.get_cmd_choices().keys()
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76 except exceptions.NotFound:
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77 self.actions = []
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78
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79 def add_parser_options(self):
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80 pass
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81
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82 def escape_arg(self, arg):
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83 """format arg with quotes"""
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84 return u'"' + arg.replace(u'"',u'\\"') + u'"'
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85
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86 def format_args(self, args):
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87 """format argument to be printed with quotes if needed"""
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88 for arg in args:
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89 if " " in arg:
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90 yield self.escape_arg(arg)
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91 else:
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92 yield arg
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93
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94 def get_use_args(self, args):
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95 """format args for current parser according to self.use"""
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96 parser = self._cur_parser
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97
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98 # we check not optional args to see if there
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99 # is a corresonding parser
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100 # else USE args would not work correctly (only for current parser)
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101 cmd_args = []
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102 for arg in args:
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103 if arg.startswith('-'):
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104 break
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105 try:
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106 parser = self.get_cmd_choices(arg, parser)
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107 except exceptions.NotFound:
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108 break
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109 cmd_args.append(arg)
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110
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111 # we remove command args
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112 # they'll be in returned list (use_args)
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113 del args[:len(cmd_args)]
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114
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115 opt_args = []
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116 pos_args = []
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117 actions = {a.dest: a for a in parser._actions}
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118 for arg, value in self.use.iteritems():
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119 try:
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120 action = actions[arg]
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121 except KeyError:
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122 if self.verbose:
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123 self.disp(_(u'ignoring {name}={value}, not corresponding to any argument (in USE)').format(
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124 name=arg,
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125 value=self.escape_arg(value)))
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126 else:
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127 if self.verbose:
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128 self.disp(_(u'arg {name}={value} set (in USE)').format(name=arg, value=self.escape_arg(value)))
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129 if not action.option_strings:
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130 pos_args.append(value)
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131 else:
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132 opt_args.append(action.option_strings[0])
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133 opt_args.append(value)
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134 return cmd_args + opt_args + pos_args
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135
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136 def run_cmd(self, args, external=False):
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137 """run command and retur exit code
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138
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139 @param args[list[string]]: arguments of the command
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140 must not include program name
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141 @param external(bool): True if it's an external command (i.e. not jp)
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142 @return (int): exit code (0 success, any other int failure)
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143 """
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144 # FIXME: we have to use subprocess
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145 # and relaunch whole python for now
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146 # because if host.quit() is called in D-Bus callback
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147 # GLib quit the whole app without possibility to stop it
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148 # didn't found a nice way to work around it so far
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149 # Situation should be better when we'll move away from python-dbus
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150 if self.verbose:
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151 self.disp(_(u"COMMAND {external}=> {args}").format(
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152 external = _(u'(external) ') if external else u'',
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153 args=u' '.join(self.format_args(args))))
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154 if not external:
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155 args = sys.argv[0:1] + args
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156 ret_code= subprocess.call(args)
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157 # XXX: below is a way to launch the command without creating a new process
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158 # may be used when a solution to the aforementioned issue is there
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159 # try:
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160 # self.host.run(args)
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161 # except SystemExit as e:
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162 # ret_code = e.code
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163 # except Exception as e:
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164 # self.disp(A.color(C.A_FAILURE, u'command failed with an exception: {msg}'.format(msg=e)), error=True)
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165 # ret_code = 1
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166 # else:
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167 # ret_code = 0
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168
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169 if ret_code != 0:
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170 self.disp(A.color(C.A_FAILURE, u'command failed with an error code of {err_no}'.format(err_no=ret_code)), error=True)
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171 return ret_code
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172
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173 def default(self, args):
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174 """called when no shell command is recognized
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175
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176 will launch the command with args on the line
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177 (i.e. will launch do [args])
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178 """
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179 self.do_do(args)
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180
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181 def do_help(self, args):
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182 """show help message"""
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183 if not args:
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184 self.disp(A.color(C.A_HEADER, _(u'Shell commands:')), no_lf=True)
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185 super(Shell, self).do_help(args)
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186 if not args:
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187 self.disp(A.color(C.A_HEADER, _(u'Action commands:')))
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188 help_list = self._cur_parser.format_help().split('\n\n')
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189 print('\n\n'.join(help_list[1 if self.path else 2:]))
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190
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191 def do_debug(self, args):
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192 """launch internal debugger"""
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193 try:
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194 import ipdb as pdb
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195 except ImportError:
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196 import pdb
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197 pdb.set_trace()
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198
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199 def do_verbose(self, args):
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200 """show verbose mode, or (de)activate it"""
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201 args = self.parse_args(args)
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202 if args:
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203 self.verbose = C.bool(args[0])
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204 self.disp(_(u'verbose mode is {status}').format(
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205 status = _(u'ENABLED') if self.verbose else _(u'DISABLED')))
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206
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207 def do_cmd(self, args):
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208 """change command path"""
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209 if args == '..':
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210 self.path = self.path[:-1]
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211 else:
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212 if not args or args[0] == '/':
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213 self.path = []
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214 args = '/'.join(args.split())
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215 for path_elt in args.split('/'):
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216 path_elt = path_elt.strip()
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217 if not path_elt:
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218 continue
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219 self.path.append(path_elt)
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220 self.update_path()
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221
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222 def do_version(self, args):
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223 """show current SàT/jp version"""
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224 try:
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225 self.host.run(['--version'])
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226 except SystemExit:
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227 pass
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228
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229 def do_shell(self, args):
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230 """launch an external command (you can use ![command] too)"""
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231 args = self.parse_args(args)
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232 self.run_cmd(args, external=True)
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233
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234 def do_do(self, args):
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235 """lauch a command"""
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236 args = self.parse_args(args)
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237 # args may be modified by use_args
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238 # to remove subparsers from it
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239 use_args = self.get_use_args(args)
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240 cmd_args = self.path + use_args + args
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241 self.run_cmd(cmd_args)
2309
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242
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243 def do_use(self, args):
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244 """fix an argument"""
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245 args = self.parse_args(args)
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246 if not args:
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247 if not self.use:
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248 self.disp(_(u'no argument in USE'))
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249 else:
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250 self.disp(_(u'arguments in USE:'))
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251 for arg, value in self.use.iteritems():
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252 self.disp(_(A.color(C.A_SUBHEADER, arg, A.RESET, u' = ', self.escape_arg(value))))
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253 elif len(args) != 2:
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254 self.disp(u'bad syntax, please use:\nuse [arg] [value]', error=True)
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255 else:
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256 self.use[args[0]] = u' '.join(args[1:])
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257 if self.verbose:
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258 self.disp('set {name} = {value}'.format(
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259 name = args[0], value=self.escape_arg(args[1])))
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260
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261 def do_use_clear(self, args):
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262 """unset one or many argument(s) in USE, or all of them if no arg is specified"""
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263 args = self.parse_args(args)
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264 if not args:
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265 self.use.clear()
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266 else:
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267 for arg in args:
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268 try:
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269 del self.use[arg]
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270 except KeyError:
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271 self.disp(A.color(C.A_FAILURE, _(u'argument {name} not found').format(name=arg)), error=True)
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272 else:
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273 if self.verbose:
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274 self.disp(_(u'argument {name} removed').format(name=arg))
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275
2311
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276 def do_whoami(self, args):
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277 u"""print profile currently used"""
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278 self.disp(self.profile)
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279
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280 def do_quit(self, args):
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281 u"""quit the shell"""
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282 self.disp(_(u'good bye!'))
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283 self.host.quit()
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284
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285 def do_exit(self, args):
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286 u"""alias for quit"""
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287 self.do_quit(args)
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288
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289 def start(self):
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290 self.path = []
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291 self._cur_parser = self.host.parser
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292 self.use = {}
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293 self.verbose = False
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294 self.update_path()
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295 self.cmdloop(INTRO.encode('utf-8'))