Mercurial > cpython-lru_cache-weakref

annotate Lib/packaging/command/cmd.py @ 70817:dd775b1561ba

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Fix markup.
author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 1a31c3be88b1
children b788eaff72bc
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1 """Base class for commands."""
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2
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3 import os
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4 import re
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5 from shutil import copyfile, move, make_archive
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6 from packaging import util
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7 from packaging import logger
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8 from packaging.errors import PackagingOptionError
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9
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10
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11 class Command:
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12 """Abstract base class for defining command classes, the "worker bees"
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13 of the Packaging. A useful analogy for command classes is to think of
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14 them as subroutines with local variables called "options". The options
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15 are "declared" in 'initialize_options()' and "defined" (given their
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16 final values, aka "finalized") in 'finalize_options()', both of which
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17 must be defined by every command class. The distinction between the
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18 two is necessary because option values might come from the outside
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19 world (command line, config file, ...), and any options dependent on
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20 other options must be computed *after* these outside influences have
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21 been processed -- hence 'finalize_options()'. The "body" of the
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22 subroutine, where it does all its work based on the values of its
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23 options, is the 'run()' method, which must also be implemented by every
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24 command class.
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25 """
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26
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27 # 'sub_commands' formalizes the notion of a "family" of commands,
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28 # eg. "install_dist" as the parent with sub-commands "install_lib",
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29 # "install_headers", etc. The parent of a family of commands
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30 # defines 'sub_commands' as a class attribute; it's a list of
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31 # (command_name : string, predicate : unbound_method | string | None)
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32 # tuples, where 'predicate' is a method of the parent command that
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33 # determines whether the corresponding command is applicable in the
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34 # current situation. (Eg. we "install_headers" is only applicable if
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35 # we have any C header files to install.) If 'predicate' is None,
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36 # that command is always applicable.
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37 #
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38 # 'sub_commands' is usually defined at the *end* of a class, because
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39 # predicates can be unbound methods, so they must already have been
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40 # defined. The canonical example is the "install_dist" command.
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41 sub_commands = []
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42
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43 # Pre and post command hooks are run just before or just after the command
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44 # itself. They are simple functions that receive the command instance. They
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45 # are specified as callable objects or dotted strings (for lazy loading).
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46 pre_hook = None
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47 post_hook = None
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48
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49 # -- Creation/initialization methods -------------------------------
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50
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51 def __init__(self, dist):
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52 """Create and initialize a new Command object. Most importantly,
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53 invokes the 'initialize_options()' method, which is the real
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54 initializer and depends on the actual command being instantiated.
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55 """
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56 # late import because of mutual dependence between these classes
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57 from packaging.dist import Distribution
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58
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59 if not isinstance(dist, Distribution):
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60 raise TypeError("dist must be a Distribution instance")
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61 if self.__class__ is Command:
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62 raise RuntimeError("Command is an abstract class")
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63
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64 self.distribution = dist
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65 self.initialize_options()
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66
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67 # Per-command versions of the global flags, so that the user can
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68 # customize Packaging' behaviour command-by-command and let some
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69 # commands fall back on the Distribution's behaviour. None means
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70 # "not defined, check self.distribution's copy", while 0 or 1 mean
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71 # false and true (duh). Note that this means figuring out the real
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72 # value of each flag is a touch complicated -- hence "self._dry_run"
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73 # will be handled by a property, below.
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74 # XXX This needs to be fixed. [I changed it to a property--does that
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75 # "fix" it?]
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76 self._dry_run = None
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77
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78 # Some commands define a 'self.force' option to ignore file
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79 # timestamps, but methods defined *here* assume that
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80 # 'self.force' exists for all commands. So define it here
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81 # just to be safe.
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82 self.force = None
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83
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84 # The 'help' flag is just used for command line parsing, so
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85 # none of that complicated bureaucracy is needed.
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86 self.help = False
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87
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88 # 'finalized' records whether or not 'finalize_options()' has been
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89 # called. 'finalize_options()' itself should not pay attention to
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90 # this flag: it is the business of 'ensure_finalized()', which
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91 # always calls 'finalize_options()', to respect/update it.
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92 self.finalized = False
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93
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94 # XXX A more explicit way to customize dry_run would be better.
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95 @property
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96 def dry_run(self):
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97 if self._dry_run is None:
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98 return getattr(self.distribution, 'dry_run')
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99 else:
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100 return self._dry_run
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101
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102 def ensure_finalized(self):
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103 if not self.finalized:
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104 self.finalize_options()
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105 self.finalized = True
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106
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107 # Subclasses must define:
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108 # initialize_options()
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109 # provide default values for all options; may be customized by
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110 # setup script, by options from config file(s), or by command-line
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111 # options
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112 # finalize_options()
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113 # decide on the final values for all options; this is called
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114 # after all possible intervention from the outside world
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115 # (command line, option file, etc.) has been processed
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116 # run()
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117 # run the command: do whatever it is we're here to do,
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118 # controlled by the command's various option values
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119
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120 def initialize_options(self):
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121 """Set default values for all the options that this command
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122 supports. Note that these defaults may be overridden by other
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123 commands, by the setup script, by config files, or by the
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124 command line. Thus, this is not the place to code dependencies
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125 between options; generally, 'initialize_options()' implementations
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126 are just a bunch of "self.foo = None" assignments.
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127
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128 This method must be implemented by all command classes.
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129 """
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130 raise RuntimeError(
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131 "abstract method -- subclass %s must override" % self.__class__)
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132
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133 def finalize_options(self):
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134 """Set final values for all the options that this command supports.
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135 This is always called as late as possible, ie. after any option
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136 assignments from the command line or from other commands have been
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137 done. Thus, this is the place to code option dependencies: if
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138 'foo' depends on 'bar', then it is safe to set 'foo' from 'bar' as
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139 long as 'foo' still has the same value it was assigned in
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140 'initialize_options()'.
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141
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142 This method must be implemented by all command classes.
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143 """
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144 raise RuntimeError(
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145 "abstract method -- subclass %s must override" % self.__class__)
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146
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147 def dump_options(self, header=None, indent=""):
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148 if header is None:
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149 header = "command options for '%s':" % self.get_command_name()
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150 logger.info(indent + header)
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151 indent = indent + " "
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152 negative_opt = getattr(self, 'negative_opt', ())
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153 for option, _, _ in self.user_options:
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154 if option in negative_opt:
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155 continue
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156 option = option.replace('-', '_')
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157 if option[-1] == "=":
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158 option = option[:-1]
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159 value = getattr(self, option)
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160 logger.info(indent + "%s = %s", option, value)
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161
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162 def run(self):
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163 """A command's raison d'etre: carry out the action it exists to
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164 perform, controlled by the options initialized in
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165 'initialize_options()', customized by other commands, the setup
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166 script, the command line and config files, and finalized in
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167 'finalize_options()'. All terminal output and filesystem
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168 interaction should be done by 'run()'.
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169
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170 This method must be implemented by all command classes.
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171 """
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172 raise RuntimeError(
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173 "abstract method -- subclass %s must override" % self.__class__)
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174
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175 # -- External interface --------------------------------------------
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176 # (called by outsiders)
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177
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178 def get_source_files(self):
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179 """Return the list of files that are used as inputs to this command,
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180 i.e. the files used to generate the output files. The result is used
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181 by the `sdist` command in determining the set of default files.
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182
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183 Command classes should implement this method if they operate on files
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184 from the source tree.
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185 """
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186 return []
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187
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188 def get_outputs(self):
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189 """Return the list of files that would be produced if this command
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190 were actually run. Not affected by the "dry-run" flag or whether
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191 any other commands have been run.
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192
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193 Command classes should implement this method if they produce any
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194 output files that get consumed by another command. e.g., `build_ext`
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195 returns the list of built extension modules, but not any temporary
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196 files used in the compilation process.
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197 """
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198 return []
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199
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200 # -- Option validation methods -------------------------------------
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201 # (these are very handy in writing the 'finalize_options()' method)
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202 #
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203 # NB. the general philosophy here is to ensure that a particular option
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204 # value meets certain type and value constraints. If not, we try to
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205 # force it into conformance (eg. if we expect a list but have a string,
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206 # split the string on comma and/or whitespace). If we can't force the
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207 # option into conformance, raise PackagingOptionError. Thus, command
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208 # classes need do nothing more than (eg.)
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209 # self.ensure_string_list('foo')
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210 # and they can be guaranteed that thereafter, self.foo will be
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211 # a list of strings.
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212
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213 def _ensure_stringlike(self, option, what, default=None):
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214 val = getattr(self, option)
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215 if val is None:
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216 setattr(self, option, default)
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217 return default
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218 elif not isinstance(val, str):
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219 raise PackagingOptionError("'%s' must be a %s (got `%s`)" %
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220 (option, what, val))
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221 return val
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222
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223 def ensure_string(self, option, default=None):
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224 """Ensure that 'option' is a string; if not defined, set it to
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225 'default'.
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226 """
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227 self._ensure_stringlike(option, "string", default)
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228
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229 def ensure_string_list(self, option):
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230 r"""Ensure that 'option' is a list of strings. If 'option' is
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231 currently a string, we split it either on /,\s*/ or /\s+/, so
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232 "foo bar baz", "foo,bar,baz", and "foo, bar baz" all become
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233 ["foo", "bar", "baz"].
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234 """
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235 val = getattr(self, option)
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236 if val is None:
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237 return
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238 elif isinstance(val, str):
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239 setattr(self, option, re.split(r',\s*|\s+', val))
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240 else:
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241 if isinstance(val, list):
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242 # checks if all elements are str
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243 ok = True
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244 for element in val:
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245 if not isinstance(element, str):
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246 ok = False
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247 break
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248 else:
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249 ok = False
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250
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251 if not ok:
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252 raise PackagingOptionError(
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253 "'%s' must be a list of strings (got %r)" % (option, val))
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254
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255 def _ensure_tested_string(self, option, tester,
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256 what, error_fmt, default=None):
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257 val = self._ensure_stringlike(option, what, default)
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258 if val is not None and not tester(val):
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259 raise PackagingOptionError(
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260 ("error in '%s' option: " + error_fmt) % (option, val))
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261
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262 def ensure_filename(self, option):
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263 """Ensure that 'option' is the name of an existing file."""
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264 self._ensure_tested_string(option, os.path.isfile,
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265 "filename",
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266 "'%s' does not exist or is not a file")
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267
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268 def ensure_dirname(self, option):
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269 self._ensure_tested_string(option, os.path.isdir,
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270 "directory name",
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271 "'%s' does not exist or is not a directory")
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272
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273 # -- Convenience methods for commands ------------------------------
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274
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275 @classmethod
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276 def get_command_name(cls):
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277 if hasattr(cls, 'command_name'):
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278 return cls.command_name
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279 else:
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280 return cls.__name__
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281
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282 def set_undefined_options(self, src_cmd, *options):
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283 """Set values of undefined options from another command.
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284
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285 Undefined options are options set to None, which is the convention
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286 used to indicate that an option has not been changed between
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287 'initialize_options()' and 'finalize_options()'. This method is
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288 usually called from 'finalize_options()' for options that depend on
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289 some other command rather than another option of the same command,
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290 typically subcommands.
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291
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292 The 'src_cmd' argument is the other command from which option values
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293 will be taken (a command object will be created for it if necessary);
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294 the remaining positional arguments are strings that give the name of
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295 the option to set. If the name is different on the source and target
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296 command, you can pass a tuple with '(name_on_source, name_on_dest)' so
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297 that 'self.name_on_dest' will be set from 'src_cmd.name_on_source'.
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298 """
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299 src_cmd_obj = self.distribution.get_command_obj(src_cmd)
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300 src_cmd_obj.ensure_finalized()
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301 for obj in options:
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302 if isinstance(obj, tuple):
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303 src_option, dst_option = obj
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304 else:
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305 src_option, dst_option = obj, obj
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306 if getattr(self, dst_option) is None:
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307 setattr(self, dst_option,
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308 getattr(src_cmd_obj, src_option))
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309
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310 def get_finalized_command(self, command, create=True):
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311 """Wrapper around Distribution's 'get_command_obj()' method: find
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312 (create if necessary and 'create' is true) the command object for
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313 'command', call its 'ensure_finalized()' method, and return the
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314 finalized command object.
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315 """
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316 cmd_obj = self.distribution.get_command_obj(command, create)
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317 cmd_obj.ensure_finalized()
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318 return cmd_obj
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319
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320 def get_reinitialized_command(self, command, reinit_subcommands=False):
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321 return self.distribution.get_reinitialized_command(
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322 command, reinit_subcommands)
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323
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324 def run_command(self, command):
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325 """Run some other command: uses the 'run_command()' method of
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326 Distribution, which creates and finalizes the command object if
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327 necessary and then invokes its 'run()' method.
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328 """
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329 self.distribution.run_command(command)
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330
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331 def get_sub_commands(self):
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332 """Determine the sub-commands that are relevant in the current
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333 distribution (ie., that need to be run). This is based on the
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334 'sub_commands' class attribute: each tuple in that list may include
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335 a method that we call to determine if the subcommand needs to be
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336 run for the current distribution. Return a list of command names.
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337 """
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338 commands = []
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339 for sub_command in self.sub_commands:
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340 if len(sub_command) == 2:
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341 cmd_name, method = sub_command
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342 if method is None or method(self):
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343 commands.append(cmd_name)
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344 else:
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345 commands.append(sub_command)
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346 return commands
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347
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348 # -- External world manipulation -----------------------------------
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349
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350 def execute(self, func, args, msg=None, level=1):
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351 util.execute(func, args, msg, dry_run=self.dry_run)
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352
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353 def mkpath(self, name, mode=0o777, dry_run=None, verbose=0):
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354 if dry_run is None:
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355 dry_run = self.dry_run
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356 name = os.path.normpath(name)
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357 if os.path.isdir(name) or name == '':
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358 return
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359 if dry_run:
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360 head = ''
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361 for part in name.split(os.sep):
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362 logger.info("created directory %s%s", head, part)
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363 head += part + os.sep
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364 return
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365 os.makedirs(name, mode)
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366
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367 def copy_file(self, infile, outfile,
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368 preserve_mode=True, preserve_times=True, link=None, level=1):
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369 """Copy a file respecting verbose, dry-run and force flags. (The
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370 former two default to whatever is in the Distribution object, and
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371 the latter defaults to false for commands that don't define it.)"""
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372 if self.dry_run:
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diff changeset
373 # XXX add a comment
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374 return
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375 if os.path.isdir(outfile):
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376 outfile = os.path.join(outfile, os.path.split(infile)[-1])
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377 copyfile(infile, outfile)
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378 return outfile, None # XXX
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379
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380 def copy_tree(self, infile, outfile, preserve_mode=True,
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381 preserve_times=True, preserve_symlinks=False, level=1):
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382 """Copy an entire directory tree respecting verbose, dry-run,
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Tarek Ziade <tarek@ziade.org>
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diff changeset
383 and force flags.
1a31c3be88b1 initial import of the packaging package in the standard library
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384 """
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
385 if self.dry_run:
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386 return # see if we want to display something
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diff changeset
387
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
388
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389 return util.copy_tree(infile, outfile, preserve_mode, preserve_times,
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390 preserve_symlinks, not self.force, dry_run=self.dry_run)
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391
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392 def move_file(self, src, dst, level=1):
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diff changeset
393 """Move a file respecting the dry-run flag."""
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diff changeset
394 if self.dry_run:
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diff changeset
395 return # XXX log ?
1a31c3be88b1 initial import of the packaging package in the standard library
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396 return move(src, dst)
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
397
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
398 def spawn(self, cmd, search_path=True, level=1):
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
399 """Spawn an external command respecting dry-run flag."""
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
400 from packaging.util import spawn
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
401 spawn(cmd, search_path, dry_run=self.dry_run)
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diff changeset
402
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
403 def make_archive(self, base_name, format, root_dir=None, base_dir=None,
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
404 owner=None, group=None):
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
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diff changeset
405 return make_archive(base_name, format, root_dir,
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
406 base_dir, dry_run=self.dry_run,
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
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diff changeset
407 owner=owner, group=group)
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
diff changeset
408
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
409 def make_file(self, infiles, outfile, func, args,
1a31c3be88b1 initial import of the packaging package in the standard library
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parents:
diff changeset
410 exec_msg=None, skip_msg=None, level=1):
1a31c3be88b1 initial import of the packaging package in the standard library
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parents:
diff changeset
411 """Special case of 'execute()' for operations that process one or
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
diff changeset
412 more input files and generate one output file. Works just like
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
413 'execute()', except the operation is skipped and a different
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diff changeset
414 message printed if 'outfile' already exists and is newer than all
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
415 files listed in 'infiles'. If the command defined 'self.force',
1a31c3be88b1 initial import of the packaging package in the standard library
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parents:
diff changeset
416 and it is true, then the command is unconditionally run -- does no
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
diff changeset
417 timestamp checks.
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
418 """
1a31c3be88b1 initial import of the packaging package in the standard library
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diff changeset
419 if skip_msg is None:
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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420 skip_msg = "skipping %s (inputs unchanged)" % outfile
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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421
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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422 # Allow 'infiles' to be a single string
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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423 if isinstance(infiles, str):
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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424 infiles = (infiles,)
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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425 elif not isinstance(infiles, (list, tuple)):
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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426 raise TypeError(
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
diff changeset
427 "'infiles' must be a string, or a list or tuple of strings")
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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428
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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429 if exec_msg is None:
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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430 exec_msg = "generating %s from %s" % (outfile, ', '.join(infiles))
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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431
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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432 # If 'outfile' must be regenerated (either because it doesn't
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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433 # exist, is out-of-date, or the 'force' flag is true) then
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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434 # perform the action that presumably regenerates it
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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435 if self.force or util.newer_group(infiles, outfile):
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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436 self.execute(func, args, exec_msg, level)
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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437
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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438 # Otherwise, print the "skip" message
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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439 else:
1a31c3be88b1 initial import of the packaging package in the standard library
Tarek Ziade <tarek@ziade.org>
parents:
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440 logger.debug(skip_msg)