Mercurial > cpython-lru_cache-weakref

annotate Lib/distutils/command/build_scripts.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 7d69d04522e3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """distutils.command.build_scripts
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2
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3 Implements the Distutils 'build_scripts' command."""
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4
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5 import os, re
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6 from stat import ST_MODE
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7 from distutils import sysconfig
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8 from distutils.core import Command
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9 from distutils.dep_util import newer
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10 from distutils.util import convert_path, Mixin2to3
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11 from distutils import log
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12 import tokenize
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13
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14 # check if Python is called on the first line with this expression
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15 first_line_re = re.compile(b'^#!.*python[0-9.]*([ \t].*)?$')
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16
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17 class build_scripts(Command):
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19 description = "\"build\" scripts (copy and fixup #! line)"
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20
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21 user_options = [
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22 ('build-dir=', 'd', "directory to \"build\" (copy) to"),
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23 ('force', 'f', "forcibly build everything (ignore file timestamps"),
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24 ('executable=', 'e', "specify final destination interpreter path"),
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25 ]
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26
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27 boolean_options = ['force']
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29
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30 def initialize_options(self):
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31 self.build_dir = None
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32 self.scripts = None
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33 self.force = None
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34 self.executable = None
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35 self.outfiles = None
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36
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37 def finalize_options(self):
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38 self.set_undefined_options('build',
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39 ('build_scripts', 'build_dir'),
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40 ('force', 'force'),
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41 ('executable', 'executable'))
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42 self.scripts = self.distribution.scripts
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43
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44 def get_source_files(self):
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45 return self.scripts
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46
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47 def run(self):
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48 if not self.scripts:
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49 return
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50 self.copy_scripts()
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51
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52
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53 def copy_scripts(self):
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54 """Copy each script listed in 'self.scripts'; if it's marked as a
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55 Python script in the Unix way (first line matches 'first_line_re',
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56 ie. starts with "\#!" and contains "python"), then adjust the first
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57 line to refer to the current Python interpreter as we copy.
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58 """
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59 self.mkpath(self.build_dir)
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60 outfiles = []
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61 updated_files = []
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62 for script in self.scripts:
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63 adjust = False
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64 script = convert_path(script)
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65 outfile = os.path.join(self.build_dir, os.path.basename(script))
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66 outfiles.append(outfile)
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67
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68 if not self.force and not newer(script, outfile):
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69 log.debug("not copying %s (up-to-date)", script)
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70 continue
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71
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72 # Always open the file, but ignore failures in dry-run mode --
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73 # that way, we'll get accurate feedback if we can read the
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74 # script.
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75 try:
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76 f = open(script, "rb")
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77 except OSError:
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78 if not self.dry_run:
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79 raise
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80 f = None
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81 else:
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82 encoding, lines = tokenize.detect_encoding(f.readline)
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83 f.seek(0)
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84 first_line = f.readline()
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85 if not first_line:
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86 self.warn("%s is an empty file (skipping)" % script)
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87 continue
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88
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89 match = first_line_re.match(first_line)
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90 if match:
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91 adjust = True
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92 post_interp = match.group(1) or b''
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93
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94 if adjust:
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95 log.info("copying and adjusting %s -> %s", script,
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96 self.build_dir)
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97 updated_files.append(outfile)
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98 if not self.dry_run:
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99 if not sysconfig.python_build:
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100 executable = self.executable
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101 else:
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102 executable = os.path.join(
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103 sysconfig.get_config_var("BINDIR"),
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104 "python%s%s" % (sysconfig.get_config_var("VERSION"),
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105 sysconfig.get_config_var("EXE")))
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106 executable = os.fsencode(executable)
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107 shebang = b"#!" + executable + post_interp + b"\n"
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108 # Python parser starts to read a script using UTF-8 until
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109 # it gets a #coding:xxx cookie. The shebang has to be the
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110 # first line of a file, the #coding:xxx cookie cannot be
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111 # written before. So the shebang has to be decodable from
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112 # UTF-8.
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113 try:
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114 shebang.decode('utf-8')
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115 except UnicodeDecodeError:
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116 raise ValueError(
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117 "The shebang ({!r}) is not decodable "
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118 "from utf-8".format(shebang))
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119 # If the script is encoded to a custom encoding (use a
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120 # #coding:xxx cookie), the shebang has to be decodable from
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121 # the script encoding too.
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122 try:
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123 shebang.decode(encoding)
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124 except UnicodeDecodeError:
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125 raise ValueError(
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126 "The shebang ({!r}) is not decodable "
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127 "from the script encoding ({})"
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128 .format(shebang, encoding))
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129 with open(outfile, "wb") as outf:
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130 outf.write(shebang)
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131 outf.writelines(f.readlines())
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132 if f:
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133 f.close()
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134 else:
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135 if f:
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136 f.close()
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137 updated_files.append(outfile)
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138 self.copy_file(script, outfile)
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139
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140 if os.name == 'posix':
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141 for file in outfiles:
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142 if self.dry_run:
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143 log.info("changing mode of %s", file)
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144 else:
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145 oldmode = os.stat(file)[ST_MODE] & 0o7777
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146 newmode = (oldmode | 0o555) & 0o7777
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147 if newmode != oldmode:
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148 log.info("changing mode of %s from %o to %o",
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149 file, oldmode, newmode)
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150 os.chmod(file, newmode)
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151 # XXX should we modify self.outfiles?
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152 return outfiles, updated_files
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153
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154 class build_scripts_2to3(build_scripts, Mixin2to3):
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155
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156 def copy_scripts(self):
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157 outfiles, updated_files = build_scripts.copy_scripts(self)
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158 if not self.dry_run:
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159 self.run_2to3(updated_files)
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160 return outfiles, updated_files