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annotate Lib/distutils/command/build_scripts.py @ 74135:9c19df6c8ea0 3.2

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News entry for Issue12798
author Senthil Kumaran <senthil@uthcode.com>
date Fri, 23 Dec 2011 11:11:21 +0800
parents 3e26c9033306
children 6b9f0a6efaeb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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dad205d13bb5 Bastian Kleineidam: the "build_scripts" command.
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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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18
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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 IOError:
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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 outf = open(outfile, "wb")
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130 outf.write(shebang)
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131 outf.writelines(f.readlines())
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132 outf.close()
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133 if f:
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134 f.close()
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135 else:
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136 if f:
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137 f.close()
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138 updated_files.append(outfile)
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139 self.copy_file(script, outfile)
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140
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141 if os.name == 'posix':
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142 for file in outfiles:
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143 if self.dry_run:
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144 log.info("changing mode of %s", file)
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145 else:
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146 oldmode = os.stat(file)[ST_MODE] & 0o7777
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147 newmode = (oldmode | 0o555) & 0o7777
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148 if newmode != oldmode:
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149 log.info("changing mode of %s from %o to %o",
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150 file, oldmode, newmode)
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151 os.chmod(file, newmode)
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152 # XXX should we modify self.outfiles?
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153 return outfiles, updated_files
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154
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155 class build_scripts_2to3(build_scripts, Mixin2to3):
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156
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157 def copy_scripts(self):
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158 outfiles, updated_files = build_scripts.copy_scripts(self)
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159 if not self.dry_run:
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160 self.run_2to3(updated_files)
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161 return outfiles, updated_files