Mercurial > cpython-lru_cache-weakref

annotate Lib/packaging/command/build_scripts.py @ 70199:cc5cfeaa4a8d

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Issue #10419, issue #6011: port 6ad356525381 fix from distutils to packaging build_scripts command of packaging now handles correctly non-ASCII path (path to the Python executable). Open and write the script in binary mode, but ensure that the shebang is decodable from UTF-8 and from the encoding of the script.
author Victor Stinner <victor.stinner@haypocalc.com>
date Thu, 19 May 2011 15:18:36 +0200
parents 1a31c3be88b1
children cc5e3a65e452
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """Build scripts (copy to build dir and fix up shebang line)."""
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2
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3 import os
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4 import re
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5 import sysconfig
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6 import tokenize
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7
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8 from packaging.command.cmd import Command
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9 from packaging.util import convert_path, newer
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10 from packaging import logger
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11 from packaging.compat import Mixin2to3
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12
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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, Mixin2to3):
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18
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19 description = "build scripts (copy and fix up shebang 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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28
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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 self.use_2to3 = False
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37 self.convert_2to3_doctests = None
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38 self.use_2to3_fixers = None
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39
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40 def finalize_options(self):
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41 self.set_undefined_options('build',
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42 ('build_scripts', 'build_dir'),
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43 'use_2to3', 'use_2to3_fixers',
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44 'convert_2to3_doctests', 'force',
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45 'executable')
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46 self.scripts = self.distribution.scripts
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47
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48 def get_source_files(self):
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49 return self.scripts
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50
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51 def run(self):
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52 if not self.scripts:
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53 return
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54 copied_files = self.copy_scripts()
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55 if self.use_2to3 and copied_files:
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56 self._run_2to3(copied_files, fixers=self.use_2to3_fixers)
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57
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58 def copy_scripts(self):
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59 """Copy each script listed in 'self.scripts'; if it's marked as a
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60 Python script in the Unix way (first line matches 'first_line_re',
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61 ie. starts with "\#!" and contains "python"), then adjust the first
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62 line to refer to the current Python interpreter as we copy.
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63 """
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64 self.mkpath(self.build_dir)
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65 outfiles = []
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66 for script in self.scripts:
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67 adjust = False
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68 script = convert_path(script)
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69 outfile = os.path.join(self.build_dir, os.path.basename(script))
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70 outfiles.append(outfile)
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71
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72 if not self.force and not newer(script, outfile):
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73 logger.debug("not copying %s (up-to-date)", script)
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74 continue
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75
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76 # Always open the file, but ignore failures in dry-run mode --
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77 # that way, we'll get accurate feedback if we can read the
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78 # script.
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79 try:
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80 f = open(script, "rb")
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81 except IOError:
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82 if not self.dry_run:
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83 raise
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84 f = None
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85 else:
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86 encoding, lines = tokenize.detect_encoding(f.readline)
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87 f.seek(0)
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88 first_line = f.readline()
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89 if not first_line:
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90 logger.warning('%s: %s is an empty file (skipping)',
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91 self.get_command_name(), script)
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92 continue
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93
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94 match = first_line_re.match(first_line)
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95 if match:
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96 adjust = True
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97 post_interp = match.group(1) or b''
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98
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99 if adjust:
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100 logger.info("copying and adjusting %s -> %s", script,
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101 self.build_dir)
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102 if not self.dry_run:
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103 if not sysconfig.is_python_build():
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104 executable = self.executable
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105 else:
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106 executable = os.path.join(
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107 sysconfig.get_config_var("BINDIR"),
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108 "python%s%s" % (sysconfig.get_config_var("VERSION"),
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109 sysconfig.get_config_var("EXE")))
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110 executable = os.fsencode(executable)
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111 shebang = b"#!" + executable + post_interp + b"\n"
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112 # Python parser starts to read a script using UTF-8 until
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113 # it gets a #coding:xxx cookie. The shebang has to be the
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114 # first line of a file, the #coding:xxx cookie cannot be
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115 # written before. So the shebang has to be decodable from
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116 # UTF-8.
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117 try:
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118 shebang.decode('utf-8')
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119 except UnicodeDecodeError:
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120 raise ValueError(
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121 "The shebang ({!r}) is not decodable "
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122 "from utf-8".format(shebang))
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123 # If the script is encoded to a custom encoding (use a
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124 # #coding:xxx cookie), the shebang has to be decodable from
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125 # the script encoding too.
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126 try:
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127 shebang.decode(encoding)
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128 except UnicodeDecodeError:
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129 raise ValueError(
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130 "The shebang ({!r}) is not decodable "
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131 "from the script encoding ({})"
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132 .format(shebang, encoding))
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133 with open(outfile, "wb") as outf:
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134 outf.write(shebang)
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135 outf.writelines(f.readlines())
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136 if f:
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137 f.close()
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138 else:
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139 if f:
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140 f.close()
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141 self.copy_file(script, outfile)
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142
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143 if os.name == 'posix':
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144 for file in outfiles:
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145 if self.dry_run:
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146 logger.info("changing mode of %s", file)
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147 else:
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148 oldmode = os.stat(file).st_mode & 0o7777
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149 newmode = (oldmode | 0o555) & 0o7777
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150 if newmode != oldmode:
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151 logger.info("changing mode of %s from %o to %o",
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152 file, oldmode, newmode)
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153 os.chmod(file, newmode)
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154 return outfiles