Mercurial > libervia-backend
annotate ez_setup.py @ 2227:79d279d1ee88
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| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Mon, 17 Apr 2017 20:33:32 +0200 |
| parents | 16ce9a6580a3 |
| children |
| rev | line source |
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1 #!/usr/bin/env python |
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2 """Bootstrap setuptools installation |
| 231 | 3 |
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4 To use setuptools in your package's setup.py, include this |
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5 file in the same directory and add this to the top of your setup.py:: |
| 231 | 6 |
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7 from ez_setup import use_setuptools |
| 231 | 8 use_setuptools() |
| 9 | |
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10 To require a specific version of setuptools, set a download |
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11 mirror, or use an alternate download directory, simply supply |
| 231 | 12 the appropriate options to ``use_setuptools()``. |
| 13 | |
| 14 This file can also be run as a script to install or upgrade setuptools. | |
| 15 """ | |
| 16 import os | |
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17 import shutil |
| 231 | 18 import sys |
| 19 import tempfile | |
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20 import zipfile |
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21 import optparse |
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22 import subprocess |
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23 import platform |
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24 import textwrap |
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25 import contextlib |
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26 |
| 231 | 27 from distutils import log |
| 28 | |
| 29 try: | |
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30 from urllib.request import urlopen |
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31 except ImportError: |
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32 from urllib2 import urlopen |
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33 |
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34 try: |
| 231 | 35 from site import USER_SITE |
| 36 except ImportError: | |
| 37 USER_SITE = None | |
| 38 | |
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39 DEFAULT_VERSION = "5.5" |
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40 DEFAULT_URL = "https://pypi.python.org/packages/source/s/setuptools/" |
| 231 | 41 |
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42 def _python_cmd(*args): |
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43 """ |
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44 Return True if the command succeeded. |
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45 """ |
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46 args = (sys.executable,) + args |
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47 return subprocess.call(args) == 0 |
| 231 | 48 |
| 49 | |
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50 def _install(archive_filename, install_args=()): |
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51 with archive_context(archive_filename): |
| 231 | 52 # installing |
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53 log.warn('Installing Setuptools') |
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54 if not _python_cmd('setup.py', 'install', *install_args): |
| 231 | 55 log.warn('Something went wrong during the installation.') |
| 56 log.warn('See the error message above.') | |
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57 # exitcode will be 2 |
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58 return 2 |
| 231 | 59 |
| 60 | |
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61 def _build_egg(egg, archive_filename, to_dir): |
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62 with archive_context(archive_filename): |
| 231 | 63 # building an egg |
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64 log.warn('Building a Setuptools egg in %s', to_dir) |
| 231 | 65 _python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir) |
| 66 # returning the result | |
| 67 log.warn(egg) | |
| 68 if not os.path.exists(egg): | |
| 69 raise IOError('Could not build the egg.') | |
| 70 | |
| 71 | |
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72 class ContextualZipFile(zipfile.ZipFile): |
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73 """ |
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74 Supplement ZipFile class to support context manager for Python 2.6 |
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75 """ |
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76 |
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77 def __enter__(self): |
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78 return self |
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79 |
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80 def __exit__(self, type, value, traceback): |
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81 self.close() |
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82 |
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83 def __new__(cls, *args, **kwargs): |
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84 """ |
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85 Construct a ZipFile or ContextualZipFile as appropriate |
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86 """ |
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87 if hasattr(zipfile.ZipFile, '__exit__'): |
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88 return zipfile.ZipFile(*args, **kwargs) |
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89 return super(ContextualZipFile, cls).__new__(cls) |
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90 |
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91 |
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92 @contextlib.contextmanager |
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93 def archive_context(filename): |
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94 # extracting the archive |
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95 tmpdir = tempfile.mkdtemp() |
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96 log.warn('Extracting in %s', tmpdir) |
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97 old_wd = os.getcwd() |
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98 try: |
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99 os.chdir(tmpdir) |
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100 with ContextualZipFile(filename) as archive: |
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101 archive.extractall() |
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102 |
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103 # going in the directory |
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104 subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0]) |
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105 os.chdir(subdir) |
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106 log.warn('Now working in %s', subdir) |
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107 yield |
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108 |
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109 finally: |
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110 os.chdir(old_wd) |
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111 shutil.rmtree(tmpdir) |
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112 |
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113 |
| 231 | 114 def _do_download(version, download_base, to_dir, download_delay): |
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115 egg = os.path.join(to_dir, 'setuptools-%s-py%d.%d.egg' |
| 231 | 116 % (version, sys.version_info[0], sys.version_info[1])) |
| 117 if not os.path.exists(egg): | |
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118 archive = download_setuptools(version, download_base, |
| 231 | 119 to_dir, download_delay) |
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120 _build_egg(egg, archive, to_dir) |
| 231 | 121 sys.path.insert(0, egg) |
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122 |
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123 # Remove previously-imported pkg_resources if present (see |
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124 # https://bitbucket.org/pypa/setuptools/pull-request/7/ for details). |
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125 if 'pkg_resources' in sys.modules: |
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126 del sys.modules['pkg_resources'] |
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127 |
| 231 | 128 import setuptools |
| 129 setuptools.bootstrap_install_from = egg | |
| 130 | |
| 131 | |
| 132 def use_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL, | |
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133 to_dir=os.curdir, download_delay=15): |
| 231 | 134 to_dir = os.path.abspath(to_dir) |
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135 rep_modules = 'pkg_resources', 'setuptools' |
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136 imported = set(sys.modules).intersection(rep_modules) |
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137 try: |
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138 import pkg_resources |
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139 except ImportError: |
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140 return _do_download(version, download_base, to_dir, download_delay) |
| 231 | 141 try: |
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142 pkg_resources.require("setuptools>=" + version) |
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143 return |
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144 except pkg_resources.DistributionNotFound: |
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145 return _do_download(version, download_base, to_dir, download_delay) |
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146 except pkg_resources.VersionConflict as VC_err: |
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147 if imported: |
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148 msg = textwrap.dedent(""" |
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149 The required version of setuptools (>={version}) is not available, |
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150 and can't be installed while this script is running. Please |
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151 install a more recent version first, using |
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152 'easy_install -U setuptools'. |
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153 |
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154 (Currently using {VC_err.args[0]!r}) |
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155 """).format(VC_err=VC_err, version=version) |
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156 sys.stderr.write(msg) |
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157 sys.exit(2) |
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158 |
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159 # otherwise, reload ok |
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160 del pkg_resources, sys.modules['pkg_resources'] |
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161 return _do_download(version, download_base, to_dir, download_delay) |
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162 |
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163 def _clean_check(cmd, target): |
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164 """ |
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165 Run the command to download target. If the command fails, clean up before |
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166 re-raising the error. |
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167 """ |
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168 try: |
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169 subprocess.check_call(cmd) |
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170 except subprocess.CalledProcessError: |
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171 if os.access(target, os.F_OK): |
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172 os.unlink(target) |
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173 raise |
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174 |
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175 def download_file_powershell(url, target): |
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176 """ |
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177 Download the file at url to target using Powershell (which will validate |
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178 trust). Raise an exception if the command cannot complete. |
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179 """ |
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180 target = os.path.abspath(target) |
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181 ps_cmd = ( |
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182 "[System.Net.WebRequest]::DefaultWebProxy.Credentials = " |
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183 "[System.Net.CredentialCache]::DefaultCredentials; " |
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184 "(new-object System.Net.WebClient).DownloadFile(%(url)r, %(target)r)" |
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185 % vars() |
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186 ) |
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187 cmd = [ |
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188 'powershell', |
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189 '-Command', |
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190 ps_cmd, |
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191 ] |
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192 _clean_check(cmd, target) |
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193 |
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194 def has_powershell(): |
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195 if platform.system() != 'Windows': |
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196 return False |
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197 cmd = ['powershell', '-Command', 'echo test'] |
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198 with open(os.path.devnull, 'wb') as devnull: |
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199 try: |
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200 subprocess.check_call(cmd, stdout=devnull, stderr=devnull) |
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201 except Exception: |
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202 return False |
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203 return True |
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204 |
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205 download_file_powershell.viable = has_powershell |
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206 |
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207 def download_file_curl(url, target): |
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208 cmd = ['curl', url, '--silent', '--output', target] |
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209 _clean_check(cmd, target) |
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210 |
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211 def has_curl(): |
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212 cmd = ['curl', '--version'] |
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213 with open(os.path.devnull, 'wb') as devnull: |
| 231 | 214 try: |
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215 subprocess.check_call(cmd, stdout=devnull, stderr=devnull) |
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216 except Exception: |
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217 return False |
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218 return True |
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219 |
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220 download_file_curl.viable = has_curl |
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221 |
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222 def download_file_wget(url, target): |
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223 cmd = ['wget', url, '--quiet', '--output-document', target] |
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224 _clean_check(cmd, target) |
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225 |
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226 def has_wget(): |
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227 cmd = ['wget', '--version'] |
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228 with open(os.path.devnull, 'wb') as devnull: |
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229 try: |
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230 subprocess.check_call(cmd, stdout=devnull, stderr=devnull) |
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231 except Exception: |
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232 return False |
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233 return True |
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234 |
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235 download_file_wget.viable = has_wget |
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236 |
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237 def download_file_insecure(url, target): |
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238 """ |
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239 Use Python to download the file, even though it cannot authenticate the |
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240 connection. |
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241 """ |
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242 src = urlopen(url) |
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243 try: |
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244 # Read all the data in one block. |
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245 data = src.read() |
| 231 | 246 finally: |
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247 src.close() |
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248 |
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249 # Write all the data in one block to avoid creating a partial file. |
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250 with open(target, "wb") as dst: |
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251 dst.write(data) |
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252 |
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253 download_file_insecure.viable = lambda: True |
| 231 | 254 |
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255 def get_best_downloader(): |
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256 downloaders = ( |
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257 download_file_powershell, |
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258 download_file_curl, |
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259 download_file_wget, |
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260 download_file_insecure, |
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261 ) |
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262 viable_downloaders = (dl for dl in downloaders if dl.viable()) |
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263 return next(viable_downloaders, None) |
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264 |
| 231 | 265 def download_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL, |
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266 to_dir=os.curdir, delay=15, downloader_factory=get_best_downloader): |
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267 """ |
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268 Download setuptools from a specified location and return its filename |
| 231 | 269 |
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270 `version` should be a valid setuptools version number that is available |
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271 as an sdist for download under the `download_base` URL (which should end |
| 231 | 272 with a '/'). `to_dir` is the directory where the egg will be downloaded. |
| 273 `delay` is the number of seconds to pause before an actual download | |
| 274 attempt. | |
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275 |
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276 ``downloader_factory`` should be a function taking no arguments and |
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277 returning a function for downloading a URL to a target. |
| 231 | 278 """ |
| 279 # making sure we use the absolute path | |
| 280 to_dir = os.path.abspath(to_dir) | |
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281 zip_name = "setuptools-%s.zip" % version |
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282 url = download_base + zip_name |
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283 saveto = os.path.join(to_dir, zip_name) |
| 231 | 284 if not os.path.exists(saveto): # Avoid repeated downloads |
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285 log.warn("Downloading %s", url) |
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286 downloader = downloader_factory() |
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287 downloader(url, saveto) |
| 231 | 288 return os.path.realpath(saveto) |
| 289 | |
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290 def _build_install_args(options): |
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291 """ |
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292 Build the arguments to 'python setup.py install' on the setuptools package |
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293 """ |
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294 return ['--user'] if options.user_install else [] |
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295 |
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296 def _parse_args(): |
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297 """ |
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298 Parse the command line for options |
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299 """ |
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300 parser = optparse.OptionParser() |
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301 parser.add_option( |
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302 '--user', dest='user_install', action='store_true', default=False, |
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303 help='install in user site package (requires Python 2.6 or later)') |
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304 parser.add_option( |
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305 '--download-base', dest='download_base', metavar="URL", |
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306 default=DEFAULT_URL, |
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307 help='alternative URL from where to download the setuptools package') |
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308 parser.add_option( |
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309 '--insecure', dest='downloader_factory', action='store_const', |
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310 const=lambda: download_file_insecure, default=get_best_downloader, |
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311 help='Use internal, non-validating downloader' |
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312 ) |
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313 parser.add_option( |
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314 '--version', help="Specify which version to download", |
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315 default=DEFAULT_VERSION, |
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316 ) |
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317 options, args = parser.parse_args() |
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318 # positional arguments are ignored |
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319 return options |
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320 |
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321 def main(): |
| 231 | 322 """Install or upgrade setuptools and EasyInstall""" |
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323 options = _parse_args() |
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324 archive = download_setuptools( |
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325 version=options.version, |
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326 download_base=options.download_base, |
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327 downloader_factory=options.downloader_factory, |
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328 ) |
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329 return _install(archive, _build_install_args(options)) |
| 231 | 330 |
| 331 if __name__ == '__main__': | |
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332 sys.exit(main()) |