Update version of ez_setup.py.

ez_setup.py

@@ -17,20 +17,26 @@
 import shutil
 import sys
 import tempfile
-import tarfile
+import zipfile
 import optparse
 import subprocess
 import platform
 import textwrap
+import contextlib
 
 from distutils import log
 
+try:
+    from urllib.request import urlopen
+except ImportError:
+    from urllib2 import urlopen
+
 try:
     from site import USER_SITE
 except ImportError:
     USER_SITE = None
 
-DEFAULT_VERSION = "2.2"
+DEFAULT_VERSION = "5.7"
 DEFAULT_URL = "https://pypi.python.org/packages/source/s/setuptools/"
 
 def _python_cmd(*args):
@@ -40,70 +46,78 @@ def _python_cmd(*args):
     args = (sys.executable,) + args
     return subprocess.call(args) == 0
 
-def _install(tarball, install_args=()):
-    # extracting the tarball
-    tmpdir = tempfile.mkdtemp()
-    log.warn('Extracting in %s', tmpdir)
-    old_wd = os.getcwd()
-    try:
-        os.chdir(tmpdir)
-        tar = tarfile.open(tarball)
-        _extractall(tar)
-        tar.close()
-
-        # going in the directory
-        subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0])
-        os.chdir(subdir)
-        log.warn('Now working in %s', subdir)
 
+def _install(archive_filename, install_args=()):
+    with archive_context(archive_filename):
         # installing
         log.warn('Installing Setuptools')
         if not _python_cmd('setup.py', 'install', *install_args):
             log.warn('Something went wrong during the installation.')
             log.warn('See the error message above.')
             # exitcode will be 2
             return 2
-    finally:
-        os.chdir(old_wd)
-        shutil.rmtree(tmpdir)
 
 
-def _build_egg(egg, tarball, to_dir):
-    # extracting the tarball
+def _build_egg(egg, archive_filename, to_dir):
+    with archive_context(archive_filename):
+        # building an egg
+        log.warn('Building a Setuptools egg in %s', to_dir)
+        _python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir)
+    # returning the result
+    log.warn(egg)
+    if not os.path.exists(egg):
+        raise IOError('Could not build the egg.')
+
+
+class ContextualZipFile(zipfile.ZipFile):
+    """
+    Supplement ZipFile class to support context manager for Python 2.6
+    """
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type, value, traceback):
+        self.close()
+
+    def __new__(cls, *args, **kwargs):
+        """
+        Construct a ZipFile or ContextualZipFile as appropriate
+        """
+        if hasattr(zipfile.ZipFile, '__exit__'):
+            return zipfile.ZipFile(*args, **kwargs)
+        return super(ContextualZipFile, cls).__new__(cls)
+
+
+@contextlib.contextmanager
+def archive_context(filename):
+    # extracting the archive
     tmpdir = tempfile.mkdtemp()
     log.warn('Extracting in %s', tmpdir)
     old_wd = os.getcwd()
     try:
         os.chdir(tmpdir)
-        tar = tarfile.open(tarball)
-        _extractall(tar)
-        tar.close()
+        with ContextualZipFile(filename) as archive:
+            archive.extractall()
 
         # going in the directory
         subdir = os.path.join(tmpdir, os.listdir(tmpdir)[0])
         os.chdir(subdir)
         log.warn('Now working in %s', subdir)
-
-        # building an egg
-        log.warn('Building a Setuptools egg in %s', to_dir)
-        _python_cmd('setup.py', '-q', 'bdist_egg', '--dist-dir', to_dir)
+        yield
 
     finally:
         os.chdir(old_wd)
         shutil.rmtree(tmpdir)
-    # returning the result
-    log.warn(egg)
-    if not os.path.exists(egg):
-        raise IOError('Could not build the egg.')
 
 
 def _do_download(version, download_base, to_dir, download_delay):
     egg = os.path.join(to_dir, 'setuptools-%s-py%d.%d.egg'
                        % (version, sys.version_info[0], sys.version_info[1]))
     if not os.path.exists(egg):
-        tarball = download_setuptools(version, download_base,
+        archive = download_setuptools(version, download_base,
                                       to_dir, download_delay)
-        _build_egg(egg, tarball, to_dir)
+        _build_egg(egg, archive, to_dir)
     sys.path.insert(0, egg)
 
     # Remove previously-imported pkg_resources if present (see
@@ -116,7 +130,7 @@ def _do_download(version, download_base, to_dir, download_delay):
 
 
 def use_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL,
-                   to_dir=os.curdir, download_delay=15):
+        to_dir=os.curdir, download_delay=15):
     to_dir = os.path.abspath(to_dir)
     rep_modules = 'pkg_resources', 'setuptools'
     imported = set(sys.modules).intersection(rep_modules)
@@ -164,25 +178,28 @@ def download_file_powershell(url, target):
     trust). Raise an exception if the command cannot complete.
     """
     target = os.path.abspath(target)
+    ps_cmd = (
+        "[System.Net.WebRequest]::DefaultWebProxy.Credentials = "
+        "[System.Net.CredentialCache]::DefaultCredentials; "
+        "(new-object System.Net.WebClient).DownloadFile(%(url)r, %(target)r)"
+        % vars()
+    )
     cmd = [
         'powershell',
         '-Command',
-        "(new-object System.Net.WebClient).DownloadFile(%(url)r, %(target)r)" % vars(),
+        ps_cmd,
     ]
     _clean_check(cmd, target)
 
 def has_powershell():
     if platform.system() != 'Windows':
         return False
     cmd = ['powershell', '-Command', 'echo test']
-    devnull = open(os.path.devnull, 'wb')
-    try:
+    with open(os.path.devnull, 'wb') as devnull:
         try:
             subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
-        except:
+        except Exception:
             return False
-    finally:
-        devnull.close()
     return True
 
 download_file_powershell.viable = has_powershell
@@ -193,14 +210,11 @@ def download_file_curl(url, target):
 
 def has_curl():
     cmd = ['curl', '--version']
-    devnull = open(os.path.devnull, 'wb')
-    try:
+    with open(os.path.devnull, 'wb') as devnull:
         try:
             subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
-        except:
+        except Exception:
             return False
-    finally:
-        devnull.close()
     return True
 
 download_file_curl.viable = has_curl
@@ -211,14 +225,11 @@ def download_file_wget(url, target):
 
 def has_wget():
     cmd = ['wget', '--version']
-    devnull = open(os.path.devnull, 'wb')
-    try:
+    with open(os.path.devnull, 'wb') as devnull:
         try:
             subprocess.check_call(cmd, stdout=devnull, stderr=devnull)
-        except:
+        except Exception:
             return False
-    finally:
-        devnull.close()
     return True
 
 download_file_wget.viable = has_wget
@@ -228,45 +239,36 @@ def download_file_insecure(url, target):
     Use Python to download the file, even though it cannot authenticate the
     connection.
     """
+    src = urlopen(url)
     try:
-        from urllib.request import urlopen
-    except ImportError:
-        from urllib2 import urlopen
-    src = dst = None
-    try:
-        src = urlopen(url)
-        # Read/write all in one block, so we don't create a corrupt file
-        # if the download is interrupted.
+        # Read all the data in one block.
         data = src.read()
-        dst = open(target, "wb")
-        dst.write(data)
     finally:
-        if src:
-            src.close()
-        if dst:
-            dst.close()
+        src.close()
+
+    # Write all the data in one block to avoid creating a partial file.
+    with open(target, "wb") as dst:
+        dst.write(data)
 
 download_file_insecure.viable = lambda: True
 
 def get_best_downloader():
-    downloaders = [
+    downloaders = (
         download_file_powershell,
         download_file_curl,
         download_file_wget,
         download_file_insecure,
-    ]
-
-    for dl in downloaders:
-        if dl.viable():
-            return dl
+    )
+    viable_downloaders = (dl for dl in downloaders if dl.viable())
+    return next(viable_downloaders, None)
 
 def download_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL,
-                        to_dir=os.curdir, delay=15,
-                        downloader_factory=get_best_downloader):
-    """Download setuptools from a specified location and return its filename
+        to_dir=os.curdir, delay=15, downloader_factory=get_best_downloader):
+    """
+    Download setuptools from a specified location and return its filename
 
     `version` should be a valid setuptools version number that is available
-    as an egg for download under the `download_base` URL (which should end
+    as an sdist for download under the `download_base` URL (which should end
     with a '/'). `to_dir` is the directory where the egg will be downloaded.
     `delay` is the number of seconds to pause before an actual download
     attempt.
@@ -276,56 +278,15 @@ def download_setuptools(version=DEFAULT_VERSION, download_base=DEFAULT_URL,
     """
     # making sure we use the absolute path
     to_dir = os.path.abspath(to_dir)
-    tgz_name = "setuptools-%s.tar.gz" % version
-    url = download_base + tgz_name
-    saveto = os.path.join(to_dir, tgz_name)
+    zip_name = "setuptools-%s.zip" % version
+    url = download_base + zip_name
+    saveto = os.path.join(to_dir, zip_name)
     if not os.path.exists(saveto):  # Avoid repeated downloads
         log.warn("Downloading %s", url)
         downloader = downloader_factory()
         downloader(url, saveto)
     return os.path.realpath(saveto)
 
-
-def _extractall(self, path=".", members=None):
-    """Extract all members from the archive to the current working
-       directory and set owner, modification time and permissions on
-       directories afterwards. `path' specifies a different directory
-       to extract to. `members' is optional and must be a subset of the
-       list returned by getmembers().
-    """
-    import copy
-    import operator
-    from tarfile import ExtractError
-    directories = []
-
-    if members is None:
-        members = self
-
-    for tarinfo in members:
-        if tarinfo.isdir():
-            # Extract directories with a safe mode.
-            directories.append(tarinfo)
-            tarinfo = copy.copy(tarinfo)
-            tarinfo.mode = 448  # decimal for oct 0700
-        self.extract(tarinfo, path)
-
-    # Reverse sort directories.
-    directories.sort(key=operator.attrgetter('name'), reverse=True)
-
-    # Set correct owner, mtime and filemode on directories.
-    for tarinfo in directories:
-        dirpath = os.path.join(path, tarinfo.name)
-        try:
-            self.chown(tarinfo, dirpath)
-            self.utime(tarinfo, dirpath)
-            self.chmod(tarinfo, dirpath)
-        except ExtractError as e:
-            if self.errorlevel > 1:
-                raise
-            else:
-                self._dbg(1, "tarfile: %s" % e)
-
-
 def _build_install_args(options):
     """
     Build the arguments to 'python setup.py install' on the setuptools package
@@ -349,16 +310,23 @@ def _parse_args():
         const=lambda: download_file_insecure, default=get_best_downloader,
         help='Use internal, non-validating downloader'
     )
+    parser.add_option(
+        '--version', help="Specify which version to download",
+        default=DEFAULT_VERSION,
+    )
     options, args = parser.parse_args()
     # positional arguments are ignored
     return options
 
-def main(version=DEFAULT_VERSION):
+def main():
     """Install or upgrade setuptools and EasyInstall"""
     options = _parse_args()
-    tarball = download_setuptools(download_base=options.download_base,
-        downloader_factory=options.downloader_factory)
-    return _install(tarball, _build_install_args(options))
+    archive = download_setuptools(
+        version=options.version,
+        download_base=options.download_base,
+        downloader_factory=options.downloader_factory,
+    )
+    return _install(archive, _build_install_args(options))
 
 if __name__ == '__main__':
     sys.exit(main())