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setup: copy in the latest version of ez_setup.py, which works even if setuptools is already imported, or can be imported, into the current Python interpreter, but can't be imported into a new Python interpreter in a subprocess

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This actually happens in practice -- this fixes the Desert Island scenario.  Thanks to PJE.
This commit is contained in:
Zooko O'Whielacronx 2007-12-21 23:26:20 -07:00
parent 922234ec29
commit f71b9312a5
1 changed files with 33 additions and 10 deletions
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43
ez_setup.py
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@ -68,10 +68,33 @@ def parse_version(s):
def setuptools_is_new_enough(required_version):
"""Return True if setuptools is already installed and has a version
number >= required_version."""
(cin, cout, cerr,) = os.popen3("%s -c \"import setuptools;print setuptools.__version__\"" % (sys.executable,))
verstr = cout.read().strip()
ver = parse_version(verstr)
return ver and ver >= parse_version(required_version)
if 'pkg_resources' in sys.modules:
import pkg_resources
try:
pkg_resources.require('setuptools >= %s' % (required_version,))
except pkg_resources.VersionConflict:
# An insufficiently new version is installed.
return False
else:
return True
else:
try:
import pkg_resources
except ImportError:
# Okay it is not installed.
return False
else:
try:
pkg_resources.require('setuptools >= %s' % (required_version,))
except pkg_resources.VersionConflict:
# An insufficiently new version is installed.
pkg_resources.__dict__.clear() # "If you want to be absolutely sure... before deleting it." --said PJE on IRC
del sys.modules['pkg_resources']
return False
else:
pkg_resources.__dict__.clear() # "If you want to be absolutely sure... before deleting it." --said PJE on IRC
del sys.modules['pkg_resources']
return True
def use_setuptools(
version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir,
@ -91,12 +114,12 @@ def use_setuptools(
if min_version is None:
min_version = version
if not setuptools_is_new_enough(min_version):
egg = download_setuptools(version, download_base, to_dir, download_delay)
egg = download_setuptools(version, min_version, download_base, to_dir, download_delay)
sys.path.insert(0, egg)
import setuptools; setuptools.bootstrap_install_from = egg
def download_setuptools(
version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir,
version=DEFAULT_VERSION, min_version=DEFAULT_VERSION, download_base=DEFAULT_URL, to_dir=os.curdir,
delay = 15
):
"""Download setuptools from a specified location and return its filename
@ -117,8 +140,8 @@ def download_setuptools(
if delay:
log.warn("""
---------------------------------------------------------------------------
This script requires setuptools version %s to run (even to display
help). I will attempt to download it for you (from
This script requires setuptools version >= %s to run (even to display
help). I will attempt to download setuptools for you (from
%s), but
you may need to enable firewall access for this script first.
I will start the download in %d seconds.
@ -129,7 +152,7 @@ I will start the download in %d seconds.
and place it in this directory before rerunning this script.)
---------------------------------------------------------------------------""",
version, download_base, delay, url
min_version, download_base, delay, url
); from time import sleep; sleep(delay)
log.warn("Downloading %s", url)
src = urllib2.urlopen(url)
@ -155,7 +178,7 @@ def main(argv, version=DEFAULT_VERSION):
else:
egg = None
try:
egg = download_setuptools(version, delay=0)
egg = download_setuptools(version, min_version=version, delay=0)
sys.path.insert(0,egg)
from setuptools.command.easy_install import main
return main(list(argv)+[egg]) # we're done here