mirror of https://github.com/python/cpython
675 lines
23 KiB
Python
Executable File
675 lines
23 KiB
Python
Executable File
"""PyPI and direct package downloading"""
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import sys, os.path, re, urlparse, urllib2, shutil, random, socket
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from pkg_resources import *
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from distutils import log
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from distutils.errors import DistutilsError
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from md5 import md5
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from fnmatch import translate
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EGG_FRAGMENT = re.compile(r'^egg=([-A-Za-z0-9_.]+)$')
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HREF = re.compile("""href\\s*=\\s*['"]?([^'"> ]+)""", re.I)
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# this is here to fix emacs' cruddy broken syntax highlighting
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PYPI_MD5 = re.compile(
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'<a href="([^"#]+)">([^<]+)</a>\n\s+\\(<a href="[^?]+\?:action=show_md5'
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'&digest=([0-9a-f]{32})">md5</a>\\)'
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)
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URL_SCHEME = re.compile('([-+.a-z0-9]{2,}):',re.I).match
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EXTENSIONS = ".tar.gz .tar.bz2 .tar .zip .tgz".split()
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__all__ = [
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'PackageIndex', 'distros_for_url', 'parse_bdist_wininst',
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'interpret_distro_name',
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]
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def parse_bdist_wininst(name):
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"""Return (base,pyversion) or (None,None) for possible .exe name"""
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lower = name.lower()
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base, py_ver = None, None
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if lower.endswith('.exe'):
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if lower.endswith('.win32.exe'):
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base = name[:-10]
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elif lower.startswith('.win32-py',-16):
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py_ver = name[-7:-4]
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base = name[:-16]
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return base,py_ver
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def egg_info_for_url(url):
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scheme, server, path, parameters, query, fragment = urlparse.urlparse(url)
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base = urllib2.unquote(path.split('/')[-1])
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if '#' in base: base, fragment = base.split('#',1)
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return base,fragment
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def distros_for_url(url, metadata=None):
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"""Yield egg or source distribution objects that might be found at a URL"""
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base, fragment = egg_info_for_url(url)
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dists = distros_for_location(url, base, metadata)
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if fragment and not dists:
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match = EGG_FRAGMENT.match(fragment)
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if match:
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return interpret_distro_name(
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url, match.group(1), metadata, precedence = CHECKOUT_DIST
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)
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return dists
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def distros_for_location(location, basename, metadata=None):
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"""Yield egg or source distribution objects based on basename"""
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if basename.endswith('.egg.zip'):
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basename = basename[:-4] # strip the .zip
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if basename.endswith('.egg'): # only one, unambiguous interpretation
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return [Distribution.from_location(location, basename, metadata)]
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if basename.endswith('.exe'):
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win_base, py_ver = parse_bdist_wininst(basename)
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if win_base is not None:
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return interpret_distro_name(
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location, win_base, metadata, py_ver, BINARY_DIST, "win32"
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)
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# Try source distro extensions (.zip, .tgz, etc.)
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#
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for ext in EXTENSIONS:
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if basename.endswith(ext):
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basename = basename[:-len(ext)]
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return interpret_distro_name(location, basename, metadata)
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return [] # no extension matched
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def distros_for_filename(filename, metadata=None):
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"""Yield possible egg or source distribution objects based on a filename"""
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return distros_for_location(
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normalize_path(filename), os.path.basename(filename), metadata
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)
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def interpret_distro_name(location, basename, metadata,
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py_version=None, precedence=SOURCE_DIST, platform=None
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):
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"""Generate alternative interpretations of a source distro name
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Note: if `location` is a filesystem filename, you should call
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``pkg_resources.normalize_path()`` on it before passing it to this
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routine!
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"""
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# Generate alternative interpretations of a source distro name
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# Because some packages are ambiguous as to name/versions split
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# e.g. "adns-python-1.1.0", "egenix-mx-commercial", etc.
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# So, we generate each possible interepretation (e.g. "adns, python-1.1.0"
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# "adns-python, 1.1.0", and "adns-python-1.1.0, no version"). In practice,
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# the spurious interpretations should be ignored, because in the event
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# there's also an "adns" package, the spurious "python-1.1.0" version will
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# compare lower than any numeric version number, and is therefore unlikely
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# to match a request for it. It's still a potential problem, though, and
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# in the long run PyPI and the distutils should go for "safe" names and
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# versions in distribution archive names (sdist and bdist).
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parts = basename.split('-')
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for p in range(1,len(parts)+1):
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yield Distribution(
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location, metadata, '-'.join(parts[:p]), '-'.join(parts[p:]),
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py_version=py_version, precedence = precedence,
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platform = platform
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)
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class PackageIndex(Environment):
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"""A distribution index that scans web pages for download URLs"""
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def __init__(self,index_url="http://www.python.org/pypi",hosts=('*',),*args,**kw):
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Environment.__init__(self,*args,**kw)
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self.index_url = index_url + "/"[:not index_url.endswith('/')]
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self.scanned_urls = {}
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self.fetched_urls = {}
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self.package_pages = {}
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self.allows = re.compile('|'.join(map(translate,hosts))).match
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self.to_scan = []
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def process_url(self, url, retrieve=False):
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"""Evaluate a URL as a possible download, and maybe retrieve it"""
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url = fix_sf_url(url)
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if url in self.scanned_urls and not retrieve:
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return
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self.scanned_urls[url] = True
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if not URL_SCHEME(url):
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self.process_filename(url)
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return
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else:
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dists = list(distros_for_url(url))
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if dists:
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if not self.url_ok(url):
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return
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self.debug("Found link: %s", url)
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if dists or not retrieve or url in self.fetched_urls:
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map(self.add, dists)
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return # don't need the actual page
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if not self.url_ok(url):
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self.fetched_urls[url] = True
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return
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self.info("Reading %s", url)
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f = self.open_url(url)
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self.fetched_urls[url] = self.fetched_urls[f.url] = True
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if 'html' not in f.headers['content-type'].lower():
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f.close() # not html, we can't process it
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return
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base = f.url # handle redirects
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page = f.read()
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f.close()
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if url.startswith(self.index_url):
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page = self.process_index(url, page)
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for match in HREF.finditer(page):
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link = urlparse.urljoin(base, match.group(1))
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self.process_url(link)
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def process_filename(self, fn, nested=False):
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# process filenames or directories
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if not os.path.exists(fn):
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self.warn("Not found: %s", url)
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return
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if os.path.isdir(fn) and not nested:
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path = os.path.realpath(fn)
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for item in os.listdir(path):
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self.process_filename(os.path.join(path,item), True)
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dists = distros_for_filename(fn)
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if dists:
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self.debug("Found: %s", fn)
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map(self.add, dists)
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def url_ok(self, url, fatal=False):
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if self.allows(urlparse.urlparse(url)[1]):
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return True
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msg = "\nLink to % s ***BLOCKED*** by --allow-hosts\n"
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if fatal:
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raise DistutilsError(msg % url)
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else:
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self.warn(msg, url)
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def process_index(self,url,page):
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"""Process the contents of a PyPI page"""
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def scan(link):
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# Process a URL to see if it's for a package page
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if link.startswith(self.index_url):
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parts = map(
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urllib2.unquote, link[len(self.index_url):].split('/')
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)
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if len(parts)==2:
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# it's a package page, sanitize and index it
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pkg = safe_name(parts[0])
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ver = safe_version(parts[1])
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self.package_pages.setdefault(pkg.lower(),{})[link] = True
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return to_filename(pkg), to_filename(ver)
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return None, None
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if url==self.index_url or 'Index of Packages</title>' in page:
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# process an index page into the package-page index
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for match in HREF.finditer(page):
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scan( urlparse.urljoin(url, match.group(1)) )
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else:
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pkg,ver = scan(url) # ensure this page is in the page index
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# process individual package page
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for tag in ("<th>Home Page", "<th>Download URL"):
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pos = page.find(tag)
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if pos!=-1:
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match = HREF.search(page,pos)
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if match:
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# Process the found URL
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new_url = urlparse.urljoin(url, match.group(1))
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base, frag = egg_info_for_url(new_url)
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if base.endswith('.py') and not frag:
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if pkg and ver:
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new_url+='#egg=%s-%s' % (pkg,ver)
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else:
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self.need_version_info(url)
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self.scan_url(new_url)
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return PYPI_MD5.sub(
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lambda m: '<a href="%s#md5=%s">%s</a>' % m.group(1,3,2), page
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)
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def need_version_info(self, url):
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self.scan_all(
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"Page at %s links to .py file(s) without version info; an index "
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"scan is required.", url
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)
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def scan_all(self, msg=None, *args):
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if self.index_url not in self.fetched_urls:
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if msg: self.warn(msg,*args)
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self.warn(
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"Scanning index of all packages (this may take a while)"
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)
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self.scan_url(self.index_url)
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def find_packages(self, requirement):
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self.scan_url(self.index_url + requirement.unsafe_name+'/')
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if not self.package_pages.get(requirement.key):
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# Fall back to safe version of the name
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self.scan_url(self.index_url + requirement.project_name+'/')
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if not self.package_pages.get(requirement.key):
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# We couldn't find the target package, so search the index page too
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self.warn(
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"Couldn't find index page for %r (maybe misspelled?)",
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requirement.unsafe_name
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)
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self.scan_all()
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for url in self.package_pages.get(requirement.key,()):
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# scan each page that might be related to the desired package
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self.scan_url(url)
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def obtain(self, requirement, installer=None):
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self.prescan(); self.find_packages(requirement)
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for dist in self[requirement.key]:
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if dist in requirement:
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return dist
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self.debug("%s does not match %s", requirement, dist)
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return super(PackageIndex, self).obtain(requirement,installer)
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def check_md5(self, cs, info, filename, tfp):
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if re.match('md5=[0-9a-f]{32}$', info):
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self.debug("Validating md5 checksum for %s", filename)
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if cs.hexdigest()<>info[4:]:
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tfp.close()
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os.unlink(filename)
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raise DistutilsError(
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"MD5 validation failed for "+os.path.basename(filename)+
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"; possible download problem?"
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)
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def add_find_links(self, urls):
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"""Add `urls` to the list that will be prescanned for searches"""
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for url in urls:
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if (
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self.to_scan is None # if we have already "gone online"
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or not URL_SCHEME(url) # or it's a local file/directory
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or url.startswith('file:')
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or list(distros_for_url(url)) # or a direct package link
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):
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# then go ahead and process it now
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self.scan_url(url)
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else:
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# otherwise, defer retrieval till later
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self.to_scan.append(url)
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def prescan(self):
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"""Scan urls scheduled for prescanning (e.g. --find-links)"""
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if self.to_scan:
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map(self.scan_url, self.to_scan)
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self.to_scan = None # from now on, go ahead and process immediately
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def download(self, spec, tmpdir):
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"""Locate and/or download `spec` to `tmpdir`, returning a local path
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`spec` may be a ``Requirement`` object, or a string containing a URL,
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an existing local filename, or a project/version requirement spec
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(i.e. the string form of a ``Requirement`` object). If it is the URL
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of a .py file with an unambiguous ``#egg=name-version`` tag (i.e., one
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that escapes ``-`` as ``_`` throughout), a trivial ``setup.py`` is
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automatically created alongside the downloaded file.
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If `spec` is a ``Requirement`` object or a string containing a
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project/version requirement spec, this method returns the location of
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a matching distribution (possibly after downloading it to `tmpdir`).
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If `spec` is a locally existing file or directory name, it is simply
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returned unchanged. If `spec` is a URL, it is downloaded to a subpath
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of `tmpdir`, and the local filename is returned. Various errors may be
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raised if a problem occurs during downloading.
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"""
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if not isinstance(spec,Requirement):
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scheme = URL_SCHEME(spec)
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if scheme:
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# It's a url, download it to tmpdir
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found = self._download_url(scheme.group(1), spec, tmpdir)
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base, fragment = egg_info_for_url(spec)
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if base.endswith('.py'):
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found = self.gen_setup(found,fragment,tmpdir)
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return found
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elif os.path.exists(spec):
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# Existing file or directory, just return it
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return spec
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else:
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try:
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spec = Requirement.parse(spec)
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except ValueError:
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raise DistutilsError(
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"Not a URL, existing file, or requirement spec: %r" %
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(spec,)
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)
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return getattr(self.fetch_distribution(spec, tmpdir),'location',None)
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def fetch_distribution(self,
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requirement, tmpdir, force_scan=False, source=False, develop_ok=False
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):
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"""Obtain a distribution suitable for fulfilling `requirement`
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`requirement` must be a ``pkg_resources.Requirement`` instance.
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If necessary, or if the `force_scan` flag is set, the requirement is
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searched for in the (online) package index as well as the locally
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installed packages. If a distribution matching `requirement` is found,
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the returned distribution's ``location`` is the value you would have
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gotten from calling the ``download()`` method with the matching
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distribution's URL or filename. If no matching distribution is found,
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``None`` is returned.
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If the `source` flag is set, only source distributions and source
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checkout links will be considered. Unless the `develop_ok` flag is
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set, development and system eggs (i.e., those using the ``.egg-info``
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format) will be ignored.
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"""
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# process a Requirement
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self.info("Searching for %s", requirement)
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skipped = {}
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def find(req):
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# Find a matching distribution; may be called more than once
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for dist in self[req.key]:
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if dist.precedence==DEVELOP_DIST and not develop_ok:
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if dist not in skipped:
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self.warn("Skipping development or system egg: %s",dist)
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skipped[dist] = 1
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continue
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if dist in req and (dist.precedence<=SOURCE_DIST or not source):
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self.info("Best match: %s", dist)
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return dist.clone(
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location=self.download(dist.location, tmpdir)
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)
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if force_scan:
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self.prescan()
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self.find_packages(requirement)
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dist = find(requirement)
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if dist is None and self.to_scan is not None:
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self.prescan()
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dist = find(requirement)
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if dist is None and not force_scan:
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self.find_packages(requirement)
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dist = find(requirement)
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if dist is None:
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self.warn(
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"No local packages or download links found for %s%s",
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(source and "a source distribution of " or ""),
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requirement,
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)
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return dist
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def fetch(self, requirement, tmpdir, force_scan=False, source=False):
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"""Obtain a file suitable for fulfilling `requirement`
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DEPRECATED; use the ``fetch_distribution()`` method now instead. For
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backward compatibility, this routine is identical but returns the
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``location`` of the downloaded distribution instead of a distribution
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object.
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"""
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dist = self.fetch_distribution(requirement,tmpdir,force_scan,source)
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if dist is not None:
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return dist.location
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return None
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def gen_setup(self, filename, fragment, tmpdir):
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match = EGG_FRAGMENT.match(fragment); #import pdb; pdb.set_trace()
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dists = match and [d for d in
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interpret_distro_name(filename, match.group(1), None) if d.version
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] or []
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if len(dists)==1: # unambiguous ``#egg`` fragment
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basename = os.path.basename(filename)
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# Make sure the file has been downloaded to the temp dir.
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if os.path.dirname(filename) != tmpdir:
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dst = os.path.join(tmpdir, basename)
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from setuptools.command.easy_install import samefile
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if not samefile(filename, dst):
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shutil.copy2(filename, dst)
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filename=dst
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file = open(os.path.join(tmpdir, 'setup.py'), 'w')
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file.write(
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"from setuptools import setup\n"
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"setup(name=%r, version=%r, py_modules=[%r])\n"
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% (
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dists[0].project_name, dists[0].version,
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os.path.splitext(basename)[0]
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)
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)
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file.close()
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return filename
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elif match:
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raise DistutilsError(
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"Can't unambiguously interpret project/version identifier %r; "
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"any dashes in the name or version should be escaped using "
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"underscores. %r" % (fragment,dists)
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)
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else:
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raise DistutilsError(
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"Can't process plain .py files without an '#egg=name-version'"
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" suffix to enable automatic setup script generation."
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)
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dl_blocksize = 8192
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def _download_to(self, url, filename):
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self.url_ok(url,True) # raises error if not allowed
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self.info("Downloading %s", url)
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# Download the file
|
|
fp, tfp, info = None, None, None
|
|
try:
|
|
if '#' in url:
|
|
url, info = url.split('#', 1)
|
|
fp = self.open_url(url)
|
|
if isinstance(fp, urllib2.HTTPError):
|
|
raise DistutilsError(
|
|
"Can't download %s: %s %s" % (url, fp.code,fp.msg)
|
|
)
|
|
cs = md5()
|
|
headers = fp.info()
|
|
blocknum = 0
|
|
bs = self.dl_blocksize
|
|
size = -1
|
|
if "content-length" in headers:
|
|
size = int(headers["Content-Length"])
|
|
self.reporthook(url, filename, blocknum, bs, size)
|
|
tfp = open(filename,'wb')
|
|
while True:
|
|
block = fp.read(bs)
|
|
if block:
|
|
cs.update(block)
|
|
tfp.write(block)
|
|
blocknum += 1
|
|
self.reporthook(url, filename, blocknum, bs, size)
|
|
else:
|
|
break
|
|
if info: self.check_md5(cs, info, filename, tfp)
|
|
return headers
|
|
finally:
|
|
if fp: fp.close()
|
|
if tfp: tfp.close()
|
|
|
|
def reporthook(self, url, filename, blocknum, blksize, size):
|
|
pass # no-op
|
|
|
|
def retry_sf_download(self, url, filename):
|
|
try:
|
|
return self._download_to(url, filename)
|
|
except:
|
|
scheme, server, path, param, query, frag = urlparse.urlparse(url)
|
|
if server!='dl.sourceforge.net':
|
|
raise
|
|
|
|
mirror = get_sf_ip()
|
|
|
|
while _sf_mirrors:
|
|
self.warn("Download failed: %s", sys.exc_info()[1])
|
|
url = urlparse.urlunparse((scheme, mirror, path, param, '', frag))
|
|
try:
|
|
return self._download_to(url, filename)
|
|
except:
|
|
_sf_mirrors.remove(mirror) # don't retry the same mirror
|
|
mirror = get_sf_ip()
|
|
|
|
raise # fail if no mirror works
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def open_url(self, url):
|
|
try:
|
|
return urllib2.urlopen(url)
|
|
except urllib2.HTTPError, v:
|
|
return v
|
|
except urllib2.URLError, v:
|
|
raise DistutilsError("Download error: %s" % v.reason)
|
|
|
|
|
|
def _download_url(self, scheme, url, tmpdir):
|
|
|
|
# Determine download filename
|
|
#
|
|
name = filter(None,urlparse.urlparse(url)[2].split('/'))
|
|
if name:
|
|
name = name[-1]
|
|
while '..' in name:
|
|
name = name.replace('..','.').replace('\\','_')
|
|
else:
|
|
name = "__downloaded__" # default if URL has no path contents
|
|
|
|
if name.endswith('.egg.zip'):
|
|
name = name[:-4] # strip the extra .zip before download
|
|
|
|
filename = os.path.join(tmpdir,name)
|
|
|
|
# Download the file
|
|
#
|
|
if scheme=='svn' or scheme.startswith('svn+'):
|
|
return self._download_svn(url, filename)
|
|
else:
|
|
headers = self.retry_sf_download(url, filename)
|
|
if 'html' in headers['content-type'].lower():
|
|
return self._download_html(url, headers, filename, tmpdir)
|
|
else:
|
|
return filename
|
|
|
|
def scan_url(self, url):
|
|
self.process_url(url, True)
|
|
|
|
|
|
def _download_html(self, url, headers, filename, tmpdir):
|
|
file = open(filename)
|
|
for line in file:
|
|
if line.strip():
|
|
# Check for a subversion index page
|
|
if re.search(r'<title>Revision \d+:', line):
|
|
# it's a subversion index page:
|
|
file.close()
|
|
os.unlink(filename)
|
|
return self._download_svn(url, filename)
|
|
break # not an index page
|
|
file.close()
|
|
os.unlink(filename)
|
|
raise DistutilsError("Unexpected HTML page found at "+url)
|
|
|
|
def _download_svn(self, url, filename):
|
|
url = url.split('#',1)[0] # remove any fragment for svn's sake
|
|
self.info("Doing subversion checkout from %s to %s", url, filename)
|
|
os.system("svn checkout -q %s %s" % (url, filename))
|
|
return filename
|
|
|
|
def debug(self, msg, *args):
|
|
log.debug(msg, *args)
|
|
|
|
def info(self, msg, *args):
|
|
log.info(msg, *args)
|
|
|
|
def warn(self, msg, *args):
|
|
log.warn(msg, *args)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
def fix_sf_url(url):
|
|
scheme, server, path, param, query, frag = urlparse.urlparse(url)
|
|
if server!='prdownloads.sourceforge.net':
|
|
return url
|
|
return urlparse.urlunparse(
|
|
(scheme, 'dl.sourceforge.net', 'sourceforge'+path, param, '', frag)
|
|
)
|
|
|
|
_sf_mirrors = []
|
|
|
|
def get_sf_ip():
|
|
if not _sf_mirrors:
|
|
try:
|
|
_sf_mirrors[:] = socket.gethostbyname_ex('dl.sourceforge.net')[-1]
|
|
except socket.error:
|
|
# DNS-bl0ck1n9 f1r3w4llz sUx0rs!
|
|
_sf_mirrors[:] = ['dl.sourceforge.net']
|
|
return random.choice(_sf_mirrors)
|