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from spack import *
import spack
import os
import re
from contextlib import closing
class Python(Package):
"""The Python programming language."""
homepage = "http://www.python.org"
url = "http://www.python.org/ftp/python/2.7.8/Python-2.7.8.tar.xz"
extendable = True
version('2.7.8', 'd235bdfa75b8396942e360a70487ee00')
depends_on("openssl")
depends_on("bzip2")
depends_on("readline")
depends_on("ncurses")
depends_on("sqlite")
def install(self, spec, prefix):
# Need this to allow python build to find the Python installation.
env['PYTHONHOME'] = prefix
# Rest of install is pretty standard.
configure("--prefix=%s" % prefix,
"--with-threads",
"--enable-shared")
make()
make("install")
# ========================================================================
# Set up environment to make install easy for python extensions.
# ========================================================================
@property
def python_lib_dir(self):
return os.path.join('lib', 'python%d.%d' % self.version[:2])
@property
def site_packages_dir(self):
return os.path.join(self.python_lib_dir, 'site-packages')
def setup_extension_environment(self, module, spec, ext_spec):
"""Called before python modules' install() methods.
In most cases, extensions will only need to have one line::
python('setup.py', 'install', '--prefix=%s' % prefix)
"""
# Python extension builds can have a global python executable function
module.python = Executable(join_path(spec.prefix.bin, 'python'))
# Add variables for lib/pythonX.Y and lib/pythonX.Y/site-packages dirs.
module.python_lib_dir = os.path.join(ext_spec.prefix, self.python_lib_dir)
module.site_packages_dir = os.path.join(ext_spec.prefix, self.site_packages_dir)
# Add site packages directory to the PYTHONPATH
os.environ['PYTHONPATH'] = module.site_packages_dir
# Make the site packages directory if it does not exist already.
mkdirp(module.site_packages_dir)
# ========================================================================
# Handle specifics of activating and deactivating python modules.
# ========================================================================
def python_ignore(self, ext_pkg, args):
"""Add some ignore files to activate/deactivate args."""
orig_ignore = args.get('ignore', lambda f: False)
def ignore(filename):
# Always ignore easy-install.pth, as it needs to be merged.
patterns = [r'easy-install\.pth$']
# Ignore pieces of setuptools installed by other packages.
if ext_pkg.name != 'py-setuptools':
patterns.append(r'/site\.pyc?$')
patterns.append(r'setuptools\.pth')
patterns.append(r'bin/easy_install[^/]*$')
patterns.append(r'setuptools.*egg$')
return (any(re.search(p, filename) for p in patterns) or
orig_ignore(filename))
return ignore
def write_easy_install_pth(self, extensions):
paths = []
for ext in extensions:
ext_site_packages = os.path.join(ext.prefix, self.site_packages_dir)
easy_pth = "%s/easy-install.pth" % ext_site_packages
if not os.path.isfile(easy_pth):
continue
with closing(open(easy_pth)) as f:
for line in f:
line = line.rstrip()
# Skip lines matching these criteria
if not line: continue
if re.search(r'^(import|#)', line): continue
if (ext.name != 'py-setuptools' and
re.search(r'setuptools.*egg$', line)): continue
paths.append(line)
site_packages = os.path.join(self.prefix, self.site_packages_dir)
main_pth = "%s/easy-install.pth" % site_packages
if not paths:
if os.path.isfile(main_pth):
os.remove(main_pth)
else:
with closing(open(main_pth, 'w')) as f:
f.write("import sys; sys.__plen = len(sys.path)\n")
for path in paths:
f.write("%s\n" % path)
f.write("import sys; new=sys.path[sys.__plen:]; del sys.path[sys.__plen:]; "
"p=getattr(sys,'__egginsert',0); sys.path[p:p]=new; sys.__egginsert = p+len(new)\n")
def activate(self, ext_pkg, **args):
args.update(ignore=self.python_ignore(ext_pkg, args))
super(Python, self).activate(ext_pkg, **args)
extensions = set(spack.install_layout.get_extensions(self.spec))
extensions.add(ext_pkg.spec)
self.write_easy_install_pth(extensions)
def deactivate(self, ext_pkg, **args):
args.update(ignore=self.python_ignore(ext_pkg, args))
super(Python, self).deactivate(ext_pkg, **args)
extensions = set(spack.install_layout.get_extensions(self.spec))
extensions.remove(ext_pkg.spec)
self.write_easy_install_pth(extensions)
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