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requirements.py
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Sun, Nov 10, 11:43

requirements.py
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#!/usr/bin/env python2
#
# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2013, 2014, 2015 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Generate minimal requirements from `setup.py` + `requirements-devel.txt`."""
from __future__ import print_function
import argparse
import re
import sys
import mock
import pkg_resources
import setuptools
def parse_set(string):
"""Parse set from comma separated string."""
string = string.strip()
if string:
return set(string.split(","))
else:
return set()
def minver_error(pkg_name):
"""Report error about missing minimum version constraint and exit."""
print(
"ERROR: specify minimal version of '{}' using '>=' or '=='".format(pkg_name),
file=sys.stderr
)
sys.exit(1)
def parse_pip_file(path):
"""Parse pip requirements file."""
# requirement lines sorted by importance
# also collect other pip commands
rdev = dict()
rnormal = []
stuff = []
try:
with open(path) as f:
for line in f:
line = line.strip()
# see https://pip.readthedocs.org/en/1.1/requirements.html
if line.startswith("-e"):
# devel requirement
splitted = line.split("#egg=")
rdev[splitted[1].lower()] = line
elif line.startswith("-r"):
# recursive file command
splitted = re.split("-r\\s+", line)
subrdev, subrnormal, substuff = parse_pip_file(splitted[1])
for k, v in subrdev.iteritems():
if k not in rdev:
rdev[k] = v
rnormal.extend(subrnormal)
result.extend(substuff)
elif line.startswith("-"):
# another special command we don't recognize
stuff.append(line)
else:
# ordenary requirement, similary to them used in setup.py
rnormal.append(line)
except IOError:
print(
"Warning: could not parse requirements file '{}'!",
file=sys.stderr
)
return rdev, rnormal, stuff
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description="Calculates requirements for different purposes",
formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
parser.add_argument(
"-l", "--level",
choices=["min", "pypi", "dev"],
default="pypi",
help="Specifies desired requirements level."
"'min' requests the minimal requirement that is specified, "
"'pypi' requests the maximum version that satisfies the "
"constrains and is available in PyPi. "
"'dev' includes experimental developer versions for VCSs."
)
parser.add_argument(
"-e", "--extras",
default="",
help="Comma separated list of extras.",
type=parse_set
)
args = parser.parse_args()
result = dict()
requires = []
stuff = []
if args.level == "dev":
result, requires, stuff = parse_pip_file("requirements-devel.txt")
with mock.patch.object(setuptools, 'setup') as mock_setup:
import setup
assert setup # silence warning about unused imports
# called arguments are in `mock_setup.call_args`
mock_args, mock_kwargs = mock_setup.call_args
requires = mock_kwargs.get('install_requires', [])
requires_extras = mock_kwargs.get('extras_require', {})
for e in args.extras:
if e in requires_extras:
requires.extend(requires_extras[e])
for pkg in pkg_resources.parse_requirements(requires):
# skip things we already know
# FIXME be smarter about merging things
if pkg.key in result:
continue
specs = dict(pkg.specs)
if ((">=" in specs) and (">" in specs)) \
or (("<=" in specs) and ("<" in specs)):
print(
"ERROR: Do not specify such weird constraints! ('{}')".format(pkg),
file=sys.stderr
)
sys.exit(1)
if '==' in specs:
result[pkg.key] = "{}=={}".format(pkg.project_name, specs['=='])
elif '>=' in specs:
if args.level == "min":
result[pkg.key] = "{}=={}".format(pkg.project_name, specs['>='])
else:
result[pkg.key] = pkg
elif '>' in specs:
if args.level == "min":
minver_error(pkg.project_name)
else:
result[pkg.key] = pkg
else:
if args.level == "min":
minver_error(pkg.project_name)
else:
result[pkg.key] = pkg
for s in stuff:
print(s)
for k in sorted(result.iterkeys()):
print(result[k])

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