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#!/usr/bin/env python
#
# Create a Baserock .lorry file for a given Python package
#
# Copyright (C) 2014 Codethink Limited
#
# This program 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; version 2 of the License.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
from __future__ import print_function
import subprocess
import requests
import json
import sys
import shutil
import tempfile
import xmlrpclib
#import parser.requirements # todo add this as a submodule
# i don't know what i was going on about here
import requirements
PYPI_URL = 'http://pypi.python.org/pypi'
def warn(*args, **kwargs):
print('%s:' % sys.argv[0], *args, file=sys.stderr, **kwargs)
def error(*args, **kwargs):
warn(*args, **kwargs)
sys.exit(1)
def fetch_package_metadata(package_name):
try:
return requests.get('%s/%s/json' % (PYPI_URL, package_name)).json()
except Exception as e:
error("Couldn't fetch package metadata: ", e)
def find_repo_type(url):
print('Finding repo type for %s' % url)
vcss = [('git', 'clone'), ('hg', 'clone'),
('svn', 'checkout'), ('bzr', 'branch')]
for (vcs, vcs_command) in vcss:
print('Trying %s %s' % (vcs, vcs_command))
tempdir = tempfile.mkdtemp()
p = subprocess.Popen([vcs, vcs_command, url], stdout=subprocess.PIPE,
stderr=subprocess.PIPE, cwd=tempdir)
_, _ = p.communicate()
shutil.rmtree(tempdir)
if p.returncode == 0:
print('%s is a %s repo' % (url, vcs))
return vcs
print("%s doesn't seem to be a repo" % url)
return None
def get_compression(url):
bzip = 'bzip2'
gzip = 'gzip'
lzma = 'lzma'
m = {'tar.gz': gzip, 'tgz': gzip, 'tar.Z': gzip,
'tar.bz2': bzip, 'tbz2': bzip,
'tar.lzma': lzma, 'tar.xz': lzma, 'tlz': lzma, 'txz': lzma}
for x in [1, 2]:
ext = '.'.join(url.split('.')[-x:])
if ext in m: return m[ext]
return None
# Assumption: url passed to this function must have a 'standard' tar extension
def make_tarball_lorry(name, url):
lorry = {'type': 'tarball', 'url': url}
compression = get_compression(url)
if compression:
lorry['compression'] = compression
return json.dumps({name.lower() + "-tarball": lorry},
indent=4, sort_keys=True)
def ask_user(client, xs, fn, prompt='--> '):
for n, x in enumerate(xs, 1):
print('[%s]: %s' % (n, fn(x)))
print('')
s = raw_input(prompt)
choice = int(s) if s.isdigit() else None
choice = choice - 1 if choice != None and choice <= len(xs) else None
if choice == None:
print("Invalid choice", file=sys.stderr)
sys.exit(1)
return choice
def filter_urls(urls):
allowed_extensions = ['tar.gz', 'tgz', 'tar.Z', 'tar.bz2', 'tbz2',
'tar.lzma', 'tar.xz', 'tlz', 'txz', 'tar']
def allowed_extension(url):
return ('.'.join(url['url'].split('.')[-2:]) in allowed_extensions
or url['url'].split('.')[-1:] in allowed_extensions)
return filter(allowed_extension, urls)
def specs_satisfied(version, specs):
def mapping_error(op):
# We parse ops with requirements-parser, so any invalid user input
# should be detected there. This really guards against
# the pip developers adding some new operation to a requirement.
error("Invalid op in spec: %s" % op)
opmap = {'==' : lambda x, y: x == y, '!=' : lambda x, y: x != y,
'<=' : lambda x, y: x <= y, '>=' : lambda x, y: x >= y,
'<': lambda x, y: x < y, '>' : lambda x, y: x > y}
def get_op_func(op):
return opmap[op] if op in opmap else lambda x, y: mapping_error(op)
return all([get_op_func(op)(version, sv) for (op, sv) in specs])
def generate_tarball_lorry(requirement):
try:
client = xmlrpclib.ServerProxy(PYPI_URL)
releases = client.package_releases(requirement.name)
except Exception as e:
error("Couldn't fetch release data:", e)
if len(releases) == 0:
error("Couldn't find any releases for package %s" % requirement.name)
releases = [v for v in releases if specs_satisfied(v, requirement.specs)]
if len(releases) == 0:
error("Couldn't find any releases that satisfy version constraints: %s"
% requirement.specs)
def get_description(release):
return client.release_data(requirement.name,
release)['name'] + ' ' + release
choice = (ask_user(client, releases,
get_description, prompt='Select release: ')
if len(releases) > 1 else 0)
release_version = releases[choice]
print('Fetching urls for package %s with version %s'
% (requirement.name, release_version))
try:
urls = client.release_urls(requirement.name, release_version)
except Exception as e:
error("Couldn't fetch release urls:", e)
tarball_urls = filter_urls(urls)
if len(tarball_urls) > 0:
urls = tarball_urls
elif len(urls) > 0:
warn("None of these urls look like tarballs:")
for url in urls:
warn("\t%s", url)
error("Cannot proceed")
else:
error("Couldn't find any download urls for package")
choice = (ask_user(client, urls, lambda url: url['url'],
prompt='Select url: ') if len(urls) > 1 else 0)
url = urls[choice]['url']
return make_tarball_lorry(requirement.name, url)
def str_repo_lorry(package_name, repo_type, url):
return json.dumps({package_name.lower(): {'type': repo_type, 'url': url}},
indent=4, sort_keys=True)
if __name__ == '__main__':
max_args = 2
if len(sys.argv) != max_args:
# TODO explain the format of python requirements
# warn the user that they probably want to quote their arg
# > < will be interpreted as redirection by the shell
print('usage: %s requirement'
% sys.argv[0], file=sys.stderr)
sys.exit(1)
# TODO: We could take multiple reqs easily enough
req = requirements.parse(sys.argv[1]).next()
metadata = fetch_package_metadata(req.name)
info = metadata['info']
repo_type = (find_repo_type(info['home_page'])
if 'home_page' in info else None)
print(str_repo_lorry(req.name, repo_type, info['home_page'])
if repo_type else generate_tarball_lorry(req))
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