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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Create a Baserock .lorry file for a given Python package
#
# Copyright © 2014, 2015 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 logging
import yaml
import pkg_resources
from importer_python_common import *
def fetch_package_metadata(package_name):
try:
result = requests.get('%s/%s/json' % (PYPI_URL, package_name))
# raise exception if status code is not 200 OK
result.raise_for_status()
except Exception as e:
error("Couldn't fetch package metadata:", e)
return result.json()
def find_repo_type(url):
# Don't bother with detection if we can't get a 200 OK
logging.debug("Getting '%s' ..." % url)
status_code = requests.get(url).status_code
if status_code != 200:
logging.debug('Got %d status code from %s, aborting repo detection'
% (status_code, url))
return None
logging.debug('200 OK for %s' % url)
logging.debug('Finding repo type for %s' % url)
vcss = [('git', 'clone'), ('hg', 'clone'),
('svn', 'checkout'), ('bzr', 'branch')]
for (vcs, vcs_command) in vcss:
logging.debug('Trying %s %s' % (vcs, vcs_command))
tempdir = tempfile.mkdtemp()
p = subprocess.Popen([vcs, vcs_command, url], stdout=subprocess.PIPE,
stderr=subprocess.STDOUT, stdin=subprocess.PIPE,
cwd=tempdir)
# We close stdin on parent side to prevent the child from blocking
# if it reads on stdin
p.stdin.close()
while True:
line = p.stdout.readline()
if line == '':
break
logging.debug(line.rstrip('\n'))
p.wait() # even with eof on both streams, we still wait
shutil.rmtree(tempdir)
if p.returncode == 0:
logging.debug('%s is a %s repo' % (url, vcs))
return vcs
logging.debug("%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(lorry_prefix, package_name, url):
name = '%s/%s' % (lorry_prefix, package_name)
# TODO: shouldn't have 'x-products-python' field hardcoded here either
lorry = {'type': 'tarball',
'url': url,
'x-products-python': [package_name]}
compression = get_compression(url)
if compression:
lorry['compression'] = compression
return json.dumps({name + "-tarball": lorry}, indent=4, sort_keys=True)
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 get_releases(client, requirement):
try:
releases = client.package_releases(requirement.project_name)
except Exception as e:
error("Couldn't fetch release data:", e)
return releases
def generate_tarball_lorry(lorry_prefix, client, requirement):
releases = get_releases(client, requirement)
if len(releases) == 0:
error("Couldn't find any releases for package %s"
% requirement.project_name)
releases = [v for v in releases if specs_satisfied(v, requirement.specs)]
if len(releases) == 0:
error("Couldn't find any releases of %s"
" that satisfy version constraints: %s"
% (requirement.project_name, requirement.specs))
release_version = releases[0]
logging.debug('Fetching urls for package %s with version %s'
% (requirement.project_name, release_version))
try:
# Get a list of dicts, the dicts contain the urls.
urls = client.release_urls(requirement.project_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['url'])
error("Cannot proceed")
else:
error("Couldn't find any download urls for package %s"
% requirement.project_name)
url = urls[0]['url']
return make_tarball_lorry(lorry_prefix, requirement.project_name, url)
def str_repo_lorry(lorry_prefix, package_name, repo_type, url):
name = '%s/%s' % (lorry_prefix, package_name)
# TODO: this products field 'x-products-python'
# probably shouldn't be hardcoded here
return json.dumps({name: {'type': repo_type,
'url': url,
'x-products-python': [package_name]}},
indent=4, sort_keys=True)
class PythonLorryExtension(ImportExtension):
def __init__(self):
super(PythonLorryExtension, self).__init__()
def run(self):
if len(sys.argv) != 2:
# 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)
client = xmlrpclib.ServerProxy(PYPI_URL)
req = pkg_resources.parse_requirements(sys.argv[1]).next()
with open(self.local_data_path('python.yaml')) as f:
lorry_prefix = yaml.load(f)['lorry-prefix']
new_proj_name = name_or_closest(client, req.project_name)
if new_proj_name == None:
error("Couldn't find any project with name '%s'" % req.project_name)
logging.debug('Treating %s as %s' % (req.project_name, new_proj_name))
req.project_name = new_proj_name
metadata = fetch_package_metadata(req.project_name)
info = metadata['info']
repo_type = (find_repo_type(info['home_page'])
if 'home_page' in info else None)
if repo_type:
print(str_repo_lorry(lorry_prefix, req.project_name,
repo_type, info['home_page']))
else:
print(generate_tarball_lorry(lorry_prefix, client, req))
if __name__ == '__main__':
PythonLorryExtension().run()
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