nixpkgs/maintainers/scripts/update-python-libraries
Frederik Rietdijk dce1c26e5d Python: fix update script
- use correct extension
- do not update expressions that have an url that does not contain pypi
- show warning in case request fails
2017-05-27 11:29:42 +02:00

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#! /usr/bin/env nix-shell
#! nix-shell -i python3 -p 'python3.withPackages(ps: with ps; [ requests toolz ])'
"""
Update a Python package expression by passing in the `.nix` file, or the directory containing it.
You can pass in multiple files or paths.
You'll likely want to use
``
$ ./update-python-libraries ../../pkgs/development/python-modules/*
``
to update all libraries in that folder.
"""
import argparse
import logging
import os
import re
import requests
import toolz
INDEX = "https://pypi.io/pypi"
"""url of PyPI"""
EXTENSIONS = ['tar.gz', 'tar.bz2', 'tar', 'zip', '.whl']
"""Permitted file extensions. These are evaluated from left to right and the first occurance is returned."""
def _get_value(attribute, text):
"""Match attribute in text and return it."""
regex = '{}\s+=\s+"(.*)";'.format(attribute)
regex = re.compile(regex)
value = regex.findall(text)
n = len(value)
if n > 1:
raise ValueError("Found too many values for {}".format(attribute))
elif n == 1:
return value[0]
else:
raise ValueError("No value found for {}".format(attribute))
def _get_line_and_value(attribute, text):
"""Match attribute in text. Return the line and the value of the attribute."""
regex = '({}\s+=\s+"(.*)";)'.format(attribute)
regex = re.compile(regex)
value = regex.findall(text)
n = len(value)
if n > 1:
raise ValueError("Found too many values for {}".format(attribute))
elif n == 1:
return value[0]
else:
raise ValueError("No value found for {}".format(attribute))
def _replace_value(attribute, value, text):
"""Search and replace value of attribute in text."""
old_line, old_value = _get_line_and_value(attribute, text)
new_line = old_line.replace(old_value, value)
new_text = text.replace(old_line, new_line)
return new_text
def _fetch_page(url):
r = requests.get(url)
if r.status_code == requests.codes.ok:
return r.json()
else:
raise ValueError("Request for {} failed".format(url))
def _get_latest_version(package, extension):
url = "{}/{}/json".format(INDEX, package)
json = _fetch_page(url)
data = extract_relevant_nix_data(json, extension)[1]
version = data['latest_version']
if version in data['versions']:
sha256 = data['versions'][version]['sha256']
else:
sha256 = None # Its possible that no file was uploaded to PyPI
return version, sha256
def extract_relevant_nix_data(json, extension):
"""Extract relevant Nix data from the JSON of a package obtained from PyPI.
:param json: JSON obtained from PyPI
"""
def _extract_license(json):
"""Extract license from JSON."""
return json['info']['license']
def _available_versions(json):
return json['releases'].keys()
def _extract_latest_version(json):
return json['info']['version']
def _get_src_and_hash(json, version, extensions):
"""Obtain url and hash for a given version and list of allowable extensions."""
if not json['releases']:
msg = "Package {}: No releases available.".format(json['info']['name'])
raise ValueError(msg)
else:
# We use ['releases'] and not ['urls'] because we want to have the possibility for different version.
for possible_file in json['releases'][version]:
for extension in extensions:
if possible_file['filename'].endswith(extension):
src = {'url': str(possible_file['url']),
'sha256': str(possible_file['digests']['sha256']),
}
return src
else:
msg = "Package {}: No release with valid file extension available.".format(json['info']['name'])
logging.info(msg)
return None
#raise ValueError(msg)
def _get_sources(json, extensions):
versions = _available_versions(json)
releases = {version: _get_src_and_hash(json, version, extensions) for version in versions}
releases = toolz.itemfilter(lambda x: x[1] is not None, releases)
return releases
# Collect data)
name = str(json['info']['name'])
latest_version = str(_extract_latest_version(json))
#src = _get_src_and_hash(json, latest_version, EXTENSIONS)
sources = _get_sources(json, [extension])
# Collect meta data
license = str(_extract_license(json))
license = license if license != "UNKNOWN" else None
summary = str(json['info'].get('summary')).strip('.')
summary = summary if summary != "UNKNOWN" else None
#description = str(json['info'].get('description'))
#description = description if description != "UNKNOWN" else None
homepage = json['info'].get('home_page')
data = {
'latest_version' : latest_version,
'versions' : sources,
#'src' : src,
'meta' : {
'description' : summary if summary else None,
#'longDescription' : description,
'license' : license,
'homepage' : homepage,
},
}
return name, data
def _update_package(path):
# We need to read and modify a Nix expression.
if os.path.isdir(path):
path = os.path.join(path, 'default.nix')
if not os.path.isfile(path):
logging.warning("Path does not exist: {}".format(path))
return False
if not path.endswith(".nix"):
logging.warning("Path does not end with `.nix`, skipping: {}".format(path))
return False
with open(path, 'r') as f:
text = f.read()
try:
pname = _get_value('pname', text)
except ValueError as e:
logging.warning("Path {}: {}".format(path, str(e)))
return False
try:
version = _get_value('version', text)
except ValueError as e:
logging.warning("Path {}: {}".format(path, str(e)))
return False
# If we use a wheel, then we need to request a wheel as well
try:
format = _get_value('format', text)
except ValueError as e:
# No format mentioned, then we assume we have setuptools
# and use a .tar.gz
logging.info("Path {}: {}".format(path, str(e)))
extension = ".tar.gz"
else:
if format == 'wheel':
extension = ".whl"
else:
try:
url = _get_value('url', text)
extension = os.path.splitext(url)[1]
if 'pypi' not in url:
logging.warning("Path {}: uses non-PyPI url, not updating.".format(path))
return False
except ValueError as e:
logging.info("Path {}: {}".format(path, str(e)))
extension = ".tar.gz"
try:
new_version, new_sha256 = _get_latest_version(pname, extension)
except ValueError as e:
logging.warning("Path {}: {}".format(path, str(e)))
else:
if not new_sha256:
logging.warning("Path has no valid file available: {}".format(path))
return False
if new_version != version:
try:
text = _replace_value('version', new_version, text)
except ValueError as e:
logging.warning("Path {}: {}".format(path, str(e)))
try:
text = _replace_value('sha256', new_sha256, text)
except ValueError as e:
logging.warning("Path {}: {}".format(path, str(e)))
with open(path, 'w') as f:
f.write(text)
logging.info("Updated {} from {} to {}".format(pname, version, new_version))
else:
logging.info("No update available for {} at {}".format(pname, version))
return True
def main():
parser = argparse.ArgumentParser()
parser.add_argument('package', type=str, nargs='+')
args = parser.parse_args()
packages = args.package
count = list(map(_update_package, packages))
#logging.info("{} package(s) updated".format(sum(count)))
if __name__ == '__main__':
main()