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#! /usr/bin/env nix-shell
#! nix-shell -i python3 -p "python3.withPackages (ps: with ps; [ ])"
#
# This script downloads https://github.com/home-assistant/home-assistant/blob/master/requirements_all.txt.
# This file contains lines of the form
#
# # homeassistant.components.foo
# # homeassistant.components.bar
# foobar==1.2.3
#
# i.e. it lists dependencies and the components that require them.
# By parsing the file, a dictionary mapping component to dependencies is created.
# For all of these dependencies, Nixpkgs' python3Packages are searched for appropriate names.
# Then, a Nix attribute set mapping component name to dependencies is created.
from urllib.request import urlopen
from collections import OrderedDict
import subprocess
import os
import sys
import json
import re
GENERAL_PREFIX = '# homeassistant.'
COMPONENT_PREFIX = GENERAL_PREFIX + 'components.'
PKG_SET = 'python3Packages'
def get_version():
with open(os.path.dirname(sys.argv[0]) + '/default.nix') as f:
m = re.search('hassVersion = "([\\d\\.]+)";', f.read())
return m.group(1)
def fetch_reqs(version='master'):
requirements = {}
with urlopen('https://github.com/home-assistant/home-assistant/raw/{}/requirements_all.txt'.format(version)) as response:
components = []
for line in response.read().decode().splitlines():
if line == '':
components = []
elif line[:len(COMPONENT_PREFIX)] == COMPONENT_PREFIX:
component = line[len(COMPONENT_PREFIX):]
components.append(component)
if component not in requirements:
requirements[component] = []
elif line[:len(GENERAL_PREFIX)] != GENERAL_PREFIX: # skip lines like "# homeassistant.scripts.xyz"
# Some dependencies are commented out because they don't build on all platforms
# Since they are still required for running the component, don't skip them
if line[:2] == '# ':
line = line[2:]
# Some requirements are specified by url, e.g. https://example.org/foobar#xyz==1.0.0
# Therefore, if there's a "#" in the line, only take the part after it
line = line[line.find('#') + 1:]
for component in components:
requirements[component].append(line)
return requirements
# Store a JSON dump of Nixpkgs' python3Packages
output = subprocess.check_output(['nix-env', '-f', os.path.dirname(sys.argv[0]) + '/../../..', '-qa', '-A', PKG_SET, '--json'])
packages = json.loads(output)
def name_to_attr_path(req):
attr_paths = []
names = [req]
# E.g. python-mpd2 is actually called python3.6-mpd2
# instead of python-3.6-python-mpd2 inside Nixpkgs
if req.startswith('python-') or req.startswith('python_'):
names.append(req[len('python-'):])
for name in names:
# treat "-" and "_" equally
name = re.sub('[-_]', '[-_]', name)
pattern = re.compile('^python\\d\\.\\d-{}-\\d'.format(name), re.I)
for attr_path, package in packages.items():
if pattern.match(package['name']):
attr_paths.append(attr_path)
# Let's hope there's only one derivation with a matching name
assert(len(attr_paths) <= 1)
if attr_paths:
return attr_paths[0]
else:
return None
version = get_version()
print('Generating component-packages.nix for version {}'.format(version))
requirements = fetch_reqs(version=version)
build_inputs = {}
for component, reqs in OrderedDict(sorted(requirements.items())).items():
attr_paths = []
for req in reqs:
try:
name = req.split('==')[0]
attr_path = name_to_attr_path(name)
if attr_path is not None:
# Add attribute path without "python3Packages." prefix
attr_paths.append(attr_path[len(PKG_SET + '.'):])
except RequirementParseError:
continue
else:
build_inputs[component] = attr_paths
# Only select components which have any dependency
#build_inputs = {k: v for k, v in build_inputs.items() if len(v) > 0}
with open(os.path.dirname(sys.argv[0]) + '/component-packages.nix', 'w') as f:
f.write('# Generated from parse-requirements.py\n')
f.write('# Do not edit!\n\n')
f.write('{\n')
f.write(' version = "{}";\n'.format(version))
f.write(' components = {\n')
for component, attr_paths in build_inputs.items():
f.write(' "{}" = ps: with ps; [ '.format(component))
f.write(' '.join(attr_paths))
f.write(' ];\n')
f.write(' };\n')
f.write('}\n')
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