buildorder.py: pep8ify

[termux-packages] / buildorder.py

#!/usr/bin/env python3
# buildorder.py - script to generate a build order respecting package dependencies

import os
import sys


def die(msg):
    sys.exit('ERROR: ' + msg)


if len(sys.argv) != 1:
    die('buildorder.py takes no arguments')


class DebianPackage(object):
    def __init__(self, name):
        self.name = name
        self.remaining_dependencies = set()  # String
        self.sub_packages = set()  # String
        self.prerequisite_for = set()  # Packages that needs this package

# List of all DebianPackage:s
all_packages = []

# Mapping from package name to DebianPackage
# (if subpackage, mapping from subpackage name to parent package)
packages_map = {}

packages_dir = 'packages'


for subdir_name in sorted(os.listdir(packages_dir)):
    subdir_path = packages_dir + '/' + subdir_name

    if os.path.exists(subdir_path + '/BROKEN.txt'):
        continue

    build_sh_path = subdir_path + '/build.sh'

    this_package = DebianPackage(subdir_name)
    all_packages.append(this_package)
    packages_map[this_package.name] = this_package

    if not os.path.isfile(build_sh_path):
        die('The directory ' + subdir_name + ' does not contain build.sh')

    with open(build_sh_path) as build_sh_file:
        for line in build_sh_file:
            if line.startswith('TERMUX_PKG_DEPENDS='):
                deps_comma_separated = line[(line.index('=')+2):(len(line)-2)]
                for dep in deps_comma_separated.split(','):
                    dep = dep.strip()
                    if not dep.endswith('libandroid-support-dev'):
                        this_package.remaining_dependencies.add(dep)
    for file_in_subdir_name in sorted(os.listdir(subdir_path)):
        if file_in_subdir_name.endswith('.subpackage.sh'):
            subpackage_name = file_in_subdir_name[0:-len(".subpackage.sh"):]
            this_package.sub_packages.add(subpackage_name)
            packages_map[subpackage_name] = this_package
            with open(subdir_path + '/' + file_in_subdir_name) as subpackage_sh_file:
                for line in subpackage_sh_file:
                    if line.startswith('TERMUX_SUBPKG_DEPENDS='):
                        deps_comma_separated = line[(line.index('=')+2):(len(line)-2)]
                        for dep in deps_comma_separated.split(','):
                            dep = dep.strip()
                            this_package.remaining_dependencies.add(dep)
    # Do not depend on itself
    this_package.remaining_dependencies.discard(this_package.name)
    # Do not depend on any sub package
    this_package.remaining_dependencies.difference_update(this_package.sub_packages)

for package in all_packages:
    for remaining in package.remaining_dependencies:
        if remaining not in packages_map:
            die('Package ' + package.name + ' depends on non-existing package "' + remaining + '"')
        packages_map[remaining].prerequisite_for.add(package)

# List of all DebianPackage:s without dependencies
packages_without_deps = [p for p in all_packages if not p.remaining_dependencies]
if not packages_without_deps:
    die('No package without dependency - where to start?')

# Sort alphabetically, but with libandroid-support first (since dependency on libandroid-support
# does not need to be declared explicitly, so anything might in theory depend on it to build):

packages_without_deps.sort(
    key=lambda p: '' if p.name == 'libandroid-support' else p.name,
    reverse=True)

# Topological sorting
build_order = []
while packages_without_deps:
    pkg = packages_without_deps.pop()
    build_order.append(pkg)
    for other_package in pkg.prerequisite_for:
        # Remove this package
        other_package.remaining_dependencies.discard(pkg.name)
        # .. and all its subpackages
        other_package.remaining_dependencies.difference_update(pkg.sub_packages)
        if not other_package.remaining_dependencies:
            # Check if the other package is ready to build now
            packages_without_deps.append(other_package)

if len(all_packages) != len(build_order):
    print("ERROR: Cycle exists. Remaining: ")
    for pkg in all_packages:
        if pkg not in build_order:
            print(pkg.name)
    sys.exit(1)

for pkg in build_order:
    print(pkg.name)