termux-packages/scripts/buildorder.py

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#!/usr/bin/env python3
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"Script to generate a build order respecting package dependencies."
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import os
import re
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import sys
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from itertools import filterfalse
def unique_everseen(iterable, key=None):
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"""List unique elements, preserving order. Remember all elements ever seen.
See https://docs.python.org/3/library/itertools.html#itertools-recipes
Examples:
unique_everseen('AAAABBBCCDAABBB') --> A B C D
unique_everseen('ABBCcAD', str.lower) --> A B C D"""
seen = set()
seen_add = seen.add
if key is None:
for element in filterfalse(seen.__contains__, iterable):
seen_add(element)
yield element
else:
for element in iterable:
k = key(element)
if k not in seen:
seen_add(k)
yield element
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def die(msg):
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"Exit the process with an error message."
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sys.exit('ERROR: ' + msg)
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def parse_build_file_dependencies(path):
"Extract the dependencies of a build.sh or *.subpackage.sh file."
pkg_dep_prefix = 'TERMUX_PKG_DEPENDS='
pkg_build_dep_prefix = 'TERMUX_PKG_BUILD_DEPENDS='
subpkg_dep_prefix = 'TERMUX_SUBPKG_DEPENDS='
dependencies = []
with open(path, encoding="utf-8") as build_script:
prefix = None
for line in build_script:
if line.startswith(pkg_dep_prefix):
prefix = pkg_dep_prefix
elif line.startswith(pkg_build_dep_prefix):
prefix = pkg_build_dep_prefix
elif line.startswith(subpkg_dep_prefix):
prefix = subpkg_dep_prefix
else:
continue
dependencies_string = line[len(prefix):]
for char in "\"'\n":
dependencies_string = dependencies_string.replace(char, '')
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for dependency_value in dependencies_string.split(','):
# Replace parenthesis to ignore version qualifiers as in "gcc (>= 5.0)":
dependency_value = re.sub(r'\(.*?\)', '', dependency_value).strip()
dependency_value = re.sub('-dev$', '', dependency_value)
dependencies.append(dependency_value)
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return set(dependencies)
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class TermuxPackage(object):
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"A main package definition represented by a directory with a build.sh file."
def __init__(self, dir_path):
self.dir = dir_path
self.name = os.path.basename(self.dir)
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# search package build.sh
build_sh_path = os.path.join(self.dir, 'build.sh')
if not os.path.isfile(build_sh_path):
raise Exception("build.sh not found for package '" + self.name + "'")
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self.deps = parse_build_file_dependencies(build_sh_path)
if 'libandroid-support' not in self.deps and self.name != 'libandroid-support':
# Every package may depend on libandroid-support without declaring it:
self.deps.add('libandroid-support')
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# search subpackages
self.subpkgs = []
for filename in os.listdir(self.dir):
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if not filename.endswith('.subpackage.sh'):
continue
subpkg = TermuxSubPackage(self.dir + '/' + filename, self)
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self.subpkgs.append(subpkg)
self.deps |= subpkg.deps
# Do not depend on itself
self.deps.discard(self.name)
# Do not depend on any sub package
self.deps.difference_update([subpkg.name for subpkg in self.subpkgs])
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self.needed_by = set() # Populated outside constructor, reverse of deps.
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def __repr__(self):
return "<{} '{}'>".format(self.__class__.__name__, self.name)
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def recursive_dependencies(self, pkgs_map):
"All the dependencies of the package, both direct and indirect."
result = []
for dependency_name in sorted(self.deps):
dependency_package = pkgs_map[dependency_name]
result += dependency_package.recursive_dependencies(pkgs_map)
result += [dependency_package]
return unique_everseen(result)
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class TermuxSubPackage:
"A sub-package represented by a ${PACKAGE_NAME}.subpackage.sh file."
def __init__(self, subpackage_file_path, parent):
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if parent is None:
raise Exception("SubPackages should have a parent")
self.name = os.path.basename(subpackage_file_path).split('.subpackage.sh')[0]
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self.parent = parent
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self.deps = parse_build_file_dependencies(subpackage_file_path)
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def __repr__(self):
return "<{} '{}' parent='{}'>".format(self.__class__.__name__, self.name, self.parent)
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def read_packages_from_directories(directories):
"""Construct a map from package name to TermuxPackage.
For subpackages this maps from the subpackage name to the parent package."""
pkgs_map = {}
all_packages = []
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for package_dir in directories:
for pkgdir_name in sorted(os.listdir(package_dir)):
dir_path = package_dir + '/' + pkgdir_name
if os.path.isfile(dir_path + '/build.sh'):
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new_package = TermuxPackage(package_dir + '/' + pkgdir_name)
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if new_package.name in pkgs_map:
die('Duplicated package: ' + new_package.name)
else:
pkgs_map[new_package.name] = new_package
all_packages.append(new_package)
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for subpkg in new_package.subpkgs:
if subpkg.name in pkgs_map:
die('Duplicated package: ' + subpkg.name)
else:
pkgs_map[subpkg.name] = new_package
all_packages.append(subpkg)
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for pkg in all_packages:
for dependency_name in pkg.deps:
if dependency_name not in pkgs_map:
die('Package %s depends on non-existing package "%s"' % (pkg.name, dependency_name))
dep_pkg = pkgs_map[dependency_name]
if not isinstance(pkg, TermuxSubPackage):
dep_pkg.needed_by.add(pkg)
return pkgs_map
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def generate_full_buildorder(pkgs_map):
"Generate a build order for building all packages."
build_order = []
# List of all TermuxPackages without dependencies
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leaf_pkgs = [pkg for name, pkg in pkgs_map.items() if not pkg.deps]
if not leaf_pkgs:
die('No package without dependencies - where to start?')
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# Sort alphabetically:
pkg_queue = sorted(leaf_pkgs, key=lambda p: p.name)
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# Topological sorting
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visited = set()
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# Tracks non-visited deps for each package
remaining_deps = {}
for name, pkg in pkgs_map.items():
remaining_deps[name] = set(pkg.deps)
for subpkg in pkg.subpkgs:
remaining_deps[subpkg.name] = set(subpkg.deps)
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while pkg_queue:
pkg = pkg_queue.pop(0)
if pkg.name in visited:
continue
# print("Processing {}:".format(pkg.name), pkg.needed_by)
visited.add(pkg.name)
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build_order.append(pkg)
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for other_pkg in sorted(pkg.needed_by, key=lambda p: p.name):
# Remove this pkg from deps
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remaining_deps[other_pkg.name].discard(pkg.name)
# ... and all its subpackages
remaining_deps[other_pkg.name].difference_update(
[subpkg.name for subpkg in pkg.subpkgs]
)
if not remaining_deps[other_pkg.name]: # all deps were already appended?
pkg_queue.append(other_pkg) # should be processed
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if set(pkgs_map.values()) != set(build_order):
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print("ERROR: Cycle exists. Remaining: ")
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for name, pkg in pkgs_map.items():
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if pkg not in build_order:
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print(name, remaining_deps[name])
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sys.exit(1)
return build_order
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def generate_target_buildorder(target_path, pkgs_map):
"Generate a build order for building the dependencies of the specified package."
if target_path.endswith('/'):
target_path = target_path[:-1]
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package_name = os.path.basename(target_path)
package = pkgs_map[package_name]
return package.recursive_dependencies(pkgs_map)
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def main():
"Generate the build order either for all packages or a specific one."
packages_directories = ['packages']
full_buildorder = len(sys.argv) == 1
if not full_buildorder:
packages_real_path = os.path.realpath('packages')
for path in sys.argv[1:]:
if not os.path.isdir(path):
die('Not a directory: ' + path)
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if path.endswith('/'):
path = path[:-1]
parent_path = os.path.dirname(path)
if packages_real_path != os.path.realpath(parent_path):
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packages_directories.append(parent_path)
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pkgs_map = read_packages_from_directories(packages_directories)
if full_buildorder:
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build_order = generate_full_buildorder(pkgs_map)
else:
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build_order = generate_target_buildorder(sys.argv[1], pkgs_map)
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for pkg in build_order:
print(pkg.dir)
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if __name__ == '__main__':
main()