chiark - git - mdw - termux-packages/blob - buildorder.py

   1 #!/usr/bin/env python3
   2 # buildorder.py - script to generate a build order respecting package dependencies
   3
   4 import os, sys
   5
   6 def die(msg): sys.exit('ERROR: ' + msg)
   7
   8 if len(sys.argv) != 1: die('buildorder.py takes no arguments')
   9
  10 class DebianPackage:
  11         def __init__(self, name):
  12                 self.name = name
  13                 self.remaining_dependencies = set()     # String
  14                 self.sub_packages = set()               # String
  15                 self.prerequisite_for = set()           # Packages that needs this package
  16
  17 all_packages = [] # List of all DebianPackage:s
  18 packages_map = {} # Mapping from package name to DebianPackage (if subpackage, mapping from subpackage name to parent package)
  19
  20 packages_dir = 'packages'
  21 for subdir_name in sorted(os.listdir(packages_dir)):
  22         subdir_path = packages_dir + '/' + subdir_name
  23         if os.path.exists(subdir_path + '/BROKEN.txt'): continue
  24         build_sh_path = subdir_path + '/build.sh'
  25
  26         this_package = DebianPackage(subdir_name)
  27         all_packages.append(this_package)
  28         packages_map[this_package.name] = this_package
  29
  30         if not os.path.isfile(build_sh_path): die('The directory ' + subdir_name + ' does not contain build.sh')
  31         with open(build_sh_path) as build_sh_file:
  32                 for line in build_sh_file:
  33                         if line.startswith('TERMUX_PKG_DEPENDS='):
  34                                 deps_comma_separated = line[(line.index('=')+2):(len(line)-2)]
  35                                 for dep in deps_comma_separated.split(','):
  36                                         dep = dep.strip()
  37                                         if not dep.endswith('libandroid-support-dev'): this_package.remaining_dependencies.add(dep)
  38         for file_in_subdir_name in sorted(os.listdir(subdir_path)):
  39                 if file_in_subdir_name.endswith('.subpackage.sh'):
  40                         subpackage_name = file_in_subdir_name[0:-len(".subpackage.sh"):]
  41                         this_package.sub_packages.add(subpackage_name)
  42                         packages_map[subpackage_name] = this_package
  43                         with open(subdir_path + '/' + file_in_subdir_name) as subpackage_sh_file:
  44                                 for line in subpackage_sh_file:
  45                                         if line.startswith('TERMUX_SUBPKG_DEPENDS='):
  46                                                 deps_comma_separated = line[(line.index('=')+2):(len(line)-2)]
  47                                                 for dep in deps_comma_separated.split(','):
  48                                                         dep = dep.strip()
  49                                                         this_package.remaining_dependencies.add(dep)
  50         this_package.remaining_dependencies.discard(this_package.name) # Do not depend on itself
  51         this_package.remaining_dependencies.difference_update(this_package.sub_packages) # Do not depend on any sub package
  52
  53 for package in all_packages:
  54         for remaining in package.remaining_dependencies:
  55                 if not remaining in packages_map: die('Package ' + package.name + ' depends on non-existing package "' + remaining + '"')
  56                 packages_map[remaining].prerequisite_for.add(package)
  57
  58 # List of all DebianPackage:s without dependencies
  59 packages_without_deps = [p for p in all_packages if not p.remaining_dependencies]
  60 if not packages_without_deps: die('No package without dependency - where to start?')
  61
  62 # Sort alphabetically, but with libandroid-support first (since dependency on libandroid-support
  63 # does not need to be declared explicitly, so anything might in theory depend on it to build):
  64 packages_without_deps.sort(key=lambda p: 'aaaa' if p.name == 'libandroid-support' else p.name, reverse=True)
  65
  66 # Topological sorting
  67 build_order = []
  68 while packages_without_deps:
  69         pkg = packages_without_deps.pop()
  70         build_order.append(pkg)
  71         for other_package in pkg.prerequisite_for:
  72                 other_package.remaining_dependencies.discard(pkg.name)                          # Remove this package
  73                 other_package.remaining_dependencies.difference_update(pkg.sub_packages)        # .. and all its subpackages
  74                 if not other_package.remaining_dependencies:
  75                         # Check if the other package is ready to build now
  76                         packages_without_deps.append(other_package)
  77
  78 if len(all_packages) != len(build_order):
  79         print("ERROR: Cycle exists. Remaining: ");
  80         for pkg in all_packages:
  81                 if pkg not in build_order: print(pkg.name)
  82         sys.exit(1)
  83
  84 for pkg in build_order: print(pkg.name)
  85