zeroinstall/injector/arch.py

   1 import os
   2
   3 # os_ranks and mapping are mappings from names to how good they are.
   4 # 1 => Native (best)
   5 # Higher numbers are worse but usable.
   6 _uname = os.uname()
   7
   8 os_ranks = {
   9 #       'Linux' : 3,            # Linux (lots of systems support emulation)
  10         None : 2,               # Any OS
  11         _uname[0] : 1,          # Current OS
  12 }
  13
  14 def _get_machine_ranks():
  15         # Binaries compiled for _this_machine are best...
  16         this_machine = _uname[-1]
  17         machine_ranks = {this_machine : 0}
  18
  19         # If this_machine appears in the first column of this table, all
  20         # following machine types on the line will also run on this one
  21         # (earlier ones preferred):
  22         _machine_matrix = {
  23                 'i486': ['i386'],
  24                 'i586': ['i486', 'i386'],
  25                 'i686': ['i586', 'i486', 'i386'],
  26                 'ppc64': ['ppc32'],
  27         }
  28         for supported in _machine_matrix.get(this_machine, []):
  29                 machine_ranks[supported] = len(machine_ranks)
  30
  31         # At the lowest priority, try a machine-independant implementation
  32         machine_ranks[None] = len(machine_ranks)
  33         return machine_ranks
  34
  35 machine_ranks = _get_machine_ranks()
  36 #print machine_ranks