zeroinstall/injector/__init__.py

   1 """
   2 Code relating to interfaces and policies.
   3
   4 To run a program using the injector, the following steps are typical:
   5
   6  1. Instantiate a L{policy.Policy}, giving it the root interface's URI.
   7  2. Ask the policy object to choose a set of implementations.
   8    1. The policy will try to find a compatible set of implementations that meet the user's policy
   9       and work on the current L{arch}itecture, using a L{solve.Solver}.
  10    2. The solver looks up feeds in the L{iface_cache}.
  11    3. The policy will L{fetch} any feeds that are missing or out of date.
  12    4. The cached or downloaded XML is parsed into a L{model} using the L{reader} module.
  13  3. Download the selected implementations and L{zerostore.unpack} into the L{zerostore}.
  14  4. Finally, L{run} the program.
  15
  16 The L{cli} module provides the B{0launch} command-line interface.
  17 """