zeroinstall/injector/__init__.py

   1 """
   2 Code relating to interfaces and policies.
   3
   4 To run a program, the following steps are typical:
   5
   6  1. Create some L{requirements.Requirements}, giving the root interface's URI.
   7  2. Instantiate a L{driver.Driver}, giving it the requirements
   8  3. Ask the driver to choose a set of implementations.
   9    1. The driver will try to find a compatible set of implementations that meet the user's policy
  10       and work on the current L{arch}itecture, using a L{solve.Solver}.
  11    2. The solver looks up feeds in the L{iface_cache}.
  12    3. The driver will L{fetch} any feeds that are missing.
  13    4. The cached or downloaded XML is parsed into a L{model} using the L{reader} module.
  14  4. Download the selected implementations and L{zerostore.unpack} into the L{zerostore}.
  15  5. Finally, L{run} the program.
  16
  17 The L{cli} module provides the B{0launch} command-line interface.
  18 """