zeroinstall/cmd/update.py

   1 """
   2 The B{0install download} command-line interface.
   3 """
   4
   5 # Copyright (C) 2011, Thomas Leonard
   6 # See the README file for details, or visit http://0install.net.
   7
   8 import sys
   9
  10 from zeroinstall import SafeException, _
  11 from zeroinstall.injector import model
  12 from zeroinstall.cmd import UsageError, select
  13
  14 syntax = "URI"
  15
  16 add_options = select.add_generic_select_options
  17
  18 def handle(config, options, args):
  19         if len(args) != 1:
  20                 raise UsageError()
  21
  22         assert not options.offline
  23
  24         iface_uri = model.canonical_iface_uri(args[0])
  25
  26         old_gui = options.gui
  27
  28         # Select once in offline console mode to get the old values
  29         options.offline = True
  30         options.gui = False
  31         options.refresh = False
  32
  33         try:
  34                 old_sels = select.get_selections(config, options, iface_uri,
  35                                         select_only = True, download_only = False, test_callback = None)
  36         except SafeException:
  37                 old_selections = {}
  38         else:
  39                 if old_sels is None:
  40                         old_selections = {}
  41                 else:
  42                         old_selections = old_sels.selections
  43
  44         # Download in online mode to get the new values
  45         options.offline = False
  46         options.gui = old_gui
  47         options.refresh = True
  48
  49         sels = select.get_selections(config, options, iface_uri,
  50                                 select_only = False, download_only = True, test_callback = None)
  51         if not sels:
  52                 sys.exit(1)     # Aborted by user
  53
  54         changes = False
  55
  56         for iface, old_sel in old_selections.iteritems():
  57                 new_sel = sels.selections.get(iface, None)
  58                 if new_sel is None:
  59                         print _("No longer used: %s") % iface
  60                         changes = True
  61                 elif old_sel.version != new_sel.version:
  62                         print _("%s: %s -> %s") % (iface, old_sel.version, new_sel.version)
  63                         changes = True
  64
  65         for iface, new_sel in sels.selections.iteritems():
  66                 if iface not in old_selections:
  67                         print _("%s: new -> %s") % (iface, new_sel.version)
  68                         changes = True
  69
  70         if not changes:
  71                 print _("No updates found.")