zeroinstall/cmd/select.py

   1 """
   2 The B{0install select} 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 from optparse import OptionParser
   9 import os, sys
  10 import logging
  11
  12 from zeroinstall import cmd, SafeException, _
  13 from zeroinstall.cmd import UsageError
  14 from zeroinstall.injector import model, autopolicy, selections, handler
  15 from zeroinstall.injector.iface_cache import iface_cache
  16
  17 syntax = "URI"
  18
  19 def add_generic_select_options(parser):
  20         """All options for selecting."""
  21         parser.add_option("", "--before", help=_("choose a version before this"), metavar='VERSION')
  22         parser.add_option("", "--command", help=_("command to select"), metavar='COMMAND')
  23         parser.add_option("", "--cpu", help=_("target CPU type"), metavar='CPU')
  24         parser.add_option("", "--message", help=_("message to display when interacting with user"))
  25         parser.add_option("", "--not-before", help=_("minimum version to choose"), metavar='VERSION')
  26         parser.add_option("-o", "--offline", help=_("try to avoid using the network"), action='store_true')
  27         parser.add_option("", "--os", help=_("target operation system type"), metavar='OS')
  28         parser.add_option("-r", "--refresh", help=_("refresh all used interfaces"), action='store_true')
  29         parser.add_option("-s", "--source", help=_("select source code"), action='store_true')
  30
  31 def add_options(parser):
  32         """Options for 'select' and 'download' (but not 'run')"""
  33         add_generic_select_options(parser)
  34         parser.add_option("", "--xml", help=_("write selected versions as XML"), action='store_true')
  35
  36 def get_selections(options, iface_uri, select_only, download_only, test_callback):
  37         """Get selections for iface_uri, according to the options passed.
  38         Will switch to GUI mode if necessary.
  39         @param options: options from OptionParser
  40         @param iface_uri: canonical URI of the interface
  41         @param select_only: return immediately even if the selected versions aren't cached
  42         @param download_only: wait for stale feeds, and display GUI button as Download, not Run
  43         @return: the selected versions, or None if the user cancels
  44         @rtype: L{selections.Selections} | None
  45         """
  46         root_iface = iface_cache.get_interface(iface_uri)
  47
  48         if os.isatty(1):
  49                 h = handler.ConsoleHandler()
  50         else:
  51                 h = handler.Handler()
  52
  53         command_name = options.command
  54         if command_name is None:
  55                 command_name = 'run'
  56         elif command_name == '':
  57                 command_name = None
  58         policy = autopolicy.AutoPolicy(iface_uri,
  59                                 handler = h,
  60                                 download_only = True,   # unused?
  61                                 src = options.source,
  62                                 command = command_name)
  63
  64         if options.before or options.not_before:
  65                 policy.solver.extra_restrictions[root_iface] = [
  66                                 model.VersionRangeRestriction(model.parse_version(options.before),
  67                                                               model.parse_version(options.not_before))]
  68
  69         if options.os or options.cpu:
  70                 from zeroinstall.injector import arch
  71                 policy.target_arch = arch.get_architecture(options.os, options.cpu)
  72
  73         if options.offline:
  74                 policy.network_use = model.network_offline
  75
  76         # Note that need_download() triggers a solve
  77         if options.refresh or options.gui:
  78                 # We could run immediately, but the user asked us not to
  79                 can_run_immediately = False
  80         else:
  81                 if select_only:
  82                         # --select-only: we only care that we've made a selection, not that we've cached the implementations
  83                         policy.need_download()
  84                         can_run_immediately = policy.ready
  85                 else:
  86                         can_run_immediately = not policy.need_download()
  87
  88                 stale_feeds = [feed for feed in policy.solver.feeds_used if
  89                                 not feed.startswith('distribution:') and        # Ignore (memory-only) PackageKit feeds
  90                                 policy.is_stale(iface_cache.get_feed(feed))]
  91
  92                 if download_only and stale_feeds:
  93                         can_run_immediately = False
  94
  95         if can_run_immediately:
  96                 if stale_feeds:
  97                         if policy.network_use == model.network_offline:
  98                                 logging.debug(_("No doing background update because we are in off-line mode."))
  99                         else:
 100                                 # There are feeds we should update, but we can run without them.
 101                                 # Do the update in the background while the program is running.
 102                                 from zeroinstall.injector import background
 103                                 background.spawn_background_update(policy, options.verbose > 0)
 104                 return policy.solver.selections
 105
 106         # If the user didn't say whether to use the GUI, choose for them.
 107         if options.gui is None and os.environ.get('DISPLAY', None):
 108                 options.gui = True
 109                 # If we need to download anything, we might as well
 110                 # refresh all the feeds first.
 111                 options.refresh = True
 112                 logging.info(_("Switching to GUI mode... (use --console to disable)"))
 113
 114         if options.gui:
 115                 gui_args = []
 116                 if download_only:
 117                         # Just changes the button's label
 118                         gui_args.append('--download-only')
 119                 if options.refresh:
 120                         gui_args.append('--refresh')
 121                 if options.not_before:
 122                         gui_args.insert(0, options.not_before)
 123                         gui_args.insert(0, '--not-before')
 124                 if options.before:
 125                         gui_args.insert(0, options.before)
 126                         gui_args.insert(0, '--before')
 127                 if options.source:
 128                         gui_args.insert(0, '--source')
 129                 if options.message:
 130                         gui_args.insert(0, options.message)
 131                         gui_args.insert(0, '--message')
 132                 if options.verbose:
 133                         gui_args.insert(0, '--verbose')
 134                         if options.verbose > 1:
 135                                 gui_args.insert(0, '--verbose')
 136                 if options.cpu:
 137                         gui_args.insert(0, options.cpu)
 138                         gui_args.insert(0, '--cpu')
 139                 if options.os:
 140                         gui_args.insert(0, options.os)
 141                         gui_args.insert(0, '--os')
 142                 if options.with_store:
 143                         for x in options.with_store:
 144                                 gui_args += ['--with-store', x]
 145                 if select_only:
 146                         gui_args.append('--select-only')
 147                 if command_name is not None:
 148                         gui_args.append('--command')
 149                         gui_args.append(command_name)
 150
 151                 from zeroinstall import helpers
 152                 sels = helpers.get_selections_gui(iface_uri, gui_args, test_callback)
 153
 154                 if not sels:
 155                         return None             # Aborted
 156         else:
 157                 # Note: --download-only also makes us stop and download stale feeds first.
 158                 downloaded = policy.solve_and_download_impls(refresh = options.refresh or download_only or False,
 159                                                              select_only = select_only)
 160                 if downloaded:
 161                         policy.handler.wait_for_blocker(downloaded)
 162                 sels = selections.Selections(policy)
 163
 164         return sels
 165
 166 def handle(options, args):
 167         if len(args) != 1:
 168                 raise UsageError()
 169         iface_uri = model.canonical_iface_uri(args[0])
 170
 171         sels = get_selections(options, iface_uri,
 172                                 select_only = True, download_only = False, test_callback = None)
 173         if not sels:
 174                 sys.exit(1)     # Aborted by user
 175
 176         if options.xml:
 177                 show_xml(sels)
 178         else:
 179                 show_human(sels)
 180
 181 def show_xml(sels):
 182         doc = sels.toDOM()
 183         doc.writexml(sys.stdout)
 184         sys.stdout.write('\n')
 185
 186 def show_human(sels):
 187         from zeroinstall import zerostore
 188         done = set()    # detect cycles
 189         def print_node(uri, command, indent):
 190                 if uri in done: return
 191                 done.add(uri)
 192                 impl = sels.selections.get(uri, None)
 193                 print indent + "- URI:", uri
 194                 if impl:
 195                         print indent + "  Version:", impl.version
 196                         try:
 197                                 if impl.id.startswith('package:'):
 198                                         path = "(" + impl.id + ")"
 199                                 else:
 200                                         path = impl.local_path or iface_cache.stores.lookup_any(impl.digests)
 201                         except zerostore.NotStored:
 202                                 path = "(not cached)"
 203                         print indent + "  Path:", path
 204                         indent += "  "
 205                         deps = impl.dependencies
 206                         if command is not None:
 207                                 deps += sels.commands[command].requires
 208                         for child in deps:
 209                                 if isinstance(child, model.InterfaceDependency):
 210                                         if child.qdom.name == 'runner':
 211                                                 child_command = command + 1
 212                                         else:
 213                                                 child_command = None
 214                                         print_node(child.interface, child_command, indent)
 215                 else:
 216                         print indent + "  No selected version"
 217
 218
 219         if sels.commands:
 220                 print_node(sels.interface, 0, "")
 221         else:
 222                 print_node(sels.interface, None, "")