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 __future__ import print_function
   9
  10 import os, sys
  11 import logging
  12
  13 from zeroinstall import _
  14 from zeroinstall.cmd import UsageError
  15 from zeroinstall.injector import model, selections, requirements
  16 from zeroinstall.injector.driver import Driver
  17 from zeroinstall.support import tasks
  18
  19 syntax = "URI"
  20
  21 def add_generic_select_options(parser):
  22         """All options for selecting."""
  23         parser.add_option("", "--before", help=_("choose a version before this"), metavar='VERSION')
  24         parser.add_option("", "--command", help=_("command to select"), metavar='COMMAND')
  25         parser.add_option("", "--cpu", help=_("target CPU type"), metavar='CPU')
  26         parser.add_option("", "--message", help=_("message to display when interacting with user"))
  27         parser.add_option("", "--not-before", help=_("minimum version to choose"), metavar='VERSION')
  28         parser.add_option("-o", "--offline", help=_("try to avoid using the network"), action='store_true')
  29         parser.add_option("", "--os", help=_("target operation system type"), metavar='OS')
  30         parser.add_option("-r", "--refresh", help=_("refresh all used interfaces"), action='store_true')
  31         parser.add_option("-s", "--source", help=_("select source code"), action='store_true')
  32
  33 def add_options(parser):
  34         """Options for 'select' and 'download' (but not 'run')"""
  35         add_generic_select_options(parser)
  36         parser.add_option("", "--xml", help=_("write selected versions as XML"), action='store_true')
  37
  38 def get_selections(config, options, iface_uri, select_only, download_only, test_callback):
  39         """Get selections for iface_uri, according to the options passed.
  40         Will switch to GUI mode if necessary.
  41         @param options: options from OptionParser
  42         @param iface_uri: canonical URI of the interface
  43         @param select_only: return immediately even if the selected versions aren't cached
  44         @param download_only: wait for stale feeds, and display GUI button as Download, not Run
  45         @return: the selected versions, or None if the user cancels
  46         @rtype: L{selections.Selections} | None
  47         """
  48         if options.offline:
  49                 config.network_use = model.network_offline
  50
  51         iface_cache = config.iface_cache
  52
  53         # Try to load it as a feed. If it is a feed, it'll get cached. If not, it's a
  54         # selections document and we return immediately.
  55         maybe_selections = iface_cache.get_feed(iface_uri, selections_ok = True)
  56         if isinstance(maybe_selections, selections.Selections):
  57                 if not select_only:
  58                         blocker = maybe_selections.download_missing(config)
  59                         if blocker:
  60                                 logging.info(_("Waiting for selected implementations to be downloaded..."))
  61                                 tasks.wait_for_blocker(blocker)
  62                 return maybe_selections
  63
  64         r = requirements.Requirements(iface_uri)
  65         r.parse_options(options)
  66
  67         return get_selections_for(r, config, options, select_only, download_only, test_callback)
  68
  69 def get_selections_for(requirements, config, options, select_only, download_only, test_callback):
  70         """Get selections for given requirements.
  71         @since: 1.9"""
  72         if options.offline:
  73                 config.network_use = model.network_offline
  74
  75         iface_cache = config.iface_cache
  76
  77         driver = Driver(config = config, requirements = requirements)
  78
  79         # Note that need_download() triggers a solve
  80         if options.refresh or options.gui:
  81                 # We could run immediately, but the user asked us not to
  82                 can_run_immediately = False
  83         else:
  84                 if select_only:
  85                         # --select-only: we only care that we've made a selection, not that we've cached the implementations
  86                         driver.need_download()
  87                         can_run_immediately = driver.solver.ready
  88                 else:
  89                         can_run_immediately = not driver.need_download()
  90
  91                 stale_feeds = [feed for feed in driver.solver.feeds_used if
  92                                 not feed.startswith('distribution:') and        # Ignore (memory-only) PackageKit feeds
  93                                 iface_cache.is_stale(feed, config.freshness)]
  94
  95                 if download_only and stale_feeds:
  96                         can_run_immediately = False
  97
  98         if can_run_immediately:
  99                 if stale_feeds:
 100                         if config.network_use == model.network_offline:
 101                                 logging.debug(_("No doing background update because we are in off-line mode."))
 102                         else:
 103                                 # There are feeds we should update, but we can run without them.
 104                                 # Do the update in the background while the program is running.
 105                                 from zeroinstall.injector import background
 106                                 background.spawn_background_update(driver, options.verbose)
 107                 return driver.solver.selections
 108
 109         # If the user didn't say whether to use the GUI, choose for them.
 110         if options.gui is None and os.environ.get('DISPLAY', None):
 111                 options.gui = True
 112                 # If we need to download anything, we might as well
 113                 # refresh all the feeds first.
 114                 options.refresh = True
 115                 logging.info(_("Switching to GUI mode... (use --console to disable)"))
 116
 117         if options.gui:
 118                 gui_args = driver.requirements.get_as_options()
 119                 if download_only:
 120                         # Just changes the button's label
 121                         gui_args.append('--download-only')
 122                 if options.refresh:
 123                         gui_args.append('--refresh')
 124                 if options.verbose:
 125                         gui_args.insert(0, '--verbose')
 126                         if options.verbose > 1:
 127                                 gui_args.insert(0, '--verbose')
 128                 if options.with_store:
 129                         for x in options.with_store:
 130                                 gui_args += ['--with-store', x]
 131                 if select_only:
 132                         gui_args.append('--select-only')
 133
 134                 from zeroinstall import helpers
 135                 sels = helpers.get_selections_gui(requirements.interface_uri, gui_args, test_callback)
 136
 137                 if not sels:
 138                         return None             # Aborted
 139         else:
 140                 # Note: --download-only also makes us stop and download stale feeds first.
 141                 downloaded = driver.solve_and_download_impls(refresh = options.refresh or download_only or False,
 142                                                              select_only = select_only)
 143                 if downloaded:
 144                         tasks.wait_for_blocker(downloaded)
 145                 sels = driver.solver.selections
 146
 147         return sels
 148
 149 def handle(config, options, args):
 150         if len(args) != 1:
 151                 raise UsageError()
 152
 153         app = config.app_mgr.lookup_app(args[0], missing_ok = True)
 154         if app is not None:
 155                 sels = app.get_selections()
 156
 157                 r = app.get_requirements()
 158                 do_select = r.parse_update_options(options)
 159                 iface_uri = sels.interface
 160         else:
 161                 iface_uri = model.canonical_iface_uri(args[0])
 162                 do_select = True
 163
 164         if do_select or options.gui:
 165                 sels = get_selections(config, options, iface_uri,
 166                                         select_only = True, download_only = False, test_callback = None)
 167                 if not sels:
 168                         sys.exit(1)     # Aborted by user
 169
 170         if options.xml:
 171                 show_xml(sels)
 172         else:
 173                 show_human(sels, config.stores)
 174                 if app is not None and do_select:
 175                         print(_("(use '0install update' to save the new parameters)"))
 176
 177 def show_xml(sels):
 178         doc = sels.toDOM()
 179         doc.writexml(sys.stdout)
 180         sys.stdout.write('\n')
 181
 182 def show_human(sels, stores):
 183         done = set()    # detect cycles
 184         def print_node(uri, commands, indent):
 185                 if uri in done: return
 186                 done.add(uri)
 187                 impl = sels.selections.get(uri, None)
 188                 print(indent + "- URI:", uri)
 189                 if impl:
 190                         print(indent + "  Version:", impl.version)
 191                         #print indent + "  Command:", command
 192                         if impl.id.startswith('package:'):
 193                                 path = "(" + impl.id + ")"
 194                         else:
 195                                 path = impl.get_path(stores, missing_ok = True) or _("(not cached)")
 196                         print(indent + "  Path:", path)
 197                         indent += "  "
 198
 199                         deps = impl.dependencies
 200                         for c in commands:
 201                                 deps += impl.get_command(c).requires
 202                         for child in deps:
 203                                 print_node(child.interface, child.get_required_commands(), indent)
 204                 else:
 205                         print(indent + "  No selected version")
 206
 207
 208         if sels.command:
 209                 print_node(sels.interface, [sels.command], "")
 210         else:
 211                 print_node(sels.interface, [], "")