zeroinstall/injector/packagekit.py

   1 """
   2 PackageKit integration.
   3 """
   4
   5 # Copyright (C) 2010, Aleksey Lim
   6 # See the README file for details, or visit http://0install.net.
   7
   8 import os, sys
   9 import locale
  10 import logging
  11 from zeroinstall import _, SafeException
  12
  13 from zeroinstall.support import tasks
  14 from zeroinstall.injector import download, model
  15
  16 _logger_pk = logging.getLogger('packagekit')
  17
  18 try:
  19         import dbus
  20         import dbus.mainloop.glib
  21         dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
  22 except Exception as ex:
  23         _logger_pk.info("D-BUS not available: %s", ex)
  24         dbus = None
  25
  26 MAX_PACKAGE_KIT_TRANSACTION_SIZE = 100
  27
  28 class PackageKit(object):
  29         def __init__(self):
  30                 self._pk = False
  31
  32                 self._candidates = {}   # { package_name : [ (version, arch, size) ] | Blocker }
  33
  34                 # PackageKit is really slow at handling separate queries, so we use this to
  35                 # batch them up.
  36                 self._next_batch = set()
  37
  38         @property
  39         def available(self):
  40                 return self.pk is not None
  41
  42         @property
  43         def pk(self):
  44                 if self._pk is False:
  45                         try:
  46                                 self._pk = dbus.Interface(dbus.SystemBus().get_object(
  47                                                         'org.freedesktop.PackageKit',
  48                                                         '/org/freedesktop/PackageKit', False),
  49                                                 'org.freedesktop.PackageKit')
  50                                 _logger_pk.info(_('PackageKit dbus service found'))
  51                         except Exception as ex:
  52                                 _logger_pk.info(_('PackageKit dbus service not found: %s'), ex)
  53                                 self._pk = None
  54                 return self._pk
  55
  56         def get_candidates(self, package_name, factory, prefix):
  57                 """Add any cached candidates.
  58                 The candidates are those discovered by a previous call to L{fetch_candidates}.
  59                 @param package_name: the distribution's name for the package
  60                 @param factory: a function to add a new implementation to the feed
  61                 @param prefix: the prefix for the implementation's ID
  62                 """
  63                 candidates = self._candidates.get(package_name, None)
  64                 if candidates is None:
  65                         return
  66
  67                 if isinstance(candidates, tasks.Blocker):
  68                         return          # Fetch still in progress
  69
  70                 for candidate in candidates:
  71                         impl_name = '%s:%s:%s:%s' % (prefix, package_name, candidate['version'], candidate['arch'])
  72
  73                         impl = factory(impl_name, only_if_missing = True, installed = candidate['installed'])
  74                         if impl is None:
  75                                 # (checking this way because the cached candidate['installed'] may be stale)
  76                                 return          # Already installed
  77
  78                         impl.version = model.parse_version(candidate['version'])
  79                         if candidate['arch'] != '*':
  80                                 impl.machine = candidate['arch']
  81
  82                         def install(handler):
  83                                 packagekit_id = candidate['packagekit_id']
  84                                 dl = PackageKitDownload('packagekit:' + packagekit_id, hint = impl, pk = self.pk, packagekit_id = packagekit_id, expected_size = candidate['size'])
  85                                 handler.monitor_download(dl)
  86                                 return dl.downloaded
  87                         impl.download_sources.append(model.DistributionSource(package_name, candidate['size'], install))
  88
  89         @tasks.async
  90         def fetch_candidates(self, package_names):
  91                 assert self.pk
  92
  93                 # Batch requests up
  94                 self._next_batch |= set(package_names)
  95                 yield
  96                 package_names = self._next_batch
  97                 self._next_batch = set()
  98                 # The first fetch_candidates instance will now have all the packages
  99                 # For the others, package_names will now be empty
 100
 101                 known = [self._candidates[p] for p in package_names if p in self._candidates]
 102                 # (use set because a single task may be checking multiple packages and we need
 103                 # to avoid duplicates).
 104                 in_progress = list(set([b for b in known if isinstance(b, tasks.Blocker)]))
 105                 _logger_pk.debug('Already downloading: %s', in_progress)
 106
 107                 # Filter out the ones we've already fetched
 108                 package_names = [p for p in package_names if p not in self._candidates]
 109
 110                 def do_batch(package_names):
 111                         #_logger_pk.info("sending %d packages in batch", len(package_names))
 112                         versions = {}
 113
 114                         blocker = None
 115
 116                         def error_cb(sender):
 117                                 # Note: probably just means the package wasn't found
 118                                 _logger_pk.info(_('Transaction failed: %s(%s)'), sender.error_code, sender.error_details)
 119                                 blocker.trigger()
 120
 121                         def details_cb(sender):
 122                                 for packagekit_id, info in versions.items():
 123                                         if packagekit_id in sender.details:
 124                                                 info.update(sender.details[packagekit_id])
 125                                                 info['packagekit_id'] = packagekit_id
 126                                                 if (info['name'] not in self._candidates or
 127                                                     isinstance(self._candidates[info['name']], tasks.Blocker)):
 128                                                         self._candidates[info['name']] = [info]
 129                                                 else:
 130                                                         self._candidates[info['name']].append(info)
 131                                         else:
 132                                                 _logger_pk.info(_('Empty details for %s'), packagekit_id)
 133                                 blocker.trigger()
 134
 135                         def resolve_cb(sender):
 136                                 if sender.package:
 137                                         for packagekit_id, info in sender.package.iteritems():
 138                                                 parts = packagekit_id.split(';', 3)
 139                                                 if ':' in parts[3]:
 140                                                         parts[3] = parts[3].split(':', 1)[0]
 141                                                         packagekit_id = ';'.join(parts)
 142                                                 versions[packagekit_id] = info
 143                                         tran = _PackageKitTransaction(self.pk, details_cb, error_cb)
 144                                         tran.proxy.GetDetails(versions.keys())
 145                                 else:
 146                                         _logger_pk.info(_('Empty resolve for %s'), package_names)
 147                                         blocker.trigger()
 148
 149                         # Send queries
 150                         blocker = tasks.Blocker('PackageKit %s' % package_names)
 151                         for package in package_names:
 152                                 self._candidates[package] = blocker
 153
 154                         try:
 155                                 _logger_pk.debug(_('Ask for %s'), package_names)
 156                                 tran = _PackageKitTransaction(self.pk, resolve_cb, error_cb)
 157                                 tran.proxy.Resolve('none', package_names)
 158
 159                                 in_progress.append(blocker)
 160                         except:
 161                                 __, ex, tb = sys.exc_info()
 162                                 blocker.trigger((ex, tb))
 163                                 raise
 164
 165                 # Now we've collected all the requests together, split them up into chunks
 166                 # that PackageKit can handle ( < 100 per batch )
 167                 #_logger_pk.info("sending %d packages", len(package_names))
 168                 while package_names:
 169                         next_batch = package_names[:MAX_PACKAGE_KIT_TRANSACTION_SIZE]
 170                         package_names = package_names[MAX_PACKAGE_KIT_TRANSACTION_SIZE:]
 171                         do_batch(next_batch)
 172
 173                 while in_progress:
 174                         try:
 175                                 yield in_progress
 176                         except:
 177                                 pass
 178                         in_progress = [b for b in in_progress if not b.happened]
 179
 180 class PackageKitDownload:
 181         def __init__(self, url, hint, pk, packagekit_id, expected_size):
 182                 self.url = url
 183                 self.status = download.download_fetching
 184                 self.hint = hint
 185                 self.aborted_by_user = False
 186
 187                 self.downloaded = None
 188
 189                 self.expected_size = expected_size
 190
 191                 self.packagekit_id = packagekit_id
 192                 self._impl = hint
 193                 self._transaction = None
 194                 self.pk = pk
 195
 196                 def error_cb(sender):
 197                         self.status = download.download_failed
 198                         ex = SafeException('PackageKit install failed: %s' % (sender.error_details or sender.error_code))
 199                         self.downloaded.trigger(exception = (ex, None))
 200
 201                 def installed_cb(sender):
 202                         self._impl.installed = True;
 203                         self.status = download.download_complete
 204                         self.downloaded.trigger()
 205
 206                 def install_packages():
 207                         package_name = self.packagekit_id
 208                         self._transaction = _PackageKitTransaction(self.pk, installed_cb, error_cb)
 209                         self._transaction.compat_call([
 210                                         ('InstallPackages', [package_name]),
 211                                         ('InstallPackages', False, [package_name]),
 212                                         ])
 213
 214                 _auth_wrapper(install_packages)
 215
 216                 self.downloaded = tasks.Blocker('PackageKit install %s' % self.packagekit_id)
 217
 218         def abort(self):
 219                 _logger_pk.debug(_('Cancel transaction'))
 220                 self.aborted_by_user = True
 221                 self._transaction.proxy.Cancel()
 222                 self.status = download.download_failed
 223                 self.downloaded.trigger()
 224
 225         def get_current_fraction(self):
 226                 if self._transaction is None:
 227                         return None
 228                 percentage = self._transaction.getPercentage()
 229                 if percentage > 100:
 230                         return None
 231                 else:
 232                         return float(percentage) / 100.
 233
 234         def get_bytes_downloaded_so_far(self):
 235                 fraction = self.get_current_fraction()
 236                 if fraction is None:
 237                         return 0
 238                 else:
 239                         if self.expected_size is None:
 240                                 return 0
 241                         return int(self.expected_size * fraction)
 242
 243 def _auth_wrapper(method, *args):
 244         try:
 245                 return method(*args)
 246         except dbus.exceptions.DBusException as e:
 247                 if e.get_dbus_name() != \
 248                                 'org.freedesktop.PackageKit.Transaction.RefusedByPolicy':
 249                         raise
 250
 251                 iface, auth = e.get_dbus_message().split()
 252                 if not auth.startswith('auth_'):
 253                         raise
 254
 255                 _logger_pk.debug(_('Authentication required for %s'), auth)
 256
 257                 pk_auth = dbus.SessionBus().get_object(
 258                                 'org.freedesktop.PolicyKit.AuthenticationAgent', '/',
 259                                 'org.gnome.PolicyKit.AuthorizationManager.SingleInstance')
 260
 261                 if not pk_auth.ObtainAuthorization(iface, dbus.UInt32(0),
 262                                 dbus.UInt32(os.getpid()), timeout=300):
 263                         raise
 264
 265                 return method(*args)
 266
 267 class _PackageKitTransaction(object):
 268         def __init__(self, pk, finished_cb=None, error_cb=None):
 269                 self._finished_cb = finished_cb
 270                 self._error_cb = error_cb
 271                 self.error_code = None
 272                 self.error_details = None
 273                 self.package = {}
 274                 self.details = {}
 275                 self.files = {}
 276
 277                 self.object = dbus.SystemBus().get_object(
 278                                 'org.freedesktop.PackageKit', pk.GetTid(), False)
 279                 self.proxy = dbus.Interface(self.object,
 280                                 'org.freedesktop.PackageKit.Transaction')
 281                 self._props = dbus.Interface(self.object, dbus.PROPERTIES_IFACE)
 282
 283                 self._signals = []
 284                 for signal, cb in [('Finished', self.__finished_cb),
 285                                    ('ErrorCode', self.__error_code_cb),
 286                                    ('StatusChanged', self.__status_changed_cb),
 287                                    ('Package', self.__package_cb),
 288                                    ('Details', self.__details_cb),
 289                                    ('Files', self.__files_cb)]:
 290                         self._signals.append(self.proxy.connect_to_signal(signal, cb))
 291
 292                 defaultlocale = locale.getdefaultlocale()[0]
 293                 if defaultlocale is not None:
 294                         self.compat_call([
 295                                         ('SetLocale', defaultlocale),
 296                                         ('SetHints', ['locale=%s' % defaultlocale]),
 297                                         ])
 298
 299         def getPercentage(self):
 300                 result = self.get_prop('Percentage')
 301                 if result is None:
 302                         result, __, __, __ = self.proxy.GetProgress()
 303                 return result
 304
 305         def get_prop(self, prop, default = None):
 306                 try:
 307                         return self._props.Get('org.freedesktop.PackageKit.Transaction', prop)
 308                 except:
 309                         return default
 310
 311         def compat_call(self, calls):
 312                 for call in calls:
 313                         method = call[0]
 314                         args = call[1:]
 315                         try:
 316                                 dbus_method = self.proxy.get_dbus_method(method)
 317                                 return dbus_method(*args)
 318                         except dbus.exceptions.DBusException as e:
 319                                 if e.get_dbus_name() != \
 320                                                 'org.freedesktop.DBus.Error.UnknownMethod':
 321                                         raise
 322                 raise Exception('Cannot call %r DBus method' % calls)
 323
 324         def __finished_cb(self, exit, runtime):
 325                 _logger_pk.debug(_('Transaction finished: %s'), exit)
 326
 327                 for i in self._signals:
 328                         i.remove()
 329
 330                 if self.error_code is not None:
 331                         self._error_cb(self)
 332                 else:
 333                         self._finished_cb(self)
 334
 335         def __error_code_cb(self, code, details):
 336                 _logger_pk.info(_('Transaction failed: %s(%s)'), details, code)
 337                 self.error_code = code
 338                 self.error_details = details
 339
 340         def __package_cb(self, status, id, summary):
 341                 from zeroinstall.injector import distro
 342
 343                 package_name, version, arch, repo_ = id.split(';')
 344                 clean_version = distro.try_cleanup_distro_version(version)
 345                 if not clean_version:
 346                         _logger_pk.warn(_("Can't parse distribution version '%(version)s' for package '%(package)s'"), {'version': version, 'package': package_name})
 347                 clean_arch = distro.canonical_machine(arch)
 348                 package = {'version': clean_version,
 349                            'name': package_name,
 350                            'arch': clean_arch,
 351                            'installed': (status == 'installed')}
 352                 _logger_pk.debug(_('Package: %s %r'), id, package)
 353                 self.package[str(id)] = package
 354
 355         def __details_cb(self, id, licence, group, detail, url, size):
 356                 details = {'licence': str(licence),
 357                                    'group': str(group),
 358                                    'detail': str(detail),
 359                                    'url': str(url),
 360                                    'size': int(size)}
 361                 _logger_pk.debug(_('Details: %s %r'), id, details)
 362                 self.details[id] = details
 363
 364         def __files_cb(self, id, files):
 365                 self.files[id] = files.split(';')
 366
 367         def __status_changed_cb(self, status):
 368                 pass