1 """In-memory representation of interfaces and other data structures.
3 The objects in this module are used to build a representation of an XML interface
6 @see: L{reader} constructs these data-structures
7 @see: U{http://0install.net/interface-spec.html} description of the domain model
9 @var defaults: Default values for the 'default' attribute for <environment> bindings of
13 # Copyright (C) 2009, Thomas Leonard
14 # See the README file for details, or visit http://0install.net.
16 from zeroinstall
import _
18 from logging
import info
, debug
, warn
19 from zeroinstall
import SafeException
, version
20 from zeroinstall
.injector
.namespaces
import XMLNS_IFACE
21 from zeroinstall
.injector
import qdom
23 # Element names for bindings in feed files
24 binding_names
= frozenset(['environment', 'overlay', 'executable-in-path', 'executable-in-var'])
26 network_offline
= 'off-line'
27 network_minimal
= 'minimal'
29 network_levels
= (network_offline
, network_minimal
, network_full
)
31 stability_levels
= {} # Name -> Stability
34 'PATH': '/bin:/usr/bin',
35 'XDG_CONFIG_DIRS': '/etc/xdg',
36 'XDG_DATA_DIRS': '/usr/local/share:/usr/share',
39 class InvalidInterface(SafeException
):
40 """Raised when parsing an invalid feed."""
43 def __init__(self
, message
, ex
= None):
46 message
+= "\n\n(exact error: %s)" % ex
48 # Some Python messages have type str but contain UTF-8 sequences.
49 # (e.g. IOException). Adding these to a Unicode 'message' (e.g.
50 # after gettext translation) will cause an error.
52 decoder
= codecs
.lookup('utf-8')
53 decex
= decoder
.decode(str(ex
), errors
= 'replace')[0]
54 message
+= "\n\n(exact error: %s)" % decex
56 SafeException
.__init
__(self
, message
)
58 def __unicode__(self
):
59 if hasattr(SafeException
, '__unicode__'):
62 return _('%s [%s]') % (SafeException
.__unicode
__(self
), self
.feed_url
)
63 return SafeException
.__unicode
__(self
)
65 return unicode(SafeException
.__str
__(self
))
67 def _split_arch(arch
):
68 """Split an arch into an (os, machine) tuple. Either or both parts may be None."""
72 raise SafeException(_("Malformed arch '%s'") % arch
)
74 osys
, machine
= arch
.split('-', 1)
75 if osys
== '*': osys
= None
76 if machine
== '*': machine
= None
79 def _join_arch(osys
, machine
):
80 if osys
== machine
== None: return None
81 return "%s-%s" % (osys
or '*', machine
or '*')
83 def _best_language_match(options
):
84 (language
, encoding
) = locale
.getlocale()
87 # xml:lang uses '-', while LANG uses '_'
88 language
= language
.replace('_', '-')
92 return (options
.get(language
, None) or # Exact match (language+region)
93 options
.get(language
.split('-', 1)[0], None) or # Matching language
94 options
.get('en', None)) # English
96 class Stability(object):
97 """A stability rating. Each implementation has an upstream stability rating and,
98 optionally, a user-set rating."""
99 __slots__
= ['level', 'name', 'description']
100 def __init__(self
, level
, name
, description
):
103 self
.description
= description
104 assert name
not in stability_levels
105 stability_levels
[name
] = self
107 def __cmp__(self
, other
):
108 return cmp(self
.level
, other
.level
)
114 return _("<Stability: %s>") % self
.description
116 def process_binding(e
):
118 if e
.name
== 'environment':
120 None: EnvironmentBinding
.PREPEND
,
121 'prepend': EnvironmentBinding
.PREPEND
,
122 'append': EnvironmentBinding
.APPEND
,
123 'replace': EnvironmentBinding
.REPLACE
,
124 }[e
.getAttribute('mode')]
126 binding
= EnvironmentBinding(e
.getAttribute('name'),
127 insert
= e
.getAttribute('insert'),
128 default
= e
.getAttribute('default'),
129 value
= e
.getAttribute('value'),
131 separator
= e
.getAttribute('separator'))
132 if not binding
.name
: raise InvalidInterface(_("Missing 'name' in binding"))
133 if binding
.insert
is None and binding
.value
is None:
134 raise InvalidInterface(_("Missing 'insert' or 'value' in binding"))
135 if binding
.insert
is not None and binding
.value
is not None:
136 raise InvalidInterface(_("Binding contains both 'insert' and 'value'"))
138 elif e
.name
== 'executable-in-path':
139 return ExecutableBinding(e
, in_path
= True)
140 elif e
.name
== 'executable-in-var':
141 return ExecutableBinding(e
, in_path
= False)
142 elif e
.name
== 'overlay':
143 return OverlayBinding(e
.getAttribute('src'), e
.getAttribute('mount-point'))
145 raise Exception(_("Unknown binding type '%s'") % e
.name
)
147 def process_depends(item
, local_feed_dir
):
149 # Note: also called from selections
151 dep_iface
= item
.getAttribute('interface')
153 raise InvalidInterface(_("Missing 'interface' on <%s>") % item
.name
)
154 if dep_iface
.startswith('./'):
156 dep_iface
= os
.path
.abspath(os
.path
.join(local_feed_dir
, dep_iface
))
157 # (updates the element too, in case we write it out again)
158 attrs
['interface'] = dep_iface
160 raise InvalidInterface(_('Relative interface URI "%s" in non-local feed') % dep_iface
)
161 dependency
= InterfaceDependency(dep_iface
, element
= item
)
163 for e
in item
.childNodes
:
164 if e
.uri
!= XMLNS_IFACE
: continue
165 if e
.name
in binding_names
:
166 dependency
.bindings
.append(process_binding(e
))
167 elif e
.name
== 'version':
168 dependency
.restrictions
.append(
169 VersionRangeRestriction(not_before
= parse_version(e
.getAttribute('not-before')),
170 before
= parse_version(e
.getAttribute('before'))))
173 def N_(message
): return message
175 insecure
= Stability(0, N_('insecure'), _('This is a security risk'))
176 buggy
= Stability(5, N_('buggy'), _('Known to have serious bugs'))
177 developer
= Stability(10, N_('developer'), _('Work-in-progress - bugs likely'))
178 testing
= Stability(20, N_('testing'), _('Stability unknown - please test!'))
179 stable
= Stability(30, N_('stable'), _('Tested - no serious problems found'))
180 packaged
= Stability(35, N_('packaged'), _('Supplied by the local package manager'))
181 preferred
= Stability(40, N_('preferred'), _('Best of all - must be set manually'))
185 class Restriction(object):
186 """A Restriction limits the allowed implementations of an Interface."""
189 def meets_restriction(self
, impl
):
190 """Called by the L{solver.Solver} to check whether a particular implementation is acceptable.
191 @return: False if this implementation is not a possibility
194 raise NotImplementedError(_("Abstract"))
196 class VersionRestriction(Restriction
):
197 """Only select implementations with a particular version number.
200 def __init__(self
, version
):
201 """@param version: the required version number
202 @see: L{parse_version}; use this to pre-process the version number
204 self
.version
= version
206 def meets_restriction(self
, impl
):
207 return impl
.version
== self
.version
210 return _("(restriction: version = %s)") % format_version(self
.version
)
212 class VersionRangeRestriction(Restriction
):
213 """Only versions within the given range are acceptable"""
214 __slots__
= ['before', 'not_before']
216 def __init__(self
, before
, not_before
):
217 """@param before: chosen versions must be earlier than this
218 @param not_before: versions must be at least this high
219 @see: L{parse_version}; use this to pre-process the versions
222 self
.not_before
= not_before
224 def meets_restriction(self
, impl
):
225 if self
.not_before
and impl
.version
< self
.not_before
:
227 if self
.before
and impl
.version
>= self
.before
:
232 if self
.not_before
is not None or self
.before
is not None:
234 if self
.not_before
is not None:
235 range += format_version(self
.not_before
) + ' <= '
237 if self
.before
is not None:
238 range += ' < ' + format_version(self
.before
)
241 return _("(restriction: %s)") % range
243 class Binding(object):
244 """Information about how the choice of a Dependency is made known
245 to the application being run."""
249 """"Returns the name of the specific command needed by this binding, if any.
253 class EnvironmentBinding(Binding
):
254 """Indicate the chosen implementation using an environment variable."""
255 __slots__
= ['name', 'insert', 'default', 'mode', 'value']
261 def __init__(self
, name
, insert
, default
= None, mode
= PREPEND
, value
=None, separator
=None):
263 mode argument added in version 0.28
264 value argument added in version 0.52
268 self
.default
= default
271 if separator
is None:
272 self
.separator
= os
.pathsep
274 self
.separator
= separator
278 return _("<environ %(name)s %(mode)s %(insert)s %(value)s>") % {'name': self
.name
,'mode': self
.mode
, 'insert': self
.insert
, 'value': self
.value
}
282 def get_value(self
, path
, old_value
):
283 """Calculate the new value of the environment variable after applying this binding.
284 @param path: the path to the selected implementation
285 @param old_value: the current value of the environment variable
286 @return: the new value for the environment variable"""
288 if self
.insert
is not None:
289 extra
= os
.path
.join(path
, self
.insert
)
291 assert self
.value
is not None
294 if self
.mode
== EnvironmentBinding
.REPLACE
:
297 if old_value
is None:
298 old_value
= self
.default
or defaults
.get(self
.name
, None)
299 if old_value
is None:
301 if self
.mode
== EnvironmentBinding
.PREPEND
:
302 return extra
+ self
.separator
+ old_value
304 return old_value
+ self
.separator
+ extra
306 def _toxml(self
, doc
, prefixes
):
307 """Create a DOM element for this binding.
308 @param doc: document to use to create the element
309 @return: the new element
311 env_elem
= doc
.createElementNS(XMLNS_IFACE
, 'environment')
312 env_elem
.setAttributeNS(None, 'name', self
.name
)
313 if self
.mode
is not None:
314 env_elem
.setAttributeNS(None, 'mode', self
.mode
)
315 if self
.insert
is not None:
316 env_elem
.setAttributeNS(None, 'insert', self
.insert
)
318 env_elem
.setAttributeNS(None, 'value', self
.value
)
320 env_elem
.setAttributeNS(None, 'default', self
.default
)
322 env_elem
.setAttributeNS(None, 'separator', self
.separator
)
325 class ExecutableBinding(Binding
):
326 """Make the chosen command available in $PATH.
327 @ivar in_path: True to add the named command to $PATH, False to store in named variable
332 def __init__(self
, qdom
, in_path
):
334 self
.in_path
= in_path
337 return str(self
.qdom
)
341 def _toxml(self
, doc
, prefixes
):
342 return self
.qdom
.toDOM(doc
, prefixes
)
346 return self
.qdom
.getAttribute('name')
350 return self
.qdom
.getAttribute("command") or 'run'
352 class OverlayBinding(Binding
):
353 """Make the chosen implementation available by overlaying it onto another part of the file-system.
354 This is to support legacy programs which use hard-coded paths."""
355 __slots__
= ['src', 'mount_point']
357 def __init__(self
, src
, mount_point
):
359 self
.mount_point
= mount_point
362 return _("<overlay %(src)s on %(mount_point)s>") % {'src': self
.src
or '.', 'mount_point': self
.mount_point
or '/'}
366 def _toxml(self
, doc
):
367 """Create a DOM element for this binding.
368 @param doc: document to use to create the element
369 @return: the new element
371 env_elem
= doc
.createElementNS(XMLNS_IFACE
, 'overlay')
372 if self
.src
is not None:
373 env_elem
.setAttributeNS(None, 'src', self
.src
)
374 if self
.mount_point
is not None:
375 env_elem
.setAttributeNS(None, 'mount-point', self
.mount_point
)
379 """An interface's feeds are other interfaces whose implementations can also be
380 used as implementations of this interface."""
381 __slots__
= ['uri', 'os', 'machine', 'user_override', 'langs']
382 def __init__(self
, uri
, arch
, user_override
, langs
= None):
384 # This indicates whether the feed comes from the user's overrides
385 # file. If true, writer.py will write it when saving.
386 self
.user_override
= user_override
387 self
.os
, self
.machine
= _split_arch(arch
)
391 return "<Feed from %s>" % self
.uri
394 arch
= property(lambda self
: _join_arch(self
.os
, self
.machine
))
396 class Dependency(object):
397 """A Dependency indicates that an Implementation requires some additional
398 code to function. This is an abstract base class.
399 @ivar qdom: the XML element for this Dependency (since 0launch 0.51)
400 @type qdom: L{qdom.Element}
401 @ivar metadata: any extra attributes from the XML element
402 @type metadata: {str: str}
406 Essential
= "essential"
407 Recommended
= "recommended"
409 def __init__(self
, element
):
410 assert isinstance(element
, qdom
.Element
), type(element
) # Use InterfaceDependency instead!
415 return self
.qdom
.attrs
418 def importance(self
):
419 return self
.qdom
.getAttribute("importance") or Dependency
.Essential
421 def get_required_commands(self
):
422 """Return a list of command names needed by this dependency"""
425 class InterfaceDependency(Dependency
):
426 """A Dependency on a Zero Install interface.
427 @ivar interface: the interface required by this dependency
429 @ivar restrictions: a list of constraints on acceptable implementations
430 @type restrictions: [L{Restriction}]
431 @ivar bindings: how to make the choice of implementation known
432 @type bindings: [L{Binding}]
435 __slots__
= ['interface', 'restrictions', 'bindings']
437 def __init__(self
, interface
, restrictions
= None, element
= None):
438 Dependency
.__init
__(self
, element
)
439 assert isinstance(interface
, (str, unicode))
441 self
.interface
= interface
442 if restrictions
is None:
443 self
.restrictions
= []
445 self
.restrictions
= restrictions
449 return _("<Dependency on %(interface)s; bindings: %(bindings)s%(restrictions)s>") % {'interface': self
.interface
, 'bindings': self
.bindings
, 'restrictions': self
.restrictions
}
451 def get_required_commands(self
):
452 """Return a list of command names needed by this dependency"""
453 if self
.qdom
.name
== 'runner':
454 commands
= [self
.qdom
.getAttribute('command') or 'run']
457 for b
in self
.bindings
:
465 if self
.qdom
.name
== 'runner':
466 return self
.qdom
.getAttribute('command') or 'run'
469 class RetrievalMethod(object):
470 """A RetrievalMethod provides a way to fetch an implementation."""
473 class DownloadSource(RetrievalMethod
):
474 """A DownloadSource provides a way to fetch an implementation."""
475 __slots__
= ['implementation', 'url', 'size', 'extract', 'start_offset', 'type']
477 def __init__(self
, implementation
, url
, size
, extract
, start_offset
= 0, type = None):
478 self
.implementation
= implementation
481 self
.extract
= extract
482 self
.start_offset
= start_offset
483 self
.type = type # MIME type - see unpack.py
485 class Recipe(RetrievalMethod
):
486 """Get an implementation by following a series of steps.
487 @ivar size: the combined download sizes from all the steps
489 @ivar steps: the sequence of steps which must be performed
490 @type steps: [L{RetrievalMethod}]"""
491 __slots__
= ['steps']
496 size
= property(lambda self
: sum([x
.size
for x
in self
.steps
]))
498 class DistributionSource(RetrievalMethod
):
499 """A package that is installed using the distribution's tools (including PackageKit).
500 @ivar install: a function to call to install this package
501 @type install: (L{handler.Handler}) -> L{tasks.Blocker}
502 @ivar package_id: the package name, in a form recognised by the distribution's tools
503 @type package_id: str
504 @ivar size: the download size in bytes
506 @ivar needs_confirmation: whether the user should be asked to confirm before calling install()
507 @type needs_confirmation: bool"""
509 __slots__
= ['package_id', 'size', 'install', 'needs_confirmation']
511 def __init__(self
, package_id
, size
, install
, needs_confirmation
= True):
512 RetrievalMethod
.__init
__(self
)
513 self
.package_id
= package_id
515 self
.install
= install
516 self
.needs_confirmation
= needs_confirmation
518 class Command(object):
519 """A Command is a way of running an Implementation as a program."""
521 __slots__
= ['qdom', '_depends', '_local_dir', '_runner']
523 def __init__(self
, qdom
, local_dir
):
524 """@param qdom: the <command> element
525 @param local_dir: the directory containing the feed (for relative dependencies), or None if not local
527 assert qdom
.name
== 'command', 'not <command>: %s' % qdom
529 self
._local
_dir
= local_dir
532 path
= property(lambda self
: self
.qdom
.attrs
.get("path", None))
534 def _toxml(self
, doc
, prefixes
):
535 return self
.qdom
.toDOM(doc
, prefixes
)
539 if self
._depends
is None:
542 for child
in self
.qdom
.childNodes
:
543 if child
.name
== 'requires':
544 dep
= process_depends(child
, self
._local
_dir
)
546 elif child
.name
== 'runner':
548 raise InvalidInterface(_("Multiple <runner>s in <command>!"))
549 dep
= process_depends(child
, self
._local
_dir
)
552 self
._depends
= depends
555 def get_runner(self
):
556 self
.requires
# (sets _runner)
560 return str(self
.qdom
)
562 class Implementation(object):
563 """An Implementation is a package which implements an Interface.
564 @ivar download_sources: list of methods of getting this implementation
565 @type download_sources: [L{RetrievalMethod}]
566 @ivar feed: the feed owning this implementation (since 0.32)
567 @type feed: [L{ZeroInstallFeed}]
568 @ivar bindings: how to tell this component where it itself is located (since 0.31)
569 @type bindings: [Binding]
570 @ivar upstream_stability: the stability reported by the packager
571 @type upstream_stability: [insecure | buggy | developer | testing | stable | packaged]
572 @ivar user_stability: the stability as set by the user
573 @type upstream_stability: [insecure | buggy | developer | testing | stable | packaged | preferred]
574 @ivar langs: natural languages supported by this package
576 @ivar requires: interfaces this package depends on
577 @type requires: [L{Dependency}]
578 @ivar commands: ways to execute as a program
579 @type commands: {str: Command}
580 @ivar metadata: extra metadata from the feed
581 @type metadata: {"[URI ]localName": str}
582 @ivar id: a unique identifier for this Implementation
583 @ivar version: a parsed version number
584 @ivar released: release date
585 @ivar local_path: the directory containing this local implementation, or None if it isn't local (id isn't a path)
586 @type local_path: str | None
587 @ivar requires_root_install: whether the user will need admin rights to use this
588 @type requires_root_install: bool
591 # Note: user_stability shouldn't really be here
593 __slots__
= ['upstream_stability', 'user_stability', 'langs',
594 'requires', 'metadata', 'download_sources', 'commands',
595 'id', 'feed', 'version', 'released', 'bindings', 'machine']
597 def __init__(self
, feed
, id):
601 self
.user_stability
= None
602 self
.upstream_stability
= None
603 self
.metadata
= {} # [URI + " "] + localName -> value
607 self
.download_sources
= []
613 def get_stability(self
):
614 return self
.user_stability
or self
.upstream_stability
or testing
620 return "v%s (%s)" % (self
.get_version(), self
.id)
622 def __cmp__(self
, other
):
623 """Newer versions come first"""
624 d
= cmp(other
.version
, self
.version
)
626 # If the version number is the same, just give a stable sort order, and
627 # ensure that two different implementations don't compare equal.
628 d
= cmp(other
.feed
.url
, self
.feed
.url
)
630 return cmp(other
.id, self
.id)
632 def get_version(self
):
633 """Return the version as a string.
634 @see: L{format_version}
636 return format_version(self
.version
)
638 arch
= property(lambda self
: _join_arch(self
.os
, self
.machine
))
643 requires_root_install
= False
646 """"@deprecated: use commands["run"] instead"""
647 main
= self
.commands
.get("run", None)
651 def _set_main(self
, path
):
652 """"@deprecated: use commands["run"] instead"""
654 if "run" in self
.commands
:
655 del self
.commands
["run"]
657 self
.commands
["run"] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'path': path
}), None)
658 main
= property(_get_main
, _set_main
)
660 def is_available(self
, stores
):
661 """Is this Implementation available locally?
662 (a local implementation, an installed distribution package, or a cached ZeroInstallImplementation)
666 raise NotImplementedError("abstract")
668 class DistributionImplementation(Implementation
):
669 """An implementation provided by the distribution. Information such as the version
670 comes from the package manager.
672 __slots__
= ['distro', 'installed']
674 def __init__(self
, feed
, id, distro
):
675 assert id.startswith('package:')
676 Implementation
.__init
__(self
, feed
, id)
678 self
.installed
= False
681 def requires_root_install(self
):
682 return not self
.installed
684 def is_available(self
, stores
):
685 return self
.installed
687 class ZeroInstallImplementation(Implementation
):
688 """An implementation where all the information comes from Zero Install.
689 @ivar digests: a list of "algorith=value" strings (since 0.45)
692 __slots__
= ['os', 'size', 'digests', 'local_path']
694 def __init__(self
, feed
, id, local_path
):
695 """id can be a local path (string starting with /) or a manifest hash (eg "sha1=XXX")"""
696 assert not id.startswith('package:'), id
697 Implementation
.__init
__(self
, feed
, id)
701 self
.local_path
= local_path
704 dependencies
= property(lambda self
: dict([(x
.interface
, x
) for x
in self
.requires
705 if isinstance(x
, InterfaceDependency
)]))
707 def add_download_source(self
, url
, size
, extract
, start_offset
= 0, type = None):
708 """Add a download source."""
709 self
.download_sources
.append(DownloadSource(self
, url
, size
, extract
, start_offset
, type))
711 def set_arch(self
, arch
):
712 self
.os
, self
.machine
= _split_arch(arch
)
713 arch
= property(lambda self
: _join_arch(self
.os
, self
.machine
), set_arch
)
715 def is_available(self
, stores
):
716 if self
.local_path
is not None:
717 return os
.path
.exists(self
.local_path
)
719 path
= stores
.lookup_maybe(self
.digests
)
720 return path
is not None
721 return False # (0compile creates fake entries with no digests)
723 class Interface(object):
724 """An Interface represents some contract of behaviour.
725 @ivar uri: the URI for this interface.
726 @ivar stability_policy: user's configured policy.
727 Implementations at this level or higher are preferred.
728 Lower levels are used only if there is no other choice.
730 __slots__
= ['uri', 'stability_policy', 'extra_feeds']
732 implementations
= property(lambda self
: self
._main
_feed
.implementations
)
733 name
= property(lambda self
: self
._main
_feed
.name
)
734 description
= property(lambda self
: self
._main
_feed
.description
)
735 summary
= property(lambda self
: self
._main
_feed
.summary
)
736 last_modified
= property(lambda self
: self
._main
_feed
.last_modified
)
737 feeds
= property(lambda self
: self
.extra_feeds
+ self
._main
_feed
.feeds
)
738 metadata
= property(lambda self
: self
._main
_feed
.metadata
)
740 last_checked
= property(lambda self
: self
._main
_feed
.last_checked
)
742 def __init__(self
, uri
):
744 if uri
.startswith('http:') or uri
.startswith('https:') or os
.path
.isabs(uri
):
747 raise SafeException(_("Interface name '%s' doesn't start "
748 "with 'http:' or 'https:'") % uri
)
751 def _get_feed_for(self
):
753 for key
in self
._main
_feed
.feed_for
:
756 feed_for
= property(_get_feed_for
) # Deprecated (used by 0publish)
759 self
.extra_feeds
= []
760 self
.stability_policy
= None
763 from zeroinstall
.injector
.iface_cache
import iface_cache
764 feed
= iface_cache
.get_feed(self
.uri
)
766 return feed
.get_name()
767 return '(' + os
.path
.basename(self
.uri
) + ')'
770 return _("<Interface %s>") % self
.uri
772 def set_stability_policy(self
, new
):
773 assert new
is None or isinstance(new
, Stability
)
774 self
.stability_policy
= new
776 def get_feed(self
, url
):
778 #warnings.warn("use iface_cache.get_feed instead", DeprecationWarning, 2)
779 for x
in self
.extra_feeds
:
782 #return self._main_feed.get_feed(url)
785 def get_metadata(self
, uri
, name
):
786 return self
._main
_feed
.get_metadata(uri
, name
)
789 def _main_feed(self
):
791 #warnings.warn("use the feed instead", DeprecationWarning, 3)
792 from zeroinstall
.injector
import policy
793 iface_cache
= policy
.get_deprecated_singleton_config().iface_cache
794 feed
= iface_cache
.get_feed(self
.uri
)
799 def _merge_attrs(attrs
, item
):
800 """Add each attribute of item to a copy of attrs and return the copy.
801 @type attrs: {str: str}
802 @type item: L{qdom.Element}
807 new
[str(a
)] = item
.attrs
[a
]
810 def _get_long(elem
, attr_name
):
811 val
= elem
.getAttribute(attr_name
)
816 raise SafeException(_("Invalid value for integer attribute '%(attribute_name)s': %(value)s") % {'attribute_name': attr_name
, 'value': val
})
819 class ZeroInstallFeed(object):
820 """A feed lists available implementations of an interface.
821 @ivar url: the URL for this feed
822 @ivar implementations: Implementations in this feed, indexed by ID
823 @type implementations: {str: L{Implementation}}
824 @ivar name: human-friendly name
825 @ivar summaries: short textual description (in various languages, since 0.49)
826 @type summaries: {str: str}
827 @ivar descriptions: long textual description (in various languages, since 0.49)
828 @type descriptions: {str: str}
829 @ivar last_modified: timestamp on signature
830 @ivar last_checked: time feed was last successfully downloaded and updated
831 @ivar feeds: list of <feed> elements in this feed
832 @type feeds: [L{Feed}]
833 @ivar feed_for: interfaces for which this could be a feed
834 @type feed_for: set(str)
835 @ivar metadata: extra elements we didn't understand
837 # _main is deprecated
838 __slots__
= ['url', 'implementations', 'name', 'descriptions', 'first_description', 'summaries', 'first_summary', '_package_implementations',
839 'last_checked', 'last_modified', 'feeds', 'feed_for', 'metadata']
841 def __init__(self
, feed_element
, local_path
= None, distro
= None):
842 """Create a feed object from a DOM.
843 @param feed_element: the root element of a feed file
844 @type feed_element: L{qdom.Element}
845 @param local_path: the pathname of this local feed, or None for remote feeds"""
846 self
.implementations
= {}
848 self
.summaries
= {} # { lang: str }
849 self
.first_summary
= None
850 self
.descriptions
= {} # { lang: str }
851 self
.first_description
= None
852 self
.last_modified
= None
854 self
.feed_for
= set()
856 self
.last_checked
= None
857 self
._package
_implementations
= []
859 if distro
is not None:
861 warnings
.warn("distro argument is now ignored", DeprecationWarning, 2)
863 if feed_element
is None:
864 return # XXX subclass?
866 assert feed_element
.name
in ('interface', 'feed'), "Root element should be <interface>, not %s" % feed_element
867 assert feed_element
.uri
== XMLNS_IFACE
, "Wrong namespace on root element: %s" % feed_element
.uri
869 main
= feed_element
.getAttribute('main')
870 #if main: warn("Setting 'main' on the root element is deprecated. Put it on a <group> instead")
873 self
.url
= local_path
874 local_dir
= os
.path
.dirname(local_path
)
876 self
.url
= feed_element
.getAttribute('uri')
878 raise InvalidInterface(_("<interface> uri attribute missing"))
879 local_dir
= None # Can't have relative paths
881 min_injector_version
= feed_element
.getAttribute('min-injector-version')
882 if min_injector_version
:
883 if parse_version(min_injector_version
) > parse_version(version
):
884 raise InvalidInterface(_("This feed requires version %(min_version)s or later of "
885 "Zero Install, but I am only version %(version)s. "
886 "You can get a newer version from http://0install.net") %
887 {'min_version': min_injector_version
, 'version': version
})
889 for x
in feed_element
.childNodes
:
890 if x
.uri
!= XMLNS_IFACE
:
891 self
.metadata
.append(x
)
894 self
.name
= x
.content
895 elif x
.name
== 'description':
896 if self
.first_description
== None:
897 self
.first_description
= x
.content
898 self
.descriptions
[x
.attrs
.get("http://www.w3.org/XML/1998/namespace lang", 'en')] = x
.content
899 elif x
.name
== 'summary':
900 if self
.first_summary
== None:
901 self
.first_summary
= x
.content
902 self
.summaries
[x
.attrs
.get("http://www.w3.org/XML/1998/namespace lang", 'en')] = x
.content
903 elif x
.name
== 'feed-for':
904 feed_iface
= x
.getAttribute('interface')
906 raise InvalidInterface(_('Missing "interface" attribute in <feed-for>'))
907 self
.feed_for
.add(feed_iface
)
908 # Bug report from a Debian/stable user that --feed gets the wrong value.
909 # Can't reproduce (even in a Debian/stable chroot), but add some logging here
910 # in case it happens again.
911 debug(_("Is feed-for %s"), feed_iface
)
912 elif x
.name
== 'feed':
913 feed_src
= x
.getAttribute('src')
915 raise InvalidInterface(_('Missing "src" attribute in <feed>'))
916 if feed_src
.startswith('http:') or feed_src
.startswith('https:') or local_path
:
917 langs
= x
.getAttribute('langs')
918 if langs
: langs
= langs
.replace('_', '-')
919 self
.feeds
.append(Feed(feed_src
, x
.getAttribute('arch'), False, langs
= langs
))
921 raise InvalidInterface(_("Invalid feed URL '%s'") % feed_src
)
923 self
.metadata
.append(x
)
926 raise InvalidInterface(_("Missing <name> in feed"))
928 raise InvalidInterface(_("Missing <summary> in feed"))
930 def process_group(group
, group_attrs
, base_depends
, base_bindings
, base_commands
):
931 for item
in group
.childNodes
:
932 if item
.uri
!= XMLNS_IFACE
: continue
934 if item
.name
not in ('group', 'implementation', 'package-implementation'):
937 # We've found a group or implementation. Scan for dependencies,
938 # bindings and commands. Doing this here means that:
939 # - We can share the code for groups and implementations here.
940 # - The order doesn't matter, because these get processed first.
941 # A side-effect is that the document root cannot contain
944 depends
= base_depends
[:]
945 bindings
= base_bindings
[:]
946 commands
= base_commands
.copy()
948 for attr
, command
in [('main', 'run'),
949 ('self-test', 'test')]:
950 value
= item
.attrs
.get(attr
, None)
951 if value
is not None:
952 commands
[command
] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'name': command
, 'path': value
}), None)
954 for child
in item
.childNodes
:
955 if child
.uri
!= XMLNS_IFACE
: continue
956 if child
.name
== 'requires':
957 dep
= process_depends(child
, local_dir
)
959 elif child
.name
== 'command':
960 command_name
= child
.attrs
.get('name', None)
962 raise InvalidInterface('Missing name for <command>')
963 commands
[command_name
] = Command(child
, local_dir
)
964 elif child
.name
in binding_names
:
965 bindings
.append(process_binding(child
))
967 compile_command
= item
.attrs
.get('http://zero-install.sourceforge.net/2006/namespaces/0compile command')
968 if compile_command
is not None:
969 commands
['compile'] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'name': 'compile', 'shell-command': compile_command
}), None)
971 item_attrs
= _merge_attrs(group_attrs
, item
)
973 if item
.name
== 'group':
974 process_group(item
, item_attrs
, depends
, bindings
, commands
)
975 elif item
.name
== 'implementation':
976 process_impl(item
, item_attrs
, depends
, bindings
, commands
)
977 elif item
.name
== 'package-implementation':
979 warn("A <package-implementation> with dependencies in %s!", self
.url
)
980 self
._package
_implementations
.append((item
, item_attrs
))
984 def process_impl(item
, item_attrs
, depends
, bindings
, commands
):
985 id = item
.getAttribute('id')
987 raise InvalidInterface(_("Missing 'id' attribute on %s") % item
)
988 local_path
= item_attrs
.get('local-path')
989 if local_dir
and local_path
:
990 abs_local_path
= os
.path
.abspath(os
.path
.join(local_dir
, local_path
))
991 impl
= ZeroInstallImplementation(self
, id, abs_local_path
)
992 elif local_dir
and (id.startswith('/') or id.startswith('.')):
994 id = os
.path
.abspath(os
.path
.join(local_dir
, id))
995 impl
= ZeroInstallImplementation(self
, id, id)
997 impl
= ZeroInstallImplementation(self
, id, None)
999 # In older feeds, the ID was the (single) digest
1000 impl
.digests
.append(id)
1001 if id in self
.implementations
:
1002 warn(_("Duplicate ID '%(id)s' in feed '%(feed)s'"), {'id': id, 'feed': self
})
1003 self
.implementations
[id] = impl
1005 impl
.metadata
= item_attrs
1007 version_mod
= item_attrs
.get('version-modifier', None)
1009 item_attrs
['version'] += version_mod
1010 del item_attrs
['version-modifier']
1011 version
= item_attrs
['version']
1013 raise InvalidInterface(_("Missing version attribute"))
1014 impl
.version
= parse_version(version
)
1016 impl
.commands
= commands
1018 impl
.released
= item_attrs
.get('released', None)
1019 impl
.langs
= item_attrs
.get('langs', '').replace('_', '-')
1021 size
= item
.getAttribute('size')
1023 impl
.size
= int(size
)
1024 impl
.arch
= item_attrs
.get('arch', None)
1026 stability
= stability_levels
[str(item_attrs
['stability'])]
1028 stab
= str(item_attrs
['stability'])
1029 if stab
!= stab
.lower():
1030 raise InvalidInterface(_('Stability "%s" invalid - use lower case!') % item_attrs
.stability
)
1031 raise InvalidInterface(_('Stability "%s" invalid') % item_attrs
['stability'])
1032 if stability
>= preferred
:
1033 raise InvalidInterface(_("Upstream can't set stability to preferred!"))
1034 impl
.upstream_stability
= stability
1036 impl
.bindings
= bindings
1037 impl
.requires
= depends
1039 for elem
in item
.childNodes
:
1040 if elem
.uri
!= XMLNS_IFACE
: continue
1041 if elem
.name
== 'archive':
1042 url
= elem
.getAttribute('href')
1044 raise InvalidInterface(_("Missing href attribute on <archive>"))
1045 size
= elem
.getAttribute('size')
1047 raise InvalidInterface(_("Missing size attribute on <archive>"))
1048 impl
.add_download_source(url
= url
, size
= int(size
),
1049 extract
= elem
.getAttribute('extract'),
1050 start_offset
= _get_long(elem
, 'start-offset'),
1051 type = elem
.getAttribute('type'))
1052 elif elem
.name
== 'manifest-digest':
1053 for aname
, avalue
in elem
.attrs
.iteritems():
1054 if ' ' not in aname
:
1055 impl
.digests
.append('%s=%s' % (aname
, avalue
))
1056 elif elem
.name
== 'recipe':
1058 for recipe_step
in elem
.childNodes
:
1059 if recipe_step
.uri
== XMLNS_IFACE
and recipe_step
.name
== 'archive':
1060 url
= recipe_step
.getAttribute('href')
1062 raise InvalidInterface(_("Missing href attribute on <archive>"))
1063 size
= recipe_step
.getAttribute('size')
1065 raise InvalidInterface(_("Missing size attribute on <archive>"))
1066 recipe
.steps
.append(DownloadSource(None, url
= url
, size
= int(size
),
1067 extract
= recipe_step
.getAttribute('extract'),
1068 start_offset
= _get_long(recipe_step
, 'start-offset'),
1069 type = recipe_step
.getAttribute('type')))
1071 info(_("Unknown step '%s' in recipe; skipping recipe"), recipe_step
.name
)
1074 impl
.download_sources
.append(recipe
)
1076 root_attrs
= {'stability': 'testing'}
1079 info("Note: @main on document element is deprecated in %s", self
)
1080 root_commands
['run'] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'path': main
}), None)
1081 process_group(feed_element
, root_attrs
, [], [], root_commands
)
1083 def get_distro_feed(self
):
1084 """Does this feed contain any <pacakge-implementation> elements?
1085 i.e. is it worth asking the package manager for more information?
1086 @return: the URL of the virtual feed, or None
1088 if self
._package
_implementations
:
1089 return "distribution:" + self
.url
1092 def get_package_impls(self
, distro
):
1093 """Find the best <pacakge-implementation> element(s) for the given distribution.
1094 @param distro: the distribution to use to rate them
1095 @type distro: L{distro.Distribution}
1096 @return: a list of tuples for the best ranked elements
1102 for item
, item_attrs
in self
._package
_implementations
:
1103 distro_names
= item_attrs
.get('distributions', '')
1104 for distro_name
in distro_names
.split(' '):
1105 score
= distro
.get_score(distro_name
)
1106 if score
> best_score
:
1109 if score
== best_score
:
1110 best_impls
.append((item
, item_attrs
))
1114 return self
.name
or '(' + os
.path
.basename(self
.url
) + ')'
1117 return _("<Feed %s>") % self
.url
1119 def set_stability_policy(self
, new
):
1120 assert new
is None or isinstance(new
, Stability
)
1121 self
.stability_policy
= new
1123 def get_feed(self
, url
):
1124 for x
in self
.feeds
:
1129 def add_metadata(self
, elem
):
1130 self
.metadata
.append(elem
)
1132 def get_metadata(self
, uri
, name
):
1133 """Return a list of interface metadata elements with this name and namespace URI."""
1134 return [m
for m
in self
.metadata
if m
.name
== name
and m
.uri
== uri
]
1138 return _best_language_match(self
.summaries
) or self
.first_summary
1141 def description(self
):
1142 return _best_language_match(self
.descriptions
) or self
.first_description
1144 class DummyFeed(object):
1145 """Temporary class used during API transition."""
1146 last_modified
= None
1148 last_checked
= property(lambda self
: None)
1149 implementations
= property(lambda self
: {})
1150 feeds
= property(lambda self
: [])
1151 summary
= property(lambda self
: '-')
1152 description
= property(lambda self
: '')
1153 def get_name(self
): return self
.name
1154 def get_feed(self
, url
): return None
1155 def get_metadata(self
, uri
, name
): return []
1156 _dummy_feed
= DummyFeed()
1159 """Convert each %20 to a space, etc.
1161 uri
= uri
.replace('#', '/')
1162 if '%' not in uri
: return uri
1163 return re
.sub('%[0-9a-fA-F][0-9a-fA-F]',
1164 lambda match
: chr(int(match
.group(0)[1:], 16)),
1165 uri
).decode('utf-8')
1168 """Convert each space to %20, etc
1170 return re
.sub('[^-_.a-zA-Z0-9]',
1171 lambda match
: '%%%02x' % ord(match
.group(0)),
1172 uri
.encode('utf-8'))
1174 def _pretty_escape(uri
):
1175 """Convert each space to %20, etc
1176 : is preserved and / becomes #. This makes for nicer strings,
1177 and may replace L{escape} everywhere in future.
1179 if os
.name
== "posix":
1180 # Only preserve : on Posix systems
1181 preserveRegex
= '[^-_.a-zA-Z0-9:/]'
1183 # Other OSes may not allow the : character in file names
1184 preserveRegex
= '[^-_.a-zA-Z0-9/]'
1185 return re
.sub(preserveRegex
,
1186 lambda match
: '%%%02x' % ord(match
.group(0)),
1187 uri
.encode('utf-8')).replace('/', '#')
1189 def canonical_iface_uri(uri
):
1190 """If uri is a relative path, convert to an absolute one.
1191 A "file:///foo" URI is converted to "/foo".
1192 An "alias:prog" URI expands to the URI in the 0alias script
1193 Otherwise, return it unmodified.
1195 @raise SafeException: if uri isn't valid
1197 if uri
.startswith('http://') or uri
.startswith('https://'):
1198 if uri
.count("/") < 3:
1199 raise SafeException(_("Missing / after hostname in URI '%s'") % uri
)
1201 elif uri
.startswith('file:///'):
1203 elif uri
.startswith('alias:'):
1204 from zeroinstall
import alias
, support
1205 alias_prog
= uri
[6:]
1206 if not os
.path
.isabs(alias_prog
):
1207 full_path
= support
.find_in_path(alias_prog
)
1209 raise alias
.NotAnAliasScript("Not found in $PATH: " + alias_prog
)
1211 full_path
= alias_prog
1212 return alias
.parse_script(full_path
).uri
1214 iface_uri
= os
.path
.realpath(uri
)
1215 if os
.path
.isfile(iface_uri
):
1217 raise SafeException(_("Bad interface name '%(uri)s'.\n"
1218 "(doesn't start with 'http:', and "
1219 "doesn't exist as a local file '%(interface_uri)s' either)") %
1220 {'uri': uri
, 'interface_uri': iface_uri
})
1222 _version_mod_to_value
= {
1230 _version_value_to_mod
= {}
1231 for x
in _version_mod_to_value
: _version_value_to_mod
[_version_mod_to_value
[x
]] = x
1234 _version_re
= re
.compile('-([a-z]*)')
1236 def parse_version(version_string
):
1237 """Convert a version string to an internal representation.
1238 The parsed format can be compared quickly using the standard Python functions.
1239 - Version := DottedList ("-" Mod DottedList?)*
1240 - DottedList := (Integer ("." Integer)*)
1241 @rtype: tuple (opaque)
1242 @raise SafeException: if the string isn't a valid version
1243 @since: 0.24 (moved from L{reader}, from where it is still available):"""
1244 if version_string
is None: return None
1245 parts
= _version_re
.split(version_string
)
1247 del parts
[-1] # Ends with a modifier
1251 raise SafeException(_("Empty version string!"))
1254 for x
in range(0, l
, 2):
1257 parts
[x
] = map(int, parts
[x
].split('.'))
1259 parts
[x
] = [] # (because ''.split('.') == [''], not [])
1260 for x
in range(1, l
, 2):
1261 parts
[x
] = _version_mod_to_value
[parts
[x
]]
1263 except ValueError as ex
:
1264 raise SafeException(_("Invalid version format in '%(version_string)s': %(exception)s") % {'version_string': version_string
, 'exception': ex
})
1265 except KeyError as ex
:
1266 raise SafeException(_("Invalid version modifier in '%(version_string)s': %(exception)s") % {'version_string': version_string
, 'exception': ex
})
1268 def format_version(version
):
1269 """Format a parsed version for display. Undoes the effect of L{parse_version}.
1270 @see: L{Implementation.get_version}
1273 version
= version
[:]
1275 for x
in range(0, l
, 2):
1276 version
[x
] = '.'.join(map(str, version
[x
]))
1277 for x
in range(1, l
, 2):
1278 version
[x
] = '-' + _version_value_to_mod
[version
[x
]]
1279 if version
[-1] == '-': del version
[-1]
1280 return ''.join(version
)