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."""
247 class EnvironmentBinding(Binding
):
248 """Indicate the chosen implementation using an environment variable."""
249 __slots__
= ['name', 'insert', 'default', 'mode', 'value']
255 def __init__(self
, name
, insert
, default
= None, mode
= PREPEND
, value
=None, separator
=None):
257 mode argument added in version 0.28
258 value argument added in version 0.52
262 self
.default
= default
265 if separator
is None:
266 self
.separator
= os
.pathsep
268 self
.separator
= separator
272 return _("<environ %(name)s %(mode)s %(insert)s %(value)s>") % {'name': self
.name
,'mode': self
.mode
, 'insert': self
.insert
, 'value': self
.value
}
276 def get_value(self
, path
, old_value
):
277 """Calculate the new value of the environment variable after applying this binding.
278 @param path: the path to the selected implementation
279 @param old_value: the current value of the environment variable
280 @return: the new value for the environment variable"""
282 if self
.insert
is not None:
283 extra
= os
.path
.join(path
, self
.insert
)
285 assert self
.value
is not None
288 if self
.mode
== EnvironmentBinding
.REPLACE
:
291 if old_value
is None:
292 old_value
= self
.default
or defaults
.get(self
.name
, None)
293 if old_value
is None:
295 if self
.mode
== EnvironmentBinding
.PREPEND
:
296 return extra
+ self
.separator
+ old_value
298 return old_value
+ self
.separator
+ extra
300 def _toxml(self
, doc
, prefixes
):
301 """Create a DOM element for this binding.
302 @param doc: document to use to create the element
303 @return: the new element
305 env_elem
= doc
.createElementNS(XMLNS_IFACE
, 'environment')
306 env_elem
.setAttributeNS(None, 'name', self
.name
)
307 if self
.mode
is not None:
308 env_elem
.setAttributeNS(None, 'mode', self
.mode
)
309 if self
.insert
is not None:
310 env_elem
.setAttributeNS(None, 'insert', self
.insert
)
312 env_elem
.setAttributeNS(None, 'value', self
.value
)
314 env_elem
.setAttributeNS(None, 'default', self
.default
)
316 env_elem
.setAttributeNS(None, 'separator', self
.separator
)
319 class ExecutableBinding(Binding
):
320 """Make the chosen command available in $PATH.
321 @ivar in_path: True to add the named command to $PATH, False to store in named variable
326 def __init__(self
, qdom
, in_path
):
328 self
.in_path
= in_path
331 return str(self
.qdom
)
335 def _toxml(self
, doc
, prefixes
):
336 return self
.qdom
.toDOM(doc
, prefixes
)
340 return self
.qdom
.getAttribute('name')
342 class OverlayBinding(Binding
):
343 """Make the chosen implementation available by overlaying it onto another part of the file-system.
344 This is to support legacy programs which use hard-coded paths."""
345 __slots__
= ['src', 'mount_point']
347 def __init__(self
, src
, mount_point
):
349 self
.mount_point
= mount_point
352 return _("<overlay %(src)s on %(mount_point)s>") % {'src': self
.src
or '.', 'mount_point': self
.mount_point
or '/'}
356 def _toxml(self
, doc
):
357 """Create a DOM element for this binding.
358 @param doc: document to use to create the element
359 @return: the new element
361 env_elem
= doc
.createElementNS(XMLNS_IFACE
, 'overlay')
362 if self
.src
is not None:
363 env_elem
.setAttributeNS(None, 'src', self
.src
)
364 if self
.mount_point
is not None:
365 env_elem
.setAttributeNS(None, 'mount-point', self
.mount_point
)
369 """An interface's feeds are other interfaces whose implementations can also be
370 used as implementations of this interface."""
371 __slots__
= ['uri', 'os', 'machine', 'user_override', 'langs']
372 def __init__(self
, uri
, arch
, user_override
, langs
= None):
374 # This indicates whether the feed comes from the user's overrides
375 # file. If true, writer.py will write it when saving.
376 self
.user_override
= user_override
377 self
.os
, self
.machine
= _split_arch(arch
)
381 return "<Feed from %s>" % self
.uri
384 arch
= property(lambda self
: _join_arch(self
.os
, self
.machine
))
386 class Dependency(object):
387 """A Dependency indicates that an Implementation requires some additional
388 code to function. This is an abstract base class.
389 @ivar qdom: the XML element for this Dependency (since 0launch 0.51)
390 @type qdom: L{qdom.Element}
391 @ivar metadata: any extra attributes from the XML element
392 @type metadata: {str: str}
396 Essential
= "essential"
397 Recommended
= "recommended"
399 def __init__(self
, element
):
400 assert isinstance(element
, qdom
.Element
), type(element
) # Use InterfaceDependency instead!
405 return self
.qdom
.attrs
408 def importance(self
):
409 return self
.qdom
.getAttribute("importance") or Dependency
.Essential
411 class InterfaceDependency(Dependency
):
412 """A Dependency on a Zero Install interface.
413 @ivar interface: the interface required by this dependency
415 @ivar restrictions: a list of constraints on acceptable implementations
416 @type restrictions: [L{Restriction}]
417 @ivar bindings: how to make the choice of implementation known
418 @type bindings: [L{Binding}]
421 __slots__
= ['interface', 'restrictions', 'bindings']
423 def __init__(self
, interface
, restrictions
= None, element
= None):
424 Dependency
.__init
__(self
, element
)
425 assert isinstance(interface
, (str, unicode))
427 self
.interface
= interface
428 if restrictions
is None:
429 self
.restrictions
= []
431 self
.restrictions
= restrictions
435 return _("<Dependency on %(interface)s; bindings: %(bindings)s%(restrictions)s>") % {'interface': self
.interface
, 'bindings': self
.bindings
, 'restrictions': self
.restrictions
}
439 return self
.qdom
.getAttribute("command") or ('run' if self
.qdom
.name
== 'runner' else None)
442 class RetrievalMethod(object):
443 """A RetrievalMethod provides a way to fetch an implementation."""
446 class DownloadSource(RetrievalMethod
):
447 """A DownloadSource provides a way to fetch an implementation."""
448 __slots__
= ['implementation', 'url', 'size', 'extract', 'start_offset', 'type']
450 def __init__(self
, implementation
, url
, size
, extract
, start_offset
= 0, type = None):
451 self
.implementation
= implementation
454 self
.extract
= extract
455 self
.start_offset
= start_offset
456 self
.type = type # MIME type - see unpack.py
458 class Recipe(RetrievalMethod
):
459 """Get an implementation by following a series of steps.
460 @ivar size: the combined download sizes from all the steps
462 @ivar steps: the sequence of steps which must be performed
463 @type steps: [L{RetrievalMethod}]"""
464 __slots__
= ['steps']
469 size
= property(lambda self
: sum([x
.size
for x
in self
.steps
]))
471 class DistributionSource(RetrievalMethod
):
472 """A package that is installed using the distribution's tools (including PackageKit).
473 @ivar install: a function to call to install this package
474 @type install: (L{handler.Handler}) -> L{tasks.Blocker}
475 @ivar package_id: the package name, in a form recognised by the distribution's tools
476 @type package_id: str
477 @ivar size: the download size in bytes
479 @ivar needs_confirmation: whether the user should be asked to confirm before calling install()
480 @type needs_confirmation: bool"""
482 __slots__
= ['package_id', 'size', 'install', 'needs_confirmation']
484 def __init__(self
, package_id
, size
, install
, needs_confirmation
= True):
485 RetrievalMethod
.__init
__(self
)
486 self
.package_id
= package_id
488 self
.install
= install
489 self
.needs_confirmation
= needs_confirmation
491 class Command(object):
492 """A Command is a way of running an Implementation as a program."""
494 __slots__
= ['qdom', '_depends', '_local_dir', '_runner']
496 def __init__(self
, qdom
, local_dir
):
497 """@param qdom: the <command> element
498 @param local_dir: the directory containing the feed (for relative dependencies), or None if not local
500 assert qdom
.name
== 'command', 'not <command>: %s' % qdom
502 self
._local
_dir
= local_dir
505 path
= property(lambda self
: self
.qdom
.attrs
.get("path", None))
507 def _toxml(self
, doc
, prefixes
):
508 return self
.qdom
.toDOM(doc
, prefixes
)
512 if self
._depends
is None:
515 for child
in self
.qdom
.childNodes
:
516 if child
.name
== 'requires':
517 dep
= process_depends(child
, self
._local
_dir
)
519 elif child
.name
== 'runner':
521 raise InvalidInterface(_("Multiple <runner>s in <command>!"))
522 dep
= process_depends(child
, self
._local
_dir
)
525 self
._depends
= depends
528 def get_runner(self
):
529 self
.requires
# (sets _runner)
533 return str(self
.qdom
)
535 class Implementation(object):
536 """An Implementation is a package which implements an Interface.
537 @ivar download_sources: list of methods of getting this implementation
538 @type download_sources: [L{RetrievalMethod}]
539 @ivar feed: the feed owning this implementation (since 0.32)
540 @type feed: [L{ZeroInstallFeed}]
541 @ivar bindings: how to tell this component where it itself is located (since 0.31)
542 @type bindings: [Binding]
543 @ivar upstream_stability: the stability reported by the packager
544 @type upstream_stability: [insecure | buggy | developer | testing | stable | packaged]
545 @ivar user_stability: the stability as set by the user
546 @type upstream_stability: [insecure | buggy | developer | testing | stable | packaged | preferred]
547 @ivar langs: natural languages supported by this package
549 @ivar requires: interfaces this package depends on
550 @type requires: [L{Dependency}]
551 @ivar commands: ways to execute as a program
552 @type commands: {str: Command}
553 @ivar metadata: extra metadata from the feed
554 @type metadata: {"[URI ]localName": str}
555 @ivar id: a unique identifier for this Implementation
556 @ivar version: a parsed version number
557 @ivar released: release date
558 @ivar local_path: the directory containing this local implementation, or None if it isn't local (id isn't a path)
559 @type local_path: str | None
560 @ivar requires_root_install: whether the user will need admin rights to use this
561 @type requires_root_install: bool
564 # Note: user_stability shouldn't really be here
566 __slots__
= ['upstream_stability', 'user_stability', 'langs',
567 'requires', 'metadata', 'download_sources', 'commands',
568 'id', 'feed', 'version', 'released', 'bindings', 'machine']
570 def __init__(self
, feed
, id):
574 self
.user_stability
= None
575 self
.upstream_stability
= None
576 self
.metadata
= {} # [URI + " "] + localName -> value
580 self
.download_sources
= []
586 def get_stability(self
):
587 return self
.user_stability
or self
.upstream_stability
or testing
593 return "v%s (%s)" % (self
.get_version(), self
.id)
595 def __cmp__(self
, other
):
596 """Newer versions come first"""
597 d
= cmp(other
.version
, self
.version
)
599 # If the version number is the same, just give a stable sort order, and
600 # ensure that two different implementations don't compare equal.
601 d
= cmp(other
.feed
.url
, self
.feed
.url
)
603 return cmp(other
.id, self
.id)
605 def get_version(self
):
606 """Return the version as a string.
607 @see: L{format_version}
609 return format_version(self
.version
)
611 arch
= property(lambda self
: _join_arch(self
.os
, self
.machine
))
616 requires_root_install
= False
619 """"@deprecated: use commands["run"] instead"""
620 main
= self
.commands
.get("run", None)
624 def _set_main(self
, path
):
625 """"@deprecated: use commands["run"] instead"""
627 if "run" in self
.commands
:
628 del self
.commands
["run"]
630 self
.commands
["run"] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'path': path
}), None)
631 main
= property(_get_main
, _set_main
)
633 def is_available(self
, stores
):
634 """Is this Implementation available locally?
635 (a local implementation, an installed distribution package, or a cached ZeroInstallImplementation)
639 raise NotImplementedError("abstract")
641 class DistributionImplementation(Implementation
):
642 """An implementation provided by the distribution. Information such as the version
643 comes from the package manager.
645 __slots__
= ['distro', 'installed']
647 def __init__(self
, feed
, id, distro
):
648 assert id.startswith('package:')
649 Implementation
.__init
__(self
, feed
, id)
651 self
.installed
= False
654 def requires_root_install(self
):
655 return not self
.installed
657 def is_available(self
, stores
):
658 return self
.installed
660 class ZeroInstallImplementation(Implementation
):
661 """An implementation where all the information comes from Zero Install.
662 @ivar digests: a list of "algorith=value" strings (since 0.45)
665 __slots__
= ['os', 'size', 'digests', 'local_path']
667 def __init__(self
, feed
, id, local_path
):
668 """id can be a local path (string starting with /) or a manifest hash (eg "sha1=XXX")"""
669 assert not id.startswith('package:'), id
670 Implementation
.__init
__(self
, feed
, id)
674 self
.local_path
= local_path
677 dependencies
= property(lambda self
: dict([(x
.interface
, x
) for x
in self
.requires
678 if isinstance(x
, InterfaceDependency
)]))
680 def add_download_source(self
, url
, size
, extract
, start_offset
= 0, type = None):
681 """Add a download source."""
682 self
.download_sources
.append(DownloadSource(self
, url
, size
, extract
, start_offset
, type))
684 def set_arch(self
, arch
):
685 self
.os
, self
.machine
= _split_arch(arch
)
686 arch
= property(lambda self
: _join_arch(self
.os
, self
.machine
), set_arch
)
688 def is_available(self
, stores
):
689 if self
.local_path
is not None:
690 return os
.path
.exists(self
.local_path
)
692 path
= stores
.lookup_maybe(self
.digests
)
693 return path
is not None
694 return False # (0compile creates fake entries with no digests)
696 class Interface(object):
697 """An Interface represents some contract of behaviour.
698 @ivar uri: the URI for this interface.
699 @ivar stability_policy: user's configured policy.
700 Implementations at this level or higher are preferred.
701 Lower levels are used only if there is no other choice.
703 __slots__
= ['uri', 'stability_policy', 'extra_feeds']
705 implementations
= property(lambda self
: self
._main
_feed
.implementations
)
706 name
= property(lambda self
: self
._main
_feed
.name
)
707 description
= property(lambda self
: self
._main
_feed
.description
)
708 summary
= property(lambda self
: self
._main
_feed
.summary
)
709 last_modified
= property(lambda self
: self
._main
_feed
.last_modified
)
710 feeds
= property(lambda self
: self
.extra_feeds
+ self
._main
_feed
.feeds
)
711 metadata
= property(lambda self
: self
._main
_feed
.metadata
)
713 last_checked
= property(lambda self
: self
._main
_feed
.last_checked
)
715 def __init__(self
, uri
):
717 if uri
.startswith('http:') or uri
.startswith('https:') or os
.path
.isabs(uri
):
720 raise SafeException(_("Interface name '%s' doesn't start "
721 "with 'http:' or 'https:'") % uri
)
724 def _get_feed_for(self
):
726 for key
in self
._main
_feed
.feed_for
:
729 feed_for
= property(_get_feed_for
) # Deprecated (used by 0publish)
732 self
.extra_feeds
= []
733 self
.stability_policy
= None
736 from zeroinstall
.injector
.iface_cache
import iface_cache
737 feed
= iface_cache
.get_feed(self
.uri
)
739 return feed
.get_name()
740 return '(' + os
.path
.basename(self
.uri
) + ')'
743 return _("<Interface %s>") % self
.uri
745 def set_stability_policy(self
, new
):
746 assert new
is None or isinstance(new
, Stability
)
747 self
.stability_policy
= new
749 def get_feed(self
, url
):
751 #warnings.warn("use iface_cache.get_feed instead", DeprecationWarning, 2)
752 for x
in self
.extra_feeds
:
755 #return self._main_feed.get_feed(url)
758 def get_metadata(self
, uri
, name
):
759 return self
._main
_feed
.get_metadata(uri
, name
)
762 def _main_feed(self
):
764 #warnings.warn("use the feed instead", DeprecationWarning, 3)
765 from zeroinstall
.injector
import policy
766 iface_cache
= policy
.get_deprecated_singleton_config().iface_cache
767 feed
= iface_cache
.get_feed(self
.uri
)
772 def _merge_attrs(attrs
, item
):
773 """Add each attribute of item to a copy of attrs and return the copy.
774 @type attrs: {str: str}
775 @type item: L{qdom.Element}
780 new
[str(a
)] = item
.attrs
[a
]
783 def _get_long(elem
, attr_name
):
784 val
= elem
.getAttribute(attr_name
)
789 raise SafeException(_("Invalid value for integer attribute '%(attribute_name)s': %(value)s") % {'attribute_name': attr_name
, 'value': val
})
792 class ZeroInstallFeed(object):
793 """A feed lists available implementations of an interface.
794 @ivar url: the URL for this feed
795 @ivar implementations: Implementations in this feed, indexed by ID
796 @type implementations: {str: L{Implementation}}
797 @ivar name: human-friendly name
798 @ivar summaries: short textual description (in various languages, since 0.49)
799 @type summaries: {str: str}
800 @ivar descriptions: long textual description (in various languages, since 0.49)
801 @type descriptions: {str: str}
802 @ivar last_modified: timestamp on signature
803 @ivar last_checked: time feed was last successfully downloaded and updated
804 @ivar feeds: list of <feed> elements in this feed
805 @type feeds: [L{Feed}]
806 @ivar feed_for: interfaces for which this could be a feed
807 @type feed_for: set(str)
808 @ivar metadata: extra elements we didn't understand
810 # _main is deprecated
811 __slots__
= ['url', 'implementations', 'name', 'descriptions', 'first_description', 'summaries', 'first_summary', '_package_implementations',
812 'last_checked', 'last_modified', 'feeds', 'feed_for', 'metadata']
814 def __init__(self
, feed_element
, local_path
= None, distro
= None):
815 """Create a feed object from a DOM.
816 @param feed_element: the root element of a feed file
817 @type feed_element: L{qdom.Element}
818 @param local_path: the pathname of this local feed, or None for remote feeds"""
819 self
.implementations
= {}
821 self
.summaries
= {} # { lang: str }
822 self
.first_summary
= None
823 self
.descriptions
= {} # { lang: str }
824 self
.first_description
= None
825 self
.last_modified
= None
827 self
.feed_for
= set()
829 self
.last_checked
= None
830 self
._package
_implementations
= []
832 if distro
is not None:
834 warnings
.warn("distro argument is now ignored", DeprecationWarning, 2)
836 if feed_element
is None:
837 return # XXX subclass?
839 assert feed_element
.name
in ('interface', 'feed'), "Root element should be <interface>, not %s" % feed_element
840 assert feed_element
.uri
== XMLNS_IFACE
, "Wrong namespace on root element: %s" % feed_element
.uri
842 main
= feed_element
.getAttribute('main')
843 #if main: warn("Setting 'main' on the root element is deprecated. Put it on a <group> instead")
846 self
.url
= local_path
847 local_dir
= os
.path
.dirname(local_path
)
849 self
.url
= feed_element
.getAttribute('uri')
851 raise InvalidInterface(_("<interface> uri attribute missing"))
852 local_dir
= None # Can't have relative paths
854 min_injector_version
= feed_element
.getAttribute('min-injector-version')
855 if min_injector_version
:
856 if parse_version(min_injector_version
) > parse_version(version
):
857 raise InvalidInterface(_("This feed requires version %(min_version)s or later of "
858 "Zero Install, but I am only version %(version)s. "
859 "You can get a newer version from http://0install.net") %
860 {'min_version': min_injector_version
, 'version': version
})
862 for x
in feed_element
.childNodes
:
863 if x
.uri
!= XMLNS_IFACE
:
864 self
.metadata
.append(x
)
867 self
.name
= x
.content
868 elif x
.name
== 'description':
869 if self
.first_description
== None:
870 self
.first_description
= x
.content
871 self
.descriptions
[x
.attrs
.get("http://www.w3.org/XML/1998/namespace lang", 'en')] = x
.content
872 elif x
.name
== 'summary':
873 if self
.first_summary
== None:
874 self
.first_summary
= x
.content
875 self
.summaries
[x
.attrs
.get("http://www.w3.org/XML/1998/namespace lang", 'en')] = x
.content
876 elif x
.name
== 'feed-for':
877 feed_iface
= x
.getAttribute('interface')
879 raise InvalidInterface(_('Missing "interface" attribute in <feed-for>'))
880 self
.feed_for
.add(feed_iface
)
881 # Bug report from a Debian/stable user that --feed gets the wrong value.
882 # Can't reproduce (even in a Debian/stable chroot), but add some logging here
883 # in case it happens again.
884 debug(_("Is feed-for %s"), feed_iface
)
885 elif x
.name
== 'feed':
886 feed_src
= x
.getAttribute('src')
888 raise InvalidInterface(_('Missing "src" attribute in <feed>'))
889 if feed_src
.startswith('http:') or feed_src
.startswith('https:') or local_path
:
890 langs
= x
.getAttribute('langs')
891 if langs
: langs
= langs
.replace('_', '-')
892 self
.feeds
.append(Feed(feed_src
, x
.getAttribute('arch'), False, langs
= langs
))
894 raise InvalidInterface(_("Invalid feed URL '%s'") % feed_src
)
896 self
.metadata
.append(x
)
899 raise InvalidInterface(_("Missing <name> in feed"))
901 raise InvalidInterface(_("Missing <summary> in feed"))
903 def process_group(group
, group_attrs
, base_depends
, base_bindings
, base_commands
):
904 for item
in group
.childNodes
:
905 if item
.uri
!= XMLNS_IFACE
: continue
907 if item
.name
not in ('group', 'implementation', 'package-implementation'):
910 # We've found a group or implementation. Scan for dependencies,
911 # bindings and commands. Doing this here means that:
912 # - We can share the code for groups and implementations here.
913 # - The order doesn't matter, because these get processed first.
914 # A side-effect is that the document root cannot contain
917 depends
= base_depends
[:]
918 bindings
= base_bindings
[:]
919 commands
= base_commands
.copy()
921 for attr
, command
in [('main', 'run'),
922 ('self-test', 'test')]:
923 value
= item
.attrs
.get(attr
, None)
924 if value
is not None:
925 commands
[command
] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'name': command
, 'path': value
}), None)
927 for child
in item
.childNodes
:
928 if child
.uri
!= XMLNS_IFACE
: continue
929 if child
.name
== 'requires':
930 dep
= process_depends(child
, local_dir
)
932 elif child
.name
== 'command':
933 command_name
= child
.attrs
.get('name', None)
935 raise InvalidInterface('Missing name for <command>')
936 commands
[command_name
] = Command(child
, local_dir
)
937 elif child
.name
in binding_names
:
938 bindings
.append(process_binding(child
))
940 compile_command
= item
.attrs
.get('http://zero-install.sourceforge.net/2006/namespaces/0compile command')
941 if compile_command
is not None:
942 commands
['compile'] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'name': 'compile', 'shell-command': compile_command
}), None)
944 item_attrs
= _merge_attrs(group_attrs
, item
)
946 if item
.name
== 'group':
947 process_group(item
, item_attrs
, depends
, bindings
, commands
)
948 elif item
.name
== 'implementation':
949 process_impl(item
, item_attrs
, depends
, bindings
, commands
)
950 elif item
.name
== 'package-implementation':
952 warn("A <package-implementation> with dependencies in %s!", self
.url
)
953 self
._package
_implementations
.append((item
, item_attrs
))
957 def process_impl(item
, item_attrs
, depends
, bindings
, commands
):
958 id = item
.getAttribute('id')
960 raise InvalidInterface(_("Missing 'id' attribute on %s") % item
)
961 local_path
= item_attrs
.get('local-path')
962 if local_dir
and local_path
:
963 abs_local_path
= os
.path
.abspath(os
.path
.join(local_dir
, local_path
))
964 impl
= ZeroInstallImplementation(self
, id, abs_local_path
)
965 elif local_dir
and (id.startswith('/') or id.startswith('.')):
967 id = os
.path
.abspath(os
.path
.join(local_dir
, id))
968 impl
= ZeroInstallImplementation(self
, id, id)
970 impl
= ZeroInstallImplementation(self
, id, None)
972 # In older feeds, the ID was the (single) digest
973 impl
.digests
.append(id)
974 if id in self
.implementations
:
975 warn(_("Duplicate ID '%(id)s' in feed '%(feed)s'"), {'id': id, 'feed': self
})
976 self
.implementations
[id] = impl
978 impl
.metadata
= item_attrs
980 version_mod
= item_attrs
.get('version-modifier', None)
982 item_attrs
['version'] += version_mod
983 del item_attrs
['version-modifier']
984 version
= item_attrs
['version']
986 raise InvalidInterface(_("Missing version attribute"))
987 impl
.version
= parse_version(version
)
989 impl
.commands
= commands
991 impl
.released
= item_attrs
.get('released', None)
992 impl
.langs
= item_attrs
.get('langs', '').replace('_', '-')
994 size
= item
.getAttribute('size')
996 impl
.size
= int(size
)
997 impl
.arch
= item_attrs
.get('arch', None)
999 stability
= stability_levels
[str(item_attrs
['stability'])]
1001 stab
= str(item_attrs
['stability'])
1002 if stab
!= stab
.lower():
1003 raise InvalidInterface(_('Stability "%s" invalid - use lower case!') % item_attrs
.stability
)
1004 raise InvalidInterface(_('Stability "%s" invalid') % item_attrs
['stability'])
1005 if stability
>= preferred
:
1006 raise InvalidInterface(_("Upstream can't set stability to preferred!"))
1007 impl
.upstream_stability
= stability
1009 impl
.bindings
= bindings
1010 impl
.requires
= depends
1012 for elem
in item
.childNodes
:
1013 if elem
.uri
!= XMLNS_IFACE
: continue
1014 if elem
.name
== 'archive':
1015 url
= elem
.getAttribute('href')
1017 raise InvalidInterface(_("Missing href attribute on <archive>"))
1018 size
= elem
.getAttribute('size')
1020 raise InvalidInterface(_("Missing size attribute on <archive>"))
1021 impl
.add_download_source(url
= url
, size
= int(size
),
1022 extract
= elem
.getAttribute('extract'),
1023 start_offset
= _get_long(elem
, 'start-offset'),
1024 type = elem
.getAttribute('type'))
1025 elif elem
.name
== 'manifest-digest':
1026 for aname
, avalue
in elem
.attrs
.iteritems():
1027 if ' ' not in aname
:
1028 impl
.digests
.append('%s=%s' % (aname
, avalue
))
1029 elif elem
.name
== 'recipe':
1031 for recipe_step
in elem
.childNodes
:
1032 if recipe_step
.uri
== XMLNS_IFACE
and recipe_step
.name
== 'archive':
1033 url
= recipe_step
.getAttribute('href')
1035 raise InvalidInterface(_("Missing href attribute on <archive>"))
1036 size
= recipe_step
.getAttribute('size')
1038 raise InvalidInterface(_("Missing size attribute on <archive>"))
1039 recipe
.steps
.append(DownloadSource(None, url
= url
, size
= int(size
),
1040 extract
= recipe_step
.getAttribute('extract'),
1041 start_offset
= _get_long(recipe_step
, 'start-offset'),
1042 type = recipe_step
.getAttribute('type')))
1044 info(_("Unknown step '%s' in recipe; skipping recipe"), recipe_step
.name
)
1047 impl
.download_sources
.append(recipe
)
1049 root_attrs
= {'stability': 'testing'}
1052 info("Note: @main on document element is deprecated in %s", self
)
1053 root_commands
['run'] = Command(qdom
.Element(XMLNS_IFACE
, 'command', {'path': main
}), None)
1054 process_group(feed_element
, root_attrs
, [], [], root_commands
)
1056 def get_distro_feed(self
):
1057 """Does this feed contain any <pacakge-implementation> elements?
1058 i.e. is it worth asking the package manager for more information?
1059 @return: the URL of the virtual feed, or None
1061 if self
._package
_implementations
:
1062 return "distribution:" + self
.url
1065 def get_package_impls(self
, distro
):
1066 """Find the best <pacakge-implementation> element(s) for the given distribution.
1067 @param distro: the distribution to use to rate them
1068 @type distro: L{distro.Distribution}
1069 @return: a list of tuples for the best ranked elements
1075 for item
, item_attrs
in self
._package
_implementations
:
1076 distro_names
= item_attrs
.get('distributions', '')
1077 for distro_name
in distro_names
.split(' '):
1078 score
= distro
.get_score(distro_name
)
1079 if score
> best_score
:
1082 if score
== best_score
:
1083 best_impls
.append((item
, item_attrs
))
1087 return self
.name
or '(' + os
.path
.basename(self
.url
) + ')'
1090 return _("<Feed %s>") % self
.url
1092 def set_stability_policy(self
, new
):
1093 assert new
is None or isinstance(new
, Stability
)
1094 self
.stability_policy
= new
1096 def get_feed(self
, url
):
1097 for x
in self
.feeds
:
1102 def add_metadata(self
, elem
):
1103 self
.metadata
.append(elem
)
1105 def get_metadata(self
, uri
, name
):
1106 """Return a list of interface metadata elements with this name and namespace URI."""
1107 return [m
for m
in self
.metadata
if m
.name
== name
and m
.uri
== uri
]
1111 return _best_language_match(self
.summaries
) or self
.first_summary
1114 def description(self
):
1115 return _best_language_match(self
.descriptions
) or self
.first_description
1117 class DummyFeed(object):
1118 """Temporary class used during API transition."""
1119 last_modified
= None
1121 last_checked
= property(lambda self
: None)
1122 implementations
= property(lambda self
: {})
1123 feeds
= property(lambda self
: [])
1124 summary
= property(lambda self
: '-')
1125 description
= property(lambda self
: '')
1126 def get_name(self
): return self
.name
1127 def get_feed(self
, url
): return None
1128 def get_metadata(self
, uri
, name
): return []
1129 _dummy_feed
= DummyFeed()
1132 """Convert each %20 to a space, etc.
1134 uri
= uri
.replace('#', '/')
1135 if '%' not in uri
: return uri
1136 return re
.sub('%[0-9a-fA-F][0-9a-fA-F]',
1137 lambda match
: chr(int(match
.group(0)[1:], 16)),
1138 uri
).decode('utf-8')
1141 """Convert each space to %20, etc
1143 return re
.sub('[^-_.a-zA-Z0-9]',
1144 lambda match
: '%%%02x' % ord(match
.group(0)),
1145 uri
.encode('utf-8'))
1147 def _pretty_escape(uri
):
1148 """Convert each space to %20, etc
1149 : is preserved and / becomes #. This makes for nicer strings,
1150 and may replace L{escape} everywhere in future.
1152 if os
.name
== "posix":
1153 # Only preserve : on Posix systems
1154 preserveRegex
= '[^-_.a-zA-Z0-9:/]'
1156 # Other OSes may not allow the : character in file names
1157 preserveRegex
= '[^-_.a-zA-Z0-9/]'
1158 return re
.sub(preserveRegex
,
1159 lambda match
: '%%%02x' % ord(match
.group(0)),
1160 uri
.encode('utf-8')).replace('/', '#')
1162 def canonical_iface_uri(uri
):
1163 """If uri is a relative path, convert to an absolute one.
1164 A "file:///foo" URI is converted to "/foo".
1165 An "alias:prog" URI expands to the URI in the 0alias script
1166 Otherwise, return it unmodified.
1168 @raise SafeException: if uri isn't valid
1170 if uri
.startswith('http://') or uri
.startswith('https://'):
1171 if uri
.count("/") < 3:
1172 raise SafeException(_("Missing / after hostname in URI '%s'") % uri
)
1174 elif uri
.startswith('file:///'):
1176 elif uri
.startswith('alias:'):
1177 from zeroinstall
import alias
, support
1178 alias_prog
= uri
[6:]
1179 if not os
.path
.isabs(alias_prog
):
1180 full_path
= support
.find_in_path(alias_prog
)
1182 raise alias
.NotAnAliasScript("Not found in $PATH: " + alias_prog
)
1184 full_path
= alias_prog
1185 interface_uri
, main
= alias
.parse_script(full_path
)
1186 return interface_uri
1188 iface_uri
= os
.path
.realpath(uri
)
1189 if os
.path
.isfile(iface_uri
):
1191 raise SafeException(_("Bad interface name '%(uri)s'.\n"
1192 "(doesn't start with 'http:', and "
1193 "doesn't exist as a local file '%(interface_uri)s' either)") %
1194 {'uri': uri
, 'interface_uri': iface_uri
})
1196 _version_mod_to_value
= {
1204 _version_value_to_mod
= {}
1205 for x
in _version_mod_to_value
: _version_value_to_mod
[_version_mod_to_value
[x
]] = x
1208 _version_re
= re
.compile('-([a-z]*)')
1210 def parse_version(version_string
):
1211 """Convert a version string to an internal representation.
1212 The parsed format can be compared quickly using the standard Python functions.
1213 - Version := DottedList ("-" Mod DottedList?)*
1214 - DottedList := (Integer ("." Integer)*)
1215 @rtype: tuple (opaque)
1216 @raise SafeException: if the string isn't a valid version
1217 @since: 0.24 (moved from L{reader}, from where it is still available):"""
1218 if version_string
is None: return None
1219 parts
= _version_re
.split(version_string
)
1221 del parts
[-1] # Ends with a modifier
1225 raise SafeException(_("Empty version string!"))
1228 for x
in range(0, l
, 2):
1231 parts
[x
] = map(int, parts
[x
].split('.'))
1233 parts
[x
] = [] # (because ''.split('.') == [''], not [])
1234 for x
in range(1, l
, 2):
1235 parts
[x
] = _version_mod_to_value
[parts
[x
]]
1237 except ValueError as ex
:
1238 raise SafeException(_("Invalid version format in '%(version_string)s': %(exception)s") % {'version_string': version_string
, 'exception': ex
})
1239 except KeyError as ex
:
1240 raise SafeException(_("Invalid version modifier in '%(version_string)s': %(exception)s") % {'version_string': version_string
, 'exception': ex
})
1242 def format_version(version
):
1243 """Format a parsed version for display. Undoes the effect of L{parse_version}.
1244 @see: L{Implementation.get_version}
1247 version
= version
[:]
1249 for x
in range(0, l
, 2):
1250 version
[x
] = '.'.join(map(str, version
[x
]))
1251 for x
in range(1, l
, 2):
1252 version
[x
] = '-' + _version_value_to_mod
[version
[x
]]
1253 if version
[-1] == '-': del version
[-1]
1254 return ''.join(version
)