def get_release(self, requirements, prefer_final=None):
"""Return only one release that fulfill the given requirements"""
predicate = get_version_predicate(requirements)
release = self.get_releases(predicate, prefer_final)\
.get_last(predicate)
if not release:
raise ReleaseNotFound("No release matches the given criterias")
return release
def get_release(self, requirements, prefer_final=False):
"""Return a release with all complete metadata and distribution
related informations.
"""
prefer_final = self._get_prefer_final(prefer_final)
predicate = get_version_predicate(requirements)
releases = self.get_releases(predicate.name)
release = releases.get_last(predicate, prefer_final)
self.get_metadata(release.name, str(release.version))
self.get_distributions(release.name, str(release.version))
return release
def get_last(self, requirements, prefer_final=None):
"""Return the "last" release, that satisfy the given predicates.
"last" is defined by the version number of the releases, you also could
set prefer_final parameter to True or False to change the order results
"""
predicate = get_version_predicate(requirements)
releases = self.filter(predicate)
if len(releases) == 0:
return None
releases.sort_releases(prefer_final, reverse=True)
return releases[0]
def get_releases(self, requirements, prefer_final=None, show_hidden=True,
force_update=False):
"""Return the list of existing releases for a specific project.
Cache the results from one call to another.
If show_hidden is True, return the hidden releases too.
If force_update is True, reprocess the index to update the
informations (eg. make a new XML-RPC call).
::
>>> client = Client()
>>> client.get_releases('Foo')
['1.1', '1.2', '1.3']
If no such project exists, raise a ProjectNotFound exception::
>>> client.get_project_versions('UnexistingProject')
ProjectNotFound: UnexistingProject
"""
def get_versions(project_name, show_hidden):
return self.proxy.package_releases(project_name, show_hidden)
predicate = get_version_predicate(requirements)
prefer_final = self._get_prefer_final(prefer_final)
project_name = predicate.name
if not force_update and (project_name.lower() in self._projects):
project = self._projects[project_name.lower()]
if not project.contains_hidden and show_hidden:
# if hidden releases are requested, and have an existing
# list of releases that does not contains hidden ones
all_versions = get_versions(project_name, show_hidden)
existing_versions = project.get_versions()
hidden_versions = set(all_versions) - set(existing_versions)
for version in hidden_versions:
project.add_release(release=ReleaseInfo(project_name,
version, index=self._index))
else:
versions = get_versions(project_name, show_hidden)
if not versions:
raise ProjectNotFound(project_name)
project = self._get_project(project_name)
project.add_releases([ReleaseInfo(project_name, version,
index=self._index)
for version in versions])
project = project.filter(predicate)
if len(project) == 0:
raise ReleaseNotFound("%s" % predicate)
project.sort_releases(prefer_final)
return project
def get_releases(self, requirements, prefer_final=None,
force_update=False):
"""Search for releases and return a ReleasesList object containing
the results.
"""
predicate = get_version_predicate(requirements)
if predicate.name.lower() in self._projects and not force_update:
return self._projects.get(predicate.name.lower())
prefer_final = self._get_prefer_final(prefer_final)
logger.debug('Reading info on PyPI about %s', predicate.name)
self._process_index_page(predicate.name)
if predicate.name.lower() not in self._projects:
raise ProjectNotFound
releases = self._projects.get(predicate.name.lower())
releases.sort_releases(prefer_final=prefer_final)
return releases
def get_infos(requirements, index=None, installed=None, prefer_final=True):
"""Return the informations on what's going to be installed and upgraded.
:param requirements: is a *string* containing the requirements for this
project (for instance "FooBar 1.1" or "BarBaz (<1.2)")
:param index: If an index is specified, use this one, otherwise, use
:class index.ClientWrapper: to get project metadatas.
:param installed: a list of already installed distributions.
:param prefer_final: when picking up the releases, prefer a "final" one
over a beta/alpha/etc one.
The results are returned in a dict, containing all the operations
needed to install the given requirements::
>>> get_install_info("FooBar (<=1.2)")
{'install': [<FooBar 1.1>], 'remove': [], 'conflict': []}
Conflict contains all the conflicting distributions, if there is a
conflict.
"""
# this function does several things:
# 1. get a release specified by the requirements
# 2. gather its metadata, using setuptools compatibility if needed
# 3. compare this tree with what is currently installed on the system,
# return the requirements of what is missing
# 4. do that recursively and merge back the results
# 5. return a dict containing information about what is needed to install
# or remove
if not installed:
logger.debug('Reading installed distributions')
installed = list(get_distributions(use_egg_info=True))
infos = {'install': [], 'remove': [], 'conflict': []}
# Is a compatible version of the project already installed ?
predicate = get_version_predicate(requirements)
found = False
# check that the project isn't already installed
for installed_project in installed:
# is it a compatible project ?
if predicate.name.lower() != installed_project.name.lower():
continue
found = True
logger.info('Found %r %s', installed_project.name,
installed_project.version)
# if we already have something installed, check it matches the
# requirements
if predicate.match(installed_project.version):
return infos
break
if not found:
logger.debug('Project not installed')
if not index:
index = wrapper.ClientWrapper()
if not installed:
installed = get_distributions(use_egg_info=True)
# Get all the releases that match the requirements
try:
release = index.get_release(requirements)
except (ReleaseNotFound, ProjectNotFound):
raise InstallationException('Release not found: %r' % requirements)
if release is None:
logger.info('Could not find a matching project')
return infos
metadata = release.fetch_metadata()
# we need to build setuptools deps if any
if 'requires_dist' not in metadata:
metadata['requires_dist'] = _get_setuptools_deps(release)
# build the dependency graph with local and required dependencies
dists = list(installed)
dists.append(release)
depgraph = generate_graph(dists)
# Get what the missing deps are
dists = depgraph.missing[release]
if dists:
logger.info("Missing dependencies found, retrieving metadata")
# we have missing deps
for dist in dists:
_update_infos(infos, get_infos(dist, index, installed))
# Fill in the infos
existing = [d for d in installed if d.name == release.name]
if existing:
infos['remove'].append(existing[0])
infos['conflict'].extend(depgraph.reverse_list[existing[0]])
infos['install'].append(release)
return infos
