def _extract_egg_args(args): eggs, reqs = [], [] for arg in args: if os.path.exists(arg) and os.path.splitext(arg)[1] == '.egg': eggs.append(arg) reqs.append(str(egg_distribution(arg).as_requirement())) else: reqs.append(arg) return eggs, reqs
def install(cmd, reqs, add_to_global=False, prefer_final=True, force_upgrade=False, use_existing=False, eggs=None, reinstall=False): """ Installs a given requirement using buildout's modified easy_install. Parameters ---------- cmd : `setuptools.Command` active setuptools Command class reqs : `list` of `str` list of distutils requirements, eg ['foo==1.2'] eggs : `list` of `str` paths to egg files to use to satisfy requirements add_to_global : `bool` adds installed distribution to the global working_set. This has the effect of making them available for import within this process, used by fetch_build_eggs. prefer_final : `bool` Will prefer released versions of the requirements over dev versions, unless the package is third-party where it always prefers final versions. force_upgrade : `bool` Will force downloads of requirements from PyPI. This is the rough equivalent of ``easy_install -U acme.foo`` use_existing : `bool` Will not update any packages found in the current working set reinstall : `bool` Will reinstall packages that are already installed. Returns ------- ws : `pkg_resources.WorkingSet` Working Set for the distributions that were just installed. """ # Remove anything we're upgrading if force_upgrade: uninstall_eggs(reqs) # Create installer class configured to install into wherever the command # class was setup for installer = Installer(dest=cmd.install_dir, index=cmd.index_url, prefer_final=prefer_final) egg_dists = [egg_distribution(egg) for egg in (eggs or [])] installer._egg_dists = egg_dists # This is a bit nasty - we have to monkey-patch the filter for final # versions so that we can also filter for dev versions as well. # Set prefer_final to True, always, so it enables the filter easy_install.prefer_final(True) # This returns a WorkingSet of the packages we just installed. # NOTE here we pass in the existing stuff - this will prefer installed # packages over ones on the server, eg an installed release # version won't get trumped by a dev version on the server ws = pkg_resources.WorkingSet(pkg_resources.working_set.entries) # We must remove the package we're installing from the 'baseline' ws. # This way we won't get any weird requirement conflicts with new # versions of the package we're trying to set up if cmd.distribution.metadata.name: dist = dependency.get_dist(cmd.distribution.metadata.name) if dist: dependency.remove_from_ws(ws, dist) # There's a chance that there were packages in setup_requires that were # also in install_requires. All packages that were not in the original # environment and were installed during the `setup_requires` resolution # process are tracked by `fetched_setup_requires` field of # `pkglib.setuptools.dist.Distribution`. # Here we ensure that they're re-added for setup along with any of their # own dependencies if they are also part of the package install_requires. for d in getattr(cmd.distribution, "fetched_setup_requires", []): dependency.remove_from_ws(ws, d) # Now run the installer to_setup = installer.install(reqs, working_set=ws, use_existing=use_existing, force_upgrade=force_upgrade, reinstall=reinstall) return setup_dists(cmd, ws, to_setup, egg_dists, add_to_global=add_to_global)