Commit 58d44373 authored by Peter Uittenbroek's avatar Peter Uittenbroek

Introduce improved easy_install.py Install.install function. Originally...

Introduce improved easy_install.py Install.install function. Originally commited in 98b7c55c
parent b208fe6f
......@@ -609,9 +609,9 @@ class Installer:
logger.debug('Installing %s.', repr(specs)[1:-1])
path = self._path
dest = self._dest
if dest is not None and dest not in path:
path.insert(0, dest)
destination = self._dest
if destination is not None and destination not in path:
path.insert(0, destination)
requirements = [self._constrain(pkg_resources.Requirement.parse(spec))
for spec in specs]
......@@ -629,35 +629,51 @@ class Installer:
self._maybe_add_setuptools(ws, dist)
# OK, we have the requested distributions and they're in the working
# set, but they may have unmet requirements. We'll simply keep
# trying to resolve requirements, adding missing requirements as they
# are reported.
#
# Note that we don't pass in the environment, because we want
# set, but they may have unmet requirements. We'll resolve these
# requirements. This is code modified from
# pkg_resources.WorkingSet.resolve. We can't reuse that code directly
# because we have to constrain our requirements (see
# versions_section_ignored_for_dependency_in_favor_of_site_packages in
# zc.buildout.tests).
requirements.reverse() # Set up the stack.
processed = {} # This is a set of processed requirements.
best = {} # This is a mapping of key -> dist.
# Note that we don't use the existing environment, because we want
# to look for new eggs unless what we have is the best that
# matches the requirement.
while 1:
try:
ws.resolve(requirements)
except pkg_resources.DistributionNotFound:
err = sys.exc_info()[1]
[requirement] = err.args
requirement = self._constrain(requirement)
if dest:
logger.debug('Getting required %r', str(requirement))
else:
logger.debug('Adding required %r', str(requirement))
_log_requirement(ws, requirement)
for dist in self._get_dist(requirement, ws):
ws.add(dist)
self._maybe_add_setuptools(ws, dist)
except pkg_resources.VersionConflict:
err = sys.exc_info()[1]
raise VersionConflict(err, ws)
else:
break
env = pkg_resources.Environment(ws.entries)
while requirements:
# Process dependencies breadth-first.
req = self._constrain(requirements.pop(0))
if req in processed:
# Ignore cyclic or redundant dependencies.
continue
dist = best.get(req.key)
if dist is None:
# Find the best distribution and add it to the map.
dist = ws.by_key.get(req.key)
if dist is None:
try:
dist = best[req.key] = env.best_match(req, ws)
except pkg_resources.VersionConflict, err:
raise VersionConflict(err, ws)
if dist is None:
if destination:
logger.debug('Getting required %r', str(req))
else:
logger.debug('Adding required %r', str(req))
_log_requirement(ws, req)
for dist in self._get_dist(req, ws,):
ws.add(dist)
self._maybe_add_setuptools(ws, dist)
if dist not in req:
# Oops, the "best" so far conflicts with a dependency.
raise VersionConflict(
pkg_resources.VersionConflict(dist, req), ws)
requirements.extend(dist.requires(req.extras)[::-1])
processed[req] = True
# if dist.location in self._site_packages:
# logger.debug('Egg from site-packages: %s', dist)
return ws
def build(self, spec, build_ext):
......
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