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# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import sys
import portage
from portage import os
from _emerge.Package import Package
from _emerge.PackageVirtualDbapi import PackageVirtualDbapi
from portage.const import VDB_PATH
from portage.dbapi.vartree import vartree
from portage.update import grab_updates, parse_updates, update_dbentries
if sys.hexversion >= 0x3000000:
long = int
class FakeVardbapi(PackageVirtualDbapi):
"""
Implements the vardbapi.getpath() method which is used in error handling
code for the Package class and vartree.get_provide().
"""
def getpath(self, cpv, filename=None):
path = os.path.join(self.settings['EROOT'], VDB_PATH, cpv)
if filename is not None:
path =os.path.join(path, filename)
return path
class FakeVartree(vartree):
"""This is implements an in-memory copy of a vartree instance that provides
all the interfaces required for use by the depgraph. The vardb is locked
during the constructor call just long enough to read a copy of the
installed package information. This allows the depgraph to do it's
dependency calculations without holding a lock on the vardb. It also
allows things like vardb global updates to be done in memory so that the
user doesn't necessarily need write access to the vardb in cases where
global updates are necessary (updates are performed when necessary if there
is not a matching ebuild in the tree). Instances of this class are not
populated until the sync() method is called."""
def __init__(self, root_config, pkg_cache=None, pkg_root_config=None):
self._root_config = root_config
if pkg_root_config is None:
pkg_root_config = self._root_config
self._pkg_root_config = pkg_root_config
if pkg_cache is None:
pkg_cache = {}
real_vartree = root_config.trees["vartree"]
self._real_vardb = real_vartree.dbapi
portdb = root_config.trees["porttree"].dbapi
self.root = real_vartree.root
self.settings = real_vartree.settings
mykeys = list(real_vartree.dbapi._aux_cache_keys)
if "_mtime_" not in mykeys:
mykeys.append("_mtime_")
self._db_keys = mykeys
self._pkg_cache = pkg_cache
self.dbapi = FakeVardbapi(real_vartree.settings)
# Initialize variables needed for lazy cache pulls of the live ebuild
# metadata. This ensures that the vardb lock is released ASAP, without
# being delayed in case cache generation is triggered.
self._aux_get = self.dbapi.aux_get
self.dbapi.aux_get = self._aux_get_wrapper
self._match = self.dbapi.match
self.dbapi.match = self._match_wrapper
self._aux_get_history = set()
self._portdb_keys = ["EAPI", "DEPEND", "RDEPEND", "PDEPEND"]
self._portdb = portdb
self._global_updates = None
def _match_wrapper(self, cpv, use_cache=1):
"""
Make sure the metadata in Package instances gets updated for any
cpv that is returned from a match() call, since the metadata can
be accessed directly from the Package instance instead of via
aux_get().
"""
matches = self._match(cpv, use_cache=use_cache)
for cpv in matches:
if cpv in self._aux_get_history:
continue
self._aux_get_wrapper(cpv, [])
return matches
def _aux_get_wrapper(self, pkg, wants):
if pkg in self._aux_get_history:
return self._aux_get(pkg, wants)
self._aux_get_history.add(pkg)
try:
# Use the live ebuild metadata if possible.
live_metadata = dict(zip(self._portdb_keys,
self._portdb.aux_get(pkg, self._portdb_keys)))
if not portage.eapi_is_supported(live_metadata["EAPI"]):
raise KeyError(pkg)
self.dbapi.aux_update(pkg, live_metadata)
except (KeyError, portage.exception.PortageException):
if self._global_updates is None:
self._global_updates = \
grab_global_updates(self._portdb)
perform_global_updates(
pkg, self.dbapi, self._global_updates)
return self._aux_get(pkg, wants)
def cpv_discard(self, pkg):
"""
Discard a package from the fake vardb if it exists.
"""
old_pkg = self.dbapi.get(pkg)
if old_pkg is not None:
self.dbapi.cpv_remove(old_pkg)
self._pkg_cache.pop(old_pkg, None)
self._aux_get_history.discard(old_pkg.cpv)
def sync(self, acquire_lock=1):
"""
Call this method to synchronize state with the real vardb
after one or more packages may have been installed or
uninstalled.
"""
locked = False
try:
if acquire_lock and os.access(self._real_vardb._dbroot, os.W_OK):
self._real_vardb.lock()
locked = True
self._sync()
finally:
if locked:
self._real_vardb.unlock()
# Populate the old-style virtuals using the cached values.
# Skip the aux_get wrapper here, to avoid unwanted
# cache generation.
try:
self.dbapi.aux_get = self._aux_get
self.settings._populate_treeVirtuals_if_needed(self)
finally:
self.dbapi.aux_get = self._aux_get_wrapper
def _sync(self):
real_vardb = self._root_config.trees["vartree"].dbapi
current_cpv_set = frozenset(real_vardb.cpv_all())
pkg_vardb = self.dbapi
pkg_cache = self._pkg_cache
aux_get_history = self._aux_get_history
# Remove any packages that have been uninstalled.
for pkg in list(pkg_vardb):
if pkg.cpv not in current_cpv_set:
self.cpv_discard(pkg)
# Validate counters and timestamps.
slot_counters = {}
root = self.root
validation_keys = ["COUNTER", "_mtime_"]
for cpv in current_cpv_set:
pkg_hash_key = ("installed", root, cpv, "nomerge")
pkg = pkg_vardb.get(pkg_hash_key)
if pkg is not None:
counter, mtime = real_vardb.aux_get(cpv, validation_keys)
try:
counter = long(counter)
except ValueError:
counter = 0
if counter != pkg.counter or \
mtime != pkg.mtime:
self.cpv_discard(pkg)
pkg = None
if pkg is None:
pkg = self._pkg(cpv)
other_counter = slot_counters.get(pkg.slot_atom)
if other_counter is not None:
if other_counter > pkg.counter:
continue
slot_counters[pkg.slot_atom] = pkg.counter
pkg_vardb.cpv_inject(pkg)
real_vardb.flush_cache()
def _pkg(self, cpv):
"""
The RootConfig instance that will become the Package.root_config
attribute can be overridden by the FakeVartree pkg_root_config
constructory argument, since we want to be consistent with the
depgraph._pkg() method which uses a specially optimized
RootConfig that has a FakeVartree instead of a real vartree.
"""
pkg = Package(cpv=cpv, built=True, installed=True,
metadata=zip(self._db_keys,
self._real_vardb.aux_get(cpv, self._db_keys)),
root_config=self._pkg_root_config,
type_name="installed")
try:
mycounter = long(pkg.metadata["COUNTER"])
except ValueError:
mycounter = 0
pkg.metadata["COUNTER"] = str(mycounter)
self._pkg_cache[pkg] = pkg
return pkg
def grab_global_updates(portdb):
retupdates = {}
for repo_name in portdb.getRepositories():
repo = portdb.getRepositoryPath(repo_name)
updpath = os.path.join(repo, "profiles", "updates")
if not os.path.isdir(updpath):
continue
try:
rawupdates = grab_updates(updpath)
except portage.exception.DirectoryNotFound:
rawupdates = []
upd_commands = []
for mykey, mystat, mycontent in rawupdates:
commands, errors = parse_updates(mycontent)
upd_commands.extend(commands)
retupdates[repo_name] = upd_commands
master_repo = portdb.getRepositoryName(portdb.porttree_root)
if master_repo in retupdates:
retupdates['DEFAULT'] = retupdates[master_repo]
return retupdates
def perform_global_updates(mycpv, mydb, myupdates):
aux_keys = ["DEPEND", "RDEPEND", "PDEPEND", 'repository']
aux_dict = dict(zip(aux_keys, mydb.aux_get(mycpv, aux_keys)))
repository = aux_dict.pop('repository')
try:
mycommands = myupdates[repository]
except KeyError:
try:
mycommands = myupdates['DEFAULT']
except KeyError:
return
if not mycommands:
return
updates = update_dbentries(mycommands, aux_dict)
if updates:
mydb.aux_update(mycpv, updates)
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