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# Copyright: 2005 Gentoo Foundation
# Author(s): Nicholas Carpaski (carpaski@gentoo.org), Brian Harring (ferringb@gentoo.org)
# License: GPL2
# $Id$
__all__ = ["cache"]
import warnings
from portage.util import normalize_path, writemsg
import errno, os, sys
from portage.data import portage_gid
from portage.exception import PermissionDenied
class cache(object):
"""
Maintains the cache information about eclasses used in ebuild.
"""
def __init__(self, porttree_root, overlays=[]):
self.eclasses = {} # {"Name": ("location","_mtime_")}
self._eclass_locations = {}
# screw with the porttree ordering, w/out having bash inherit match it, and I'll hurt you.
# ~harring
if porttree_root:
self.porttree_root = porttree_root
self.porttrees = [self.porttree_root] + overlays
self.porttrees = tuple(map(normalize_path, self.porttrees))
self._master_eclass_root = os.path.join(self.porttrees[0], "eclass")
self.update_eclasses()
else:
self.porttree_root = None
self.porttrees = ()
self._master_eclass_root = None
def copy(self):
return self.__copy__()
def __copy__(self):
result = self.__class__(None)
result.eclasses = self.eclasses.copy()
result._eclass_locations = self._eclass_locations.copy()
result.porttree_root = self.porttree_root
result.porttrees = self.porttrees
result._master_eclass_root = self._master_eclass_root
return result
def append(self, other):
"""
Append another instance to this instance. This will cause eclasses
from the other instance to override any eclasses from this instance
that have the same name.
"""
if not isinstance(other, self.__class__):
raise TypeError(
"expected type %s, got %s" % (self.__class__, type(other)))
self.porttrees = self.porttrees + other.porttrees
self.eclasses.update(other.eclasses)
self._eclass_locations.update(other._eclass_locations)
def close_caches(self):
import traceback
traceback.print_stack()
print "%s close_cache is deprecated" % self.__class__
self.eclasses.clear()
def flush_cache(self):
import traceback
traceback.print_stack()
print "%s flush_cache is deprecated" % self.__class__
self.update_eclasses()
def update_eclasses(self):
self.eclasses = {}
self._eclass_locations = {}
master_eclasses = {}
eclass_len = len(".eclass")
ignored_listdir_errnos = (errno.ENOENT, errno.ENOTDIR)
for x in [normalize_path(os.path.join(y,"eclass")) for y in self.porttrees]:
try:
eclass_filenames = os.listdir(x)
except OSError, e:
if e.errno in ignored_listdir_errnos:
del e
continue
elif e.errno == PermissionDenied.errno:
raise PermissionDenied(x)
raise
for y in eclass_filenames:
if not y.endswith(".eclass"):
continue
try:
mtime = long(os.stat(os.path.join(x, y)).st_mtime)
except OSError:
continue
ys=y[:-eclass_len]
if x == self._master_eclass_root:
master_eclasses[ys] = mtime
self.eclasses[ys] = (x, mtime)
self._eclass_locations[ys] = x
continue
master_mtime = master_eclasses.get(ys)
if master_mtime is not None:
if master_mtime == mtime:
# It appears to be identical to the master,
# so prefer the master entry.
continue
self.eclasses[ys] = (x, mtime)
self._eclass_locations[ys] = x
def is_eclass_data_valid(self, ec_dict):
if not isinstance(ec_dict, dict):
return False
for eclass, tup in ec_dict.iteritems():
cached_data = self.eclasses.get(eclass, None)
""" Only use the mtime for validation since the probability of a
collision is small and, depending on the cache implementation, the
path may not be specified (cache from rsync mirrors, for example).
"""
if cached_data is None or tup[1] != cached_data[1]:
return False
return True
def get_eclass_data(self, inherits, from_master_only=False):
ec_dict = {}
for x in inherits:
ec_dict[x] = self.eclasses[x]
if from_master_only is not False:
warnings.warn("portage.eclass_cache.cache.get_eclass_data(): " + \
"ignoring deprecated 'from_master_only' parameter",
DeprecationWarning)
return ec_dict
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