From 3b08c21101b0801d7c5d6c145a27bef5cd42078c Mon Sep 17 00:00:00 2001
From: Marius Mauch <genone@gentoo.org>
Date: Thu, 25 Jan 2007 15:49:26 +0000
Subject: Namespace sanitizing, step 1

svn path=/main/trunk/; revision=5778
---
 pym/portage/eclass_cache.py | 83 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 pym/portage/eclass_cache.py

(limited to 'pym/portage/eclass_cache.py')

diff --git a/pym/portage/eclass_cache.py b/pym/portage/eclass_cache.py
new file mode 100644
index 000000000..91b98fec5
--- /dev/null
+++ b/pym/portage/eclass_cache.py
@@ -0,0 +1,83 @@
+# Copyright: 2005 Gentoo Foundation
+# Author(s): Nicholas Carpaski (carpaski@gentoo.org), Brian Harring (ferringb@gentoo.org)
+# License: GPL2
+# $Id$
+
+from portage_util import normalize_path, writemsg
+import os, sys
+from portage_data import portage_gid
+
+class cache:
+	"""
+	Maintains the cache information about eclasses used in ebuild.
+	"""
+	def __init__(self, porttree_root, overlays=[]):
+		self.porttree_root = porttree_root
+
+		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
+		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()
+
+	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 = {}
+		eclass_len = len(".eclass")
+		for x in [normalize_path(os.path.join(y,"eclass")) for y in self.porttrees]:
+			if not os.path.isdir(x):
+				continue
+			for y in [y for y in os.listdir(x) if y.endswith(".eclass")]:
+				try:
+					mtime = long(os.stat(os.path.join(x, y)).st_mtime)
+				except OSError:
+					continue
+				ys=y[:-eclass_len]
+				self.eclasses[ys] = (x, long(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:
+			try:
+				ec_dict[x] = self.eclasses[x]
+			except KeyError:
+				print "ec=",ec_dict
+				print "inherits=",inherits
+				raise
+			if from_master_only and \
+				self._eclass_locations[x] != self._master_eclass_root:
+				return None
+
+		return ec_dict
-- 
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