Add vardbapi.aux_get() support for an "_mtime_" value which corresponds to

the installed package directory's mtime (numeric value from stat result).
This value can be used to validate indexes or caches used in the optimization
of vdb query operations for various types of package metadata such as
dependencies and file contents.

svn path=/main/trunk/; revision=10586

1 files changed, 19 insertions, 11 deletions

diff --git a/pym/portage/dbapi/vartree.py b/pym/portage/dbapi/vartree.py
index d931c5dd..cb2fe28b 100644
--- a/pym/portage/dbapi/vartree.py
+++ b/pym/portage/dbapi/vartree.py
@@ -632,7 +632,7 @@ class vardbapi(dbapi):
 		mydir_mtime = long(mydir_stat.st_mtime)
 		pkg_data = self._aux_cache["packages"].get(mycpv)
 		pull_me = cache_these.union(wants)
-		mydata = {}
+		mydata = {"_mtime_" : mydir_mtime}
 		cache_valid = False
 		cache_incomplete = False
 		cache_mtime = None
@@ -656,7 +656,8 @@ class vardbapi(dbapi):
 		if pull_me:
 			# pull any needed data and cache it
 			aux_keys = list(pull_me)
-			for k, v in izip(aux_keys, self._aux_get(mycpv, aux_keys)):
+			for k, v in izip(aux_keys,
+				self._aux_get(mycpv, aux_keys, st=mydir_stat)):
 				mydata[k] = v
 			if not cache_valid or cache_these.difference(metadata):
 				cache_data = {}
@@ -668,18 +669,25 @@ class vardbapi(dbapi):
 				self._aux_cache["modified"].add(mycpv)
 		return [mydata[x] for x in wants]
 
-	def _aux_get(self, mycpv, wants):
+	def _aux_get(self, mycpv, wants, st=None):
 		mydir = self.getpath(mycpv)
-		try:
-			if not stat.S_ISDIR(os.stat(mydir).st_mode):
-				raise KeyError(mycpv)
-		except OSError, e:
-			if e.errno == errno.ENOENT:
-				raise KeyError(mycpv)
-			del e
-			raise
+		if st is None:
+			try:
+				st = os.stat(mydir)
+			except OSError, e:
+				if e.errno == errno.ENOENT:
+					raise KeyError(mycpv)
+				elif e.errno == PermissionDenied.errno:
+					raise PermissionDenied(mydir)
+				else:
+					raise
+		if not stat.S_ISDIR(st.st_mode):
+			raise KeyError(mycpv)
 		results = []
 		for x in wants:
+			if x == "_mtime_":
+				results.append(st.st_mtime)
+				continue
 			try:
 				myf = open(os.path.join(mydir, x), "r")
 				try: