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# Copyright 2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id: /var/cvsroot/gentoo-src/portage/pym/Attic/portage_db_flat.py,v 1.13.2.6 2005/04/19 07:14:17 ferringb Exp $
cvs_id_string="$Id: portage_db_flat.py,v 1.13.2.6 2005/04/19 07:14:17 ferringb Exp $"[5:-2]
import types
import os
import stat
import portage_db_template
class database(portage_db_template.database):
def module_init(self):
self.lastkey = None # Cache
self.lastval = None # Cache
self.fullpath = self.path + "/" + self.category + "/"
if not os.path.exists(self.fullpath):
prevmask=os.umask(0)
os.makedirs(self.fullpath, 02775)
os.umask(prevmask)
try:
os.chown(self.fullpath, self.uid, self.gid)
os.chmod(self.fullpath, 02775)
except SystemExit, e:
raise
except:
pass
def has_key(self,key):
if os.path.exists(self.fullpath+key):
return 1
return 0
def keys(self):
# XXX: NEED TOOLS SEPERATED
# return portage.listdir(self.fullpath,filesonly=1)
mykeys = []
for x in os.listdir(self.fullpath):
if os.path.isfile(self.fullpath+x) and not x.startswith(".update."):
mykeys += [x]
return mykeys
def get_values(self,key):
if not key:
raise KeyError, "key is not set to a valid value"
try:
# give buffering a hint of the pretty much maximal cache size we deal with
myf = open(self.fullpath+key, "r", 8192)
except OSError, oe:
# either the file didn't exist, or it was removed under our feet.
return None
# nuke the newlines right off the batt.
data = myf.read().splitlines()
mdict = {}
# rely on exceptions to note differing line counts.
try:
for x in range(0, len(self.dbkeys)):
mdict[self.dbkeys[x]] = data[x]
# do this now, rather then earlier- possible that earlier it might have been wasted
# if key count mismatched
mdict["_mtime_"] = os.fstat(myf.fileno()).st_mtime
except IndexError:
myf.close()
raise ValueError, "Key count mistmatch"
myf.close()
return mdict
def set_values(self,key,val):
if not key:
raise KeyError, "No key provided. key:%s val:%s" % (key,val)
if not val:
raise ValueError, "No value provided. key:%s val:%s" % (key,val)
# XXX threaded cache updates won't play nice with this.
# need a synchronization primitive, or locking (of the fileno, not a seperate file)
# to correctly handle threading.
update_fp = self.fullpath + ".update." + str(os.getpid()) + "." + key
myf = open(update_fp,"w")
myf.writelines( [ val[x] +"\n" for x in self.dbkeys] )
myf.close()
os.chown(update_fp, self.uid, self.gid)
os.chmod(update_fp, 0664)
os.utime(update_fp, (-1,long(val["_mtime_"])))
os.rename(update_fp, self.fullpath+key)
def del_key(self,key):
try:
os.unlink(self.fullpath+key)
except OSError, oe:
# just attempt it without checking, due to the fact that
# a cache update could be in progress.
self.lastkey = None
self.lastval = None
return 0
return 1
def sync(self):
return
def close(self):
return
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