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# Copyright: 2005 Gentoo Foundation
# Author(s): Brian Harring (ferringb@gentoo.org)
# License: GPL2
# $Id$
from portage.cache import fs_template
from portage.cache import cache_errors
import errno, os, stat
from portage.cache.template import reconstruct_eclasses
# store the current key order *here*.
class database(fs_template.FsBased):
autocommits = True
def __init__(self, *args, **config):
super(database,self).__init__(*args, **config)
self.location = os.path.join(self.location,
self.label.lstrip(os.path.sep).rstrip(os.path.sep))
write_keys = set(self._known_keys)
write_keys.add("_eclasses_")
write_keys.add("_mtime_")
self._write_keys = sorted(write_keys)
if not self.readonly and not os.path.exists(self.location):
self._ensure_dirs()
def __getitem__(self, cpv):
fp = os.path.join(self.location, cpv)
try:
myf = open(fp, "r")
try:
d = self._parse_data(myf, cpv)
if "_mtime_" not in d:
"""Backward compatibility with old cache that uses mtime
mangling."""
d["_mtime_"] = long(os.fstat(myf.fileno()).st_mtime)
return d
finally:
myf.close()
except (IOError, OSError), e:
if e.errno != errno.ENOENT:
raise cache_errors.CacheCorruption(cpv, e)
raise KeyError(cpv)
def _parse_data(self, data, cpv):
try:
d = dict(map(lambda x:x.rstrip("\n").split("=", 1), data))
except ValueError, e:
# If a line is missing an "=", the split length is 1 instead of 2.
raise cache_errors.CacheCorruption(cpv, e)
if "_eclasses_" in d:
d["_eclasses_"] = reconstruct_eclasses(cpv, d["_eclasses_"])
else:
d["_eclasses_"] = {}
return d
for x in self._known_keys:
if x not in d:
d[x] = ''
return d
def _setitem(self, cpv, values):
# import pdb;pdb.set_trace()
s = cpv.rfind("/")
fp = os.path.join(self.location,cpv[:s],".update.%i.%s" % (os.getpid(), cpv[s+1:]))
try: myf=open(fp, "w")
except (IOError, OSError), e:
if errno.ENOENT == e.errno:
try:
self._ensure_dirs(cpv)
myf=open(fp,"w")
except (OSError, IOError),e:
raise cache_errors.CacheCorruption(cpv, e)
else:
raise cache_errors.CacheCorruption(cpv, e)
try:
for k in self._write_keys:
v = values.get(k)
if not v:
continue
myf.write("%s=%s\n" % (k, v))
finally:
myf.close()
self._ensure_access(fp)
#update written. now we move it.
new_fp = os.path.join(self.location,cpv)
try: os.rename(fp, new_fp)
except (OSError, IOError), e:
os.remove(fp)
raise cache_errors.CacheCorruption(cpv, e)
def _delitem(self, cpv):
# import pdb;pdb.set_trace()
try:
os.remove(os.path.join(self.location,cpv))
except OSError, e:
if errno.ENOENT == e.errno:
raise KeyError(cpv)
else:
raise cache_errors.CacheCorruption(cpv, e)
def __contains__(self, cpv):
return os.path.exists(os.path.join(self.location, cpv))
def __iter__(self):
"""generator for walking the dir struct"""
dirs = [self.location]
len_base = len(self.location)
while len(dirs):
try:
dir_list = os.listdir(dirs[0])
except OSError, e:
if e.errno != errno.ENOENT:
raise
del e
dirs.pop(0)
continue
for l in dir_list:
if l.endswith(".cpickle"):
continue
p = os.path.join(dirs[0],l)
st = os.lstat(p)
if stat.S_ISDIR(st.st_mode):
dirs.append(p)
continue
yield p[len_base+1:]
dirs.pop(0)
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