1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
# Copyright: 2005 Gentoo Foundation
# Author(s): Brian Harring (ferringb@gentoo.org)
# License: GPL2
# $Id$
from cache import fs_template
from cache import cache_errors
import errno, os, stat
from 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))
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_"])
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)
for k, v in values.iteritems():
if k != "_mtime_" and (k == "_eclasses_" or k in self._known_keys):
myf.write("%s=%s\n" % (k, v))
myf.close()
self._ensure_access(fp, mtime=values["_mtime_"])
#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 iterkeys(self):
"""generator for walking the dir struct"""
dirs = [self.location]
len_base = len(self.location)
while len(dirs):
for l in os.listdir(dirs[0]):
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)
|
