15
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
17
import stat, os, sha, time
18
from binascii import b2a_qp, a2b_qp
19
20
from trace import mutter
20
21
from errors import BzrError, BzrCheckError
58
59
to gradually adjust your clock or don't use bzr over the step.
60
61
At the moment this is stored in a simple textfile; it might be nice
61
to use a tdb instead to allow faster lookup by file-id.
63
64
The cache is represented as a map from file_id to a tuple of (file_id,
64
65
sha1, path, size, mtime, ctime, ino, dev).
66
67
The SHA-1 is stored in memory as a hexdigest.
68
This version of the file on disk has one line per record, and fields
69
separated by \0 records.
69
File names are written out as the quoted-printable encoding of their
72
73
# order of fields returned by fingerprint()
105
102
fs.st_ctime, fs.st_ino, fs.st_dev)
109
def _write_cache(basedir, entries):
105
def _write_cache(basedir, entry_iter, dangerfiles):
110
106
from atomicfile import AtomicFile
112
108
cachefn = os.path.join(basedir, '.bzr', 'stat-cache')
113
109
outf = AtomicFile(cachefn, 'wb')
115
outf.write(CACHE_HEADER + '\n')
117
for entry in entries:
111
for entry in entry_iter:
118
112
if len(entry) != 8:
119
113
raise ValueError("invalid statcache entry tuple %r" % entry)
120
outf.write(entry[0].encode('utf-8')) # file id
122
outf.write(entry[1]) # hex sha1
124
outf.write(entry[2].encode('utf-8')) # name
115
if entry[SC_FILE_ID] in dangerfiles:
116
continue # changed too recently
117
outf.write(entry[0]) # file id
119
outf.write(entry[1]) # hex sha1
121
outf.write(b2a_qp(entry[2].encode('utf-8'), True)) # name
125
122
for nf in entry[3:]:
126
outf.write('\0%d' % nf)
123
outf.write(' %d' % nf)
131
128
if not outf.closed:
135
def _try_write_cache(basedir, entries):
137
return _write_cache(basedir, entries)
139
mutter("cannot update statcache in %s: %s" % (basedir, e))
141
mutter("cannot update statcache in %s: %s" % (basedir, e))
145
132
def load_cache(basedir):
149
from bzrlib.trace import warning
151
assert isinstance(basedir, basestring)
153
sha_re = re.compile(r'[a-f0-9]{40}')
156
138
cachefn = os.path.join(basedir, '.bzr', 'stat-cache')
157
cachefile = open(cachefn, 'rb')
139
cachefile = open(cachefn, 'r')
161
line1 = cachefile.readline().rstrip('\r\n')
162
if line1 != CACHE_HEADER:
163
mutter('cache header marker not found at top of %s; discarding cache'
167
143
for l in cachefile:
170
file_id = f[0].decode('utf-8')
171
147
if file_id in cache:
172
warning("duplicated file_id in cache: {%s}" % file_id)
175
if len(text_sha) != 40 or not sha_re.match(text_sha):
176
raise BzrCheckError("invalid file SHA-1 in cache: %r" % text_sha)
148
raise BzrError("duplicated file_id in cache: {%s}" % file_id)
178
path = f[2].decode('utf-8')
150
path = a2b_qp(f[2]).decode('utf-8')
179
151
if path in seen_paths:
180
warning("duplicated path in cache: %r" % path)
181
seen_paths[path] = True
152
raise BzrCheckError("duplicated path in cache: %r" % path)
183
entry = (file_id, text_sha, path) + tuple([long(x) for x in f[3:]])
155
entry = (file_id, f[1], path) + tuple([long(x) for x in f[3:]])
184
156
if len(entry) != 8:
185
157
raise ValueError("invalid statcache entry tuple %r" % entry)
206
179
flush -- discard any previous cache and recalculate from scratch.
209
# load the existing cache; use information there to find a list of
210
# files ordered by inode, which is alleged to be the fastest order
213
to_update = _files_from_inventory(inv)
183
# TODO: It's supposed to be faster to stat the files in order by inum.
184
# We don't directly know the inum of the files of course but we do
185
# know where they were last sighted, so we can sort by that.
215
187
assert isinstance(flush, bool)
219
191
cache = load_cache(basedir)
223
for file_id, path in to_update:
225
by_inode.append((cache[file_id][SC_INO], file_id, path))
227
without_inode.append((file_id, path))
230
to_update = [a[1:] for a in by_inode] + without_inode
232
stat_cnt = missing_cnt = new_cnt = hardcheck = change_cnt = 0
234
# dangerfiles have been recently touched and can't be committed to
235
# a persistent cache yet, but they are returned to the caller.
192
return _update_cache_from_list(basedir, cache, _files_from_inventory(inv))
196
def _update_cache_from_list(basedir, cache, to_update):
197
"""Update and return the cache for given files.
199
cache -- Previously cached values to be validated.
201
to_update -- Sequence of (file_id, path) pairs to check.
206
stat_cnt = missing_cnt = hardcheck = change_cnt = 0
208
# files that have been recently touched and can't be
209
# committed to a persistent cache yet.
238
212
now = int(time.time())
240
214
## mutter('update statcache under %r' % basedir)
274
246
mutter('statcache: statted %d files, read %d files, %d changed, %d dangerous, '
275
'%d deleted, %d new, '
277
% (stat_cnt, hardcheck, change_cnt, len(dangerfiles),
278
missing_cnt, new_cnt, len(cache)))
248
% (stat_cnt, hardcheck, change_cnt, len(dangerfiles), len(cache)))
281
251
mutter('updating on-disk statcache')
284
safe_cache = cache.copy()
285
for file_id in dangerfiles:
286
del safe_cache[file_id]
290
_try_write_cache(basedir, safe_cache.itervalues())
252
_write_cache(basedir, cache.itervalues(), dangerfiles)
added
removed
bzrlib/statcache.py
