|
|
# store.py - repository store handling for Mercurial
|
|
|
#
|
|
|
# Copyright 2008 Matt Mackall <mpm@selenic.com>
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms of the
|
|
|
# GNU General Public License version 2, incorporated herein by reference.
|
|
|
|
|
|
from i18n import _
|
|
|
import osutil, util
|
|
|
import os, stat
|
|
|
|
|
|
_sha = util.sha1
|
|
|
|
|
|
# This avoids a collision between a file named foo and a dir named
|
|
|
# foo.i or foo.d
|
|
|
def encodedir(path):
|
|
|
if not path.startswith('data/'):
|
|
|
return path
|
|
|
return (path
|
|
|
.replace(".hg/", ".hg.hg/")
|
|
|
.replace(".i/", ".i.hg/")
|
|
|
.replace(".d/", ".d.hg/"))
|
|
|
|
|
|
def decodedir(path):
|
|
|
if not path.startswith('data/'):
|
|
|
return path
|
|
|
return (path
|
|
|
.replace(".d.hg/", ".d/")
|
|
|
.replace(".i.hg/", ".i/")
|
|
|
.replace(".hg.hg/", ".hg/"))
|
|
|
|
|
|
def _buildencodefun():
|
|
|
e = '_'
|
|
|
win_reserved = [ord(x) for x in '\\:*?"<>|']
|
|
|
cmap = dict([ (chr(x), chr(x)) for x in xrange(127) ])
|
|
|
for x in (range(32) + range(126, 256) + win_reserved):
|
|
|
cmap[chr(x)] = "~%02x" % x
|
|
|
for x in range(ord("A"), ord("Z")+1) + [ord(e)]:
|
|
|
cmap[chr(x)] = e + chr(x).lower()
|
|
|
dmap = {}
|
|
|
for k, v in cmap.iteritems():
|
|
|
dmap[v] = k
|
|
|
def decode(s):
|
|
|
i = 0
|
|
|
while i < len(s):
|
|
|
for l in xrange(1, 4):
|
|
|
try:
|
|
|
yield dmap[s[i:i+l]]
|
|
|
i += l
|
|
|
break
|
|
|
except KeyError:
|
|
|
pass
|
|
|
else:
|
|
|
raise KeyError
|
|
|
return (lambda s: "".join([cmap[c] for c in encodedir(s)]),
|
|
|
lambda s: decodedir("".join(list(decode(s)))))
|
|
|
|
|
|
encodefilename, decodefilename = _buildencodefun()
|
|
|
|
|
|
def _build_lower_encodefun():
|
|
|
win_reserved = [ord(x) for x in '\\:*?"<>|']
|
|
|
cmap = dict([ (chr(x), chr(x)) for x in xrange(127) ])
|
|
|
for x in (range(32) + range(126, 256) + win_reserved):
|
|
|
cmap[chr(x)] = "~%02x" % x
|
|
|
for x in range(ord("A"), ord("Z")+1):
|
|
|
cmap[chr(x)] = chr(x).lower()
|
|
|
return lambda s: "".join([cmap[c] for c in s])
|
|
|
|
|
|
lowerencode = _build_lower_encodefun()
|
|
|
|
|
|
_windows_reserved_filenames = '''con prn aux nul
|
|
|
com1 com2 com3 com4 com5 com6 com7 com8 com9
|
|
|
lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9'''.split()
|
|
|
def auxencode(path):
|
|
|
res = []
|
|
|
for n in path.split('/'):
|
|
|
if n:
|
|
|
base = n.split('.')[0]
|
|
|
if base and (base in _windows_reserved_filenames):
|
|
|
# encode third letter ('aux' -> 'au~78')
|
|
|
ec = "~%02x" % ord(n[2])
|
|
|
n = n[0:2] + ec + n[3:]
|
|
|
if n[-1] in '. ':
|
|
|
# encode last period or space ('foo...' -> 'foo..~2e')
|
|
|
n = n[:-1] + "~%02x" % ord(n[-1])
|
|
|
res.append(n)
|
|
|
return '/'.join(res)
|
|
|
|
|
|
MAX_PATH_LEN_IN_HGSTORE = 120
|
|
|
DIR_PREFIX_LEN = 8
|
|
|
_MAX_SHORTENED_DIRS_LEN = 8 * (DIR_PREFIX_LEN + 1) - 4
|
|
|
def hybridencode(path):
|
|
|
'''encodes path with a length limit
|
|
|
|
|
|
Encodes all paths that begin with 'data/', according to the following.
|
|
|
|
|
|
Default encoding (reversible):
|
|
|
|
|
|
Encodes all uppercase letters 'X' as '_x'. All reserved or illegal
|
|
|
characters are encoded as '~xx', where xx is the two digit hex code
|
|
|
of the character (see encodefilename).
|
|
|
Relevant path components consisting of Windows reserved filenames are
|
|
|
masked by encoding the third character ('aux' -> 'au~78', see auxencode).
|
|
|
|
|
|
Hashed encoding (not reversible):
|
|
|
|
|
|
If the default-encoded path is longer than MAX_PATH_LEN_IN_HGSTORE, a
|
|
|
non-reversible hybrid hashing of the path is done instead.
|
|
|
This encoding uses up to DIR_PREFIX_LEN characters of all directory
|
|
|
levels of the lowerencoded path, but not more levels than can fit into
|
|
|
_MAX_SHORTENED_DIRS_LEN.
|
|
|
Then follows the filler followed by the sha digest of the full path.
|
|
|
The filler is the beginning of the basename of the lowerencoded path
|
|
|
(the basename is everything after the last path separator). The filler
|
|
|
is as long as possible, filling in characters from the basename until
|
|
|
the encoded path has MAX_PATH_LEN_IN_HGSTORE characters (or all chars
|
|
|
of the basename have been taken).
|
|
|
The extension (e.g. '.i' or '.d') is preserved.
|
|
|
|
|
|
The string 'data/' at the beginning is replaced with 'dh/', if the hashed
|
|
|
encoding was used.
|
|
|
'''
|
|
|
if not path.startswith('data/'):
|
|
|
return path
|
|
|
# escape directories ending with .i and .d
|
|
|
path = encodedir(path)
|
|
|
ndpath = path[len('data/'):]
|
|
|
res = 'data/' + auxencode(encodefilename(ndpath))
|
|
|
if len(res) > MAX_PATH_LEN_IN_HGSTORE:
|
|
|
digest = _sha(path).hexdigest()
|
|
|
aep = auxencode(lowerencode(ndpath))
|
|
|
_root, ext = os.path.splitext(aep)
|
|
|
parts = aep.split('/')
|
|
|
basename = parts[-1]
|
|
|
sdirs = []
|
|
|
for p in parts[:-1]:
|
|
|
d = p[:DIR_PREFIX_LEN]
|
|
|
if d[-1] in '. ':
|
|
|
# Windows can't access dirs ending in period or space
|
|
|
d = d[:-1] + '_'
|
|
|
t = '/'.join(sdirs) + '/' + d
|
|
|
if len(t) > _MAX_SHORTENED_DIRS_LEN:
|
|
|
break
|
|
|
sdirs.append(d)
|
|
|
dirs = '/'.join(sdirs)
|
|
|
if len(dirs) > 0:
|
|
|
dirs += '/'
|
|
|
res = 'dh/' + dirs + digest + ext
|
|
|
space_left = MAX_PATH_LEN_IN_HGSTORE - len(res)
|
|
|
if space_left > 0:
|
|
|
filler = basename[:space_left]
|
|
|
res = 'dh/' + dirs + filler + digest + ext
|
|
|
return res
|
|
|
|
|
|
def _calcmode(path):
|
|
|
try:
|
|
|
# files in .hg/ will be created using this mode
|
|
|
mode = os.stat(path).st_mode
|
|
|
# avoid some useless chmods
|
|
|
if (0777 & ~util.umask) == (0777 & mode):
|
|
|
mode = None
|
|
|
except OSError:
|
|
|
mode = None
|
|
|
return mode
|
|
|
|
|
|
_data = 'data 00manifest.d 00manifest.i 00changelog.d 00changelog.i'
|
|
|
|
|
|
class basicstore(object):
|
|
|
'''base class for local repository stores'''
|
|
|
def __init__(self, path, opener, pathjoiner):
|
|
|
self.pathjoiner = pathjoiner
|
|
|
self.path = path
|
|
|
self.createmode = _calcmode(path)
|
|
|
op = opener(self.path)
|
|
|
op.createmode = self.createmode
|
|
|
self.opener = lambda f, *args, **kw: op(encodedir(f), *args, **kw)
|
|
|
|
|
|
def join(self, f):
|
|
|
return self.pathjoiner(self.path, encodedir(f))
|
|
|
|
|
|
def _walk(self, relpath, recurse):
|
|
|
'''yields (unencoded, encoded, size)'''
|
|
|
path = self.pathjoiner(self.path, relpath)
|
|
|
striplen = len(self.path) + len(os.sep)
|
|
|
l = []
|
|
|
if os.path.isdir(path):
|
|
|
visit = [path]
|
|
|
while visit:
|
|
|
p = visit.pop()
|
|
|
for f, kind, st in osutil.listdir(p, stat=True):
|
|
|
fp = self.pathjoiner(p, f)
|
|
|
if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'):
|
|
|
n = util.pconvert(fp[striplen:])
|
|
|
l.append((decodedir(n), n, st.st_size))
|
|
|
elif kind == stat.S_IFDIR and recurse:
|
|
|
visit.append(fp)
|
|
|
return sorted(l)
|
|
|
|
|
|
def datafiles(self):
|
|
|
return self._walk('data', True)
|
|
|
|
|
|
def walk(self):
|
|
|
'''yields (unencoded, encoded, size)'''
|
|
|
# yield data files first
|
|
|
for x in self.datafiles():
|
|
|
yield x
|
|
|
# yield manifest before changelog
|
|
|
for x in reversed(self._walk('', False)):
|
|
|
yield x
|
|
|
|
|
|
def copylist(self):
|
|
|
return ['requires'] + _data.split()
|
|
|
|
|
|
class encodedstore(basicstore):
|
|
|
def __init__(self, path, opener, pathjoiner):
|
|
|
self.pathjoiner = pathjoiner
|
|
|
self.path = self.pathjoiner(path, 'store')
|
|
|
self.createmode = _calcmode(self.path)
|
|
|
op = opener(self.path)
|
|
|
op.createmode = self.createmode
|
|
|
self.opener = lambda f, *args, **kw: op(encodefilename(f), *args, **kw)
|
|
|
|
|
|
def datafiles(self):
|
|
|
for a, b, size in self._walk('data', True):
|
|
|
try:
|
|
|
a = decodefilename(a)
|
|
|
except KeyError:
|
|
|
a = None
|
|
|
yield a, b, size
|
|
|
|
|
|
def join(self, f):
|
|
|
return self.pathjoiner(self.path, encodefilename(f))
|
|
|
|
|
|
def copylist(self):
|
|
|
return (['requires', '00changelog.i'] +
|
|
|
[self.pathjoiner('store', f) for f in _data.split()])
|
|
|
|
|
|
class fncache(object):
|
|
|
# the filename used to be partially encoded
|
|
|
# hence the encodedir/decodedir dance
|
|
|
def __init__(self, opener):
|
|
|
self.opener = opener
|
|
|
self.entries = None
|
|
|
|
|
|
def _load(self):
|
|
|
'''fill the entries from the fncache file'''
|
|
|
self.entries = set()
|
|
|
try:
|
|
|
fp = self.opener('fncache', mode='rb')
|
|
|
except IOError:
|
|
|
# skip nonexistent file
|
|
|
return
|
|
|
for n, line in enumerate(fp):
|
|
|
if (len(line) < 2) or (line[-1] != '\n'):
|
|
|
t = _('invalid entry in fncache, line %s') % (n + 1)
|
|
|
raise util.Abort(t)
|
|
|
self.entries.add(decodedir(line[:-1]))
|
|
|
fp.close()
|
|
|
|
|
|
def rewrite(self, files):
|
|
|
fp = self.opener('fncache', mode='wb')
|
|
|
for p in files:
|
|
|
fp.write(encodedir(p) + '\n')
|
|
|
fp.close()
|
|
|
self.entries = set(files)
|
|
|
|
|
|
def add(self, fn):
|
|
|
if self.entries is None:
|
|
|
self._load()
|
|
|
self.opener('fncache', 'ab').write(encodedir(fn) + '\n')
|
|
|
|
|
|
def __contains__(self, fn):
|
|
|
if self.entries is None:
|
|
|
self._load()
|
|
|
return fn in self.entries
|
|
|
|
|
|
def __iter__(self):
|
|
|
if self.entries is None:
|
|
|
self._load()
|
|
|
return iter(self.entries)
|
|
|
|
|
|
class fncachestore(basicstore):
|
|
|
def __init__(self, path, opener, pathjoiner):
|
|
|
self.pathjoiner = pathjoiner
|
|
|
self.path = self.pathjoiner(path, 'store')
|
|
|
self.createmode = _calcmode(self.path)
|
|
|
self._op = opener(self.path)
|
|
|
self._op.createmode = self.createmode
|
|
|
self.fncache = fncache(self._op)
|
|
|
|
|
|
def fncacheopener(path, mode='r', *args, **kw):
|
|
|
if (mode not in ('r', 'rb')
|
|
|
and path.startswith('data/')
|
|
|
and path not in self.fncache):
|
|
|
self.fncache.add(path)
|
|
|
return self._op(hybridencode(path), mode, *args, **kw)
|
|
|
self.opener = fncacheopener
|
|
|
|
|
|
def join(self, f):
|
|
|
return self.pathjoiner(self.path, hybridencode(f))
|
|
|
|
|
|
def datafiles(self):
|
|
|
rewrite = False
|
|
|
existing = []
|
|
|
pjoin = self.pathjoiner
|
|
|
spath = self.path
|
|
|
for f in self.fncache:
|
|
|
ef = hybridencode(f)
|
|
|
try:
|
|
|
st = os.stat(pjoin(spath, ef))
|
|
|
yield f, ef, st.st_size
|
|
|
existing.append(f)
|
|
|
except OSError:
|
|
|
# nonexistent entry
|
|
|
rewrite = True
|
|
|
if rewrite:
|
|
|
# rewrite fncache to remove nonexistent entries
|
|
|
# (may be caused by rollback / strip)
|
|
|
self.fncache.rewrite(existing)
|
|
|
|
|
|
def copylist(self):
|
|
|
d = _data + ' dh fncache'
|
|
|
return (['requires', '00changelog.i'] +
|
|
|
[self.pathjoiner('store', f) for f in d.split()])
|
|
|
|
|
|
def store(requirements, path, opener, pathjoiner=None):
|
|
|
pathjoiner = pathjoiner or os.path.join
|
|
|
if 'store' in requirements:
|
|
|
if 'fncache' in requirements:
|
|
|
return fncachestore(path, opener, pathjoiner)
|
|
|
return encodedstore(path, opener, pathjoiner)
|
|
|
return basicstore(path, opener, pathjoiner)
|
|
|
|