# 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 or any later version.
from i18n import _
import osutil, scmutil, util
import os, stat, errno
_sha = util.sha1
# This avoids a collision between a file named foo and a dir named
# foo.i or foo.d
def encodedir(path):
'''
>>> encodedir('data/foo.i')
'data/foo.i'
>>> encodedir('data/foo.i/bla.i')
'data/foo.i.hg/bla.i'
>>> encodedir('data/foo.i.hg/bla.i')
'data/foo.i.hg.hg/bla.i'
'''
if not path.startswith('data/'):
return path
return (path
.replace(".hg/", ".hg.hg/")
.replace(".i/", ".i.hg/")
.replace(".d/", ".d.hg/"))
def decodedir(path):
'''
>>> decodedir('data/foo.i')
'data/foo.i'
>>> decodedir('data/foo.i.hg/bla.i')
'data/foo.i/bla.i'
>>> decodedir('data/foo.i.hg.hg/bla.i')
'data/foo.i.hg/bla.i'
'''
if not path.startswith('data/') or ".hg/" not in path:
return path
return (path
.replace(".d.hg/", ".d/")
.replace(".i.hg/", ".i/")
.replace(".hg.hg/", ".hg/"))
def _buildencodefun():
'''
>>> enc, dec = _buildencodefun()
>>> enc('nothing/special.txt')
'nothing/special.txt'
>>> dec('nothing/special.txt')
'nothing/special.txt'
>>> enc('HELLO')
'_h_e_l_l_o'
>>> dec('_h_e_l_l_o')
'HELLO'
>>> enc('hello:world?')
'hello~3aworld~3f'
>>> dec('hello~3aworld~3f')
'hello:world?'
>>> enc('the\x07quick\xADshot')
'the~07quick~adshot'
>>> dec('the~07quick~adshot')
'the\\x07quick\\xadshot'
'''
e = '_'
winreserved = [ord(x) for x in '\\:*?"<>|']
cmap = dict([(chr(x), chr(x)) for x in xrange(127)])
for x in (range(32) + range(126, 256) + winreserved):
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 _buildlowerencodefun():
'''
>>> f = _buildlowerencodefun()
>>> f('nothing/special.txt')
'nothing/special.txt'
>>> f('HELLO')
'hello'
>>> f('hello:world?')
'hello~3aworld~3f'
>>> f('the\x07quick\xADshot')
'the~07quick~adshot'
'''
winreserved = [ord(x) for x in '\\:*?"<>|']
cmap = dict([(chr(x), chr(x)) for x in xrange(127)])
for x in (range(32) + range(126, 256) + winreserved):
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 = _buildlowerencodefun()
_winreservednames = '''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, dotencode):
'''
Encodes filenames containing names reserved by Windows or which end in
period or space. Does not touch other single reserved characters c.
Specifically, c in '\\:*?"<>|' or ord(c) <= 31 are *not* encoded here.
Additionally encodes space or period at the beginning, if dotencode is
True.
path is assumed to be all lowercase.
>>> _auxencode('.foo/aux.txt/txt.aux/con/prn/nul/foo.', True)
'~2efoo/au~78.txt/txt.aux/co~6e/pr~6e/nu~6c/foo~2e'
>>> _auxencode('.com1com2/lpt9.lpt4.lpt1/conprn/foo.', False)
'.com1com2/lp~749.lpt4.lpt1/conprn/foo~2e'
>>> _auxencode('foo. ', True)
'foo.~20'
>>> _auxencode(' .foo', True)
'~20.foo'
'''
res = []
for n in path.split('/'):
if n:
base = n.split('.')[0]
if base and (base in _winreservednames):
# 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])
if dotencode and n[0] in '. ':
n = "~%02x" % ord(n[0]) + n[1:]
res.append(n)
return '/'.join(res)
_maxstorepathlen = 120
_dirprefixlen = 8
_maxshortdirslen = 8 * (_dirprefixlen + 1) - 4
def _hybridencode(path, auxencode):
'''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 _maxstorepathlen, a
non-reversible hybrid hashing of the path is done instead.
This encoding uses up to _dirprefixlen characters of all directory
levels of the lowerencoded path, but not more levels than can fit into
_maxshortdirslen.
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 _maxstorepathlen 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) > _maxstorepathlen:
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[:_dirprefixlen]
if d[-1] in '. ':
# Windows can't access dirs ending in period or space
d = d[:-1] + '_'
t = '/'.join(sdirs) + '/' + d
if len(t) > _maxshortdirslen:
break
sdirs.append(d)
dirs = '/'.join(sdirs)
if len(dirs) > 0:
dirs += '/'
res = 'dh/' + dirs + digest + ext
spaceleft = _maxstorepathlen - len(res)
if spaceleft > 0:
filler = basename[:spaceleft]
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'
' phaseroots obsstore')
class basicstore(object):
'''base class for local repository stores'''
def __init__(self, path, openertype):
self.path = path
self.createmode = _calcmode(path)
op = openertype(self.path)
op.createmode = self.createmode
self.opener = scmutil.filteropener(op, encodedir)
def join(self, f):
return self.path + '/' + encodedir(f)
def _walk(self, relpath, recurse):
'''yields (unencoded, encoded, size)'''
path = self.path
if relpath:
path += '/' + relpath
striplen = len(self.path) + 1
l = []
if os.path.isdir(path):
visit = [path]
while visit:
p = visit.pop()
for f, kind, st in osutil.listdir(p, stat=True):
fp = 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)
l.sort()
return 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()
def write(self):
pass
class encodedstore(basicstore):
def __init__(self, path, openertype):
self.path = path + '/store'
self.createmode = _calcmode(self.path)
op = openertype(self.path)
op.createmode = self.createmode
self.opener = scmutil.filteropener(op, encodefilename)
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.path + '/' + encodefilename(f)
def copylist(self):
return (['requires', '00changelog.i'] +
['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
self._dirty = False
def _load(self):
'''fill the entries from the fncache file'''
self._dirty = False
try:
fp = self.opener('fncache', mode='rb')
except IOError:
# skip nonexistent file
self.entries = set()
return
self.entries = set(map(decodedir, fp.read().splitlines()))
if '' in self.entries:
fp.seek(0)
for n, line in enumerate(fp):
if not line.rstrip('\n'):
t = _('invalid entry in fncache, line %s') % (n + 1)
raise util.Abort(t)
fp.close()
def _write(self, files, atomictemp):
fp = self.opener('fncache', mode='wb', atomictemp=atomictemp)
if files:
fp.write('\n'.join(map(encodedir, files)) + '\n')
fp.close()
self._dirty = False
def rewrite(self, files):
self._write(files, False)
self.entries = set(files)
def write(self):
if self._dirty:
self._write(self.entries, True)
def add(self, fn):
if self.entries is None:
self._load()
if fn not in self.entries:
self._dirty = True
self.entries.add(fn)
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 _fncacheopener(scmutil.abstractopener):
def __init__(self, op, fnc, encode):
self.opener = op
self.fncache = fnc
self.encode = encode
def __call__(self, path, mode='r', *args, **kw):
if mode not in ('r', 'rb') and path.startswith('data/'):
self.fncache.add(path)
return self.opener(self.encode(path), mode, *args, **kw)
class fncachestore(basicstore):
def __init__(self, path, openertype, encode):
self.encode = encode
self.path = path + '/store'
self.createmode = _calcmode(self.path)
op = openertype(self.path)
op.createmode = self.createmode
fnc = fncache(op)
self.fncache = fnc
self.opener = _fncacheopener(op, fnc, encode)
def join(self, f):
return self.path + '/' + self.encode(f)
def getsize(self, path):
return os.stat(self.path + '/' + path).st_size
def datafiles(self):
rewrite = False
existing = []
for f in sorted(self.fncache):
ef = self.encode(f)
try:
yield f, ef, self.getsize(ef)
existing.append(f)
except OSError, err:
if err.errno != errno.ENOENT:
raise
# 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 phaseroots obsstore'
' 00manifest.d 00manifest.i 00changelog.d 00changelog.i')
return (['requires', '00changelog.i'] +
['store/' + f for f in d.split()])
def write(self):
self.fncache.write()
def store(requirements, path, openertype):
if 'store' in requirements:
if 'fncache' in requirements:
auxencode = lambda f: _auxencode(f, 'dotencode' in requirements)
encode = lambda f: _hybridencode(f, auxencode)
return fncachestore(path, openertype, encode)
return encodedstore(path, openertype)
return basicstore(path, openertype)