mercurial/store.py
author Alex Unden <alu@zpuppet.org>
Fri, 27 Feb 2009 02:01:45 -0800
changeset 7817 cb516e788238
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child 7890 e710f0f592b2
permissions -rw-r--r--
bookmarks: fixes bug where a deleted bookmark may still be treated as current when track.current option is set
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# store.py - repository store handling for Mercurial
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#
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# Copyright 2008 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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from i18n import _
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import os, stat, osutil, util
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_sha = util.sha1
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def _buildencodefun():
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    e = '_'
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    win_reserved = [ord(x) for x in '\\:*?"<>|']
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    cmap = dict([ (chr(x), chr(x)) for x in xrange(127) ])
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    for x in (range(32) + range(126, 256) + win_reserved):
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        cmap[chr(x)] = "~%02x" % x
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    for x in range(ord("A"), ord("Z")+1) + [ord(e)]:
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        cmap[chr(x)] = e + chr(x).lower()
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    dmap = {}
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    for k, v in cmap.iteritems():
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        dmap[v] = k
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    def decode(s):
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        i = 0
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        while i < len(s):
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            for l in xrange(1, 4):
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                try:
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                    yield dmap[s[i:i+l]]
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                    i += l
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                    break
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                except KeyError:
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                    pass
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            else:
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                raise KeyError
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    return (lambda s: "".join([cmap[c] for c in s]),
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            lambda s: "".join(list(decode(s))))
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encodefilename, decodefilename = _buildencodefun()
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def _build_lower_encodefun():
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    win_reserved = [ord(x) for x in '\\:*?"<>|']
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    cmap = dict([ (chr(x), chr(x)) for x in xrange(127) ])
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    for x in (range(32) + range(126, 256) + win_reserved):
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        cmap[chr(x)] = "~%02x" % x
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    for x in range(ord("A"), ord("Z")+1):
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        cmap[chr(x)] = chr(x).lower()
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    return lambda s: "".join([cmap[c] for c in s])
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lowerencode = _build_lower_encodefun()
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_windows_reserved_filenames = '''con prn aux nul
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    com1 com2 com3 com4 com5 com6 com7 com8 com9
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    lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9'''.split()
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def auxencode(path):
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    res = []
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    for n in path.split('/'):
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        if n:
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            base = n.split('.')[0]
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            if base and (base in _windows_reserved_filenames):
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                # encode third letter ('aux' -> 'au~78')
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                ec = "~%02x" % ord(n[2])
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                n = n[0:2] + ec + n[3:]
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            if n[-1] in '. ':
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                # encode last period or space ('foo...' -> 'foo..~2e')
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                n = n[:-1] + "~%02x" % ord(n[-1])
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        res.append(n)
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    return '/'.join(res)
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MAX_PATH_LEN_IN_HGSTORE = 120
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DIR_PREFIX_LEN = 8
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_MAX_SHORTENED_DIRS_LEN = 8 * (DIR_PREFIX_LEN + 1) - 4
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def hybridencode(path):
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    '''encodes path with a length limit
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    Encodes all paths that begin with 'data/', according to the following.
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    Default encoding (reversible):
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    Encodes all uppercase letters 'X' as '_x'. All reserved or illegal
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    characters are encoded as '~xx', where xx is the two digit hex code
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    of the character (see encodefilename).
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    Relevant path components consisting of Windows reserved filenames are
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    masked by encoding the third character ('aux' -> 'au~78', see auxencode).
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    Hashed encoding (not reversible):
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    If the default-encoded path is longer than MAX_PATH_LEN_IN_HGSTORE, a
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    non-reversible hybrid hashing of the path is done instead.
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    This encoding uses up to DIR_PREFIX_LEN characters of all directory
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    levels of the lowerencoded path, but not more levels than can fit into
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    _MAX_SHORTENED_DIRS_LEN.
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    Then follows the filler followed by the sha digest of the full path.
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    The filler is the beginning of the basename of the lowerencoded path
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    (the basename is everything after the last path separator). The filler
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    is as long as possible, filling in characters from the basename until
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    the encoded path has MAX_PATH_LEN_IN_HGSTORE characters (or all chars
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    of the basename have been taken).
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    The extension (e.g. '.i' or '.d') is preserved.
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    The string 'data/' at the beginning is replaced with 'dh/', if the hashed
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    encoding was used.
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    '''
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    if not path.startswith('data/'):
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        return path
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    ndpath = path[len('data/'):]
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    res = 'data/' + auxencode(encodefilename(ndpath))
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    if len(res) > MAX_PATH_LEN_IN_HGSTORE:
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        digest = _sha(path).hexdigest()
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        aep = auxencode(lowerencode(ndpath))
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        _root, ext = os.path.splitext(aep)
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        parts = aep.split('/')
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        basename = parts[-1]
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        sdirs = []
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        for p in parts[:-1]:
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            d = p[:DIR_PREFIX_LEN]
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            if d[-1] in '. ':
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                # Windows can't access dirs ending in period or space
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                d = d[:-1] + '_'
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            t = '/'.join(sdirs) + '/' + d
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            if len(t) > _MAX_SHORTENED_DIRS_LEN:
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                break
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            sdirs.append(d)
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        dirs = '/'.join(sdirs)
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        if len(dirs) > 0:
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            dirs += '/'
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        res = 'dh/' + dirs + digest + ext
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        space_left = MAX_PATH_LEN_IN_HGSTORE - len(res)
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        if space_left > 0:
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            filler = basename[:space_left]
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            res = 'dh/' + dirs + filler + digest + ext
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    return res
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def _calcmode(path):
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    try:
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        # files in .hg/ will be created using this mode
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        mode = os.stat(path).st_mode
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            # avoid some useless chmods
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        if (0777 & ~util._umask) == (0777 & mode):
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            mode = None
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    except OSError:
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        mode = None
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    return mode
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_data = 'data 00manifest.d 00manifest.i 00changelog.d  00changelog.i'
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class basicstore:
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    '''base class for local repository stores'''
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    def __init__(self, path, opener, pathjoiner):
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        self.pathjoiner = pathjoiner
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        self.path = path
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        self.createmode = _calcmode(path)
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        self.opener = opener(self.path)
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        self.opener.createmode = self.createmode
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    def join(self, f):
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        return self.pathjoiner(self.path, f)
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    def _walk(self, relpath, recurse):
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        '''yields (unencoded, encoded, size)'''
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        path = self.pathjoiner(self.path, relpath)
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        striplen = len(self.path) + len(os.sep)
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        l = []
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        if os.path.isdir(path):
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            visit = [path]
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            while visit:
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                p = visit.pop()
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                for f, kind, st in osutil.listdir(p, stat=True):
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                    fp = self.pathjoiner(p, f)
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                    if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'):
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                        n = util.pconvert(fp[striplen:])
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                        l.append((n, n, st.st_size))
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                    elif kind == stat.S_IFDIR and recurse:
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                        visit.append(fp)
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        return util.sort(l)
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    def datafiles(self):
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        return self._walk('data', True)
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    def walk(self):
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        '''yields (unencoded, encoded, size)'''
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        # yield data files first
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        for x in self.datafiles():
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            yield x
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        # yield manifest before changelog
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        meta = self._walk('', False)
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        meta.reverse()
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        for x in meta:
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            yield x
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    def copylist(self):
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        return ['requires'] + _data.split()
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class encodedstore(basicstore):
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    def __init__(self, path, opener, pathjoiner):
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        self.pathjoiner = pathjoiner
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        self.path = self.pathjoiner(path, 'store')
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        self.createmode = _calcmode(self.path)
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        op = opener(self.path)
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        op.createmode = self.createmode
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        self.opener = lambda f, *args, **kw: op(encodefilename(f), *args, **kw)
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   202
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    def datafiles(self):
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        for a, b, size in self._walk('data', True):
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            try:
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                a = decodefilename(a)
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            except KeyError:
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   208
                a = None
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            yield a, b, size
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    def join(self, f):
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   212
        return self.pathjoiner(self.path, encodefilename(f))
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   213
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    def copylist(self):
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   215
        return (['requires', '00changelog.i'] +
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   216
                [self.pathjoiner('store', f) for f in _data.split()])
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   217
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def fncache(opener):
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   219
    '''yields the entries in the fncache file'''
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   220
    try:
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   221
        fp = opener('fncache', mode='rb')
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   222
    except IOError:
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   223
        # skip nonexistent file
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   224
        return
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   225
    for n, line in enumerate(fp):
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   226
        if (len(line) < 2) or (line[-1] != '\n'):
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            t = _('invalid entry in fncache, line %s') % (n + 1)
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   228
            raise util.Abort(t)
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   229
        yield line[:-1]
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   230
    fp.close()
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   231
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   232
class fncacheopener(object):
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   233
    def __init__(self, opener):
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   234
        self.opener = opener
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   235
        self.entries = None
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   236
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   237
    def loadfncache(self):
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   238
        self.entries = {}
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   239
        for f in fncache(self.opener):
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   240
            self.entries[f] = True
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   241
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   242
    def __call__(self, path, mode='r', *args, **kw):
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   243
        if mode not in ('r', 'rb') and path.startswith('data/'):
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   244
            if self.entries is None:
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   245
                self.loadfncache()
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   246
            if path not in self.entries:
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   247
                self.opener('fncache', 'ab').write(path + '\n')
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   248
                # fncache may contain non-existent files after rollback / strip
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   249
                self.entries[path] = True
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   250
        return self.opener(hybridencode(path), mode, *args, **kw)
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   251
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   252
class fncachestore(basicstore):
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   253
    def __init__(self, path, opener, pathjoiner):
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   254
        self.pathjoiner = pathjoiner
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   255
        self.path = self.pathjoiner(path, 'store')
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   256
        self.createmode = _calcmode(self.path)
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   257
        self._op = opener(self.path)
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   258
        self._op.createmode = self.createmode
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   259
        self.opener = fncacheopener(self._op)
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   260
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   261
    def join(self, f):
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   262
        return self.pathjoiner(self.path, hybridencode(f))
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   263
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   264
    def datafiles(self):
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   265
        rewrite = False
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   266
        existing = []
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   267
        pjoin = self.pathjoiner
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   268
        spath = self.path
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   269
        for f in fncache(self._op):
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   270
            ef = hybridencode(f)
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            try:
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                st = os.stat(pjoin(spath, ef))
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                yield f, ef, st.st_size
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                existing.append(f)
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            except OSError:
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                # nonexistent entry
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                rewrite = True
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        if rewrite:
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            # rewrite fncache to remove nonexistent entries
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            # (may be caused by rollback / strip)
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            fp = self._op('fncache', mode='wb')
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            for p in existing:
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                fp.write(p + '\n')
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            fp.close()
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    def copylist(self):
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        d = _data + ' dh fncache'
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        return (['requires', '00changelog.i'] +
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                [self.pathjoiner('store', f) for f in d.split()])
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def store(requirements, path, opener, pathjoiner=None):
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    pathjoiner = pathjoiner or os.path.join
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    if 'store' in requirements:
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        if 'fncache' in requirements:
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            return fncachestore(path, opener, pathjoiner)
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        return encodedstore(path, opener, pathjoiner)
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    return basicstore(path, opener, pathjoiner)