author | Alex Unden <alu@zpuppet.org> |
Fri, 27 Feb 2009 02:01:45 -0800 | |
changeset 7817 | cb516e788238 |
parent 7515 | ee5aba886108 |
child 7890 | e710f0f592b2 |
permissions | -rw-r--r-- |
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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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114 |
sdirs = [] |
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115 |
for p in parts[:-1]: |
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116 |
d = p[:DIR_PREFIX_LEN] |
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117 |
if d[-1] in '. ': |
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118 |
# Windows can't access dirs ending in period or space |
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119 |
d = d[:-1] + '_' |
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120 |
t = '/'.join(sdirs) + '/' + d |
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121 |
if len(t) > _MAX_SHORTENED_DIRS_LEN: |
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122 |
break |
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123 |
sdirs.append(d) |
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124 |
dirs = '/'.join(sdirs) |
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125 |
if len(dirs) > 0: |
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126 |
dirs += '/' |
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127 |
res = 'dh/' + dirs + digest + ext |
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128 |
space_left = MAX_PATH_LEN_IN_HGSTORE - len(res) |
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129 |
if space_left > 0: |
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130 |
filler = basename[:space_left] |
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131 |
res = 'dh/' + dirs + filler + digest + ext |
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132 |
return res |
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133 |
|
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134 |
def _calcmode(path): |
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135 |
try: |
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136 |
# files in .hg/ will be created using this mode |
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137 |
mode = os.stat(path).st_mode |
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138 |
# avoid some useless chmods |
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139 |
if (0777 & ~util._umask) == (0777 & mode): |
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140 |
mode = None |
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141 |
except OSError: |
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142 |
mode = None |
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143 |
return mode |
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144 |
|
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145 |
_data = 'data 00manifest.d 00manifest.i 00changelog.d 00changelog.i' |
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146 |
|
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147 |
class basicstore: |
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148 |
'''base class for local repository stores''' |
6988 | 149 |
def __init__(self, path, opener, pathjoiner): |
150 |
self.pathjoiner = pathjoiner |
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151 |
self.path = path |
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152 |
self.createmode = _calcmode(path) |
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153 |
self.opener = opener(self.path) |
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154 |
self.opener.createmode = self.createmode |
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155 |
|
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156 |
def join(self, f): |
6988 | 157 |
return self.pathjoiner(self.path, f) |
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158 |
|
6899 | 159 |
def _walk(self, relpath, recurse): |
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160 |
'''yields (unencoded, encoded, size)''' |
6988 | 161 |
path = self.pathjoiner(self.path, relpath) |
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162 |
striplen = len(self.path) + len(os.sep) |
6899 | 163 |
l = [] |
164 |
if os.path.isdir(path): |
|
165 |
visit = [path] |
|
166 |
while visit: |
|
167 |
p = visit.pop() |
|
168 |
for f, kind, st in osutil.listdir(p, stat=True): |
|
6988 | 169 |
fp = self.pathjoiner(p, f) |
6899 | 170 |
if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'): |
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171 |
n = util.pconvert(fp[striplen:]) |
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172 |
l.append((n, n, st.st_size)) |
6899 | 173 |
elif kind == stat.S_IFDIR and recurse: |
174 |
visit.append(fp) |
|
175 |
return util.sort(l) |
|
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176 |
|
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177 |
def datafiles(self): |
6899 | 178 |
return self._walk('data', True) |
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179 |
|
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180 |
def walk(self): |
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181 |
'''yields (unencoded, encoded, size)''' |
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182 |
# yield data files first |
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183 |
for x in self.datafiles(): |
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184 |
yield x |
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185 |
# yield manifest before changelog |
6899 | 186 |
meta = self._walk('', False) |
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187 |
meta.reverse() |
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188 |
for x in meta: |
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189 |
yield x |
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190 |
|
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191 |
def copylist(self): |
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|
192 |
return ['requires'] + _data.split() |
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193 |
|
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194 |
class encodedstore(basicstore): |
6988 | 195 |
def __init__(self, path, opener, pathjoiner): |
196 |
self.pathjoiner = pathjoiner |
|
197 |
self.path = self.pathjoiner(path, 'store') |
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198 |
self.createmode = _calcmode(self.path) |
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|
199 |
op = opener(self.path) |
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200 |
op.createmode = self.createmode |
6902 | 201 |
self.opener = lambda f, *args, **kw: op(encodefilename(f), *args, **kw) |
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202 |
|
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203 |
def datafiles(self): |
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204 |
for a, b, size in self._walk('data', True): |
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|
205 |
try: |
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|
206 |
a = decodefilename(a) |
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|
207 |
except KeyError: |
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|
208 |
a = None |
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|
209 |
yield a, b, size |
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|
210 |
|
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|
211 |
def join(self, f): |
6988 | 212 |
return self.pathjoiner(self.path, encodefilename(f)) |
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213 |
|
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|
214 |
def copylist(self): |
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|
215 |
return (['requires', '00changelog.i'] + |
6988 | 216 |
[self.pathjoiner('store', f) for f in _data.split()]) |
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|
217 |
|
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|
218 |
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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227 |
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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return self.opener(hybridencode(path), mode, *args, **kw) |
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class fncachestore(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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self._op = opener(self.path) |
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self._op.createmode = self.createmode |
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self.opener = fncacheopener(self._op) |
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260 |
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def join(self, f): |
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return self.pathjoiner(self.path, hybridencode(f)) |
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263 |
|
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def datafiles(self): |
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rewrite = False |
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existing = [] |
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pjoin = self.pathjoiner |
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spath = self.path |
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for f in fncache(self._op): |
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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) |
297 |
return basicstore(path, opener, pathjoiner) |