Mercurial > hg
annotate mercurial/store.py @ 13050:3790452d499b
pushkey: use UTF-8
author | Matt Mackall <mpm@selenic.com> |
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date | Sun, 28 Nov 2010 18:21:47 -0600 |
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1 # store.py - repository store handling for Mercurial |
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2 # |
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3 # Copyright 2008 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from i18n import _ |
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9 import osutil, util |
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10 import os, stat |
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11 |
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12 _sha = util.sha1 |
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13 |
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14 # This avoids a collision between a file named foo and a dir named |
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15 # foo.i or foo.d |
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16 def encodedir(path): |
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17 if not path.startswith('data/'): |
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18 return path |
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19 return (path |
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20 .replace(".hg/", ".hg.hg/") |
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21 .replace(".i/", ".i.hg/") |
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22 .replace(".d/", ".d.hg/")) |
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23 |
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24 def decodedir(path): |
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25 if not path.startswith('data/') or ".hg/" not in path: |
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26 return path |
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27 return (path |
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28 .replace(".d.hg/", ".d/") |
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29 .replace(".i.hg/", ".i/") |
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30 .replace(".hg.hg/", ".hg/")) |
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31 |
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32 def _buildencodefun(): |
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33 e = '_' |
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34 win_reserved = [ord(x) for x in '\\:*?"<>|'] |
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35 cmap = dict([(chr(x), chr(x)) for x in xrange(127)]) |
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36 for x in (range(32) + range(126, 256) + win_reserved): |
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37 cmap[chr(x)] = "~%02x" % x |
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38 for x in range(ord("A"), ord("Z")+1) + [ord(e)]: |
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39 cmap[chr(x)] = e + chr(x).lower() |
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40 dmap = {} |
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41 for k, v in cmap.iteritems(): |
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42 dmap[v] = k |
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43 def decode(s): |
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44 i = 0 |
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45 while i < len(s): |
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46 for l in xrange(1, 4): |
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47 try: |
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48 yield dmap[s[i:i + l]] |
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49 i += l |
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50 break |
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51 except KeyError: |
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52 pass |
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53 else: |
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54 raise KeyError |
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55 return (lambda s: "".join([cmap[c] for c in encodedir(s)]), |
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56 lambda s: decodedir("".join(list(decode(s))))) |
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57 |
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58 encodefilename, decodefilename = _buildencodefun() |
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59 |
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60 def _build_lower_encodefun(): |
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61 win_reserved = [ord(x) for x in '\\:*?"<>|'] |
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62 cmap = dict([(chr(x), chr(x)) for x in xrange(127)]) |
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63 for x in (range(32) + range(126, 256) + win_reserved): |
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64 cmap[chr(x)] = "~%02x" % x |
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65 for x in range(ord("A"), ord("Z")+1): |
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66 cmap[chr(x)] = chr(x).lower() |
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67 return lambda s: "".join([cmap[c] for c in s]) |
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68 |
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69 lowerencode = _build_lower_encodefun() |
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70 |
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71 _windows_reserved_filenames = '''con prn aux nul |
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72 com1 com2 com3 com4 com5 com6 com7 com8 com9 |
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73 lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9'''.split() |
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74 def _auxencode(path, dotencode): |
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75 res = [] |
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76 for n in path.split('/'): |
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77 if n: |
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78 base = n.split('.')[0] |
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79 if base and (base in _windows_reserved_filenames): |
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80 # encode third letter ('aux' -> 'au~78') |
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81 ec = "~%02x" % ord(n[2]) |
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82 n = n[0:2] + ec + n[3:] |
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83 if n[-1] in '. ': |
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84 # encode last period or space ('foo...' -> 'foo..~2e') |
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85 n = n[:-1] + "~%02x" % ord(n[-1]) |
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86 if dotencode and n[0] in '. ': |
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87 n = "~%02x" % ord(n[0]) + n[1:] |
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88 res.append(n) |
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89 return '/'.join(res) |
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90 |
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91 MAX_PATH_LEN_IN_HGSTORE = 120 |
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92 DIR_PREFIX_LEN = 8 |
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93 _MAX_SHORTENED_DIRS_LEN = 8 * (DIR_PREFIX_LEN + 1) - 4 |
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94 def _hybridencode(path, auxencode): |
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95 '''encodes path with a length limit |
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96 |
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97 Encodes all paths that begin with 'data/', according to the following. |
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98 |
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99 Default encoding (reversible): |
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100 |
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101 Encodes all uppercase letters 'X' as '_x'. All reserved or illegal |
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102 characters are encoded as '~xx', where xx is the two digit hex code |
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103 of the character (see encodefilename). |
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104 Relevant path components consisting of Windows reserved filenames are |
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105 masked by encoding the third character ('aux' -> 'au~78', see auxencode). |
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106 |
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107 Hashed encoding (not reversible): |
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108 |
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109 If the default-encoded path is longer than MAX_PATH_LEN_IN_HGSTORE, a |
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110 non-reversible hybrid hashing of the path is done instead. |
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111 This encoding uses up to DIR_PREFIX_LEN characters of all directory |
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112 levels of the lowerencoded path, but not more levels than can fit into |
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113 _MAX_SHORTENED_DIRS_LEN. |
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114 Then follows the filler followed by the sha digest of the full path. |
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115 The filler is the beginning of the basename of the lowerencoded path |
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116 (the basename is everything after the last path separator). The filler |
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117 is as long as possible, filling in characters from the basename until |
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118 the encoded path has MAX_PATH_LEN_IN_HGSTORE characters (or all chars |
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119 of the basename have been taken). |
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120 The extension (e.g. '.i' or '.d') is preserved. |
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121 |
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122 The string 'data/' at the beginning is replaced with 'dh/', if the hashed |
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123 encoding was used. |
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124 ''' |
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125 if not path.startswith('data/'): |
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126 return path |
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127 # escape directories ending with .i and .d |
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128 path = encodedir(path) |
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129 ndpath = path[len('data/'):] |
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130 res = 'data/' + auxencode(encodefilename(ndpath)) |
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131 if len(res) > MAX_PATH_LEN_IN_HGSTORE: |
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132 digest = _sha(path).hexdigest() |
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133 aep = auxencode(lowerencode(ndpath)) |
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134 _root, ext = os.path.splitext(aep) |
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135 parts = aep.split('/') |
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136 basename = parts[-1] |
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137 sdirs = [] |
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138 for p in parts[:-1]: |
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139 d = p[:DIR_PREFIX_LEN] |
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140 if d[-1] in '. ': |
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141 # Windows can't access dirs ending in period or space |
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142 d = d[:-1] + '_' |
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143 t = '/'.join(sdirs) + '/' + d |
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144 if len(t) > _MAX_SHORTENED_DIRS_LEN: |
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145 break |
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146 sdirs.append(d) |
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147 dirs = '/'.join(sdirs) |
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148 if len(dirs) > 0: |
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149 dirs += '/' |
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150 res = 'dh/' + dirs + digest + ext |
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151 space_left = MAX_PATH_LEN_IN_HGSTORE - len(res) |
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152 if space_left > 0: |
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153 filler = basename[:space_left] |
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154 res = 'dh/' + dirs + filler + digest + ext |
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155 return res |
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156 |
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157 def _calcmode(path): |
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158 try: |
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159 # files in .hg/ will be created using this mode |
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160 mode = os.stat(path).st_mode |
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161 # avoid some useless chmods |
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162 if (0777 & ~util.umask) == (0777 & mode): |
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163 mode = None |
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164 except OSError: |
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165 mode = None |
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166 return mode |
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167 |
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168 _data = 'data 00manifest.d 00manifest.i 00changelog.d 00changelog.i' |
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169 |
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170 class basicstore(object): |
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171 '''base class for local repository stores''' |
6988 | 172 def __init__(self, path, opener, pathjoiner): |
173 self.pathjoiner = pathjoiner | |
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174 self.path = path |
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175 self.createmode = _calcmode(path) |
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176 op = opener(self.path) |
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177 op.createmode = self.createmode |
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178 self.opener = lambda f, *args, **kw: op(encodedir(f), *args, **kw) |
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179 |
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180 def join(self, f): |
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181 return self.pathjoiner(self.path, encodedir(f)) |
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182 |
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184 '''yields (unencoded, encoded, size)''' |
6988 | 185 path = self.pathjoiner(self.path, relpath) |
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186 striplen = len(self.path) + len(os.sep) |
6899 | 187 l = [] |
188 if os.path.isdir(path): | |
189 visit = [path] | |
190 while visit: | |
191 p = visit.pop() | |
192 for f, kind, st in osutil.listdir(p, stat=True): | |
6988 | 193 fp = self.pathjoiner(p, f) |
6899 | 194 if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'): |
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195 n = util.pconvert(fp[striplen:]) |
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196 l.append((decodedir(n), n, st.st_size)) |
6899 | 197 elif kind == stat.S_IFDIR and recurse: |
198 visit.append(fp) | |
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199 return sorted(l) |
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200 |
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201 def datafiles(self): |
6899 | 202 return self._walk('data', True) |
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203 |
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204 def walk(self): |
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205 '''yields (unencoded, encoded, size)''' |
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206 # yield data files first |
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207 for x in self.datafiles(): |
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208 yield x |
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209 # yield manifest before changelog |
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210 for x in reversed(self._walk('', False)): |
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211 yield x |
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212 |
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213 def copylist(self): |
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214 return ['requires'] + _data.split() |
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215 |
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216 class encodedstore(basicstore): |
6988 | 217 def __init__(self, path, opener, pathjoiner): |
218 self.pathjoiner = pathjoiner | |
219 self.path = self.pathjoiner(path, 'store') | |
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220 self.createmode = _calcmode(self.path) |
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221 op = opener(self.path) |
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222 op.createmode = self.createmode |
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224 |
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225 def datafiles(self): |
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226 for a, b, size in self._walk('data', True): |
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227 try: |
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228 a = decodefilename(a) |
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229 except KeyError: |
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230 a = None |
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231 yield a, b, size |
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232 |
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233 def join(self, f): |
6988 | 234 return self.pathjoiner(self.path, encodefilename(f)) |
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235 |
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236 def copylist(self): |
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237 return (['requires', '00changelog.i'] + |
6988 | 238 [self.pathjoiner('store', f) for f in _data.split()]) |
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239 |
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240 class fncache(object): |
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241 # the filename used to be partially encoded |
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242 # hence the encodedir/decodedir dance |
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243 def __init__(self, opener): |
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244 self.opener = opener |
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245 self.entries = None |
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246 |
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247 def _load(self): |
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248 '''fill the entries from the fncache file''' |
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249 self.entries = set() |
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250 try: |
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251 fp = self.opener('fncache', mode='rb') |
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252 except IOError: |
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253 # skip nonexistent file |
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254 return |
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255 for n, line in enumerate(fp): |
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256 if (len(line) < 2) or (line[-1] != '\n'): |
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257 t = _('invalid entry in fncache, line %s') % (n + 1) |
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258 raise util.Abort(t) |
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259 self.entries.add(decodedir(line[:-1])) |
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260 fp.close() |
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261 |
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262 def rewrite(self, files): |
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263 fp = self.opener('fncache', mode='wb') |
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264 for p in files: |
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265 fp.write(encodedir(p) + '\n') |
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266 fp.close() |
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267 self.entries = set(files) |
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268 |
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269 def add(self, fn): |
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270 if self.entries is None: |
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271 self._load() |
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272 if fn not in self.entries: |
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273 self.opener('fncache', 'ab').write(encodedir(fn) + '\n') |
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274 self.entries.add(fn) |
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275 |
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276 def __contains__(self, fn): |
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277 if self.entries is None: |
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278 self._load() |
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279 return fn in self.entries |
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280 |
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281 def __iter__(self): |
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282 if self.entries is None: |
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283 self._load() |
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284 return iter(self.entries) |
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285 |
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286 class fncachestore(basicstore): |
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287 def __init__(self, path, opener, pathjoiner, encode): |
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288 self.encode = encode |
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289 self.pathjoiner = pathjoiner |
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290 self.path = self.pathjoiner(path, 'store') |
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291 self.createmode = _calcmode(self.path) |
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292 op = opener(self.path) |
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293 op.createmode = self.createmode |
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294 fnc = fncache(op) |
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295 self.fncache = fnc |
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296 |
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297 def fncacheopener(path, mode='r', *args, **kw): |
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298 if mode not in ('r', 'rb') and path.startswith('data/'): |
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299 fnc.add(path) |
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300 return op(self.encode(path), mode, *args, **kw) |
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301 self.opener = fncacheopener |
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302 |
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303 def join(self, f): |
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304 return self.pathjoiner(self.path, self.encode(f)) |
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305 |
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306 def datafiles(self): |
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307 rewrite = False |
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308 existing = [] |
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309 pjoin = self.pathjoiner |
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310 spath = self.path |
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311 for f in self.fncache: |
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312 ef = self.encode(f) |
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313 try: |
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314 st = os.stat(pjoin(spath, ef)) |
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315 yield f, ef, st.st_size |
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316 existing.append(f) |
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317 except OSError: |
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318 # nonexistent entry |
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319 rewrite = True |
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320 if rewrite: |
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321 # rewrite fncache to remove nonexistent entries |
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322 # (may be caused by rollback / strip) |
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323 self.fncache.rewrite(existing) |
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324 |
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325 def copylist(self): |
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326 d = _data + ' dh fncache' |
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327 return (['requires', '00changelog.i'] + |
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328 [self.pathjoiner('store', f) for f in d.split()]) |
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329 |
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330 def store(requirements, path, opener, pathjoiner=None): |
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331 pathjoiner = pathjoiner or os.path.join |
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332 if 'store' in requirements: |
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333 if 'fncache' in requirements: |
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334 auxencode = lambda f: _auxencode(f, 'dotencode' in requirements) |
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335 encode = lambda f: _hybridencode(f, auxencode) |
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336 return fncachestore(path, opener, pathjoiner, encode) |
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338 return basicstore(path, opener, pathjoiner) |