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annotate mercurial/store.py @ 8480:0e91bcaaa92c

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store: create set directly from iterable
author Martin Geisler <mg@lazybytes.net>
date Sun, 17 May 2009 16:56:20 +0200
parents 9890151a7f30
children 03196ac9a8b9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6839
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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
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6 # GNU General Public License version 2, incorporated herein by reference.
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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 def _buildencodefun():
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15 e = '_'
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16 win_reserved = [ord(x) for x in '\\:*?"<>|']
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17 cmap = dict([ (chr(x), chr(x)) for x in xrange(127) ])
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18 for x in (range(32) + range(126, 256) + win_reserved):
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19 cmap[chr(x)] = "~%02x" % x
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20 for x in range(ord("A"), ord("Z")+1) + [ord(e)]:
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21 cmap[chr(x)] = e + chr(x).lower()
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22 dmap = {}
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23 for k, v in cmap.iteritems():
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24 dmap[v] = k
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25 def decode(s):
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26 i = 0
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27 while i < len(s):
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28 for l in xrange(1, 4):
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29 try:
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30 yield dmap[s[i:i+l]]
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31 i += l
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32 break
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33 except KeyError:
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34 pass
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35 else:
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36 raise KeyError
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37 return (lambda s: "".join([cmap[c] for c in s]),
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38 lambda s: "".join(list(decode(s))))
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39
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40 encodefilename, decodefilename = _buildencodefun()
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41
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42 def _build_lower_encodefun():
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43 win_reserved = [ord(x) for x in '\\:*?"<>|']
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44 cmap = dict([ (chr(x), chr(x)) for x in xrange(127) ])
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45 for x in (range(32) + range(126, 256) + win_reserved):
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46 cmap[chr(x)] = "~%02x" % x
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47 for x in range(ord("A"), ord("Z")+1):
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48 cmap[chr(x)] = chr(x).lower()
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49 return lambda s: "".join([cmap[c] for c in s])
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50
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51 lowerencode = _build_lower_encodefun()
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52
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53 _windows_reserved_filenames = '''con prn aux nul
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54 com1 com2 com3 com4 com5 com6 com7 com8 com9
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55 lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9'''.split()
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56 def auxencode(path):
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57 res = []
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58 for n in path.split('/'):
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59 if n:
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60 base = n.split('.')[0]
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61 if base and (base in _windows_reserved_filenames):
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62 # encode third letter ('aux' -> 'au~78')
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63 ec = "~%02x" % ord(n[2])
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64 n = n[0:2] + ec + n[3:]
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65 if n[-1] in '. ':
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66 # encode last period or space ('foo...' -> 'foo..~2e')
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67 n = n[:-1] + "~%02x" % ord(n[-1])
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68 res.append(n)
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69 return '/'.join(res)
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70
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71 MAX_PATH_LEN_IN_HGSTORE = 120
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72 DIR_PREFIX_LEN = 8
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73 _MAX_SHORTENED_DIRS_LEN = 8 * (DIR_PREFIX_LEN + 1) - 4
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74 def hybridencode(path):
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75 '''encodes path with a length limit
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76
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77 Encodes all paths that begin with 'data/', according to the following.
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78
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79 Default encoding (reversible):
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80
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81 Encodes all uppercase letters 'X' as '_x'. All reserved or illegal
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82 characters are encoded as '~xx', where xx is the two digit hex code
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83 of the character (see encodefilename).
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84 Relevant path components consisting of Windows reserved filenames are
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85 masked by encoding the third character ('aux' -> 'au~78', see auxencode).
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86
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87 Hashed encoding (not reversible):
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88
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89 If the default-encoded path is longer than MAX_PATH_LEN_IN_HGSTORE, a
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90 non-reversible hybrid hashing of the path is done instead.
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91 This encoding uses up to DIR_PREFIX_LEN characters of all directory
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92 levels of the lowerencoded path, but not more levels than can fit into
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93 _MAX_SHORTENED_DIRS_LEN.
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94 Then follows the filler followed by the sha digest of the full path.
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95 The filler is the beginning of the basename of the lowerencoded path
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96 (the basename is everything after the last path separator). The filler
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97 is as long as possible, filling in characters from the basename until
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98 the encoded path has MAX_PATH_LEN_IN_HGSTORE characters (or all chars
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99 of the basename have been taken).
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100 The extension (e.g. '.i' or '.d') is preserved.
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101
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102 The string 'data/' at the beginning is replaced with 'dh/', if the hashed
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103 encoding was used.
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104 '''
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105 if not path.startswith('data/'):
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106 return path
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107 ndpath = path[len('data/'):]
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108 res = 'data/' + auxencode(encodefilename(ndpath))
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109 if len(res) > MAX_PATH_LEN_IN_HGSTORE:
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110 digest = _sha(path).hexdigest()
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111 aep = auxencode(lowerencode(ndpath))
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112 _root, ext = os.path.splitext(aep)
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113 parts = aep.split('/')
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114 basename = parts[-1]
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115 sdirs = []
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116 for p in parts[:-1]:
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117 d = p[:DIR_PREFIX_LEN]
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118 if d[-1] in '. ':
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119 # Windows can't access dirs ending in period or space
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120 d = d[:-1] + '_'
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121 t = '/'.join(sdirs) + '/' + d
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122 if len(t) > _MAX_SHORTENED_DIRS_LEN:
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123 break
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124 sdirs.append(d)
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125 dirs = '/'.join(sdirs)
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126 if len(dirs) > 0:
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127 dirs += '/'
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128 res = 'dh/' + dirs + digest + ext
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129 space_left = MAX_PATH_LEN_IN_HGSTORE - len(res)
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130 if space_left > 0:
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131 filler = basename[:space_left]
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132 res = 'dh/' + dirs + filler + digest + ext
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133 return res
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134
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135 def _calcmode(path):
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136 try:
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137 # files in .hg/ will be created using this mode
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138 mode = os.stat(path).st_mode
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diff changeset
139 # avoid some useless chmods
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140 if (0777 & ~util.umask) == (0777 & mode):
6898
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diff changeset
141 mode = None
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diff changeset
142 except OSError:
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diff changeset
143 mode = None
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diff changeset
144 return mode
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diff changeset
145
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diff changeset
146 _data = 'data 00manifest.d 00manifest.i 00changelog.d 00changelog.i'
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diff changeset
147
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148 class basicstore:
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149 '''base class for local repository stores'''
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150 def __init__(self, path, opener, pathjoiner):
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151 self.pathjoiner = pathjoiner
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diff changeset
152 self.path = path
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diff changeset
153 self.createmode = _calcmode(path)
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diff changeset
154 self.opener = opener(self.path)
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diff changeset
155 self.opener.createmode = self.createmode
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156
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diff changeset
157 def join(self, f):
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diff changeset
158 return self.pathjoiner(self.path, f)
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159
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160 def _walk(self, relpath, recurse):
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161 '''yields (unencoded, encoded, size)'''
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parents: 6903
diff changeset
162 path = self.pathjoiner(self.path, relpath)
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163 striplen = len(self.path) + len(os.sep)
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parents: 6898
diff changeset
164 l = []
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parents: 6898
diff changeset
165 if os.path.isdir(path):
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parents: 6898
diff changeset
166 visit = [path]
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parents: 6898
diff changeset
167 while visit:
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parents: 6898
diff changeset
168 p = visit.pop()
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parents: 6898
diff changeset
169 for f, kind, st in osutil.listdir(p, stat=True):
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parents: 6903
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170 fp = self.pathjoiner(p, f)
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diff changeset
171 if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'):
6900
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diff changeset
172 n = util.pconvert(fp[striplen:])
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173 l.append((n, n, st.st_size))
6899
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diff changeset
174 elif kind == stat.S_IFDIR and recurse:
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diff changeset
175 visit.append(fp)
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a1a5a57efe90 replace util.sort with sorted built-in
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176 return sorted(l)
6840
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177
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178 def datafiles(self):
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179 return self._walk('data', True)
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180
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181 def walk(self):
6900
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182 '''yields (unencoded, encoded, size)'''
6840
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183 # yield data files first
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184 for x in self.datafiles():
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diff changeset
185 yield x
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diff changeset
186 # yield manifest before changelog
8210
344751cd8cb8 replace various uses of list.reverse()
Matt Mackall <mpm@selenic.com>
parents: 8209
diff changeset
187 for x in reversed(self._walk('', False)):
6840
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diff changeset
188 yield x
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diff changeset
189
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diff changeset
190 def copylist(self):
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parents: 6902
diff changeset
191 return ['requires'] + _data.split()
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parents: 6902
diff changeset
192
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diff changeset
193 class encodedstore(basicstore):
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194 def __init__(self, path, opener, pathjoiner):
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diff changeset
195 self.pathjoiner = pathjoiner
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diff changeset
196 self.path = self.pathjoiner(path, 'store')
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diff changeset
197 self.createmode = _calcmode(self.path)
6896
40690d614ce6 store: take opener as an argument
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parents: 6892
diff changeset
198 op = opener(self.path)
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diff changeset
199 op.createmode = self.createmode
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93f761c25dea store: drop self.encodefn
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parents: 6900
diff changeset
200 self.opener = lambda f, *args, **kw: op(encodefilename(f), *args, **kw)
6840
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201
6900
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diff changeset
202 def datafiles(self):
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diff changeset
203 for a, b, size in self._walk('data', True):
6892
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diff changeset
204 try:
6900
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parents: 6899
diff changeset
205 a = decodefilename(a)
6892
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parents: 6890
diff changeset
206 except KeyError:
6900
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diff changeset
207 a = None
def492d1b592 store: change handling of decoding errors
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parents: 6899
diff changeset
208 yield a, b, size
6840
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diff changeset
209
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diff changeset
210 def join(self, f):
6988
907e4e9bd3c4 Fix for Issue1260
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parents: 6903
diff changeset
211 return self.pathjoiner(self.path, encodefilename(f))
6840
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diff changeset
212
6903
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diff changeset
213 def copylist(self):
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parents: 6902
diff changeset
214 return (['requires', '00changelog.i'] +
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907e4e9bd3c4 Fix for Issue1260
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parents: 6903
diff changeset
215 [self.pathjoiner('store', f) for f in _data.split()])
6903
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parents: 6902
diff changeset
216
7229
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diff changeset
217 def fncache(opener):
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diff changeset
218 '''yields the entries in the fncache file'''
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diff changeset
219 try:
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diff changeset
220 fp = opener('fncache', mode='rb')
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parents: 6989
diff changeset
221 except IOError:
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parents: 6989
diff changeset
222 # skip nonexistent file
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parents: 6989
diff changeset
223 return
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parents: 6989
diff changeset
224 for n, line in enumerate(fp):
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parents: 6989
diff changeset
225 if (len(line) < 2) or (line[-1] != '\n'):
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parents: 6989
diff changeset
226 t = _('invalid entry in fncache, line %s') % (n + 1)
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parents: 6989
diff changeset
227 raise util.Abort(t)
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parents: 6989
diff changeset
228 yield line[:-1]
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diff changeset
229 fp.close()
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parents: 6989
diff changeset
230
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diff changeset
231 class fncacheopener(object):
7946503ec76e introduce fncache repository layout
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diff changeset
232 def __init__(self, opener):
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diff changeset
233 self.opener = opener
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diff changeset
234 self.entries = None
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parents: 6989
diff changeset
235
7946503ec76e introduce fncache repository layout
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parents: 6989
diff changeset
236 def loadfncache(self):
8480
0e91bcaaa92c store: create set directly from iterable
Martin Geisler <mg@lazybytes.net>
parents: 8467
diff changeset
237 self.entries = set(fncache(self.opener))
7229
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diff changeset
238
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parents: 6989
diff changeset
239 def __call__(self, path, mode='r', *args, **kw):
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parents: 6989
diff changeset
240 if mode not in ('r', 'rb') and path.startswith('data/'):
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parents: 6989
diff changeset
241 if self.entries is None:
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parents: 6989
diff changeset
242 self.loadfncache()
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parents: 6989
diff changeset
243 if path not in self.entries:
7946503ec76e introduce fncache repository layout
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parents: 6989
diff changeset
244 self.opener('fncache', 'ab').write(path + '\n')
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parents: 6989
diff changeset
245 # fncache may contain non-existent files after rollback / strip
8467
9890151a7f30 store: use set instead of dict
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 8312
diff changeset
246 self.entries.add(path)
7229
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diff changeset
247 return self.opener(hybridencode(path), mode, *args, **kw)
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diff changeset
248
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diff changeset
249 class fncachestore(basicstore):
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parents: 6989
diff changeset
250 def __init__(self, path, opener, pathjoiner):
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parents: 6989
diff changeset
251 self.pathjoiner = pathjoiner
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parents: 6989
diff changeset
252 self.path = self.pathjoiner(path, 'store')
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parents: 6989
diff changeset
253 self.createmode = _calcmode(self.path)
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parents: 6989
diff changeset
254 self._op = opener(self.path)
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parents: 6989
diff changeset
255 self._op.createmode = self.createmode
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diff changeset
256 self.opener = fncacheopener(self._op)
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parents: 6989
diff changeset
257
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diff changeset
258 def join(self, f):
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parents: 6989
diff changeset
259 return self.pathjoiner(self.path, hybridencode(f))
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parents: 6989
diff changeset
260
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diff changeset
261 def datafiles(self):
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diff changeset
262 rewrite = False
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parents: 6989
diff changeset
263 existing = []
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parents: 6989
diff changeset
264 pjoin = self.pathjoiner
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diff changeset
265 spath = self.path
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parents: 6989
diff changeset
266 for f in fncache(self._op):
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parents: 6989
diff changeset
267 ef = hybridencode(f)
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parents: 6989
diff changeset
268 try:
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parents: 6989
diff changeset
269 st = os.stat(pjoin(spath, ef))
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parents: 6989
diff changeset
270 yield f, ef, st.st_size
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parents: 6989
diff changeset
271 existing.append(f)
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parents: 6989
diff changeset
272 except OSError:
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parents: 6989
diff changeset
273 # nonexistent entry
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parents: 6989
diff changeset
274 rewrite = True
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parents: 6989
diff changeset
275 if rewrite:
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parents: 6989
diff changeset
276 # rewrite fncache to remove nonexistent entries
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diff changeset
277 # (may be caused by rollback / strip)
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parents: 6989
diff changeset
278 fp = self._op('fncache', mode='wb')
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diff changeset
279 for p in existing:
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parents: 6989
diff changeset
280 fp.write(p + '\n')
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diff changeset
281 fp.close()
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diff changeset
282
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diff changeset
283 def copylist(self):
7236
db6fbb785800 Remove trailing spaces.
Thomas Arendsen Hein <thomas@intevation.de>
parents: 7229
diff changeset
284 d = _data + ' dh fncache'
7229
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diff changeset
285 return (['requires', '00changelog.i'] +
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diff changeset
286 [self.pathjoiner('store', f) for f in d.split()])
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Adrian Buehlmann <adrian@cadifra.com>
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287
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32e68ffccbc5 store: pathjoiner default value is os.path.join
Patrick Mezard <pmezard@gmail.com>
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288 def store(requirements, path, opener, pathjoiner=None):
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Patrick Mezard <pmezard@gmail.com>
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289 pathjoiner = pathjoiner or os.path.join
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Matt Mackall <mpm@selenic.com>
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290 if 'store' in requirements:
7229
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Adrian Buehlmann <adrian@cadifra.com>
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291 if 'fncache' in requirements:
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Adrian Buehlmann <adrian@cadifra.com>
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292 return fncachestore(path, opener, pathjoiner)
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Adrian Buehlmann <adrian@cadifra.com>
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293 return encodedstore(path, opener, pathjoiner)
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Adrian Buehlmann <adrian@cadifra.com>
parents: 6903
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294 return basicstore(path, opener, pathjoiner)