Mercurial > hg
annotate hgext/remotefilelog/basepack.py @ 41918:5d9fdc9b0178
setup: include hgext3rd package in py2exe builds
This is a core Mercurial package and we should always ship it.
Differential Revision: https://phab.mercurial-scm.org/D6094
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 07 Mar 2019 14:02:02 -0800 |
parents | 876494fd967d |
children | 2372284d9457 |
rev | line source |
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1 from __future__ import absolute_import |
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2 |
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3 import collections |
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4 import errno |
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5 import hashlib |
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6 import mmap |
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7 import os |
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8 import struct |
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9 import time |
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10 |
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11 from mercurial.i18n import _ |
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12 from mercurial import ( |
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13 node as nodemod, |
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14 policy, |
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15 pycompat, |
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16 util, |
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17 vfs as vfsmod, |
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18 ) |
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19 from . import shallowutil |
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20 |
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21 osutil = policy.importmod(r'osutil') |
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22 |
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23 # The pack version supported by this implementation. This will need to be |
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24 # rev'd whenever the byte format changes. Ex: changing the fanout prefix, |
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25 # changing any of the int sizes, changing the delta algorithm, etc. |
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26 PACKVERSIONSIZE = 1 |
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27 INDEXVERSIONSIZE = 2 |
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28 |
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29 FANOUTSTART = INDEXVERSIONSIZE |
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30 |
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31 # Constant that indicates a fanout table entry hasn't been filled in. (This does |
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32 # not get serialized) |
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33 EMPTYFANOUT = -1 |
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34 |
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35 # The fanout prefix is the number of bytes that can be addressed by the fanout |
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36 # table. Example: a fanout prefix of 1 means we use the first byte of a hash to |
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37 # look in the fanout table (which will be 2^8 entries long). |
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38 SMALLFANOUTPREFIX = 1 |
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39 LARGEFANOUTPREFIX = 2 |
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40 |
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41 # The number of entries in the index at which point we switch to a large fanout. |
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42 # It is chosen to balance the linear scan through a sparse fanout, with the |
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43 # size of the bisect in actual index. |
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44 # 2^16 / 8 was chosen because it trades off (1 step fanout scan + 5 step |
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45 # bisect) with (8 step fanout scan + 1 step bisect) |
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46 # 5 step bisect = log(2^16 / 8 / 255) # fanout |
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47 # 10 step fanout scan = 2^16 / (2^16 / 8) # fanout space divided by entries |
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48 SMALLFANOUTCUTOFF = 2**16 // 8 |
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49 |
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50 # The amount of time to wait between checking for new packs. This prevents an |
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51 # exception when data is moved to a new pack after the process has already |
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52 # loaded the pack list. |
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53 REFRESHRATE = 0.1 |
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54 |
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55 if pycompat.isposix and not pycompat.ispy3: |
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56 # With glibc 2.7+ the 'e' flag uses O_CLOEXEC when opening. |
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57 # The 'e' flag will be ignored on older versions of glibc. |
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58 # Python 3 can't handle the 'e' flag. |
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59 PACKOPENMODE = 'rbe' |
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60 else: |
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61 PACKOPENMODE = 'rb' |
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62 |
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63 class _cachebackedpacks(object): |
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64 def __init__(self, packs, cachesize): |
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65 self._packs = set(packs) |
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66 self._lrucache = util.lrucachedict(cachesize) |
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67 self._lastpack = None |
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68 |
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69 # Avoid cold start of the cache by populating the most recent packs |
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70 # in the cache. |
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71 for i in reversed(range(min(cachesize, len(packs)))): |
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72 self._movetofront(packs[i]) |
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73 |
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74 def _movetofront(self, pack): |
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75 # This effectively makes pack the first entry in the cache. |
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76 self._lrucache[pack] = True |
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77 |
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78 def _registerlastpackusage(self): |
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79 if self._lastpack is not None: |
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80 self._movetofront(self._lastpack) |
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81 self._lastpack = None |
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82 |
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83 def add(self, pack): |
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84 self._registerlastpackusage() |
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85 |
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86 # This method will mostly be called when packs are not in cache. |
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87 # Therefore, adding pack to the cache. |
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88 self._movetofront(pack) |
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89 self._packs.add(pack) |
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90 |
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91 def __iter__(self): |
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92 self._registerlastpackusage() |
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93 |
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94 # Cache iteration is based on LRU. |
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95 for pack in self._lrucache: |
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96 self._lastpack = pack |
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97 yield pack |
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98 |
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99 cachedpacks = set(pack for pack in self._lrucache) |
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100 # Yield for paths not in the cache. |
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101 for pack in self._packs - cachedpacks: |
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102 self._lastpack = pack |
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103 yield pack |
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104 |
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105 # Data not found in any pack. |
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106 self._lastpack = None |
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107 |
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108 class basepackstore(object): |
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109 # Default cache size limit for the pack files. |
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110 DEFAULTCACHESIZE = 100 |
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111 |
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112 def __init__(self, ui, path): |
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113 self.ui = ui |
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114 self.path = path |
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115 |
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116 # lastrefesh is 0 so we'll immediately check for new packs on the first |
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117 # failure. |
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118 self.lastrefresh = 0 |
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119 |
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120 packs = [] |
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121 for filepath, __, __ in self._getavailablepackfilessorted(): |
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122 try: |
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123 pack = self.getpack(filepath) |
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124 except Exception as ex: |
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125 # An exception may be thrown if the pack file is corrupted |
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126 # somehow. Log a warning but keep going in this case, just |
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127 # skipping this pack file. |
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128 # |
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129 # If this is an ENOENT error then don't even bother logging. |
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130 # Someone could have removed the file since we retrieved the |
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131 # list of paths. |
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132 if getattr(ex, 'errno', None) != errno.ENOENT: |
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133 ui.warn(_('unable to load pack %s: %s\n') % (filepath, ex)) |
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134 continue |
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135 packs.append(pack) |
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136 |
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137 self.packs = _cachebackedpacks(packs, self.DEFAULTCACHESIZE) |
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138 |
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139 def _getavailablepackfiles(self): |
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140 """For each pack file (a index/data file combo), yields: |
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141 (full path without extension, mtime, size) |
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142 |
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143 mtime will be the mtime of the index/data file (whichever is newer) |
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144 size is the combined size of index/data file |
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145 """ |
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146 indexsuffixlen = len(self.INDEXSUFFIX) |
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147 packsuffixlen = len(self.PACKSUFFIX) |
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148 |
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149 ids = set() |
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150 sizes = collections.defaultdict(lambda: 0) |
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151 mtimes = collections.defaultdict(lambda: []) |
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152 try: |
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153 for filename, type, stat in osutil.listdir(self.path, stat=True): |
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154 id = None |
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155 if filename[-indexsuffixlen:] == self.INDEXSUFFIX: |
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156 id = filename[:-indexsuffixlen] |
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157 elif filename[-packsuffixlen:] == self.PACKSUFFIX: |
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158 id = filename[:-packsuffixlen] |
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159 |
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160 # Since we expect to have two files corresponding to each ID |
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161 # (the index file and the pack file), we can yield once we see |
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162 # it twice. |
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163 if id: |
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164 sizes[id] += stat.st_size # Sum both files' sizes together |
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165 mtimes[id].append(stat.st_mtime) |
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166 if id in ids: |
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167 yield (os.path.join(self.path, id), max(mtimes[id]), |
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168 sizes[id]) |
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169 else: |
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170 ids.add(id) |
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171 except OSError as ex: |
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172 if ex.errno != errno.ENOENT: |
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173 raise |
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174 |
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175 def _getavailablepackfilessorted(self): |
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176 """Like `_getavailablepackfiles`, but also sorts the files by mtime, |
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177 yielding newest files first. |
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178 |
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179 This is desirable, since it is more likely newer packfiles have more |
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180 desirable data. |
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181 """ |
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182 files = [] |
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183 for path, mtime, size in self._getavailablepackfiles(): |
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184 files.append((mtime, size, path)) |
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185 files = sorted(files, reverse=True) |
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186 for mtime, size, path in files: |
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187 yield path, mtime, size |
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188 |
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189 def gettotalsizeandcount(self): |
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190 """Returns the total disk size (in bytes) of all the pack files in |
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191 this store, and the count of pack files. |
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192 |
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193 (This might be smaller than the total size of the ``self.path`` |
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194 directory, since this only considers fuly-writen pack files, and not |
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195 temporary files or other detritus on the directory.) |
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196 """ |
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197 totalsize = 0 |
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198 count = 0 |
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199 for __, __, size in self._getavailablepackfiles(): |
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200 totalsize += size |
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201 count += 1 |
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202 return totalsize, count |
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203 |
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204 def getmetrics(self): |
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205 """Returns metrics on the state of this store.""" |
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206 size, count = self.gettotalsizeandcount() |
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207 return { |
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208 'numpacks': count, |
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209 'totalpacksize': size, |
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210 } |
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211 |
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212 def getpack(self, path): |
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213 raise NotImplementedError() |
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214 |
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215 def getmissing(self, keys): |
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216 missing = keys |
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217 for pack in self.packs: |
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218 missing = pack.getmissing(missing) |
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219 |
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220 # Ensures better performance of the cache by keeping the most |
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221 # recently accessed pack at the beginning in subsequent iterations. |
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222 if not missing: |
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223 return missing |
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224 |
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225 if missing: |
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226 for pack in self.refresh(): |
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227 missing = pack.getmissing(missing) |
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228 |
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229 return missing |
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230 |
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231 def markledger(self, ledger, options=None): |
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232 for pack in self.packs: |
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233 pack.markledger(ledger) |
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234 |
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235 def markforrefresh(self): |
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236 """Tells the store that there may be new pack files, so the next time it |
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237 has a lookup miss it should check for new files.""" |
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238 self.lastrefresh = 0 |
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239 |
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240 def refresh(self): |
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241 """Checks for any new packs on disk, adds them to the main pack list, |
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242 and returns a list of just the new packs.""" |
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243 now = time.time() |
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244 |
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245 # If we experience a lot of misses (like in the case of getmissing() on |
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246 # new objects), let's only actually check disk for new stuff every once |
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247 # in a while. Generally this code path should only ever matter when a |
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248 # repack is going on in the background, and that should be pretty rare |
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249 # to have that happen twice in quick succession. |
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250 newpacks = [] |
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251 if now > self.lastrefresh + REFRESHRATE: |
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252 self.lastrefresh = now |
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253 previous = set(p.path for p in self.packs) |
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254 for filepath, __, __ in self._getavailablepackfilessorted(): |
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255 if filepath not in previous: |
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256 newpack = self.getpack(filepath) |
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257 newpacks.append(newpack) |
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258 self.packs.add(newpack) |
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259 |
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260 return newpacks |
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261 |
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262 class versionmixin(object): |
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263 # Mix-in for classes with multiple supported versions |
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264 VERSION = None |
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265 SUPPORTED_VERSIONS = [2] |
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266 |
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267 def _checkversion(self, version): |
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268 if version in self.SUPPORTED_VERSIONS: |
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269 if self.VERSION is None: |
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270 # only affect this instance |
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271 self.VERSION = version |
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272 elif self.VERSION != version: |
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273 raise RuntimeError('inconsistent version: %d' % version) |
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274 else: |
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275 raise RuntimeError('unsupported version: %d' % version) |
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276 |
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277 class basepack(versionmixin): |
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278 # The maximum amount we should read via mmap before remmaping so the old |
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279 # pages can be released (100MB) |
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280 MAXPAGEDIN = 100 * 1024**2 |
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281 |
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282 SUPPORTED_VERSIONS = [2] |
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283 |
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284 def __init__(self, path): |
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285 self.path = path |
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286 self.packpath = path + self.PACKSUFFIX |
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287 self.indexpath = path + self.INDEXSUFFIX |
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288 |
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289 self.indexsize = os.stat(self.indexpath).st_size |
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290 self.datasize = os.stat(self.packpath).st_size |
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291 |
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292 self._index = None |
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293 self._data = None |
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294 self.freememory() # initialize the mmap |
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295 |
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296 version = struct.unpack('!B', self._data[:PACKVERSIONSIZE])[0] |
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297 self._checkversion(version) |
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298 |
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299 version, config = struct.unpack('!BB', self._index[:INDEXVERSIONSIZE]) |
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300 self._checkversion(version) |
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301 |
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302 if 0b10000000 & config: |
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303 self.params = indexparams(LARGEFANOUTPREFIX, version) |
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304 else: |
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305 self.params = indexparams(SMALLFANOUTPREFIX, version) |
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306 |
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307 @util.propertycache |
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308 def _fanouttable(self): |
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309 params = self.params |
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310 rawfanout = self._index[FANOUTSTART:FANOUTSTART + params.fanoutsize] |
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311 fanouttable = [] |
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312 for i in pycompat.xrange(0, params.fanoutcount): |
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313 loc = i * 4 |
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314 fanoutentry = struct.unpack('!I', rawfanout[loc:loc + 4])[0] |
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315 fanouttable.append(fanoutentry) |
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316 return fanouttable |
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317 |
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318 @util.propertycache |
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319 def _indexend(self): |
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320 nodecount = struct.unpack_from('!Q', self._index, |
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321 self.params.indexstart - 8)[0] |
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322 return self.params.indexstart + nodecount * self.INDEXENTRYLENGTH |
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323 |
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324 def freememory(self): |
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325 """Unmap and remap the memory to free it up after known expensive |
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326 operations. Return True if self._data and self._index were reloaded. |
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327 """ |
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328 if self._index: |
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329 if self._pagedin < self.MAXPAGEDIN: |
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330 return False |
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331 |
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332 self._index.close() |
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333 self._data.close() |
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334 |
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335 # TODO: use an opener/vfs to access these paths |
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336 with open(self.indexpath, PACKOPENMODE) as indexfp: |
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337 # memory-map the file, size 0 means whole file |
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338 self._index = mmap.mmap(indexfp.fileno(), 0, |
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339 access=mmap.ACCESS_READ) |
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340 with open(self.packpath, PACKOPENMODE) as datafp: |
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341 self._data = mmap.mmap(datafp.fileno(), 0, access=mmap.ACCESS_READ) |
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342 |
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343 self._pagedin = 0 |
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344 return True |
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345 |
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346 def getmissing(self, keys): |
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347 raise NotImplementedError() |
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348 |
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349 def markledger(self, ledger, options=None): |
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350 raise NotImplementedError() |
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351 |
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352 def cleanup(self, ledger): |
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353 raise NotImplementedError() |
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354 |
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355 def __iter__(self): |
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356 raise NotImplementedError() |
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357 |
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358 def iterentries(self): |
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359 raise NotImplementedError() |
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360 |
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361 class mutablebasepack(versionmixin): |
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362 |
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363 def __init__(self, ui, packdir, version=2): |
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364 self._checkversion(version) |
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365 # TODO(augie): make this configurable |
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366 self._compressor = 'GZ' |
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367 opener = vfsmod.vfs(packdir) |
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368 opener.createmode = 0o444 |
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369 self.opener = opener |
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370 |
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371 self.entries = {} |
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372 |
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373 shallowutil.mkstickygroupdir(ui, packdir) |
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374 self.packfp, self.packpath = opener.mkstemp( |
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375 suffix=self.PACKSUFFIX + '-tmp') |
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376 self.idxfp, self.idxpath = opener.mkstemp( |
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377 suffix=self.INDEXSUFFIX + '-tmp') |
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378 self.packfp = os.fdopen(self.packfp, r'wb+') |
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379 self.idxfp = os.fdopen(self.idxfp, r'wb+') |
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380 self.sha = hashlib.sha1() |
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381 self._closed = False |
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382 |
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383 # The opener provides no way of doing permission fixup on files created |
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384 # via mkstemp, so we must fix it ourselves. We can probably fix this |
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385 # upstream in vfs.mkstemp so we don't need to use the private method. |
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386 opener._fixfilemode(opener.join(self.packpath)) |
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387 opener._fixfilemode(opener.join(self.idxpath)) |
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388 |
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389 # Write header |
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390 # TODO: make it extensible (ex: allow specifying compression algorithm, |
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391 # a flexible key/value header, delta algorithm, fanout size, etc) |
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392 versionbuf = struct.pack('!B', self.VERSION) # unsigned 1 byte int |
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393 self.writeraw(versionbuf) |
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394 |
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395 def __enter__(self): |
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396 return self |
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397 |
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398 def __exit__(self, exc_type, exc_value, traceback): |
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399 if exc_type is None: |
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400 self.close() |
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401 else: |
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402 self.abort() |
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403 |
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404 def abort(self): |
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405 # Unclean exit |
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406 self._cleantemppacks() |
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407 |
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408 def writeraw(self, data): |
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409 self.packfp.write(data) |
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410 self.sha.update(data) |
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411 |
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412 def close(self, ledger=None): |
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413 if self._closed: |
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414 return |
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415 |
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416 try: |
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417 sha = nodemod.hex(self.sha.digest()) |
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418 self.packfp.close() |
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419 self.writeindex() |
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420 |
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421 if len(self.entries) == 0: |
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422 # Empty pack |
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423 self._cleantemppacks() |
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424 self._closed = True |
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425 return None |
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426 |
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427 self.opener.rename(self.packpath, sha + self.PACKSUFFIX) |
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428 try: |
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429 self.opener.rename(self.idxpath, sha + self.INDEXSUFFIX) |
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430 except Exception as ex: |
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431 try: |
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432 self.opener.unlink(sha + self.PACKSUFFIX) |
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433 except Exception: |
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434 pass |
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435 # Throw exception 'ex' explicitly since a normal 'raise' would |
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436 # potentially throw an exception from the unlink cleanup. |
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437 raise ex |
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438 except Exception: |
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439 # Clean up temp packs in all exception cases |
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440 self._cleantemppacks() |
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441 raise |
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442 |
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443 self._closed = True |
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444 result = self.opener.join(sha) |
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445 if ledger: |
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446 ledger.addcreated(result) |
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447 return result |
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448 |
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449 def _cleantemppacks(self): |
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450 try: |
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451 self.opener.unlink(self.packpath) |
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452 except Exception: |
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453 pass |
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454 try: |
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455 self.opener.unlink(self.idxpath) |
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456 except Exception: |
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457 pass |
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458 |
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459 def writeindex(self): |
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460 largefanout = len(self.entries) > SMALLFANOUTCUTOFF |
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461 if largefanout: |
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462 params = indexparams(LARGEFANOUTPREFIX, self.VERSION) |
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463 else: |
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464 params = indexparams(SMALLFANOUTPREFIX, self.VERSION) |
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465 |
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466 fanouttable = [EMPTYFANOUT] * params.fanoutcount |
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467 |
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468 # Precompute the location of each entry |
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469 locations = {} |
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470 count = 0 |
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471 for node in sorted(self.entries): |
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472 location = count * self.INDEXENTRYLENGTH |
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473 locations[node] = location |
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474 count += 1 |
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|
475 |
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476 # Must use [0] on the unpack result since it's always a tuple. |
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477 fanoutkey = struct.unpack(params.fanoutstruct, |
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478 node[:params.fanoutprefix])[0] |
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479 if fanouttable[fanoutkey] == EMPTYFANOUT: |
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480 fanouttable[fanoutkey] = location |
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|
481 |
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482 rawfanouttable = '' |
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483 last = 0 |
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484 for offset in fanouttable: |
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485 offset = offset if offset != EMPTYFANOUT else last |
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486 last = offset |
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487 rawfanouttable += struct.pack('!I', offset) |
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changeset
|
488 |
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489 rawentrieslength = struct.pack('!Q', len(self.entries)) |
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changeset
|
490 |
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parents:
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changeset
|
491 # The index offset is the it's location in the file. So after the 2 byte |
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|
492 # header and the fanouttable. |
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|
493 rawindex = self.createindex(locations, 2 + len(rawfanouttable)) |
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|
494 |
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changeset
|
495 self._writeheader(params) |
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|
496 self.idxfp.write(rawfanouttable) |
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|
497 self.idxfp.write(rawentrieslength) |
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498 self.idxfp.write(rawindex) |
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|
499 self.idxfp.close() |
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|
500 |
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|
501 def createindex(self, nodelocations): |
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502 raise NotImplementedError() |
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|
503 |
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|
504 def _writeheader(self, indexparams): |
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|
505 # Index header |
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|
506 # <version: 1 byte> |
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|
507 # <large fanout: 1 bit> # 1 means 2^16, 0 means 2^8 |
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|
508 # <unused: 7 bit> # future use (compression, delta format, etc) |
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|
509 config = 0 |
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|
510 if indexparams.fanoutprefix == LARGEFANOUTPREFIX: |
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|
511 config = 0b10000000 |
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|
512 self.idxfp.write(struct.pack('!BB', self.VERSION, config)) |
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|
513 |
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|
514 class indexparams(object): |
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515 __slots__ = (r'fanoutprefix', r'fanoutstruct', r'fanoutcount', |
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516 r'fanoutsize', r'indexstart') |
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|
517 |
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|
518 def __init__(self, prefixsize, version): |
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519 self.fanoutprefix = prefixsize |
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|
520 |
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|
521 # The struct pack format for fanout table location (i.e. the format that |
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|
522 # converts the node prefix into an integer location in the fanout |
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|
523 # table). |
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|
524 if prefixsize == SMALLFANOUTPREFIX: |
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|
525 self.fanoutstruct = '!B' |
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526 elif prefixsize == LARGEFANOUTPREFIX: |
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527 self.fanoutstruct = '!H' |
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528 else: |
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|
529 raise ValueError("invalid fanout prefix size: %s" % prefixsize) |
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|
530 |
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|
531 # The number of fanout table entries |
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|
532 self.fanoutcount = 2**(prefixsize * 8) |
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|
533 |
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|
534 # The total bytes used by the fanout table |
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|
535 self.fanoutsize = self.fanoutcount * 4 |
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|
536 |
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|
537 self.indexstart = FANOUTSTART + self.fanoutsize |
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538 # Skip the index length |
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|
539 self.indexstart += 8 |