Mercurial > hg
annotate hgext/remotefilelog/basepack.py @ 41098:cfd95219102d
strip: move attributes shortcut assigned earlier
This series will add support for "soft" stripping using the archived phase in
addition to the usual heavy weight revlog stripping. First, we need to
refactor the strip function to extract logic common to the "soft-strip" case.
We are about to extract bits of the strip function into separate functions.
Those blocks of code contain variables for frequently accessed attributes. We
move those variables outside of the soon to be moved blocks.
author | Boris Feld <boris.feld@octobus.net> |
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date | Wed, 02 Jan 2019 05:02:25 +0100 |
parents | e0b485a76009 |
children | c891a11ffe27 |
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: |
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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 PACKOPENMODE = 'rbe' |
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59 else: |
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60 PACKOPENMODE = 'rb' |
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61 |
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62 class _cachebackedpacks(object): |
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63 def __init__(self, packs, cachesize): |
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64 self._packs = set(packs) |
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65 self._lrucache = util.lrucachedict(cachesize) |
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66 self._lastpack = None |
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67 |
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68 # Avoid cold start of the cache by populating the most recent packs |
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69 # in the cache. |
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70 for i in reversed(range(min(cachesize, len(packs)))): |
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71 self._movetofront(packs[i]) |
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72 |
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73 def _movetofront(self, pack): |
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74 # This effectively makes pack the first entry in the cache. |
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75 self._lrucache[pack] = True |
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76 |
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77 def _registerlastpackusage(self): |
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78 if self._lastpack is not None: |
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79 self._movetofront(self._lastpack) |
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80 self._lastpack = None |
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81 |
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82 def add(self, pack): |
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83 self._registerlastpackusage() |
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84 |
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85 # This method will mostly be called when packs are not in cache. |
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86 # Therefore, adding pack to the cache. |
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87 self._movetofront(pack) |
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88 self._packs.add(pack) |
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89 |
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90 def __iter__(self): |
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91 self._registerlastpackusage() |
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92 |
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93 # Cache iteration is based on LRU. |
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94 for pack in self._lrucache: |
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95 self._lastpack = pack |
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96 yield pack |
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97 |
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98 cachedpacks = set(pack for pack in self._lrucache) |
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99 # Yield for paths not in the cache. |
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100 for pack in self._packs - cachedpacks: |
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101 self._lastpack = pack |
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102 yield pack |
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103 |
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104 # Data not found in any pack. |
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105 self._lastpack = None |
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106 |
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107 class basepackstore(object): |
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108 # Default cache size limit for the pack files. |
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109 DEFAULTCACHESIZE = 100 |
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110 |
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111 def __init__(self, ui, path): |
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112 self.ui = ui |
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113 self.path = path |
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114 |
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115 # lastrefesh is 0 so we'll immediately check for new packs on the first |
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116 # failure. |
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117 self.lastrefresh = 0 |
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118 |
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119 packs = [] |
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120 for filepath, __, __ in self._getavailablepackfilessorted(): |
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121 try: |
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122 pack = self.getpack(filepath) |
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123 except Exception as ex: |
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124 # An exception may be thrown if the pack file is corrupted |
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125 # somehow. Log a warning but keep going in this case, just |
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126 # skipping this pack file. |
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127 # |
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128 # If this is an ENOENT error then don't even bother logging. |
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129 # Someone could have removed the file since we retrieved the |
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130 # list of paths. |
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131 if getattr(ex, 'errno', None) != errno.ENOENT: |
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132 ui.warn(_('unable to load pack %s: %s\n') % (filepath, ex)) |
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133 continue |
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134 packs.append(pack) |
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135 |
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136 self.packs = _cachebackedpacks(packs, self.DEFAULTCACHESIZE) |
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137 |
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138 def _getavailablepackfiles(self): |
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139 """For each pack file (a index/data file combo), yields: |
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140 (full path without extension, mtime, size) |
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141 |
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142 mtime will be the mtime of the index/data file (whichever is newer) |
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143 size is the combined size of index/data file |
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144 """ |
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145 indexsuffixlen = len(self.INDEXSUFFIX) |
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146 packsuffixlen = len(self.PACKSUFFIX) |
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147 |
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148 ids = set() |
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149 sizes = collections.defaultdict(lambda: 0) |
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150 mtimes = collections.defaultdict(lambda: []) |
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151 try: |
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152 for filename, type, stat in osutil.listdir(self.path, stat=True): |
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153 id = None |
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154 if filename[-indexsuffixlen:] == self.INDEXSUFFIX: |
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155 id = filename[:-indexsuffixlen] |
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156 elif filename[-packsuffixlen:] == self.PACKSUFFIX: |
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157 id = filename[:-packsuffixlen] |
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158 |
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159 # Since we expect to have two files corresponding to each ID |
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160 # (the index file and the pack file), we can yield once we see |
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161 # it twice. |
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162 if id: |
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163 sizes[id] += stat.st_size # Sum both files' sizes together |
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164 mtimes[id].append(stat.st_mtime) |
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165 if id in ids: |
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166 yield (os.path.join(self.path, id), max(mtimes[id]), |
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167 sizes[id]) |
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168 else: |
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169 ids.add(id) |
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170 except OSError as ex: |
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171 if ex.errno != errno.ENOENT: |
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172 raise |
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173 |
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174 def _getavailablepackfilessorted(self): |
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175 """Like `_getavailablepackfiles`, but also sorts the files by mtime, |
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176 yielding newest files first. |
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177 |
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178 This is desirable, since it is more likely newer packfiles have more |
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179 desirable data. |
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180 """ |
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181 files = [] |
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182 for path, mtime, size in self._getavailablepackfiles(): |
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183 files.append((mtime, size, path)) |
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184 files = sorted(files, reverse=True) |
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185 for mtime, size, path in files: |
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186 yield path, mtime, size |
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187 |
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188 def gettotalsizeandcount(self): |
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189 """Returns the total disk size (in bytes) of all the pack files in |
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190 this store, and the count of pack files. |
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191 |
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192 (This might be smaller than the total size of the ``self.path`` |
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193 directory, since this only considers fuly-writen pack files, and not |
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194 temporary files or other detritus on the directory.) |
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195 """ |
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196 totalsize = 0 |
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197 count = 0 |
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198 for __, __, size in self._getavailablepackfiles(): |
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199 totalsize += size |
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200 count += 1 |
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201 return totalsize, count |
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202 |
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203 def getmetrics(self): |
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204 """Returns metrics on the state of this store.""" |
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205 size, count = self.gettotalsizeandcount() |
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206 return { |
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207 'numpacks': count, |
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208 'totalpacksize': size, |
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209 } |
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210 |
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211 def getpack(self, path): |
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212 raise NotImplementedError() |
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213 |
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214 def getmissing(self, keys): |
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215 missing = keys |
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216 for pack in self.packs: |
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217 missing = pack.getmissing(missing) |
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218 |
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219 # Ensures better performance of the cache by keeping the most |
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220 # recently accessed pack at the beginning in subsequent iterations. |
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221 if not missing: |
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222 return missing |
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223 |
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224 if missing: |
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225 for pack in self.refresh(): |
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226 missing = pack.getmissing(missing) |
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227 |
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228 return missing |
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229 |
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230 def markledger(self, ledger, options=None): |
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231 for pack in self.packs: |
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232 pack.markledger(ledger) |
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233 |
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234 def markforrefresh(self): |
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235 """Tells the store that there may be new pack files, so the next time it |
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236 has a lookup miss it should check for new files.""" |
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237 self.lastrefresh = 0 |
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238 |
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239 def refresh(self): |
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240 """Checks for any new packs on disk, adds them to the main pack list, |
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241 and returns a list of just the new packs.""" |
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242 now = time.time() |
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243 |
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244 # If we experience a lot of misses (like in the case of getmissing() on |
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245 # new objects), let's only actually check disk for new stuff every once |
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246 # in a while. Generally this code path should only ever matter when a |
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247 # repack is going on in the background, and that should be pretty rare |
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248 # to have that happen twice in quick succession. |
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249 newpacks = [] |
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250 if now > self.lastrefresh + REFRESHRATE: |
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251 self.lastrefresh = now |
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252 previous = set(p.path for p in self.packs) |
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253 for filepath, __, __ in self._getavailablepackfilessorted(): |
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254 if filepath not in previous: |
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255 newpack = self.getpack(filepath) |
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256 newpacks.append(newpack) |
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257 self.packs.add(newpack) |
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258 |
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259 return newpacks |
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260 |
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261 class versionmixin(object): |
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262 # Mix-in for classes with multiple supported versions |
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263 VERSION = None |
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264 SUPPORTED_VERSIONS = [2] |
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265 |
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266 def _checkversion(self, version): |
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267 if version in self.SUPPORTED_VERSIONS: |
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268 if self.VERSION is None: |
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269 # only affect this instance |
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270 self.VERSION = version |
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271 elif self.VERSION != version: |
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272 raise RuntimeError('inconsistent version: %s' % version) |
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273 else: |
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274 raise RuntimeError('unsupported version: %s' % version) |
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275 |
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276 class basepack(versionmixin): |
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277 # The maximum amount we should read via mmap before remmaping so the old |
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278 # pages can be released (100MB) |
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279 MAXPAGEDIN = 100 * 1024**2 |
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280 |
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281 SUPPORTED_VERSIONS = [2] |
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282 |
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283 def __init__(self, path): |
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284 self.path = path |
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285 self.packpath = path + self.PACKSUFFIX |
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286 self.indexpath = path + self.INDEXSUFFIX |
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287 |
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288 self.indexsize = os.stat(self.indexpath).st_size |
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289 self.datasize = os.stat(self.packpath).st_size |
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290 |
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291 self._index = None |
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292 self._data = None |
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293 self.freememory() # initialize the mmap |
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294 |
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295 version = struct.unpack('!B', self._data[:PACKVERSIONSIZE])[0] |
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296 self._checkversion(version) |
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297 |
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298 version, config = struct.unpack('!BB', self._index[:INDEXVERSIONSIZE]) |
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299 self._checkversion(version) |
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300 |
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301 if 0b10000000 & config: |
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302 self.params = indexparams(LARGEFANOUTPREFIX, version) |
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303 else: |
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304 self.params = indexparams(SMALLFANOUTPREFIX, version) |
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305 |
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306 @util.propertycache |
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307 def _fanouttable(self): |
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308 params = self.params |
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309 rawfanout = self._index[FANOUTSTART:FANOUTSTART + params.fanoutsize] |
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310 fanouttable = [] |
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311 for i in pycompat.xrange(0, params.fanoutcount): |
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312 loc = i * 4 |
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313 fanoutentry = struct.unpack('!I', rawfanout[loc:loc + 4])[0] |
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314 fanouttable.append(fanoutentry) |
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315 return fanouttable |
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316 |
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317 @util.propertycache |
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318 def _indexend(self): |
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319 nodecount = struct.unpack_from('!Q', self._index, |
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320 self.params.indexstart - 8)[0] |
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321 return self.params.indexstart + nodecount * self.INDEXENTRYLENGTH |
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322 |
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323 def freememory(self): |
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324 """Unmap and remap the memory to free it up after known expensive |
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325 operations. Return True if self._data and self._index were reloaded. |
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326 """ |
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327 if self._index: |
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328 if self._pagedin < self.MAXPAGEDIN: |
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329 return False |
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330 |
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331 self._index.close() |
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332 self._data.close() |
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333 |
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334 # TODO: use an opener/vfs to access these paths |
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335 with open(self.indexpath, PACKOPENMODE) as indexfp: |
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336 # memory-map the file, size 0 means whole file |
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337 self._index = mmap.mmap(indexfp.fileno(), 0, |
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338 access=mmap.ACCESS_READ) |
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339 with open(self.packpath, PACKOPENMODE) as datafp: |
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340 self._data = mmap.mmap(datafp.fileno(), 0, access=mmap.ACCESS_READ) |
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341 |
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342 self._pagedin = 0 |
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343 return True |
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344 |
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345 def getmissing(self, keys): |
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346 raise NotImplementedError() |
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347 |
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348 def markledger(self, ledger, options=None): |
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349 raise NotImplementedError() |
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350 |
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351 def cleanup(self, ledger): |
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352 raise NotImplementedError() |
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353 |
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354 def __iter__(self): |
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355 raise NotImplementedError() |
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356 |
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357 def iterentries(self): |
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358 raise NotImplementedError() |
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359 |
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360 class mutablebasepack(versionmixin): |
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361 |
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362 def __init__(self, ui, packdir, version=2): |
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363 self._checkversion(version) |
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364 # TODO(augie): make this configurable |
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365 self._compressor = 'GZ' |
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366 opener = vfsmod.vfs(packdir) |
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367 opener.createmode = 0o444 |
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368 self.opener = opener |
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369 |
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370 self.entries = {} |
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371 |
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372 shallowutil.mkstickygroupdir(ui, packdir) |
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373 self.packfp, self.packpath = opener.mkstemp( |
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374 suffix=self.PACKSUFFIX + '-tmp') |
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375 self.idxfp, self.idxpath = opener.mkstemp( |
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376 suffix=self.INDEXSUFFIX + '-tmp') |
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377 self.packfp = os.fdopen(self.packfp, r'wb+') |
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378 self.idxfp = os.fdopen(self.idxfp, r'wb+') |
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379 self.sha = hashlib.sha1() |
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380 self._closed = False |
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381 |
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382 # The opener provides no way of doing permission fixup on files created |
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383 # via mkstemp, so we must fix it ourselves. We can probably fix this |
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384 # upstream in vfs.mkstemp so we don't need to use the private method. |
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385 opener._fixfilemode(opener.join(self.packpath)) |
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386 opener._fixfilemode(opener.join(self.idxpath)) |
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387 |
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388 # Write header |
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389 # TODO: make it extensible (ex: allow specifying compression algorithm, |
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390 # a flexible key/value header, delta algorithm, fanout size, etc) |
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391 versionbuf = struct.pack('!B', self.VERSION) # unsigned 1 byte int |
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392 self.writeraw(versionbuf) |
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393 |
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394 def __enter__(self): |
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395 return self |
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396 |
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397 def __exit__(self, exc_type, exc_value, traceback): |
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398 if exc_type is None: |
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399 self.close() |
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400 else: |
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401 self.abort() |
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402 |
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403 def abort(self): |
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404 # Unclean exit |
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405 self._cleantemppacks() |
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406 |
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407 def writeraw(self, data): |
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408 self.packfp.write(data) |
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409 self.sha.update(data) |
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410 |
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411 def close(self, ledger=None): |
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412 if self._closed: |
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413 return |
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414 |
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415 try: |
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416 sha = nodemod.hex(self.sha.digest()) |
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417 self.packfp.close() |
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418 self.writeindex() |
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419 |
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420 if len(self.entries) == 0: |
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421 # Empty pack |
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422 self._cleantemppacks() |
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423 self._closed = True |
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424 return None |
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425 |
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426 self.opener.rename(self.packpath, sha + self.PACKSUFFIX) |
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427 try: |
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428 self.opener.rename(self.idxpath, sha + self.INDEXSUFFIX) |
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429 except Exception as ex: |
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430 try: |
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431 self.opener.unlink(sha + self.PACKSUFFIX) |
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432 except Exception: |
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433 pass |
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434 # Throw exception 'ex' explicitly since a normal 'raise' would |
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435 # potentially throw an exception from the unlink cleanup. |
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436 raise ex |
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437 except Exception: |
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438 # Clean up temp packs in all exception cases |
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439 self._cleantemppacks() |
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440 raise |
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441 |
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442 self._closed = True |
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443 result = self.opener.join(sha) |
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444 if ledger: |
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445 ledger.addcreated(result) |
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446 return result |
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447 |
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448 def _cleantemppacks(self): |
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449 try: |
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450 self.opener.unlink(self.packpath) |
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451 except Exception: |
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452 pass |
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453 try: |
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454 self.opener.unlink(self.idxpath) |
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455 except Exception: |
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456 pass |
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457 |
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458 def writeindex(self): |
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459 rawindex = '' |
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460 |
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461 largefanout = len(self.entries) > SMALLFANOUTCUTOFF |
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462 if largefanout: |
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463 params = indexparams(LARGEFANOUTPREFIX, self.VERSION) |
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464 else: |
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465 params = indexparams(SMALLFANOUTPREFIX, self.VERSION) |
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466 |
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467 fanouttable = [EMPTYFANOUT] * params.fanoutcount |
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468 |
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469 # Precompute the location of each entry |
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470 locations = {} |
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471 count = 0 |
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472 for node in sorted(self.entries): |
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473 location = count * self.INDEXENTRYLENGTH |
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474 locations[node] = location |
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475 count += 1 |
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476 |
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477 # Must use [0] on the unpack result since it's always a tuple. |
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478 fanoutkey = struct.unpack(params.fanoutstruct, |
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479 node[:params.fanoutprefix])[0] |
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480 if fanouttable[fanoutkey] == EMPTYFANOUT: |
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481 fanouttable[fanoutkey] = location |
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|
482 |
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483 rawfanouttable = '' |
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484 last = 0 |
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485 for offset in fanouttable: |
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486 offset = offset if offset != EMPTYFANOUT else last |
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487 last = offset |
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488 rawfanouttable += struct.pack('!I', offset) |
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|
489 |
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490 rawentrieslength = struct.pack('!Q', len(self.entries)) |
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|
491 |
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492 # The index offset is the it's location in the file. So after the 2 byte |
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493 # header and the fanouttable. |
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494 rawindex = self.createindex(locations, 2 + len(rawfanouttable)) |
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|
495 |
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|
496 self._writeheader(params) |
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|
497 self.idxfp.write(rawfanouttable) |
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498 self.idxfp.write(rawentrieslength) |
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499 self.idxfp.write(rawindex) |
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500 self.idxfp.close() |
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501 |
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502 def createindex(self, nodelocations): |
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503 raise NotImplementedError() |
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|
504 |
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505 def _writeheader(self, indexparams): |
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506 # Index header |
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507 # <version: 1 byte> |
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508 # <large fanout: 1 bit> # 1 means 2^16, 0 means 2^8 |
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509 # <unused: 7 bit> # future use (compression, delta format, etc) |
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|
510 config = 0 |
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511 if indexparams.fanoutprefix == LARGEFANOUTPREFIX: |
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512 config = 0b10000000 |
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|
513 self.idxfp.write(struct.pack('!BB', self.VERSION, config)) |
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514 |
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|
515 class indexparams(object): |
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516 __slots__ = (r'fanoutprefix', r'fanoutstruct', r'fanoutcount', |
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517 r'fanoutsize', r'indexstart') |
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518 |
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519 def __init__(self, prefixsize, version): |
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520 self.fanoutprefix = prefixsize |
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521 |
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522 # The struct pack format for fanout table location (i.e. the format that |
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523 # converts the node prefix into an integer location in the fanout |
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|
524 # table). |
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525 if prefixsize == SMALLFANOUTPREFIX: |
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526 self.fanoutstruct = '!B' |
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527 elif prefixsize == LARGEFANOUTPREFIX: |
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528 self.fanoutstruct = '!H' |
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529 else: |
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530 raise ValueError("invalid fanout prefix size: %s" % prefixsize) |
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531 |
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532 # The number of fanout table entries |
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533 self.fanoutcount = 2**(prefixsize * 8) |
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|
534 |
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535 # The total bytes used by the fanout table |
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536 self.fanoutsize = self.fanoutcount * 4 |
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|
537 |
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|
538 self.indexstart = FANOUTSTART + self.fanoutsize |
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539 # Skip the index length |
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540 self.indexstart += 8 |