Mercurial > hg
annotate mercurial/logexchange.py @ 45637:ad6ebb6f0dfe
copies: make two version of the changeset centric algorithm
They are two main ways to run the changeset-centric copy-tracing algorithm. One
fed from data stored in side-data and still in development, and one based on
data stored in extra (with a "compatibility" mode).
The `extra` based is used in production at Google, but still experimental in
code. It is mostly unsuitable for other users because it affects the hash.
The side-data based storage and algorithm have been evolving to store more data, cover more cases
(mostly around merge, that Google do not really care about) and use lower level
storage for efficiency.
All this changes make is increasingly hard to maintain de common code base,
without impacting code complexity and performance. For example, the
compatibility mode requires to keep things at different level than what we
need for side-data.
So, I am duplicating the involved functions. The newly added `_extra` variants
will be kept as today, while I will do some deeper rework of the side data
versions.
Long terms, the side-data version should be more featureful and performant than
the extra based version, so I expect the duplicated `_extra` functions to
eventually get dropped.
Differential Revision: https://phab.mercurial-scm.org/D9114
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 25 Sep 2020 14:39:04 +0200 |
parents | d783f945a701 |
children | 89a2afe31e82 |
rev | line source |
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1 # logexchange.py |
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2 # |
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3 # Copyright 2017 Augie Fackler <raf@durin42.com> |
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4 # Copyright 2017 Sean Farley <sean@farley.io> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
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7 # GNU General Public License version 2 or any later version. |
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8 |
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9 from __future__ import absolute_import |
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10 |
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11 from .node import hex |
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12 |
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13 from . import ( |
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14 pycompat, |
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15 util, |
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16 vfs as vfsmod, |
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17 ) |
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18 |
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19 # directory name in .hg/ in which remotenames files will be present |
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20 remotenamedir = b'logexchange' |
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21 |
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22 |
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23 def readremotenamefile(repo, filename): |
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24 """ |
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25 reads a file from .hg/logexchange/ directory and yields it's content |
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26 filename: the file to be read |
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27 yield a tuple (node, remotepath, name) |
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28 """ |
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29 |
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30 vfs = vfsmod.vfs(repo.vfs.join(remotenamedir)) |
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31 if not vfs.exists(filename): |
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32 return |
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33 f = vfs(filename) |
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34 lineno = 0 |
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35 for line in f: |
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36 line = line.strip() |
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37 if not line: |
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38 continue |
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39 # contains the version number |
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40 if lineno == 0: |
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41 lineno += 1 |
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42 try: |
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43 node, remote, rname = line.split(b'\0') |
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44 yield node, remote, rname |
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45 except ValueError: |
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46 pass |
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47 |
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48 f.close() |
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49 |
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50 |
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51 def readremotenames(repo): |
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52 """ |
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53 read the details about the remotenames stored in .hg/logexchange/ and |
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54 yields a tuple (node, remotepath, name). It does not yields information |
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55 about whether an entry yielded is branch or bookmark. To get that |
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56 information, call the respective functions. |
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57 """ |
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58 |
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59 for bmentry in readremotenamefile(repo, b'bookmarks'): |
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60 yield bmentry |
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61 for branchentry in readremotenamefile(repo, b'branches'): |
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62 yield branchentry |
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63 |
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64 |
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65 def writeremotenamefile(repo, remotepath, names, nametype): |
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66 vfs = vfsmod.vfs(repo.vfs.join(remotenamedir)) |
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67 f = vfs(nametype, b'w', atomictemp=True) |
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68 # write the storage version info on top of file |
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69 # version '0' represents the very initial version of the storage format |
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70 f.write(b'0\n\n') |
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71 |
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72 olddata = set(readremotenamefile(repo, nametype)) |
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73 # re-save the data from a different remote than this one. |
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74 for node, oldpath, rname in sorted(olddata): |
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75 if oldpath != remotepath: |
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76 f.write(b'%s\0%s\0%s\n' % (node, oldpath, rname)) |
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77 |
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78 for name, node in sorted(pycompat.iteritems(names)): |
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79 if nametype == b"branches": |
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80 for n in node: |
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81 f.write(b'%s\0%s\0%s\n' % (n, remotepath, name)) |
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82 elif nametype == b"bookmarks": |
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83 if node: |
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84 f.write(b'%s\0%s\0%s\n' % (node, remotepath, name)) |
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85 |
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86 f.close() |
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87 |
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88 |
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89 def saveremotenames(repo, remotepath, branches=None, bookmarks=None): |
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90 """ |
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91 save remotenames i.e. remotebookmarks and remotebranches in their |
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92 respective files under ".hg/logexchange/" directory. |
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93 """ |
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94 wlock = repo.wlock() |
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95 try: |
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96 if bookmarks: |
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97 writeremotenamefile(repo, remotepath, bookmarks, b'bookmarks') |
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98 if branches: |
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99 writeremotenamefile(repo, remotepath, branches, b'branches') |
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100 finally: |
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101 wlock.release() |
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102 |
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103 |
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104 def activepath(repo, remote): |
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105 """returns remote path""" |
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106 # is the remote a local peer |
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107 local = remote.local() |
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108 |
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109 # determine the remote path from the repo, if possible; else just |
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110 # use the string given to us |
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111 rpath = remote |
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112 if local: |
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113 rpath = util.pconvert(remote._repo.root) |
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114 elif not isinstance(remote, bytes): |
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115 rpath = remote._url |
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116 |
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117 # represent the remotepath with user defined path name if exists |
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118 for path, url in repo.ui.configitems(b'paths'): |
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119 # remove auth info from user defined url |
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120 noauthurl = util.removeauth(url) |
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121 |
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122 # Standardize on unix style paths, otherwise some {remotenames} end up |
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123 # being an absolute path on Windows. |
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124 url = util.pconvert(bytes(url)) |
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125 noauthurl = util.pconvert(noauthurl) |
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126 if url == rpath or noauthurl == rpath: |
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127 rpath = path |
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128 break |
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129 |
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130 return rpath |
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131 |
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132 |
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133 def pullremotenames(localrepo, remoterepo): |
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134 """ |
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135 pulls bookmarks and branches information of the remote repo during a |
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136 pull or clone operation. |
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137 localrepo is our local repository |
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138 remoterepo is the peer instance |
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139 """ |
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140 remotepath = activepath(localrepo, remoterepo) |
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141 |
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142 with remoterepo.commandexecutor() as e: |
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143 bookmarks = e.callcommand( |
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144 b'listkeys', {b'namespace': b'bookmarks',} |
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145 ).result() |
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146 |
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147 # on a push, we don't want to keep obsolete heads since |
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148 # they won't show up as heads on the next pull, so we |
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149 # remove them here otherwise we would require the user |
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150 # to issue a pull to refresh the storage |
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151 bmap = {} |
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152 repo = localrepo.unfiltered() |
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153 |
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154 with remoterepo.commandexecutor() as e: |
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155 branchmap = e.callcommand(b'branchmap', {}).result() |
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156 |
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157 for branch, nodes in pycompat.iteritems(branchmap): |
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158 bmap[branch] = [] |
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159 for node in nodes: |
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160 if node in repo and not repo[node].obsolete(): |
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161 bmap[branch].append(hex(node)) |
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162 |
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163 saveremotenames(localrepo, remotepath, bmap, bookmarks) |