Mercurial > hg
annotate hgext/remotefilelog/shallowbundle.py @ 40495:3a333a582d7b
remotefilelog: import pruned-down remotefilelog extension from hg-experimental
This is remotefilelog as of my recent patches for compatibility with
current tip of hg, minus support for old versions of Mercurial and
some FB-specific features like their treemanifest extension and
fetching linkrev data from a patched phabricator. The file extutil.py
moved from hgext3rd to remotefilelog.
This is not yet ready to be landed, consider it a preview for
now. Planned changes include:
* replace lz4 with zstd
* rename some capabilities, requirements and wireproto commands to mark
them as experimental
* consolidate bits of shallowutil with related functions (eg readfile)
I'm certainly open to other (small) changes, but my rough mission is
to land this largely as-is so we can use it as a model of the
functionality we need going forward for lazy-fetching of file contents
from a server.
# no-check-commit because of a few foo_bar functions
Differential Revision: https://phab.mercurial-scm.org/D4782
author | Augie Fackler <augie@google.com> |
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date | Thu, 27 Sep 2018 13:03:19 -0400 |
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children | ed19958dbf5d |
rev | line source |
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40495
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1 # shallowbundle.py - bundle10 implementation for use with shallow repositories |
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2 # |
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3 # Copyright 2013 Facebook, Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 from __future__ import absolute_import |
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8 |
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9 from mercurial.i18n import _ |
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10 from mercurial.node import bin, hex, nullid |
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11 from mercurial import ( |
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12 bundlerepo, |
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13 changegroup, |
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14 error, |
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15 match, |
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16 mdiff, |
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17 pycompat, |
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18 ) |
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19 from . import ( |
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20 remotefilelog, |
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21 shallowutil, |
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22 ) |
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23 |
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24 NoFiles = 0 |
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25 LocalFiles = 1 |
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26 AllFiles = 2 |
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27 |
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28 requirement = "remotefilelog" |
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29 |
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30 def shallowgroup(cls, self, nodelist, rlog, lookup, units=None, reorder=None): |
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31 if not isinstance(rlog, remotefilelog.remotefilelog): |
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32 for c in super(cls, self).group(nodelist, rlog, lookup, |
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33 units=units): |
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34 yield c |
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35 return |
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36 |
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37 if len(nodelist) == 0: |
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38 yield self.close() |
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39 return |
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40 |
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41 nodelist = shallowutil.sortnodes(nodelist, rlog.parents) |
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42 |
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43 # add the parent of the first rev |
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44 p = rlog.parents(nodelist[0])[0] |
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45 nodelist.insert(0, p) |
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46 |
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47 # build deltas |
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48 for i in pycompat.xrange(len(nodelist) - 1): |
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49 prev, curr = nodelist[i], nodelist[i + 1] |
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50 linknode = lookup(curr) |
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51 for c in self.nodechunk(rlog, curr, prev, linknode): |
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52 yield c |
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53 |
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54 yield self.close() |
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55 |
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56 class shallowcg1packer(changegroup.cgpacker): |
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57 def generate(self, commonrevs, clnodes, fastpathlinkrev, source): |
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58 if "remotefilelog" in self._repo.requirements: |
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59 fastpathlinkrev = False |
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60 |
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61 return super(shallowcg1packer, self).generate(commonrevs, clnodes, |
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62 fastpathlinkrev, source) |
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63 |
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64 def group(self, nodelist, rlog, lookup, units=None, reorder=None): |
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65 return shallowgroup(shallowcg1packer, self, nodelist, rlog, lookup, |
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66 units=units) |
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67 |
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68 def generatefiles(self, changedfiles, *args): |
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69 try: |
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70 linknodes, commonrevs, source = args |
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71 except ValueError: |
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72 commonrevs, source, mfdicts, fastpathlinkrev, fnodes, clrevs = args |
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73 if requirement in self._repo.requirements: |
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74 repo = self._repo |
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75 if isinstance(repo, bundlerepo.bundlerepository): |
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76 # If the bundle contains filelogs, we can't pull from it, since |
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77 # bundlerepo is heavily tied to revlogs. Instead require that |
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78 # the user use unbundle instead. |
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79 # Force load the filelog data. |
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80 bundlerepo.bundlerepository.file(repo, 'foo') |
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81 if repo._cgfilespos: |
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82 raise error.Abort("cannot pull from full bundles", |
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83 hint="use `hg unbundle` instead") |
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84 return [] |
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85 filestosend = self.shouldaddfilegroups(source) |
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86 if filestosend == NoFiles: |
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87 changedfiles = list([f for f in changedfiles |
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88 if not repo.shallowmatch(f)]) |
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89 |
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90 return super(shallowcg1packer, self).generatefiles( |
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91 changedfiles, *args) |
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92 |
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93 def shouldaddfilegroups(self, source): |
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94 repo = self._repo |
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95 if not requirement in repo.requirements: |
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96 return AllFiles |
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97 |
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98 if source == "push" or source == "bundle": |
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99 return AllFiles |
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100 |
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101 caps = self._bundlecaps or [] |
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102 if source == "serve" or source == "pull": |
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103 if 'remotefilelog' in caps: |
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104 return LocalFiles |
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105 else: |
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106 # Serving to a full repo requires us to serve everything |
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107 repo.ui.warn(_("pulling from a shallow repo\n")) |
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108 return AllFiles |
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109 |
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110 return NoFiles |
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111 |
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112 def prune(self, rlog, missing, commonrevs): |
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113 if not isinstance(rlog, remotefilelog.remotefilelog): |
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114 return super(shallowcg1packer, self).prune(rlog, missing, |
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115 commonrevs) |
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116 |
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117 repo = self._repo |
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118 results = [] |
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119 for fnode in missing: |
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120 fctx = repo.filectx(rlog.filename, fileid=fnode) |
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121 if fctx.linkrev() not in commonrevs: |
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122 results.append(fnode) |
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123 return results |
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124 |
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125 def nodechunk(self, revlog, node, prevnode, linknode): |
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126 prefix = '' |
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127 if prevnode == nullid: |
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128 delta = revlog.revision(node, raw=True) |
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129 prefix = mdiff.trivialdiffheader(len(delta)) |
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130 else: |
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131 # Actually uses remotefilelog.revdiff which works on nodes, not revs |
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132 delta = revlog.revdiff(prevnode, node) |
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133 p1, p2 = revlog.parents(node) |
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134 flags = revlog.flags(node) |
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135 meta = self.builddeltaheader(node, p1, p2, prevnode, linknode, flags) |
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136 meta += prefix |
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137 l = len(meta) + len(delta) |
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138 yield changegroup.chunkheader(l) |
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139 yield meta |
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140 yield delta |
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141 |
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142 def makechangegroup(orig, repo, outgoing, version, source, *args, **kwargs): |
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143 if not requirement in repo.requirements: |
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144 return orig(repo, outgoing, version, source, *args, **kwargs) |
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145 |
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146 original = repo.shallowmatch |
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147 try: |
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148 # if serving, only send files the clients has patterns for |
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149 if source == 'serve': |
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150 bundlecaps = kwargs.get('bundlecaps') |
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151 includepattern = None |
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152 excludepattern = None |
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153 for cap in (bundlecaps or []): |
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154 if cap.startswith("includepattern="): |
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155 raw = cap[len("includepattern="):] |
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156 if raw: |
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157 includepattern = raw.split('\0') |
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158 elif cap.startswith("excludepattern="): |
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159 raw = cap[len("excludepattern="):] |
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160 if raw: |
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161 excludepattern = raw.split('\0') |
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162 if includepattern or excludepattern: |
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163 repo.shallowmatch = match.match(repo.root, '', None, |
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164 includepattern, excludepattern) |
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165 else: |
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166 repo.shallowmatch = match.always(repo.root, '') |
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167 return orig(repo, outgoing, version, source, *args, **kwargs) |
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168 finally: |
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169 repo.shallowmatch = original |
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170 |
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171 def addchangegroupfiles(orig, repo, source, revmap, trp, expectedfiles, *args): |
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172 if not requirement in repo.requirements: |
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173 return orig(repo, source, revmap, trp, expectedfiles, *args) |
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174 |
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175 files = 0 |
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176 newfiles = 0 |
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177 visited = set() |
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178 revisiondatas = {} |
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179 queue = [] |
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180 |
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181 # Normal Mercurial processes each file one at a time, adding all |
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182 # the new revisions for that file at once. In remotefilelog a file |
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183 # revision may depend on a different file's revision (in the case |
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184 # of a rename/copy), so we must lay all revisions down across all |
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185 # files in topological order. |
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186 |
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187 # read all the file chunks but don't add them |
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188 while True: |
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189 chunkdata = source.filelogheader() |
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190 if not chunkdata: |
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191 break |
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192 files += 1 |
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193 f = chunkdata["filename"] |
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194 repo.ui.debug("adding %s revisions\n" % f) |
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195 repo.ui.progress(_('files'), files, total=expectedfiles) |
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196 |
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197 if not repo.shallowmatch(f): |
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198 fl = repo.file(f) |
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199 deltas = source.deltaiter() |
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200 fl.addgroup(deltas, revmap, trp) |
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201 continue |
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202 |
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203 chain = None |
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204 while True: |
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205 # returns: (node, p1, p2, cs, deltabase, delta, flags) or None |
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206 revisiondata = source.deltachunk(chain) |
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207 if not revisiondata: |
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208 break |
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209 |
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210 chain = revisiondata[0] |
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211 |
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212 revisiondatas[(f, chain)] = revisiondata |
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213 queue.append((f, chain)) |
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214 |
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215 if f not in visited: |
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216 newfiles += 1 |
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217 visited.add(f) |
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218 |
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219 if chain is None: |
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220 raise error.Abort(_("received file revlog group is empty")) |
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221 |
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222 processed = set() |
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223 def available(f, node, depf, depnode): |
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224 if depnode != nullid and (depf, depnode) not in processed: |
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225 if not (depf, depnode) in revisiondatas: |
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226 # It's not in the changegroup, assume it's already |
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227 # in the repo |
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228 return True |
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229 # re-add self to queue |
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230 queue.insert(0, (f, node)) |
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231 # add dependency in front |
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232 queue.insert(0, (depf, depnode)) |
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233 return False |
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234 return True |
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235 |
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236 skipcount = 0 |
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237 |
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238 # Prefetch the non-bundled revisions that we will need |
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239 prefetchfiles = [] |
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240 for f, node in queue: |
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241 revisiondata = revisiondatas[(f, node)] |
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242 # revisiondata: (node, p1, p2, cs, deltabase, delta, flags) |
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243 dependents = [revisiondata[1], revisiondata[2], revisiondata[4]] |
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244 |
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245 for dependent in dependents: |
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246 if dependent == nullid or (f, dependent) in revisiondatas: |
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247 continue |
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248 prefetchfiles.append((f, hex(dependent))) |
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249 |
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250 repo.fileservice.prefetch(prefetchfiles) |
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251 |
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252 # Apply the revisions in topological order such that a revision |
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253 # is only written once it's deltabase and parents have been written. |
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254 while queue: |
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255 f, node = queue.pop(0) |
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256 if (f, node) in processed: |
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257 continue |
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258 |
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259 skipcount += 1 |
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260 if skipcount > len(queue) + 1: |
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261 raise error.Abort(_("circular node dependency")) |
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262 |
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263 fl = repo.file(f) |
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264 |
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265 revisiondata = revisiondatas[(f, node)] |
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266 # revisiondata: (node, p1, p2, cs, deltabase, delta, flags) |
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267 node, p1, p2, linknode, deltabase, delta, flags = revisiondata |
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268 |
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269 if not available(f, node, f, deltabase): |
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270 continue |
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271 |
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272 base = fl.revision(deltabase, raw=True) |
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273 text = mdiff.patch(base, delta) |
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274 if isinstance(text, buffer): |
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275 text = str(text) |
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276 |
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277 meta, text = shallowutil.parsemeta(text) |
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278 if 'copy' in meta: |
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279 copyfrom = meta['copy'] |
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280 copynode = bin(meta['copyrev']) |
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281 if not available(f, node, copyfrom, copynode): |
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282 continue |
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283 |
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284 for p in [p1, p2]: |
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285 if p != nullid: |
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286 if not available(f, node, f, p): |
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287 continue |
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288 |
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289 fl.add(text, meta, trp, linknode, p1, p2) |
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290 processed.add((f, node)) |
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291 skipcount = 0 |
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292 |
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293 repo.ui.progress(_('files'), None) |
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294 |
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295 return len(revisiondatas), newfiles |