Mercurial > hg
annotate hgext/narrow/narrowchangegroup.py @ 36350:ff7a19ad7aa3
narrowchangegroup: remove backwards compatibility with old hg
This was missed in the initial import of narrowhg, but was detected by
the Python 3 porting effort once I got enough other things in narrow
fixed.
Differential Revision: https://phab.mercurial-scm.org/D2370
author | Augie Fackler <augie@google.com> |
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date | Wed, 21 Feb 2018 12:03:44 -0500 |
parents | f85e32a5e5c8 |
children | 3f0af89e008d |
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1 # narrowchangegroup.py - narrow clone changegroup creation and consumption |
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2 # |
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3 # Copyright 2017 Google, 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 |
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8 from __future__ import absolute_import |
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9 |
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10 from mercurial.i18n import _ |
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11 from mercurial import ( |
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12 changegroup, |
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13 error, |
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14 extensions, |
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15 manifest, |
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16 mdiff, |
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17 node, |
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18 revlog, |
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19 util, |
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20 ) |
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21 |
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22 from . import ( |
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23 narrowrepo, |
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24 ) |
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25 |
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26 def setup(): |
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27 |
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28 def supportedoutgoingversions(orig, repo): |
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29 versions = orig(repo) |
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30 if narrowrepo.REQUIREMENT in repo.requirements: |
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31 versions.discard('01') |
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32 versions.discard('02') |
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33 return versions |
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34 |
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35 extensions.wrapfunction(changegroup, 'supportedoutgoingversions', |
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36 supportedoutgoingversions) |
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37 |
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38 def prune(orig, self, revlog, missing, commonrevs): |
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39 if isinstance(revlog, manifest.manifestrevlog): |
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40 matcher = getattr(self._repo, 'narrowmatch', |
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41 getattr(self, '_narrow_matcher', None)) |
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42 if (matcher is not None and |
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43 not matcher().visitdir(revlog._dir[:-1] or '.')): |
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44 return [] |
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45 return orig(self, revlog, missing, commonrevs) |
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46 |
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47 extensions.wrapfunction(changegroup.cg1packer, 'prune', prune) |
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48 |
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49 def generatefiles(orig, self, changedfiles, linknodes, commonrevs, |
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50 source): |
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51 matcher = getattr(self._repo, 'narrowmatch', |
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52 getattr(self, '_narrow_matcher', None)) |
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53 if matcher is not None: |
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54 narrowmatch = matcher() |
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55 changedfiles = [f for f in changedfiles if narrowmatch(f)] |
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56 if getattr(self, 'is_shallow', False): |
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57 # See comment in generate() for why this sadness is a thing. |
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58 mfdicts = self._mfdicts |
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59 del self._mfdicts |
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60 # In a shallow clone, the linknodes callback needs to also include |
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61 # those file nodes that are in the manifests we sent but weren't |
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62 # introduced by those manifests. |
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63 commonctxs = [self._repo[c] for c in commonrevs] |
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64 oldlinknodes = linknodes |
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65 clrev = self._repo.changelog.rev |
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66 def linknodes(flog, fname): |
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67 for c in commonctxs: |
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68 try: |
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69 fnode = c.filenode(fname) |
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70 self.clrev_to_localrev[c.rev()] = flog.rev(fnode) |
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71 except error.ManifestLookupError: |
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72 pass |
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73 links = oldlinknodes(flog, fname) |
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74 if len(links) != len(mfdicts): |
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75 for mf, lr in mfdicts: |
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76 fnode = mf.get(fname, None) |
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77 if fnode in links: |
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78 links[fnode] = min(links[fnode], lr, key=clrev) |
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79 elif fnode: |
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80 links[fnode] = lr |
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81 return links |
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82 return orig(self, changedfiles, linknodes, commonrevs, source) |
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83 extensions.wrapfunction( |
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84 changegroup.cg1packer, 'generatefiles', generatefiles) |
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85 |
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86 def ellipsisdata(packer, rev, revlog_, p1, p2, data, linknode): |
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87 n = revlog_.node(rev) |
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88 p1n, p2n = revlog_.node(p1), revlog_.node(p2) |
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89 flags = revlog_.flags(rev) |
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90 flags |= revlog.REVIDX_ELLIPSIS |
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91 meta = packer.builddeltaheader( |
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92 n, p1n, p2n, node.nullid, linknode, flags) |
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93 # TODO: try and actually send deltas for ellipsis data blocks |
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94 diffheader = mdiff.trivialdiffheader(len(data)) |
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95 l = len(meta) + len(diffheader) + len(data) |
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96 return ''.join((changegroup.chunkheader(l), |
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97 meta, |
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98 diffheader, |
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99 data)) |
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100 |
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101 def close(orig, self): |
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102 getattr(self, 'clrev_to_localrev', {}).clear() |
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103 if getattr(self, 'next_clrev_to_localrev', {}): |
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104 self.clrev_to_localrev = self.next_clrev_to_localrev |
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105 del self.next_clrev_to_localrev |
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106 self.changelog_done = True |
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107 return orig(self) |
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108 extensions.wrapfunction(changegroup.cg1packer, 'close', close) |
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109 |
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110 # In a perfect world, we'd generate better ellipsis-ified graphs |
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111 # for non-changelog revlogs. In practice, we haven't started doing |
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112 # that yet, so the resulting DAGs for the manifestlog and filelogs |
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113 # are actually full of bogus parentage on all the ellipsis |
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114 # nodes. This has the side effect that, while the contents are |
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115 # correct, the individual DAGs might be completely out of whack in |
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116 # a case like 882681bc3166 and its ancestors (back about 10 |
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117 # revisions or so) in the main hg repo. |
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118 # |
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119 # The one invariant we *know* holds is that the new (potentially |
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120 # bogus) DAG shape will be valid if we order the nodes in the |
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121 # order that they're introduced in dramatis personae by the |
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122 # changelog, so what we do is we sort the non-changelog histories |
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123 # by the order in which they are used by the changelog. |
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124 def _sortgroup(orig, self, revlog, nodelist, lookup): |
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125 if not util.safehasattr(self, 'full_nodes') or not self.clnode_to_rev: |
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126 return orig(self, revlog, nodelist, lookup) |
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127 key = lambda n: self.clnode_to_rev[lookup(n)] |
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128 return [revlog.rev(n) for n in sorted(nodelist, key=key)] |
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129 |
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130 extensions.wrapfunction(changegroup.cg1packer, '_sortgroup', _sortgroup) |
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131 |
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132 def generate(orig, self, commonrevs, clnodes, fastpathlinkrev, source): |
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133 '''yield a sequence of changegroup chunks (strings)''' |
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134 # Note: other than delegating to orig, the only deviation in |
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135 # logic from normal hg's generate is marked with BEGIN/END |
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136 # NARROW HACK. |
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137 if not util.safehasattr(self, 'full_nodes'): |
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138 # not sending a narrow bundle |
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139 for x in orig(self, commonrevs, clnodes, fastpathlinkrev, source): |
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140 yield x |
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141 return |
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142 |
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143 repo = self._repo |
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144 cl = repo.changelog |
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145 mfl = repo.manifestlog |
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146 mfrevlog = mfl._revlog |
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147 |
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148 clrevorder = {} |
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149 mfs = {} # needed manifests |
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150 fnodes = {} # needed file nodes |
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151 changedfiles = set() |
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152 |
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153 # Callback for the changelog, used to collect changed files and manifest |
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154 # nodes. |
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155 # Returns the linkrev node (identity in the changelog case). |
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156 def lookupcl(x): |
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157 c = cl.read(x) |
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158 clrevorder[x] = len(clrevorder) |
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159 # BEGIN NARROW HACK |
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160 # |
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161 # Only update mfs if x is going to be sent. Otherwise we |
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162 # end up with bogus linkrevs specified for manifests and |
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163 # we skip some manifest nodes that we should otherwise |
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164 # have sent. |
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165 if x in self.full_nodes or cl.rev(x) in self.precomputed_ellipsis: |
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166 n = c[0] |
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167 # record the first changeset introducing this manifest version |
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168 mfs.setdefault(n, x) |
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169 # Set this narrow-specific dict so we have the lowest manifest |
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170 # revnum to look up for this cl revnum. (Part of mapping |
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171 # changelog ellipsis parents to manifest ellipsis parents) |
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172 self.next_clrev_to_localrev.setdefault(cl.rev(x), |
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173 mfrevlog.rev(n)) |
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174 # We can't trust the changed files list in the changeset if the |
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175 # client requested a shallow clone. |
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176 if self.is_shallow: |
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177 changedfiles.update(mfl[c[0]].read().keys()) |
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178 else: |
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179 changedfiles.update(c[3]) |
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180 # END NARROW HACK |
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181 # Record a complete list of potentially-changed files in |
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182 # this manifest. |
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183 return x |
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184 |
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185 self._verbosenote(_('uncompressed size of bundle content:\n')) |
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186 size = 0 |
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187 for chunk in self.group(clnodes, cl, lookupcl, units=_('changesets')): |
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188 size += len(chunk) |
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189 yield chunk |
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190 self._verbosenote(_('%8.i (changelog)\n') % size) |
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191 |
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192 # We need to make sure that the linkrev in the changegroup refers to |
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193 # the first changeset that introduced the manifest or file revision. |
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194 # The fastpath is usually safer than the slowpath, because the filelogs |
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195 # are walked in revlog order. |
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196 # |
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197 # When taking the slowpath with reorder=None and the manifest revlog |
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198 # uses generaldelta, the manifest may be walked in the "wrong" order. |
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199 # Without 'clrevorder', we would get an incorrect linkrev (see fix in |
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200 # cc0ff93d0c0c). |
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201 # |
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202 # When taking the fastpath, we are only vulnerable to reordering |
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203 # of the changelog itself. The changelog never uses generaldelta, so |
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204 # it is only reordered when reorder=True. To handle this case, we |
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205 # simply take the slowpath, which already has the 'clrevorder' logic. |
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206 # This was also fixed in cc0ff93d0c0c. |
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207 fastpathlinkrev = fastpathlinkrev and not self._reorder |
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208 # Treemanifests don't work correctly with fastpathlinkrev |
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209 # either, because we don't discover which directory nodes to |
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210 # send along with files. This could probably be fixed. |
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211 fastpathlinkrev = fastpathlinkrev and ( |
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212 'treemanifest' not in repo.requirements) |
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213 # Shallow clones also don't work correctly with fastpathlinkrev |
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214 # because file nodes may need to be sent for a manifest even if they |
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215 # weren't introduced by that manifest. |
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216 fastpathlinkrev = fastpathlinkrev and not self.is_shallow |
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217 |
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218 for chunk in self.generatemanifests(commonrevs, clrevorder, |
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219 fastpathlinkrev, mfs, fnodes, source): |
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220 yield chunk |
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221 # BEGIN NARROW HACK |
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222 mfdicts = None |
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223 if self.is_shallow: |
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224 mfdicts = [(self._repo.manifestlog[n].read(), lr) |
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225 for (n, lr) in mfs.iteritems()] |
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226 # END NARROW HACK |
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227 mfs.clear() |
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228 clrevs = set(cl.rev(x) for x in clnodes) |
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229 |
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230 if not fastpathlinkrev: |
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231 def linknodes(unused, fname): |
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232 return fnodes.get(fname, {}) |
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233 else: |
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234 cln = cl.node |
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235 def linknodes(filerevlog, fname): |
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236 llr = filerevlog.linkrev |
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237 fln = filerevlog.node |
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238 revs = ((r, llr(r)) for r in filerevlog) |
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239 return dict((fln(r), cln(lr)) for r, lr in revs if lr in clrevs) |
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240 |
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241 # BEGIN NARROW HACK |
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242 # |
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243 # We need to pass the mfdicts variable down into |
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244 # generatefiles(), but more than one command might have |
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245 # wrapped generatefiles so we can't modify the function |
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246 # signature. Instead, we pass the data to ourselves using an |
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247 # instance attribute. I'm sorry. |
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248 self._mfdicts = mfdicts |
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249 # END NARROW HACK |
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250 for chunk in self.generatefiles(changedfiles, linknodes, commonrevs, |
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251 source): |
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252 yield chunk |
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253 |
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254 yield self.close() |
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255 |
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256 if clnodes: |
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257 repo.hook('outgoing', node=node.hex(clnodes[0]), source=source) |
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258 extensions.wrapfunction(changegroup.cg1packer, 'generate', generate) |
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259 |
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260 def revchunk(orig, self, revlog, rev, prev, linknode): |
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261 if not util.safehasattr(self, 'full_nodes'): |
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262 # not sending a narrow changegroup |
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263 for x in orig(self, revlog, rev, prev, linknode): |
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264 yield x |
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265 return |
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266 # build up some mapping information that's useful later. See |
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267 # the local() nested function below. |
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268 if not self.changelog_done: |
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269 self.clnode_to_rev[linknode] = rev |
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270 linkrev = rev |
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271 self.clrev_to_localrev[linkrev] = rev |
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272 else: |
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273 linkrev = self.clnode_to_rev[linknode] |
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274 self.clrev_to_localrev[linkrev] = rev |
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275 # This is a node to send in full, because the changeset it |
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276 # corresponds to was a full changeset. |
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277 if linknode in self.full_nodes: |
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278 for x in orig(self, revlog, rev, prev, linknode): |
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279 yield x |
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280 return |
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281 # At this point, a node can either be one we should skip or an |
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282 # ellipsis. If it's not an ellipsis, bail immediately. |
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283 if linkrev not in self.precomputed_ellipsis: |
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284 return |
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285 linkparents = self.precomputed_ellipsis[linkrev] |
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286 def local(clrev): |
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287 """Turn a changelog revnum into a local revnum. |
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288 |
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289 The ellipsis dag is stored as revnums on the changelog, |
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290 but when we're producing ellipsis entries for |
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291 non-changelog revlogs, we need to turn those numbers into |
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292 something local. This does that for us, and during the |
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293 changelog sending phase will also expand the stored |
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294 mappings as needed. |
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295 """ |
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296 if clrev == node.nullrev: |
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297 return node.nullrev |
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298 if not self.changelog_done: |
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299 # If we're doing the changelog, it's possible that we |
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300 # have a parent that is already on the client, and we |
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301 # need to store some extra mapping information so that |
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302 # our contained ellipsis nodes will be able to resolve |
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303 # their parents. |
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304 if clrev not in self.clrev_to_localrev: |
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305 clnode = revlog.node(clrev) |
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306 self.clnode_to_rev[clnode] = clrev |
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307 return clrev |
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308 # Walk the ellipsis-ized changelog breadth-first looking for a |
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309 # change that has been linked from the current revlog. |
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310 # |
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311 # For a flat manifest revlog only a single step should be necessary |
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312 # as all relevant changelog entries are relevant to the flat |
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313 # manifest. |
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314 # |
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315 # For a filelog or tree manifest dirlog however not every changelog |
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316 # entry will have been relevant, so we need to skip some changelog |
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317 # nodes even after ellipsis-izing. |
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318 walk = [clrev] |
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319 while walk: |
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320 p = walk[0] |
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321 walk = walk[1:] |
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322 if p in self.clrev_to_localrev: |
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323 return self.clrev_to_localrev[p] |
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324 elif p in self.full_nodes: |
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325 walk.extend([pp for pp in self._repo.changelog.parentrevs(p) |
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326 if pp != node.nullrev]) |
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327 elif p in self.precomputed_ellipsis: |
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328 walk.extend([pp for pp in self.precomputed_ellipsis[p] |
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329 if pp != node.nullrev]) |
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330 else: |
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331 # In this case, we've got an ellipsis with parents |
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332 # outside the current bundle (likely an |
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333 # incremental pull). We "know" that we can use the |
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334 # value of this same revlog at whatever revision |
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335 # is pointed to by linknode. "Know" is in scare |
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336 # quotes because I haven't done enough examination |
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337 # of edge cases to convince myself this is really |
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338 # a fact - it works for all the (admittedly |
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339 # thorough) cases in our testsuite, but I would be |
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340 # somewhat unsurprised to find a case in the wild |
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341 # where this breaks down a bit. That said, I don't |
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342 # know if it would hurt anything. |
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343 for i in xrange(rev, 0, -1): |
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344 if revlog.linkrev(i) == clrev: |
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345 return i |
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346 # We failed to resolve a parent for this node, so |
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347 # we crash the changegroup construction. |
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348 raise error.Abort( |
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349 'unable to resolve parent while packing %r %r' |
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350 ' for changeset %r' % (revlog.indexfile, rev, clrev)) |
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351 return node.nullrev |
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352 |
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353 if not linkparents or ( |
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354 revlog.parentrevs(rev) == (node.nullrev, node.nullrev)): |
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355 p1, p2 = node.nullrev, node.nullrev |
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356 elif len(linkparents) == 1: |
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357 p1, = sorted(local(p) for p in linkparents) |
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358 p2 = node.nullrev |
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359 else: |
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360 p1, p2 = sorted(local(p) for p in linkparents) |
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361 yield ellipsisdata( |
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362 self, rev, revlog, p1, p2, revlog.revision(rev), linknode) |
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363 extensions.wrapfunction(changegroup.cg1packer, 'revchunk', revchunk) |
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364 |
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365 def deltaparent(orig, self, revlog, rev, p1, p2, prev): |
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366 if util.safehasattr(self, 'full_nodes'): |
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367 # TODO: send better deltas when in narrow mode. |
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368 # |
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369 # changegroup.group() loops over revisions to send, |
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370 # including revisions we'll skip. What this means is that |
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371 # `prev` will be a potentially useless delta base for all |
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372 # ellipsis nodes, as the client likely won't have it. In |
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373 # the future we should do bookkeeping about which nodes |
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374 # have been sent to the client, and try to be |
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375 # significantly smarter about delta bases. This is |
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376 # slightly tricky because this same code has to work for |
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377 # all revlogs, and we don't have the linkrev/linknode here. |
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378 return p1 |
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379 return orig(self, revlog, rev, p1, p2, prev) |
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380 extensions.wrapfunction(changegroup.cg2packer, 'deltaparent', deltaparent) |