Mercurial > hg
annotate hgext/narrow/narrowchangegroup.py @ 38885:5839a170357d
changegroup: move deltaparent() from narrow
I'm not keen on performing the attribute sniff to test for
presence of ellipses mode: I'd rather we use a separate packer
instance that was ellipses mode specific. But I've tried to
formalize a better API without narrow in core and I can't
make sense of all the monkeypatching. My goal is to inline
as much of the monkeypatching as possible then refactor the
changegroup generation API.
We add this code to the cg2packer because narrow doesn't work
with cg1.
Differential Revision: https://phab.mercurial-scm.org/D4062
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 02 Aug 2018 09:40:18 -0700 |
parents | ee1ea96cf9c9 |
children | 66cf046ef60f |
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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 node, |
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16 pycompat, |
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17 util, |
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18 ) |
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19 |
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20 def setup(): |
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21 def generatefiles(orig, self, changedfiles, linknodes, commonrevs, |
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22 source): |
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23 changedfiles = list(filter(self._filematcher, changedfiles)) |
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24 |
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25 if getattr(self, 'is_shallow', False): |
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26 # See comment in generate() for why this sadness is a thing. |
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27 mfdicts = self._mfdicts |
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28 del self._mfdicts |
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29 # In a shallow clone, the linknodes callback needs to also include |
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30 # those file nodes that are in the manifests we sent but weren't |
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31 # introduced by those manifests. |
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32 commonctxs = [self._repo[c] for c in commonrevs] |
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33 oldlinknodes = linknodes |
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34 clrev = self._repo.changelog.rev |
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35 def linknodes(flog, fname): |
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36 for c in commonctxs: |
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37 try: |
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38 fnode = c.filenode(fname) |
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39 self.clrev_to_localrev[c.rev()] = flog.rev(fnode) |
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40 except error.ManifestLookupError: |
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41 pass |
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42 links = oldlinknodes(flog, fname) |
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43 if len(links) != len(mfdicts): |
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44 for mf, lr in mfdicts: |
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45 fnode = mf.get(fname, None) |
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46 if fnode in links: |
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47 links[fnode] = min(links[fnode], lr, key=clrev) |
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48 elif fnode: |
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49 links[fnode] = lr |
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50 return links |
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51 return orig(self, changedfiles, linknodes, commonrevs, source) |
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52 extensions.wrapfunction( |
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53 changegroup.cg1packer, 'generatefiles', generatefiles) |
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54 |
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55 def close(orig, self): |
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56 getattr(self, 'clrev_to_localrev', {}).clear() |
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57 if getattr(self, 'next_clrev_to_localrev', {}): |
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58 self.clrev_to_localrev = self.next_clrev_to_localrev |
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59 del self.next_clrev_to_localrev |
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60 self.changelog_done = True |
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61 return orig(self) |
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62 extensions.wrapfunction(changegroup.cg1packer, 'close', close) |
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63 |
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64 # In a perfect world, we'd generate better ellipsis-ified graphs |
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65 # for non-changelog revlogs. In practice, we haven't started doing |
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66 # that yet, so the resulting DAGs for the manifestlog and filelogs |
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67 # are actually full of bogus parentage on all the ellipsis |
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68 # nodes. This has the side effect that, while the contents are |
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69 # correct, the individual DAGs might be completely out of whack in |
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70 # a case like 882681bc3166 and its ancestors (back about 10 |
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71 # revisions or so) in the main hg repo. |
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72 # |
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73 # The one invariant we *know* holds is that the new (potentially |
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74 # bogus) DAG shape will be valid if we order the nodes in the |
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75 # order that they're introduced in dramatis personae by the |
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76 # changelog, so what we do is we sort the non-changelog histories |
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77 # by the order in which they are used by the changelog. |
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78 def _sortgroup(orig, self, revlog, nodelist, lookup): |
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79 if not util.safehasattr(self, 'full_nodes') or not self.clnode_to_rev: |
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80 return orig(self, revlog, nodelist, lookup) |
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81 key = lambda n: self.clnode_to_rev[lookup(n)] |
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82 return [revlog.rev(n) for n in sorted(nodelist, key=key)] |
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83 |
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84 extensions.wrapfunction(changegroup.cg1packer, '_sortgroup', _sortgroup) |
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85 |
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86 def generate(orig, self, commonrevs, clnodes, fastpathlinkrev, source): |
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87 '''yield a sequence of changegroup chunks (strings)''' |
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88 # Note: other than delegating to orig, the only deviation in |
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89 # logic from normal hg's generate is marked with BEGIN/END |
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90 # NARROW HACK. |
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91 if not util.safehasattr(self, 'full_nodes'): |
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92 # not sending a narrow bundle |
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93 for x in orig(self, commonrevs, clnodes, fastpathlinkrev, source): |
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94 yield x |
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95 return |
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96 |
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97 repo = self._repo |
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98 cl = repo.changelog |
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99 mfl = repo.manifestlog |
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100 mfrevlog = mfl._revlog |
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101 |
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102 clrevorder = {} |
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103 mfs = {} # needed manifests |
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104 fnodes = {} # needed file nodes |
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105 changedfiles = set() |
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106 |
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107 # Callback for the changelog, used to collect changed files and manifest |
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108 # nodes. |
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109 # Returns the linkrev node (identity in the changelog case). |
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110 def lookupcl(x): |
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111 c = cl.read(x) |
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112 clrevorder[x] = len(clrevorder) |
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113 # BEGIN NARROW HACK |
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114 # |
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115 # Only update mfs if x is going to be sent. Otherwise we |
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116 # end up with bogus linkrevs specified for manifests and |
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117 # we skip some manifest nodes that we should otherwise |
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118 # have sent. |
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119 if x in self.full_nodes or cl.rev(x) in self.precomputed_ellipsis: |
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120 n = c[0] |
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121 # record the first changeset introducing this manifest version |
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122 mfs.setdefault(n, x) |
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123 # Set this narrow-specific dict so we have the lowest manifest |
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124 # revnum to look up for this cl revnum. (Part of mapping |
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125 # changelog ellipsis parents to manifest ellipsis parents) |
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126 self.next_clrev_to_localrev.setdefault(cl.rev(x), |
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127 mfrevlog.rev(n)) |
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128 # We can't trust the changed files list in the changeset if the |
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129 # client requested a shallow clone. |
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130 if self.is_shallow: |
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131 changedfiles.update(mfl[c[0]].read().keys()) |
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132 else: |
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133 changedfiles.update(c[3]) |
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134 # END NARROW HACK |
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135 # Record a complete list of potentially-changed files in |
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136 # this manifest. |
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137 return x |
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138 |
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139 self._verbosenote(_('uncompressed size of bundle content:\n')) |
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140 size = 0 |
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141 for chunk in self.group(clnodes, cl, lookupcl, units=_('changesets')): |
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142 size += len(chunk) |
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143 yield chunk |
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144 self._verbosenote(_('%8.i (changelog)\n') % size) |
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145 |
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146 # We need to make sure that the linkrev in the changegroup refers to |
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147 # the first changeset that introduced the manifest or file revision. |
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148 # The fastpath is usually safer than the slowpath, because the filelogs |
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149 # are walked in revlog order. |
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150 # |
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151 # When taking the slowpath with reorder=None and the manifest revlog |
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152 # uses generaldelta, the manifest may be walked in the "wrong" order. |
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153 # Without 'clrevorder', we would get an incorrect linkrev (see fix in |
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154 # cc0ff93d0c0c). |
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155 # |
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156 # When taking the fastpath, we are only vulnerable to reordering |
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157 # of the changelog itself. The changelog never uses generaldelta, so |
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158 # it is only reordered when reorder=True. To handle this case, we |
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159 # simply take the slowpath, which already has the 'clrevorder' logic. |
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160 # This was also fixed in cc0ff93d0c0c. |
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161 fastpathlinkrev = fastpathlinkrev and not self._reorder |
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162 # Treemanifests don't work correctly with fastpathlinkrev |
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163 # either, because we don't discover which directory nodes to |
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164 # send along with files. This could probably be fixed. |
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165 fastpathlinkrev = fastpathlinkrev and ( |
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166 'treemanifest' not in repo.requirements) |
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167 # Shallow clones also don't work correctly with fastpathlinkrev |
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168 # because file nodes may need to be sent for a manifest even if they |
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169 # weren't introduced by that manifest. |
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170 fastpathlinkrev = fastpathlinkrev and not self.is_shallow |
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171 |
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172 for chunk in self.generatemanifests(commonrevs, clrevorder, |
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173 fastpathlinkrev, mfs, fnodes, source): |
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174 yield chunk |
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175 # BEGIN NARROW HACK |
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176 mfdicts = None |
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177 if self.is_shallow: |
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178 mfdicts = [(self._repo.manifestlog[n].read(), lr) |
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179 for (n, lr) in mfs.iteritems()] |
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180 # END NARROW HACK |
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181 mfs.clear() |
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182 clrevs = set(cl.rev(x) for x in clnodes) |
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183 |
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184 if not fastpathlinkrev: |
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185 def linknodes(unused, fname): |
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186 return fnodes.get(fname, {}) |
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187 else: |
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188 cln = cl.node |
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189 def linknodes(filerevlog, fname): |
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190 llr = filerevlog.linkrev |
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191 fln = filerevlog.node |
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192 revs = ((r, llr(r)) for r in filerevlog) |
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193 return dict((fln(r), cln(lr)) for r, lr in revs if lr in clrevs) |
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194 |
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195 # BEGIN NARROW HACK |
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196 # |
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197 # We need to pass the mfdicts variable down into |
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198 # generatefiles(), but more than one command might have |
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199 # wrapped generatefiles so we can't modify the function |
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200 # signature. Instead, we pass the data to ourselves using an |
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201 # instance attribute. I'm sorry. |
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202 self._mfdicts = mfdicts |
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203 # END NARROW HACK |
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204 for chunk in self.generatefiles(changedfiles, linknodes, commonrevs, |
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205 source): |
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206 yield chunk |
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207 |
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208 yield self.close() |
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209 |
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210 if clnodes: |
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211 repo.hook('outgoing', node=node.hex(clnodes[0]), source=source) |
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212 extensions.wrapfunction(changegroup.cg1packer, 'generate', generate) |
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213 |
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214 def revchunk(orig, self, revlog, rev, prev, linknode): |
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215 if not util.safehasattr(self, 'full_nodes'): |
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216 # not sending a narrow changegroup |
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217 for x in orig(self, revlog, rev, prev, linknode): |
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218 yield x |
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219 return |
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220 # build up some mapping information that's useful later. See |
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221 # the local() nested function below. |
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222 if not self.changelog_done: |
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223 self.clnode_to_rev[linknode] = rev |
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224 linkrev = rev |
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225 self.clrev_to_localrev[linkrev] = rev |
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226 else: |
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227 linkrev = self.clnode_to_rev[linknode] |
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228 self.clrev_to_localrev[linkrev] = rev |
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229 # This is a node to send in full, because the changeset it |
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230 # corresponds to was a full changeset. |
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231 if linknode in self.full_nodes: |
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232 for x in orig(self, revlog, rev, prev, linknode): |
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233 yield x |
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234 return |
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235 # At this point, a node can either be one we should skip or an |
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236 # ellipsis. If it's not an ellipsis, bail immediately. |
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237 if linkrev not in self.precomputed_ellipsis: |
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238 return |
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239 linkparents = self.precomputed_ellipsis[linkrev] |
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240 def local(clrev): |
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241 """Turn a changelog revnum into a local revnum. |
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242 |
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243 The ellipsis dag is stored as revnums on the changelog, |
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244 but when we're producing ellipsis entries for |
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245 non-changelog revlogs, we need to turn those numbers into |
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246 something local. This does that for us, and during the |
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247 changelog sending phase will also expand the stored |
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248 mappings as needed. |
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249 """ |
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250 if clrev == node.nullrev: |
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251 return node.nullrev |
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252 if not self.changelog_done: |
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253 # If we're doing the changelog, it's possible that we |
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254 # have a parent that is already on the client, and we |
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255 # need to store some extra mapping information so that |
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256 # our contained ellipsis nodes will be able to resolve |
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257 # their parents. |
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258 if clrev not in self.clrev_to_localrev: |
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259 clnode = revlog.node(clrev) |
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260 self.clnode_to_rev[clnode] = clrev |
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261 return clrev |
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262 # Walk the ellipsis-ized changelog breadth-first looking for a |
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263 # change that has been linked from the current revlog. |
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264 # |
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265 # For a flat manifest revlog only a single step should be necessary |
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266 # as all relevant changelog entries are relevant to the flat |
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267 # manifest. |
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268 # |
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269 # For a filelog or tree manifest dirlog however not every changelog |
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270 # entry will have been relevant, so we need to skip some changelog |
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271 # nodes even after ellipsis-izing. |
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272 walk = [clrev] |
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273 while walk: |
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274 p = walk[0] |
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275 walk = walk[1:] |
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276 if p in self.clrev_to_localrev: |
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277 return self.clrev_to_localrev[p] |
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278 elif p in self.full_nodes: |
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279 walk.extend([pp for pp in self._repo.changelog.parentrevs(p) |
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280 if pp != node.nullrev]) |
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281 elif p in self.precomputed_ellipsis: |
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282 walk.extend([pp for pp in self.precomputed_ellipsis[p] |
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283 if pp != node.nullrev]) |
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284 else: |
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285 # In this case, we've got an ellipsis with parents |
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286 # outside the current bundle (likely an |
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287 # incremental pull). We "know" that we can use the |
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288 # value of this same revlog at whatever revision |
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289 # is pointed to by linknode. "Know" is in scare |
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290 # quotes because I haven't done enough examination |
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291 # of edge cases to convince myself this is really |
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292 # a fact - it works for all the (admittedly |
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293 # thorough) cases in our testsuite, but I would be |
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294 # somewhat unsurprised to find a case in the wild |
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295 # where this breaks down a bit. That said, I don't |
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296 # know if it would hurt anything. |
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297 for i in pycompat.xrange(rev, 0, -1): |
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298 if revlog.linkrev(i) == clrev: |
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299 return i |
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300 # We failed to resolve a parent for this node, so |
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301 # we crash the changegroup construction. |
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302 raise error.Abort( |
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303 'unable to resolve parent while packing %r %r' |
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304 ' for changeset %r' % (revlog.indexfile, rev, clrev)) |
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305 return node.nullrev |
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306 |
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307 if not linkparents or ( |
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308 revlog.parentrevs(rev) == (node.nullrev, node.nullrev)): |
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309 p1, p2 = node.nullrev, node.nullrev |
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310 elif len(linkparents) == 1: |
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311 p1, = sorted(local(p) for p in linkparents) |
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312 p2 = node.nullrev |
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313 else: |
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314 p1, p2 = sorted(local(p) for p in linkparents) |
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315 n = revlog.node(rev) |
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316 yield changegroup.ellipsisdata( |
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317 self, rev, revlog, p1, p2, revlog.revision(n), linknode) |
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318 extensions.wrapfunction(changegroup.cg1packer, 'revchunk', revchunk) |