Mercurial > hg
annotate hgext/narrow/narrowbundle2.py @ 36160:9fd8c2a3db5a
narrowspec: move module into core
Having support for parsing the narrow specification in core is
necessary for moving many other parts of narrow to core.
We do still want to harmonize the narrow spec with the sparse
spec. And the format needs to be documented. But this shouldn't
hold up the code moving to core.
Differential Revision: https://phab.mercurial-scm.org/D2201
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 12 Feb 2018 16:21:34 -0800 |
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children | 4224f26c0d35 |
rev | line source |
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1 # narrowbundle2.py - bundle2 extensions for narrow repository support |
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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 import collections |
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11 import errno |
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12 import struct |
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13 |
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14 from mercurial.i18n import _ |
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15 from mercurial.node import ( |
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16 bin, |
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17 nullid, |
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18 nullrev, |
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19 ) |
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20 from mercurial import ( |
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21 bundle2, |
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22 changegroup, |
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23 dagutil, |
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24 error, |
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25 exchange, |
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26 extensions, |
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27 narrowspec, |
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28 repair, |
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29 util, |
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30 wireproto, |
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31 ) |
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32 |
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33 from . import ( |
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34 narrowrepo, |
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35 ) |
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36 |
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37 NARROWCAP = 'narrow' |
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38 _NARROWACL_SECTION = 'narrowhgacl' |
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39 _CHANGESPECPART = NARROWCAP + ':changespec' |
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40 _SPECPART = NARROWCAP + ':spec' |
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41 _SPECPART_INCLUDE = 'include' |
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42 _SPECPART_EXCLUDE = 'exclude' |
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43 _KILLNODESIGNAL = 'KILL' |
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44 _DONESIGNAL = 'DONE' |
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45 _ELIDEDCSHEADER = '>20s20s20sl' # cset id, p1, p2, len(text) |
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46 _ELIDEDMFHEADER = '>20s20s20s20sl' # manifest id, p1, p2, link id, len(text) |
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47 _CSHEADERSIZE = struct.calcsize(_ELIDEDCSHEADER) |
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48 _MFHEADERSIZE = struct.calcsize(_ELIDEDMFHEADER) |
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49 |
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50 # When advertising capabilities, always include narrow clone support. |
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51 def getrepocaps_narrow(orig, repo, **kwargs): |
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52 caps = orig(repo, **kwargs) |
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53 caps[NARROWCAP] = ['v0'] |
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54 return caps |
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55 |
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56 def _computeellipsis(repo, common, heads, known, match, depth=None): |
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57 """Compute the shape of a narrowed DAG. |
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58 |
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59 Args: |
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60 repo: The repository we're transferring. |
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61 common: The roots of the DAG range we're transferring. |
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62 May be just [nullid], which means all ancestors of heads. |
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63 heads: The heads of the DAG range we're transferring. |
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64 match: The narrowmatcher that allows us to identify relevant changes. |
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65 depth: If not None, only consider nodes to be full nodes if they are at |
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66 most depth changesets away from one of heads. |
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67 |
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68 Returns: |
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69 A tuple of (visitnodes, relevant_nodes, ellipsisroots) where: |
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70 |
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71 visitnodes: The list of nodes (either full or ellipsis) which |
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72 need to be sent to the client. |
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73 relevant_nodes: The set of changelog nodes which change a file inside |
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74 the narrowspec. The client needs these as non-ellipsis nodes. |
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75 ellipsisroots: A dict of {rev: parents} that is used in |
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76 narrowchangegroup to produce ellipsis nodes with the |
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77 correct parents. |
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78 """ |
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79 cl = repo.changelog |
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80 mfl = repo.manifestlog |
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81 |
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82 cldag = dagutil.revlogdag(cl) |
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83 # dagutil does not like nullid/nullrev |
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84 commonrevs = cldag.internalizeall(common - set([nullid])) | set([nullrev]) |
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85 headsrevs = cldag.internalizeall(heads) |
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86 if depth: |
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87 revdepth = {h: 0 for h in headsrevs} |
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88 |
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89 ellipsisheads = collections.defaultdict(set) |
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90 ellipsisroots = collections.defaultdict(set) |
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91 |
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92 def addroot(head, curchange): |
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93 """Add a root to an ellipsis head, splitting heads with 3 roots.""" |
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94 ellipsisroots[head].add(curchange) |
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95 # Recursively split ellipsis heads with 3 roots by finding the |
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96 # roots' youngest common descendant which is an elided merge commit. |
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97 # That descendant takes 2 of the 3 roots as its own, and becomes a |
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98 # root of the head. |
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99 while len(ellipsisroots[head]) > 2: |
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100 child, roots = splithead(head) |
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101 splitroots(head, child, roots) |
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102 head = child # Recurse in case we just added a 3rd root |
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103 |
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104 def splitroots(head, child, roots): |
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105 ellipsisroots[head].difference_update(roots) |
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106 ellipsisroots[head].add(child) |
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107 ellipsisroots[child].update(roots) |
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108 ellipsisroots[child].discard(child) |
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109 |
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110 def splithead(head): |
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111 r1, r2, r3 = sorted(ellipsisroots[head]) |
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112 for nr1, nr2 in ((r2, r3), (r1, r3), (r1, r2)): |
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113 mid = repo.revs('sort(merge() & %d::%d & %d::%d, -rev)', |
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114 nr1, head, nr2, head) |
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115 for j in mid: |
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116 if j == nr2: |
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117 return nr2, (nr1, nr2) |
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118 if j not in ellipsisroots or len(ellipsisroots[j]) < 2: |
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119 return j, (nr1, nr2) |
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120 raise error.Abort('Failed to split up ellipsis node! head: %d, ' |
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121 'roots: %d %d %d' % (head, r1, r2, r3)) |
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122 |
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123 missing = list(cl.findmissingrevs(common=commonrevs, heads=headsrevs)) |
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124 visit = reversed(missing) |
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125 relevant_nodes = set() |
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126 visitnodes = map(cl.node, missing) |
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127 required = set(headsrevs) | known |
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128 for rev in visit: |
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129 clrev = cl.changelogrevision(rev) |
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130 ps = cldag.parents(rev) |
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131 if depth is not None: |
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132 curdepth = revdepth[rev] |
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133 for p in ps: |
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134 revdepth[p] = min(curdepth + 1, revdepth.get(p, depth + 1)) |
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135 needed = False |
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136 shallow_enough = depth is None or revdepth[rev] <= depth |
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137 if shallow_enough: |
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138 curmf = mfl[clrev.manifest].read() |
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139 if ps: |
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140 # We choose to not trust the changed files list in |
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141 # changesets because it's not always correct. TODO: could |
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142 # we trust it for the non-merge case? |
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143 p1mf = mfl[cl.changelogrevision(ps[0]).manifest].read() |
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144 needed = any(match(f) for f in curmf.diff(p1mf).iterkeys()) |
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145 if not needed and len(ps) > 1: |
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146 # For merge changes, the list of changed files is not |
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147 # helpful, since we need to emit the merge if a file |
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148 # in the narrow spec has changed on either side of the |
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149 # merge. As a result, we do a manifest diff to check. |
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150 p2mf = mfl[cl.changelogrevision(ps[1]).manifest].read() |
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151 needed = any(match(f) for f in curmf.diff(p2mf).iterkeys()) |
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152 else: |
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153 # For a root node, we need to include the node if any |
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154 # files in the node match the narrowspec. |
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155 needed = any(match(f) for f in curmf) |
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156 |
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157 if needed: |
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158 for head in ellipsisheads[rev]: |
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159 addroot(head, rev) |
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160 for p in ps: |
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161 required.add(p) |
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162 relevant_nodes.add(cl.node(rev)) |
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163 else: |
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164 if not ps: |
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165 ps = [nullrev] |
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166 if rev in required: |
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167 for head in ellipsisheads[rev]: |
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168 addroot(head, rev) |
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169 for p in ps: |
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170 ellipsisheads[p].add(rev) |
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171 else: |
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172 for p in ps: |
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173 ellipsisheads[p] |= ellipsisheads[rev] |
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174 |
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175 # add common changesets as roots of their reachable ellipsis heads |
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176 for c in commonrevs: |
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177 for head in ellipsisheads[c]: |
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178 addroot(head, c) |
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179 return visitnodes, relevant_nodes, ellipsisroots |
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180 |
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181 def _packellipsischangegroup(repo, common, match, relevant_nodes, |
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182 ellipsisroots, visitnodes, depth, source, version): |
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183 if version in ('01', '02'): |
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184 raise error.Abort( |
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185 'ellipsis nodes require at least cg3 on client and server, ' |
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186 'but negotiated version %s' % version) |
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187 # We wrap cg1packer.revchunk, using a side channel to pass |
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188 # relevant_nodes into that area. Then if linknode isn't in the |
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189 # set, we know we have an ellipsis node and we should defer |
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190 # sending that node's data. We override close() to detect |
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191 # pending ellipsis nodes and flush them. |
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192 packer = changegroup.getbundler(version, repo) |
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193 # Let the packer have access to the narrow matcher so it can |
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194 # omit filelogs and dirlogs as needed |
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195 packer._narrow_matcher = lambda : match |
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196 # Give the packer the list of nodes which should not be |
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197 # ellipsis nodes. We store this rather than the set of nodes |
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198 # that should be an ellipsis because for very large histories |
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199 # we expect this to be significantly smaller. |
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200 packer.full_nodes = relevant_nodes |
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201 # Maps ellipsis revs to their roots at the changelog level. |
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202 packer.precomputed_ellipsis = ellipsisroots |
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203 # Maps CL revs to per-revlog revisions. Cleared in close() at |
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204 # the end of each group. |
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205 packer.clrev_to_localrev = {} |
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206 packer.next_clrev_to_localrev = {} |
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207 # Maps changelog nodes to changelog revs. Filled in once |
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208 # during changelog stage and then left unmodified. |
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209 packer.clnode_to_rev = {} |
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210 packer.changelog_done = False |
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211 # If true, informs the packer that it is serving shallow content and might |
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212 # need to pack file contents not introduced by the changes being packed. |
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213 packer.is_shallow = depth is not None |
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214 |
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215 return packer.generate(common, visitnodes, False, source) |
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216 |
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217 # Serve a changegroup for a client with a narrow clone. |
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218 def getbundlechangegrouppart_narrow(bundler, repo, source, |
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219 bundlecaps=None, b2caps=None, heads=None, |
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220 common=None, **kwargs): |
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221 cgversions = b2caps.get('changegroup') |
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222 getcgkwargs = {} |
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223 if cgversions: # 3.1 and 3.2 ship with an empty value |
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224 cgversions = [v for v in cgversions |
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225 if v in changegroup.supportedoutgoingversions(repo)] |
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226 if not cgversions: |
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227 raise ValueError(_('no common changegroup version')) |
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228 version = getcgkwargs['version'] = max(cgversions) |
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229 else: |
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230 raise ValueError(_("server does not advertise changegroup version," |
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231 " can't negotiate support for ellipsis nodes")) |
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232 |
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233 include = sorted(filter(bool, kwargs.get('includepats', []))) |
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234 exclude = sorted(filter(bool, kwargs.get('excludepats', []))) |
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235 newmatch = narrowspec.match(repo.root, include=include, exclude=exclude) |
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236 if not repo.ui.configbool("experimental", "narrowservebrokenellipses"): |
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237 outgoing = exchange._computeoutgoing(repo, heads, common) |
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238 if not outgoing.missing: |
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239 return |
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240 def wrappedgetbundler(orig, *args, **kwargs): |
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241 bundler = orig(*args, **kwargs) |
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242 bundler._narrow_matcher = lambda : newmatch |
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243 return bundler |
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244 with extensions.wrappedfunction(changegroup, 'getbundler', |
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245 wrappedgetbundler): |
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246 cg = changegroup.makestream(repo, outgoing, version, source) |
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247 part = bundler.newpart('changegroup', data=cg) |
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248 part.addparam('version', version) |
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249 if 'treemanifest' in repo.requirements: |
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250 part.addparam('treemanifest', '1') |
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251 |
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252 if include or exclude: |
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253 narrowspecpart = bundler.newpart(_SPECPART) |
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254 if include: |
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255 narrowspecpart.addparam( |
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256 _SPECPART_INCLUDE, '\n'.join(include), mandatory=True) |
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257 if exclude: |
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258 narrowspecpart.addparam( |
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259 _SPECPART_EXCLUDE, '\n'.join(exclude), mandatory=True) |
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260 |
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261 return |
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262 |
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263 depth = kwargs.get('depth', None) |
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264 if depth is not None: |
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265 depth = int(depth) |
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266 if depth < 1: |
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267 raise error.Abort(_('depth must be positive, got %d') % depth) |
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268 |
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269 heads = set(heads or repo.heads()) |
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270 common = set(common or [nullid]) |
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271 oldinclude = sorted(filter(bool, kwargs.get('oldincludepats', []))) |
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272 oldexclude = sorted(filter(bool, kwargs.get('oldexcludepats', []))) |
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273 known = {bin(n) for n in kwargs.get('known', [])} |
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274 if known and (oldinclude != include or oldexclude != exclude): |
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275 # Steps: |
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276 # 1. Send kill for "$known & ::common" |
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277 # |
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278 # 2. Send changegroup for ::common |
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279 # |
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280 # 3. Proceed. |
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281 # |
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282 # In the future, we can send kills for only the specific |
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283 # nodes we know should go away or change shape, and then |
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284 # send a data stream that tells the client something like this: |
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285 # |
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286 # a) apply this changegroup |
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287 # b) apply nodes XXX, YYY, ZZZ that you already have |
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288 # c) goto a |
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289 # |
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290 # until they've built up the full new state. |
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291 # Convert to revnums and intersect with "common". The client should |
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292 # have made it a subset of "common" already, but let's be safe. |
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293 known = set(repo.revs("%ln & ::%ln", known, common)) |
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294 # TODO: we could send only roots() of this set, and the |
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295 # list of nodes in common, and the client could work out |
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296 # what to strip, instead of us explicitly sending every |
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297 # single node. |
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298 deadrevs = known |
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299 def genkills(): |
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300 for r in deadrevs: |
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301 yield _KILLNODESIGNAL |
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302 yield repo.changelog.node(r) |
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303 yield _DONESIGNAL |
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304 bundler.newpart(_CHANGESPECPART, data=genkills()) |
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305 newvisit, newfull, newellipsis = _computeellipsis( |
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306 repo, set(), common, known, newmatch) |
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307 if newvisit: |
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308 cg = _packellipsischangegroup( |
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309 repo, common, newmatch, newfull, newellipsis, |
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310 newvisit, depth, source, version) |
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311 part = bundler.newpart('changegroup', data=cg) |
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312 part.addparam('version', version) |
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313 if 'treemanifest' in repo.requirements: |
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314 part.addparam('treemanifest', '1') |
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315 |
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316 visitnodes, relevant_nodes, ellipsisroots = _computeellipsis( |
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317 repo, common, heads, set(), newmatch, depth=depth) |
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318 |
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319 repo.ui.debug('Found %d relevant revs\n' % len(relevant_nodes)) |
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320 if visitnodes: |
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321 cg = _packellipsischangegroup( |
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322 repo, common, newmatch, relevant_nodes, ellipsisroots, |
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323 visitnodes, depth, source, version) |
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324 part = bundler.newpart('changegroup', data=cg) |
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325 part.addparam('version', version) |
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326 if 'treemanifest' in repo.requirements: |
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327 part.addparam('treemanifest', '1') |
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328 |
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329 def applyacl_narrow(repo, kwargs): |
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330 username = repo.ui.shortuser(repo.ui.username()) |
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331 user_includes = repo.ui.configlist( |
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332 _NARROWACL_SECTION, username + '.includes', |
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333 repo.ui.configlist(_NARROWACL_SECTION, 'default.includes')) |
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334 user_excludes = repo.ui.configlist( |
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335 _NARROWACL_SECTION, username + '.excludes', |
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336 repo.ui.configlist(_NARROWACL_SECTION, 'default.excludes')) |
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337 if not user_includes: |
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338 raise error.Abort(_("{} configuration for user {} is empty") |
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339 .format(_NARROWACL_SECTION, username)) |
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340 |
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341 user_includes = [ |
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342 'path:.' if p == '*' else 'path:' + p for p in user_includes] |
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343 user_excludes = [ |
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344 'path:.' if p == '*' else 'path:' + p for p in user_excludes] |
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345 |
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346 req_includes = set(kwargs.get('includepats', [])) |
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347 req_excludes = set(kwargs.get('excludepats', [])) |
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348 |
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349 req_includes, req_excludes, invalid_includes = narrowspec.restrictpatterns( |
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350 req_includes, req_excludes, user_includes, user_excludes) |
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351 |
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352 if invalid_includes: |
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353 raise error.Abort( |
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354 _("The following includes are not accessible for {}: {}") |
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355 .format(username, invalid_includes)) |
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356 |
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357 new_args = {} |
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358 new_args.update(kwargs) |
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359 new_args['includepats'] = req_includes |
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360 if req_excludes: |
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361 new_args['excludepats'] = req_excludes |
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362 return new_args |
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363 |
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364 @bundle2.parthandler(_SPECPART, (_SPECPART_INCLUDE, _SPECPART_EXCLUDE)) |
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365 def _handlechangespec_2(op, inpart): |
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366 includepats = set(inpart.params.get(_SPECPART_INCLUDE, '').splitlines()) |
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367 excludepats = set(inpart.params.get(_SPECPART_EXCLUDE, '').splitlines()) |
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368 narrowspec.save(op.repo, includepats, excludepats) |
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369 if not narrowrepo.REQUIREMENT in op.repo.requirements: |
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370 op.repo.requirements.add(narrowrepo.REQUIREMENT) |
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371 op.repo._writerequirements() |
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372 op.repo.invalidate(clearfilecache=True) |
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373 |
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374 @bundle2.parthandler(_CHANGESPECPART) |
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375 def _handlechangespec(op, inpart): |
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376 repo = op.repo |
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377 cl = repo.changelog |
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378 |
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379 # changesets which need to be stripped entirely. either they're no longer |
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380 # needed in the new narrow spec, or the server is sending a replacement |
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381 # in the changegroup part. |
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382 clkills = set() |
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383 |
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384 # A changespec part contains all the updates to ellipsis nodes |
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385 # that will happen as a result of widening or narrowing a |
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386 # repo. All the changes that this block encounters are ellipsis |
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387 # nodes or flags to kill an existing ellipsis. |
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388 chunksignal = changegroup.readexactly(inpart, 4) |
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389 while chunksignal != _DONESIGNAL: |
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390 if chunksignal == _KILLNODESIGNAL: |
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391 # a node used to be an ellipsis but isn't anymore |
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392 ck = changegroup.readexactly(inpart, 20) |
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393 if cl.hasnode(ck): |
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394 clkills.add(ck) |
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395 else: |
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396 raise error.Abort( |
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397 _('unexpected changespec node chunk type: %s') % chunksignal) |
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398 chunksignal = changegroup.readexactly(inpart, 4) |
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399 |
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400 if clkills: |
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401 # preserve bookmarks that repair.strip() would otherwise strip |
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402 bmstore = repo._bookmarks |
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403 class dummybmstore(dict): |
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404 def applychanges(self, repo, tr, changes): |
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405 pass |
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406 def recordchange(self, tr): # legacy version |
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407 pass |
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408 repo._bookmarks = dummybmstore() |
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409 chgrpfile = repair.strip(op.ui, repo, list(clkills), backup=True, |
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410 topic='widen') |
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411 repo._bookmarks = bmstore |
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412 if chgrpfile: |
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413 # presence of _widen_bundle attribute activates widen handler later |
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414 op._widen_bundle = chgrpfile |
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415 # Set the new narrowspec if we're widening. The setnewnarrowpats() method |
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416 # will currently always be there when using the core+narrowhg server, but |
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417 # other servers may include a changespec part even when not widening (e.g. |
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418 # because we're deepening a shallow repo). |
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419 if util.safehasattr(repo, 'setnewnarrowpats'): |
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420 repo.setnewnarrowpats() |
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421 |
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422 def handlechangegroup_widen(op, inpart): |
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423 """Changegroup exchange handler which restores temporarily-stripped nodes""" |
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424 # We saved a bundle with stripped node data we must now restore. |
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425 # This approach is based on mercurial/repair.py@6ee26a53c111. |
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426 repo = op.repo |
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427 ui = op.ui |
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428 |
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429 chgrpfile = op._widen_bundle |
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430 del op._widen_bundle |
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431 vfs = repo.vfs |
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432 |
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433 ui.note(_("adding branch\n")) |
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434 f = vfs.open(chgrpfile, "rb") |
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435 try: |
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436 gen = exchange.readbundle(ui, f, chgrpfile, vfs) |
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437 if not ui.verbose: |
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438 # silence internal shuffling chatter |
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439 ui.pushbuffer() |
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440 if isinstance(gen, bundle2.unbundle20): |
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441 with repo.transaction('strip') as tr: |
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442 bundle2.processbundle(repo, gen, lambda: tr) |
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443 else: |
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444 gen.apply(repo, 'strip', 'bundle:' + vfs.join(chgrpfile), True) |
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445 if not ui.verbose: |
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446 ui.popbuffer() |
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447 finally: |
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448 f.close() |
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449 |
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450 # remove undo files |
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451 for undovfs, undofile in repo.undofiles(): |
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452 try: |
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453 undovfs.unlink(undofile) |
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454 except OSError as e: |
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455 if e.errno != errno.ENOENT: |
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456 ui.warn(_('error removing %s: %s\n') % |
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457 (undovfs.join(undofile), str(e))) |
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458 |
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459 # Remove partial backup only if there were no exceptions |
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460 vfs.unlink(chgrpfile) |
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461 |
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462 def setup(): |
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463 """Enable narrow repo support in bundle2-related extension points.""" |
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464 extensions.wrapfunction(bundle2, 'getrepocaps', getrepocaps_narrow) |
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465 |
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466 wireproto.gboptsmap['narrow'] = 'boolean' |
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467 wireproto.gboptsmap['depth'] = 'plain' |
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468 wireproto.gboptsmap['oldincludepats'] = 'csv' |
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469 wireproto.gboptsmap['oldexcludepats'] = 'csv' |
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470 wireproto.gboptsmap['includepats'] = 'csv' |
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471 wireproto.gboptsmap['excludepats'] = 'csv' |
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472 wireproto.gboptsmap['known'] = 'csv' |
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473 |
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474 # Extend changegroup serving to handle requests from narrow clients. |
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475 origcgfn = exchange.getbundle2partsmapping['changegroup'] |
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476 def wrappedcgfn(*args, **kwargs): |
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477 repo = args[1] |
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478 if repo.ui.has_section(_NARROWACL_SECTION): |
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479 getbundlechangegrouppart_narrow( |
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480 *args, **applyacl_narrow(repo, kwargs)) |
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481 elif kwargs.get('narrow', False): |
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482 getbundlechangegrouppart_narrow(*args, **kwargs) |
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483 else: |
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484 origcgfn(*args, **kwargs) |
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485 exchange.getbundle2partsmapping['changegroup'] = wrappedcgfn |
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486 |
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487 # Extend changegroup receiver so client can fixup after widen requests. |
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488 origcghandler = bundle2.parthandlermapping['changegroup'] |
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489 def wrappedcghandler(op, inpart): |
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490 origcghandler(op, inpart) |
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491 if util.safehasattr(op, '_widen_bundle'): |
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492 handlechangegroup_widen(op, inpart) |
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493 wrappedcghandler.params = origcghandler.params |
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494 bundle2.parthandlermapping['changegroup'] = wrappedcghandler |