Mercurial > hg
annotate mercurial/discovery.py @ 15908:60cb4f381a78
bookmarks: backout locking change in 12dea4d998ec
Repo lock only applies to data in .hg/store/
author | Matt Mackall <mpm@selenic.com> |
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date | Wed, 18 Jan 2012 14:56:52 -0600 |
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1 # discovery.py - protocol changeset discovery functions |
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2 # |
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3 # Copyright 2010 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from node import nullid, short |
3891 | 9 from i18n import _ |
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10 import util, setdiscovery, treediscovery, phases |
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11 |
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12 def findcommonincoming(repo, remote, heads=None, force=False): |
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13 """Return a tuple (common, anyincoming, heads) used to identify the common |
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14 subset of nodes between repo and remote. |
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15 |
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16 "common" is a list of (at least) the heads of the common subset. |
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17 "anyincoming" is testable as a boolean indicating if any nodes are missing |
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18 locally. If remote does not support getbundle, this actually is a list of |
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19 roots of the nodes that would be incoming, to be supplied to |
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20 changegroupsubset. No code except for pull should be relying on this fact |
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21 any longer. |
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22 "heads" is either the supplied heads, or else the remote's heads. |
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23 |
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24 If you pass heads and they are all known locally, the reponse lists justs |
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25 these heads in "common" and in "heads". |
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26 |
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27 Please use findcommonoutgoing to compute the set of outgoing nodes to give |
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28 extensions a good hook into outgoing. |
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29 """ |
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30 |
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31 if not remote.capable('getbundle'): |
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32 return treediscovery.findcommonincoming(repo, remote, heads, force) |
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33 |
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34 if heads: |
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35 allknown = True |
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36 nm = repo.changelog.nodemap |
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37 for h in heads: |
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38 if nm.get(h) is None: |
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39 allknown = False |
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40 break |
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41 if allknown: |
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42 return (heads, False, heads) |
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43 |
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44 res = setdiscovery.findcommonheads(repo.ui, repo, remote, |
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45 abortwhenunrelated=not force) |
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46 common, anyinc, srvheads = res |
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47 return (list(common), anyinc, heads or list(srvheads)) |
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48 |
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49 class outgoing(object): |
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50 '''Represents the set of nodes present in a local repo but not in a |
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51 (possibly) remote one. |
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52 |
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53 Members: |
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54 |
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55 missing is a list of all nodes present in local but not in remote. |
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56 common is a list of all nodes shared between the two repos. |
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57 excluded is the list of missing changeset that shouldn't be sent remotely. |
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58 missingheads is the list of heads of missing. |
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59 commonheads is the list of heads of common. |
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60 |
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61 The sets are computed on demand from the heads, unless provided upfront |
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62 by discovery.''' |
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63 |
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64 def __init__(self, revlog, commonheads, missingheads): |
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65 self.commonheads = commonheads |
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66 self.missingheads = missingheads |
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67 self._revlog = revlog |
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68 self._common = None |
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69 self._missing = None |
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70 self.excluded = [] |
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71 |
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72 def _computecommonmissing(self): |
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73 sets = self._revlog.findcommonmissing(self.commonheads, |
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74 self.missingheads) |
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75 self._common, self._missing = sets |
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76 |
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77 @util.propertycache |
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78 def common(self): |
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79 if self._common is None: |
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80 self._computecommonmissing() |
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81 return self._common |
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82 |
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83 @util.propertycache |
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84 def missing(self): |
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85 if self._missing is None: |
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86 self._computecommonmissing() |
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87 return self._missing |
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88 |
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89 def findcommonoutgoing(repo, other, onlyheads=None, force=False, commoninc=None): |
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90 '''Return an outgoing instance to identify the nodes present in repo but |
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91 not in other. |
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92 |
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93 If onlyheads is given, only nodes ancestral to nodes in onlyheads (inclusive) |
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94 are included. If you already know the local repo's heads, passing them in |
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95 onlyheads is faster than letting them be recomputed here. |
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96 |
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97 If commoninc is given, it must the the result of a prior call to |
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98 findcommonincoming(repo, other, force) to avoid recomputing it here.''' |
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99 # declare an empty outgoing object to be filled later |
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100 og = outgoing(repo.changelog, None, None) |
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101 |
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102 # get common set if not provided |
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103 if commoninc is None: |
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104 commoninc = findcommonincoming(repo, other, force=force) |
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105 og.commonheads, _any, _hds = commoninc |
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106 |
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107 # compute outgoing |
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108 if not repo._phaseroots[phases.secret]: |
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109 og.missingheads = onlyheads or repo.heads() |
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110 elif onlyheads is None: |
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111 # use visible heads as it should be cached |
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112 og.missingheads = phases.visibleheads(repo) |
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113 og.excluded = [ctx.node() for ctx in repo.set('secret()')] |
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114 else: |
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115 # compute common, missing and exclude secret stuff |
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116 sets = repo.changelog.findcommonmissing(og.commonheads, onlyheads) |
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117 og._common, allmissing = sets |
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118 og._missing = missing = [] |
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119 og._excluded = excluded = [] |
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120 for node in allmissing: |
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121 if repo[node].phase() >= phases.secret: |
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122 excluded.append(node) |
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123 else: |
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124 missing.append(node) |
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125 if excluded: |
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126 # update missing heads |
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127 rset = repo.set('heads(%ln)', missing) |
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128 missingheads = [ctx.node() for ctx in rset] |
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129 else: |
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130 missingheads = onlyheads |
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131 og.missingheads = missingheads |
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132 |
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133 return og |
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134 |
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135 def prepush(repo, remote, force, revs, newbranch): |
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136 '''Analyze the local and remote repositories and determine which |
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137 changesets need to be pushed to the remote. Return value depends |
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138 on circumstances: |
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139 |
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140 If we are not going to push anything, return a tuple (None, 1, |
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141 common) The third element "common" is the list of heads of the |
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142 common set between local and remote. |
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143 |
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144 Otherwise, return a tuple (changegroup, remoteheads, futureheads), |
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145 where changegroup is a readable file-like object whose read() |
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146 returns successive changegroup chunks ready to be sent over the |
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147 wire, remoteheads is the list of remote heads and futureheads is |
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148 the list of heads of the common set between local and remote to |
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149 be after push completion. |
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150 ''' |
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151 commoninc = findcommonincoming(repo, remote, force=force) |
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152 outgoing = findcommonoutgoing(repo, remote, onlyheads=revs, |
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153 commoninc=commoninc, force=force) |
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154 _common, inc, remoteheads = commoninc |
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155 |
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156 cl = repo.changelog |
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157 outg = outgoing.missing |
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158 common = outgoing.commonheads |
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159 |
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160 if not outg: |
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161 if outgoing.excluded: |
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162 repo.ui.status(_("no changes to push but %i secret changesets\n") |
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163 % len(outgoing.excluded)) |
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164 else: |
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165 repo.ui.status(_("no changes found\n")) |
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166 return None, 1, common |
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167 |
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168 if not force and remoteheads != [nullid]: |
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169 if remote.capable('branchmap'): |
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170 # Check for each named branch if we're creating new remote heads. |
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171 # To be a remote head after push, node must be either: |
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172 # - unknown locally |
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173 # - a local outgoing head descended from update |
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174 # - a remote head that's known locally and not |
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175 # ancestral to an outgoing head |
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176 |
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177 # 1. Create set of branches involved in the push. |
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178 branches = set(repo[n].branch() for n in outg) |
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179 |
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180 # 2. Check for new branches on the remote. |
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181 remotemap = remote.branchmap() |
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182 newbranches = branches - set(remotemap) |
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183 if newbranches and not newbranch: # new branch requires --new-branch |
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184 branchnames = ', '.join(sorted(newbranches)) |
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185 raise util.Abort(_("push creates new remote branches: %s!") |
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186 % branchnames, |
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187 hint=_("use 'hg push --new-branch' to create" |
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188 " new remote branches")) |
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189 branches.difference_update(newbranches) |
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190 |
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191 # 3. Construct the initial oldmap and newmap dicts. |
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192 # They contain information about the remote heads before and |
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193 # after the push, respectively. |
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194 # Heads not found locally are not included in either dict, |
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195 # since they won't be affected by the push. |
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196 # unsynced contains all branches with incoming changesets. |
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197 oldmap = {} |
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198 newmap = {} |
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199 unsynced = set() |
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200 for branch in branches: |
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201 remotebrheads = remotemap[branch] |
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202 prunedbrheads = [h for h in remotebrheads if h in cl.nodemap] |
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203 oldmap[branch] = prunedbrheads |
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204 newmap[branch] = list(prunedbrheads) |
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205 if len(remotebrheads) > len(prunedbrheads): |
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206 unsynced.add(branch) |
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207 |
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208 # 4. Update newmap with outgoing changes. |
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209 # This will possibly add new heads and remove existing ones. |
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210 ctxgen = (repo[n] for n in outg) |
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211 repo._updatebranchcache(newmap, ctxgen) |
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212 |
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213 else: |
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214 # 1-4b. old servers: Check for new topological heads. |
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215 # Construct {old,new}map with branch = None (topological branch). |
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216 # (code based on _updatebranchcache) |
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217 oldheads = set(h for h in remoteheads if h in cl.nodemap) |
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218 newheads = oldheads.union(outg) |
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219 if len(newheads) > 1: |
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220 for latest in reversed(outg): |
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221 if latest not in newheads: |
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222 continue |
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223 minhrev = min(cl.rev(h) for h in newheads) |
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224 reachable = cl.reachable(latest, cl.node(minhrev)) |
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225 reachable.remove(latest) |
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226 newheads.difference_update(reachable) |
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227 branches = set([None]) |
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228 newmap = {None: newheads} |
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229 oldmap = {None: oldheads} |
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230 unsynced = inc and branches or set() |
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231 |
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232 # 5. Check for new heads. |
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233 # If there are more heads after the push than before, a suitable |
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234 # error message, depending on unsynced status, is displayed. |
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235 error = None |
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236 for branch in branches: |
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237 newhs = set(newmap[branch]) |
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238 oldhs = set(oldmap[branch]) |
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239 if len(newhs) > len(oldhs): |
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240 dhs = list(newhs - oldhs) |
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241 if error is None: |
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242 if branch not in ('default', None): |
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243 error = _("push creates new remote head %s " |
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244 "on branch '%s'!") % (short(dhs[0]), branch) |
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245 else: |
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246 error = _("push creates new remote head %s!" |
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247 ) % short(dhs[0]) |
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248 if branch in unsynced: |
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249 hint = _("you should pull and merge or " |
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250 "use push -f to force") |
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251 else: |
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252 hint = _("did you forget to merge? " |
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253 "use push -f to force") |
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254 if branch is not None: |
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255 repo.ui.note(_("new remote heads on branch '%s'\n") % branch) |
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256 for h in dhs: |
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257 repo.ui.note(_("new remote head %s\n") % short(h)) |
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258 if error: |
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259 raise util.Abort(error, hint=hint) |
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260 |
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261 # 6. Check for unsynced changes on involved branches. |
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262 if unsynced: |
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263 repo.ui.warn(_("note: unsynced remote changes!\n")) |
515 | 264 |
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265 if revs is None and not outgoing.excluded: |
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266 # push everything, |
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267 # use the fast path, no race possible on push |
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268 cg = repo._changegroup(outg, 'push') |
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269 else: |
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270 cg = repo.getlocalbundle('push', outgoing) |
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271 # no need to compute outg ancestor. All node in outg have either: |
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272 # - parents in outg |
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273 # - parents in common |
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274 # - nullid parent |
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275 rset = repo.set('heads(%ln + %ln)', common, outg) |
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276 futureheads = [ctx.node() for ctx in rset] |
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277 return cg, remoteheads, futureheads |