Mercurial > public > mercurial-scm > hg

annotate mercurial/discovery.py @ 15713:cff25e4b37d2

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phases: do not exchange secret changesets Any secret changesets will be excluded from pull and push. Phase data are properly synchronized on pull and push if a changeset is seen as secret locally but is non-secret remote side. This patch does not handle the case of a changeset secret on remote but known locally.
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
date Thu, 22 Dec 2011 00:42:25 +0100
parents 646759147717
children cd956049fc14
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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
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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 node import nullid, short
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9 from i18n import _
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10 import util, setdiscovery, treediscovery
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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 def findcommonoutgoing(repo, other, onlyheads=None, force=False, commoninc=None):
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50 '''Return a tuple (common, anyoutgoing, heads) used to identify the set
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51 of nodes present in repo but not in other.
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52
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53 If onlyheads is given, only nodes ancestral to nodes in onlyheads (inclusive)
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54 are included. If you already know the local repo's heads, passing them in
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55 onlyheads is faster than letting them be recomputed here.
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56
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57 If commoninc is given, it must the the result of a prior call to
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58 findcommonincoming(repo, other, force) to avoid recomputing it here.
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59
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60 The returned tuple is meant to be passed to changelog.findmissing.'''
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61 common, _any, _hds = commoninc or findcommonincoming(repo, other, force=force)
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62 return (common, onlyheads or repo.heads())
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63
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64 def prepush(repo, remote, force, revs, newbranch):
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65 '''Analyze the local and remote repositories and determine which
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66 changesets need to be pushed to the remote. Return value depends
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67 on circumstances:
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68
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69 If we are not going to push anything, return a tuple (None,
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70 outgoing, common) where outgoing is 0 if there are no outgoing
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71 changesets and 1 if there are, but we refuse to push them
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72 (e.g. would create new remote heads). The third element "common"
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73 is the list of heads of the common set between local and remote.
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74
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75 Otherwise, return a tuple (changegroup, remoteheads, futureheads),
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76 where changegroup is a readable file-like object whose read()
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77 returns successive changegroup chunks ready to be sent over the
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78 wire, remoteheads is the list of remote heads and futureheads is
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79 the list of heads of the common set between local and remote to
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80 be after push completion.
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81 '''
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82 commoninc = findcommonincoming(repo, remote, force=force)
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83 common, revs = findcommonoutgoing(repo, remote, onlyheads=revs,
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84 commoninc=commoninc, force=force)
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85 _common, inc, remoteheads = commoninc
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86
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87 cl = repo.changelog
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88 alloutg = cl.findmissing(common, revs)
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89 outg = []
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90 secret = []
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91 for o in alloutg:
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92 if repo[o].phase() >= 2:
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93 secret.append(o)
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94 else:
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95 outg.append(o)
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96
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97 if not outg:
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98 if secret:
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99 repo.ui.status(_("no changes to push but %i secret changesets\n")
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100 % len(secret))
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101 else:
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102 repo.ui.status(_("no changes found\n"))
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103 return None, 1, common
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104
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105 if secret:
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106 # recompute target revs
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107 revs = [ctx.node() for ctx in repo.set('heads(::(%ld))',
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108 map(repo.changelog.rev, outg))]
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109
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110 if not force and remoteheads != [nullid]:
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111 if remote.capable('branchmap'):
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112 # Check for each named branch if we're creating new remote heads.
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113 # To be a remote head after push, node must be either:
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114 # - unknown locally
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115 # - a local outgoing head descended from update
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116 # - a remote head that's known locally and not
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117 # ancestral to an outgoing head
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118
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119 # 1. Create set of branches involved in the push.
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120 branches = set(repo[n].branch() for n in outg)
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121
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122 # 2. Check for new branches on the remote.
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123 remotemap = remote.branchmap()
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124 newbranches = branches - set(remotemap)
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125 if newbranches and not newbranch: # new branch requires --new-branch
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Martin Geisler <mg@aragost.com>
parents: 11313
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126 branchnames = ', '.join(sorted(newbranches))
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127 raise util.Abort(_("push creates new remote branches: %s!")
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128 % branchnames,
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129 hint=_("use 'hg push --new-branch' to create"
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130 " new remote branches"))
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131 branches.difference_update(newbranches)
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1033892bbb87 This changes the revlog.group and re-implements the localrepo.changeroup
Eric Hopper <hopper@omnifarious.org>
parents: 1457
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132
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133 # 3. Construct the initial oldmap and newmap dicts.
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134 # They contain information about the remote heads before and
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135 # after the push, respectively.
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136 # Heads not found locally are not included in either dict,
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137 # since they won't be affected by the push.
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138 # unsynced contains all branches with incoming changesets.
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139 oldmap = {}
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140 newmap = {}
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141 unsynced = set()
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142 for branch in branches:
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143 remotebrheads = remotemap[branch]
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144 prunedbrheads = [h for h in remotebrheads if h in cl.nodemap]
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145 oldmap[branch] = prunedbrheads
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146 newmap[branch] = list(prunedbrheads)
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147 if len(remotebrheads) > len(prunedbrheads):
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148 unsynced.add(branch)
635
85e2209d401c Protocol switch from using generators to stream-like objects.
Matt Mackall <mpm@selenic.com>
parents: 634
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149
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150 # 4. Update newmap with outgoing changes.
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151 # This will possibly add new heads and remove existing ones.
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152 ctxgen = (repo[n] for n in outg)
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153 repo._updatebranchcache(newmap, ctxgen)
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65cc17ae9649 fix race in localrepo.addchangegroup.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1995
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154
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155 else:
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156 # 1-4b. old servers: Check for new topological heads.
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157 # Construct {old,new}map with branch = None (topological branch).
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158 # (code based on _updatebranchcache)
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159 oldheads = set(h for h in remoteheads if h in cl.nodemap)
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160 newheads = oldheads.union(outg)
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161 if len(newheads) > 1:
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162 for latest in reversed(outg):
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163 if latest not in newheads:
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164 continue
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165 minhrev = min(cl.rev(h) for h in newheads)
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166 reachable = cl.reachable(latest, cl.node(minhrev))
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167 reachable.remove(latest)
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168 newheads.difference_update(reachable)
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169 branches = set([None])
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170 newmap = {None: newheads}
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171 oldmap = {None: oldheads}
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172 unsynced = inc and branches or set()
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173
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174 # 5. Check for new heads.
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175 # If there are more heads after the push than before, a suitable
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176 # error message, depending on unsynced status, is displayed.
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177 error = None
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178 for branch in branches:
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179 newhs = set(newmap[branch])
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180 oldhs = set(oldmap[branch])
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181 if len(newhs) > len(oldhs):
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182 dhs = list(newhs - oldhs)
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183 if error is None:
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Pierre-Yves David <pierre-yves.david@logilab.fr>
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184 if branch not in ('default', None):
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185 error = _("push creates new remote head %s "
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186 "on branch '%s'!") % (short(dhs[0]), branch)
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187 else:
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188 error = _("push creates new remote head %s!"
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189 ) % short(dhs[0])
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190 if branch in unsynced:
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191 hint = _("you should pull and merge or "
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192 "use push -f to force")
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193 else:
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194 hint = _("did you forget to merge? "
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195 "use push -f to force")
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Pierre-Yves David <pierre-yves.david@logilab.fr>
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196 if branch is not None:
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Mads Kiilerich <mads@kiilerich.com>
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197 repo.ui.note(_("new remote heads on branch '%s'\n") % branch)
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198 for h in dhs:
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199 repo.ui.note(_("new remote head %s\n") % short(h))
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200 if error:
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201 raise util.Abort(error, hint=hint)
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202
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203 # 6. Check for unsynced changes on involved branches.
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204 if unsynced:
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205 repo.ui.warn(_("note: unsynced remote changes!\n"))
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 514
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206
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207 if revs is None:
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208 # use the fast path, no race possible on push
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 13742
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209 cg = repo._changegroup(outg, 'push')
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210 else:
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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211 cg = repo.getbundle('push', heads=revs, common=common)
15485
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212 # no need to compute outg ancestor. All node in outg have either:
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213 # - parents in outg
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214 # - parents in common
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215 # - nullid parent
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216 rset = repo.set('heads(%ln + %ln)', common, outg)
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217 futureheads = [ctx.node() for ctx in rset]
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diff changeset
218 return cg, remoteheads, futureheads