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annotate mercurial/discovery.py @ 13742:7abab875e647

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discovery: avoid discovery when local graph is a subset of remote Immediately sends local's heads to the server to check whether the server knows them all. If it does, we can call getbundle immediately. Interesting test output changes are: - added 1 changesets with 0 changes to 1 files (+1 heads) + added 1 changesets with 0 changes to 0 files (+1 heads) -> The new getbundle() actually fixes a bug vs. changegroupsubset() in that it no longer returns unnecessary files when file revs are reused. warning: repository is unrelated + requesting all changes -> The new use of common instead of bases correctly indicates that an unrelated pull gets all changes from the server.
author Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
date Wed, 23 Mar 2011 16:06:55 +0100
parents 91cb08a9e7fb
children 72c84f24b420
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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, error
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11
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12 def findcommonincoming(repo, remote, heads=None, force=False, commononly=False):
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13 """Return a tuple (common, missing, heads) used to identify missing nodes
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14 from remote. "missing" is either a boolean indicating if any nodes are missing
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15 (when commononly=True), or else a list of the root nodes of the missing set.
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16
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17 If a list of heads is specified, return only nodes which are heads
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18 or ancestors of these heads.
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19 """
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20 m = repo.changelog.nodemap
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21 search = []
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22 fetch = set()
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23 seen = set()
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24 seenbranch = set()
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25 base = set()
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26
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27 if not heads:
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28 heads = remote.heads()
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29
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30 if repo.changelog.tip() == nullid:
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31 base.add(nullid)
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32 if heads != [nullid]:
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33 return [nullid], [nullid], list(heads)
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34 return [nullid], [], []
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35
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36 # assume we're closer to the tip than the root
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37 # and start by examining the heads
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38 repo.ui.status(_("searching for changes\n"))
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39
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40 if commononly:
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41 myheads = repo.heads()
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42 known = remote.known(myheads)
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43 if util.all(known):
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44 hasincoming = set(heads).difference(set(myheads)) and True
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45 return myheads, hasincoming, heads
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46
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47 unknown = []
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48 for h in heads:
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49 if h not in m:
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50 unknown.append(h)
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51 else:
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52 base.add(h)
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53
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54 heads = unknown
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55 if not unknown:
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56 return list(base), [], []
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57
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58 req = set(unknown)
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59 reqcnt = 0
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60
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61 # search through remote branches
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62 # a 'branch' here is a linear segment of history, with four parts:
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63 # head, root, first parent, second parent
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64 # (a branch always has two parents (or none) by definition)
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65 unknown = remote.branches(unknown)
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66 while unknown:
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67 r = []
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68 while unknown:
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69 n = unknown.pop(0)
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70 if n[0] in seen:
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71 continue
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72
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73 repo.ui.debug("examining %s:%s\n"
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74 % (short(n[0]), short(n[1])))
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75 if n[0] == nullid: # found the end of the branch
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76 pass
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77 elif n in seenbranch:
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78 repo.ui.debug("branch already found\n")
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79 continue
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80 elif n[1] and n[1] in m: # do we know the base?
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81 repo.ui.debug("found incomplete branch %s:%s\n"
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82 % (short(n[0]), short(n[1])))
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83 search.append(n[0:2]) # schedule branch range for scanning
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84 seenbranch.add(n)
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85 else:
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86 if n[1] not in seen and n[1] not in fetch:
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87 if n[2] in m and n[3] in m:
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88 repo.ui.debug("found new changeset %s\n" %
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89 short(n[1]))
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90 fetch.add(n[1]) # earliest unknown
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91 for p in n[2:4]:
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92 if p in m:
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93 base.add(p) # latest known
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94
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95 for p in n[2:4]:
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96 if p not in req and p not in m:
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97 r.append(p)
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98 req.add(p)
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99 seen.add(n[0])
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100
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101 if r:
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102 reqcnt += 1
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103 repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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104 repo.ui.debug("request %d: %s\n" %
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105 (reqcnt, " ".join(map(short, r))))
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106 for p in xrange(0, len(r), 10):
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107 for b in remote.branches(r[p:p + 10]):
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108 repo.ui.debug("received %s:%s\n" %
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109 (short(b[0]), short(b[1])))
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110 unknown.append(b)
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111
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112 # do binary search on the branches we found
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113 while search:
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114 newsearch = []
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115 reqcnt += 1
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116 repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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117 for n, l in zip(search, remote.between(search)):
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118 l.append(n[1])
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119 p = n[0]
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120 f = 1
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121 for i in l:
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122 repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i)))
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123 if i in m:
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124 if f <= 2:
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125 repo.ui.debug("found new branch changeset %s\n" %
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126 short(p))
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127 fetch.add(p)
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128 base.add(i)
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129 else:
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130 repo.ui.debug("narrowed branch search to %s:%s\n"
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131 % (short(p), short(i)))
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132 newsearch.append((p, i))
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133 break
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134 p, f = i, f * 2
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135 search = newsearch
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09a1ee498756 localrepo: add destroyed() method for strip/rollback to use (issue548).
Greg Ward <greg-hg@gerg.ca>
parents: 9149
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136
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137 # sanity check our fetch list
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138 for f in fetch:
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139 if f in m:
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140 raise error.RepoError(_("already have changeset ")
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141 + short(f[:4]))
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142
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143 base = list(base)
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144 if base == [nullid]:
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145 if force:
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146 repo.ui.warn(_("warning: repository is unrelated\n"))
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147 else:
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148 raise util.Abort(_("repository is unrelated"))
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149
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150 repo.ui.debug("found new changesets starting at " +
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151 " ".join([short(f) for f in fetch]) + "\n")
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Vadim Gelfer <vadim.gelfer@gmail.com>
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152
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153 repo.ui.progress(_('searching'), None)
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154 repo.ui.debug("%d total queries\n" % reqcnt)
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155
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156 return base, list(fetch), heads
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157
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158 def findoutgoing(repo, remote, base=None, remoteheads=None, force=False):
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159 """Return list of nodes that are roots of subsets not in remote
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mpm@selenic.com
parents:
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160
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161 If base dict is specified, assume that these nodes and their parents
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162 exist on the remote side.
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163 If remotehead is specified, assume it is the list of the heads from
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164 the remote repository.
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165 """
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166 if base is None:
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167 base = findcommonincoming(repo, remote, heads=remoteheads,
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168 force=force)[0]
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169 else:
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170 base = list(base)
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171
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172 repo.ui.debug("common changesets up to "
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173 + " ".join(map(short, base)) + "\n")
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174
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175 remain = set(repo.changelog.nodemap)
148
c32286d0a665 Improve pruning of branches in outstanding changeset algorithm
mpm@selenic.com
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176
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177 # prune everything remote has from the tree
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178 remain.remove(nullid)
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179 remove = base
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180 while remove:
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181 n = remove.pop(0)
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182 if n in remain:
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183 remain.remove(n)
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184 for p in repo.changelog.parents(n):
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185 remove.append(p)
65
d40cc5aacc31 Fix up a bunch of bugs in the new merge code
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186
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187 # find every node whose parents have been pruned
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188 subset = []
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189 # find every remote head that will get new children
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190 for n in remain:
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191 p1, p2 = repo.changelog.parents(n)
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192 if p1 not in remain and p2 not in remain:
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193 subset.append(n)
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6163ef936a00 protocol: use changegroupsubset() if possible (issue1389)
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194
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195 return subset
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196
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197 def prepush(repo, remote, force, revs, newbranch):
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198 '''Analyze the local and remote repositories and determine which
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199 changesets need to be pushed to the remote. Return value depends
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200 on circumstances:
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36b6b5ef7820 prepush: rename variables, refactor
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201
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202 If we are not going to push anything, return a tuple (None,
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203 outgoing) where outgoing is 0 if there are no outgoing
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204 changesets and 1 if there are, but we refuse to push them
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205 (e.g. would create new remote heads).
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206
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207 Otherwise, return a tuple (changegroup, remoteheads), where
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208 changegroup is a readable file-like object whose read() returns
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209 successive changegroup chunks ready to be sent over the wire and
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diff changeset
210 remoteheads is the list of remote heads.'''
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211 remoteheads = remote.heads()
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212 common, inc, rheads = findcommonincoming(repo, remote, heads=remoteheads,
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213 force=force)
2439
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parents: 2424
diff changeset
214
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215 cl = repo.changelog
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216 update = findoutgoing(repo, remote, common, remoteheads)
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217 outg, bases, heads = cl.nodesbetween(update, revs)
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parents: 2424
diff changeset
218
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219 if not bases:
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220 repo.ui.status(_("no changes found\n"))
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221 return None, 1
622
e9fe5d5e67f7 Add generic repo commands for pull and push
Matt Mackall <mpm@selenic.com>
parents: 621
diff changeset
222
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223 if not force and remoteheads != [nullid]:
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224 if remote.capable('branchmap'):
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225 # Check for each named branch if we're creating new remote heads.
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226 # To be a remote head after push, node must be either:
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227 # - unknown locally
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228 # - a local outgoing head descended from update
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229 # - a remote head that's known locally and not
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230 # ancestral to an outgoing head
10405
2d30d66a89ad whitespace cleanup
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 10396
diff changeset
231
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232 # 1. Create set of branches involved in the push.
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233 branches = set(repo[n].branch() for n in outg)
1466
b6d9ea0bc107 Added a lot of comments to changegroupsubset.
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parents: 1464
diff changeset
234
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235 # 2. Check for new branches on the remote.
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236 remotemap = remote.branchmap()
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237 newbranches = branches - set(remotemap)
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238 if newbranches and not newbranch: # new branch requires --new-branch
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Martin Geisler <mg@aragost.com>
parents: 11313
diff changeset
239 branchnames = ', '.join(sorted(newbranches))
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240 raise util.Abort(_("push creates new remote branches: %s!")
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diff changeset
241 % branchnames,
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diff changeset
242 hint=_("use 'hg push --new-branch' to create"
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diff changeset
243 " new remote branches"))
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diff changeset
244 branches.difference_update(newbranches)
1458
1033892bbb87 This changes the revlog.group and re-implements the localrepo.changeroup
Eric Hopper <hopper@omnifarious.org>
parents: 1457
diff changeset
245
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246 # 3. Construct the initial oldmap and newmap dicts.
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247 # They contain information about the remote heads before and
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248 # after the push, respectively.
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249 # Heads not found locally are not included in either dict,
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250 # since they won't be affected by the push.
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251 # unsynced contains all branches with incoming changesets.
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252 oldmap = {}
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253 newmap = {}
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254 unsynced = set()
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255 for branch in branches:
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diff changeset
256 remotebrheads = remotemap[branch]
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diff changeset
257 prunedbrheads = [h for h in remotebrheads if h in cl.nodemap]
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diff changeset
258 oldmap[branch] = prunedbrheads
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259 newmap[branch] = list(prunedbrheads)
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260 if len(remotebrheads) > len(prunedbrheads):
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261 unsynced.add(branch)
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262
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263 # 4. Update newmap with outgoing changes.
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264 # This will possibly add new heads and remove existing ones.
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265 ctxgen = (repo[n] for n in outg)
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266 repo._updatebranchcache(newmap, ctxgen)
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65cc17ae9649 fix race in localrepo.addchangegroup.
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267
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268 else:
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269 # 1-4b. old servers: Check for new topological heads.
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270 # Construct {old,new}map with branch = None (topological branch).
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271 # (code based on _updatebranchcache)
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272 oldheads = set(h for h in remoteheads if h in cl.nodemap)
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273 newheads = oldheads.union(outg)
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274 if len(newheads) > 1:
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275 for latest in reversed(outg):
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276 if latest not in newheads:
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277 continue
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278 minhrev = min(cl.rev(h) for h in newheads)
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279 reachable = cl.reachable(latest, cl.node(minhrev))
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280 reachable.remove(latest)
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281 newheads.difference_update(reachable)
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282 branches = set([None])
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283 newmap = {None: newheads}
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284 oldmap = {None: oldheads}
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285 unsynced = inc and branches or set()
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286
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287 # 5. Check for new heads.
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288 # If there are more heads after the push than before, a suitable
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289 # error message, depending on unsynced status, is displayed.
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290 error = None
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291 for branch in branches:
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292 newhs = set(newmap[branch])
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293 oldhs = set(oldmap[branch])
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294 if len(newhs) > len(oldhs):
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295 if error is None:
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296 if branch:
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297 error = _("push creates new remote heads "
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298 "on branch '%s'!") % branch
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299 else:
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300 error = _("push creates new remote heads!")
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301 if branch in unsynced:
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302 hint = _("you should pull and merge or "
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303 "use push -f to force")
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304 else:
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305 hint = _("did you forget to merge? "
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306 "use push -f to force")
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307 if branch:
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308 repo.ui.debug("new remote heads on branch '%s'\n" % branch)
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309 for h in (newhs - oldhs):
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310 repo.ui.debug("new remote head %s\n" % short(h))
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311 if error:
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312 raise util.Abort(error, hint=hint)
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313
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314 # 6. Check for unsynced changes on involved branches.
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315 if unsynced:
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316 repo.ui.warn(_("note: unsynced remote changes!\n"))
515
03f27b1381f9 Whitespace cleanups
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317
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318 if revs is None:
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319 # use the fast path, no race possible on push
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320 nodes = repo.changelog.findmissing(common)
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321 cg = repo._changegroup(nodes, 'push')
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322 else:
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323 cg = repo.changegroupsubset(update, revs, 'push')
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324 return cg, remoteheads