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annotate mercurial/discovery.py @ 14073:72c84f24b420

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discovery: drop findoutgoing and simplify findcommonincoming's api This is a long desired cleanup and paves the way for new discovery. To specify subsets for bundling changes, all code should use the heads of the desired subset ("heads") and the heads of the common subset ("common") to be excluded from the bundled set. These can be used revlog.findmissing instead of revlog.nodesbetween. This fixes an actual bug exposed by the change in test-bundle-r.t where we try to bundle a changeset while specifying that said changeset is to be assumed already present in the target. This used to still bundle the changeset. It no longer does. This is similar to the bugs fixed by the recent switch to heads/common for incoming/pull.
author Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
date Sat, 30 Apr 2011 17:21:37 +0200
parents 7abab875e647
children cb98fed52495
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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):
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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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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
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25 m = repo.changelog.nodemap
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26 search = []
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27 fetch = set()
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28 seen = set()
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29 seenbranch = set()
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30 base = set()
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31
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32 if not heads:
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33 heads = remote.heads()
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34
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35 if repo.changelog.tip() == nullid:
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36 base.add(nullid)
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37 if heads != [nullid]:
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38 return [nullid], [nullid], list(heads)
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39 return [nullid], [], []
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40
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41 # assume we're closer to the tip than the root
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42 # and start by examining the heads
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43 repo.ui.status(_("searching for changes\n"))
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44
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45 if remote.capable('getbundle'):
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46 myheads = repo.heads()
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47 known = remote.known(myheads)
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48 if util.all(known):
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49 hasincoming = set(heads).difference(set(myheads)) and True
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50 return myheads, hasincoming, heads
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51
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52 unknown = []
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53 for h in heads:
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54 if h not in m:
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55 unknown.append(h)
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56 else:
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57 base.add(h)
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58
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59 heads = unknown
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60 if not unknown:
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61 return list(base), [], []
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62
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63 req = set(unknown)
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64 reqcnt = 0
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65
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66 # search through remote branches
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67 # a 'branch' here is a linear segment of history, with four parts:
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68 # head, root, first parent, second parent
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69 # (a branch always has two parents (or none) by definition)
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70 unknown = remote.branches(unknown)
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71 while unknown:
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72 r = []
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73 while unknown:
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74 n = unknown.pop(0)
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75 if n[0] in seen:
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76 continue
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77
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78 repo.ui.debug("examining %s:%s\n"
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79 % (short(n[0]), short(n[1])))
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80 if n[0] == nullid: # found the end of the branch
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81 pass
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82 elif n in seenbranch:
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83 repo.ui.debug("branch already found\n")
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84 continue
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85 elif n[1] and n[1] in m: # do we know the base?
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86 repo.ui.debug("found incomplete branch %s:%s\n"
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87 % (short(n[0]), short(n[1])))
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88 search.append(n[0:2]) # schedule branch range for scanning
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89 seenbranch.add(n)
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90 else:
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91 if n[1] not in seen and n[1] not in fetch:
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92 if n[2] in m and n[3] in m:
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93 repo.ui.debug("found new changeset %s\n" %
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94 short(n[1]))
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95 fetch.add(n[1]) # earliest unknown
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96 for p in n[2:4]:
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97 if p in m:
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98 base.add(p) # latest known
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99
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100 for p in n[2:4]:
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101 if p not in req and p not in m:
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102 r.append(p)
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103 req.add(p)
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104 seen.add(n[0])
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105
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106 if r:
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107 reqcnt += 1
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108 repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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109 repo.ui.debug("request %d: %s\n" %
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110 (reqcnt, " ".join(map(short, r))))
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111 for p in xrange(0, len(r), 10):
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112 for b in remote.branches(r[p:p + 10]):
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113 repo.ui.debug("received %s:%s\n" %
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114 (short(b[0]), short(b[1])))
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115 unknown.append(b)
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116
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117 # do binary search on the branches we found
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118 while search:
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119 newsearch = []
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120 reqcnt += 1
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121 repo.ui.progress(_('searching'), reqcnt, unit=_('queries'))
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122 for n, l in zip(search, remote.between(search)):
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123 l.append(n[1])
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124 p = n[0]
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125 f = 1
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126 for i in l:
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127 repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i)))
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128 if i in m:
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129 if f <= 2:
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130 repo.ui.debug("found new branch changeset %s\n" %
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131 short(p))
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132 fetch.add(p)
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133 base.add(i)
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134 else:
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135 repo.ui.debug("narrowed branch search to %s:%s\n"
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136 % (short(p), short(i)))
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137 newsearch.append((p, i))
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138 break
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139 p, f = i, f * 2
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140 search = newsearch
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141
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142 # sanity check our fetch list
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143 for f in fetch:
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144 if f in m:
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145 raise error.RepoError(_("already have changeset ")
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146 + short(f[:4]))
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147
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148 base = list(base)
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149 if base == [nullid]:
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150 if force:
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151 repo.ui.warn(_("warning: repository is unrelated\n"))
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152 else:
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153 raise util.Abort(_("repository is unrelated"))
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154
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155 repo.ui.debug("found new changesets starting at " +
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156 " ".join([short(f) for f in fetch]) + "\n")
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157
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158 repo.ui.progress(_('searching'), None)
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159 repo.ui.debug("%d total queries\n" % reqcnt)
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160
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161 return base, list(fetch), heads
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162
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163 def prepush(repo, remote, force, revs, newbranch):
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164 '''Analyze the local and remote repositories and determine which
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165 changesets need to be pushed to the remote. Return value depends
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166 on circumstances:
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167
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168 If we are not going to push anything, return a tuple (None,
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169 outgoing) where outgoing is 0 if there are no outgoing
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170 changesets and 1 if there are, but we refuse to push them
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171 (e.g. would create new remote heads).
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172
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173 Otherwise, return a tuple (changegroup, remoteheads), where
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174 changegroup is a readable file-like object whose read() returns
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175 successive changegroup chunks ready to be sent over the wire and
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176 remoteheads is the list of remote heads.'''
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177 remoteheads = remote.heads()
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178 common, inc, _rheads = findcommonincoming(repo, remote, heads=remoteheads,
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179 force=force)
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180
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181 cl = repo.changelog
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182 outg = cl.findmissing(common, revs)
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183
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184 if not outg:
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185 repo.ui.status(_("no changes found\n"))
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186 return None, 1
622
e9fe5d5e67f7 Add generic repo commands for pull and push
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187
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188 if not force and remoteheads != [nullid]:
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189 if remote.capable('branchmap'):
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190 # Check for each named branch if we're creating new remote heads.
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191 # To be a remote head after push, node must be either:
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192 # - unknown locally
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193 # - a local outgoing head descended from update
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194 # - a remote head that's known locally and not
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195 # ancestral to an outgoing head
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196
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197 # 1. Create set of branches involved in the push.
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198 branches = set(repo[n].branch() for n in outg)
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parents: 1464
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199
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200 # 2. Check for new branches on the remote.
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201 remotemap = remote.branchmap()
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202 newbranches = branches - set(remotemap)
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203 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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204 branchnames = ', '.join(sorted(newbranches))
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205 raise util.Abort(_("push creates new remote branches: %s!")
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206 % branchnames,
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207 hint=_("use 'hg push --new-branch' to create"
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208 " new remote branches"))
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209 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
210
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211 # 3. Construct the initial oldmap and newmap dicts.
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212 # They contain information about the remote heads before and
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213 # after the push, respectively.
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214 # Heads not found locally are not included in either dict,
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215 # since they won't be affected by the push.
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216 # unsynced contains all branches with incoming changesets.
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217 oldmap = {}
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218 newmap = {}
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219 unsynced = set()
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220 for branch in branches:
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221 remotebrheads = remotemap[branch]
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222 prunedbrheads = [h for h in remotebrheads if h in cl.nodemap]
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223 oldmap[branch] = prunedbrheads
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224 newmap[branch] = list(prunedbrheads)
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225 if len(remotebrheads) > len(prunedbrheads):
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226 unsynced.add(branch)
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85e2209d401c Protocol switch from using generators to stream-like objects.
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diff changeset
227
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228 # 4. Update newmap with outgoing changes.
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229 # This will possibly add new heads and remove existing ones.
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230 ctxgen = (repo[n] for n in outg)
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231 repo._updatebranchcache(newmap, ctxgen)
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65cc17ae9649 fix race in localrepo.addchangegroup.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents: 1995
diff changeset
232
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233 else:
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234 # 1-4b. old servers: Check for new topological heads.
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235 # Construct {old,new}map with branch = None (topological branch).
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236 # (code based on _updatebranchcache)
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237 oldheads = set(h for h in remoteheads if h in cl.nodemap)
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238 newheads = oldheads.union(outg)
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239 if len(newheads) > 1:
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240 for latest in reversed(outg):
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241 if latest not in newheads:
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242 continue
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243 minhrev = min(cl.rev(h) for h in newheads)
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244 reachable = cl.reachable(latest, cl.node(minhrev))
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245 reachable.remove(latest)
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246 newheads.difference_update(reachable)
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247 branches = set([None])
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248 newmap = {None: newheads}
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249 oldmap = {None: oldheads}
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250 unsynced = inc and branches or set()
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251
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252 # 5. Check for new heads.
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253 # If there are more heads after the push than before, a suitable
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254 # error message, depending on unsynced status, is displayed.
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255 error = None
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256 for branch in branches:
12998
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
257 newhs = set(newmap[branch])
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
258 oldhs = set(oldmap[branch])
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
259 if len(newhs) > len(oldhs):
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
260 if error is None:
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
261 if branch:
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
262 error = _("push creates new remote heads "
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
263 "on branch '%s'!") % branch
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
264 else:
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
265 error = _("push creates new remote heads!")
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
266 if branch in unsynced:
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
267 hint = _("you should pull and merge or "
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
268 "use push -f to force")
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
269 else:
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
270 hint = _("did you forget to merge? "
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
271 "use push -f to force")
11578
bb7af1de5e38 discovery: remove duplication for new remote head discovery
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 11577
diff changeset
272 if branch:
12998
91cb08a9e7fb discovery: list new remote heads in prepush() on --debug
Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
273 repo.ui.debug("new remote heads on branch '%s'\n" % branch)
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
274 for h in (newhs - oldhs):
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
275 repo.ui.debug("new remote head %s\n" % short(h))
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Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
276 if error:
91cb08a9e7fb discovery: list new remote heads in prepush() on --debug
Adrian Buehlmann <adrian@cadifra.com>
parents: 12997
diff changeset
277 raise util.Abort(error, hint=hint)
11578
bb7af1de5e38 discovery: remove duplication for new remote head discovery
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 11577
diff changeset
278
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 11577
diff changeset
279 # 6. Check for unsynced changes on involved branches.
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 11577
diff changeset
280 if unsynced:
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 11577
diff changeset
281 repo.ui.warn(_("note: unsynced remote changes!\n"))
515
03f27b1381f9 Whitespace cleanups
mpm@selenic.com
parents: 514
diff changeset
282
11301
3d0591a66118 move discovery methods from localrepo into new discovery module
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 11230
diff changeset
283 if revs is None:
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Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 11230
diff changeset
284 # use the fast path, no race possible on push
14073
72c84f24b420 discovery: drop findoutgoing and simplify findcommonincoming's api
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 13742
diff changeset
285 cg = repo._changegroup(outg, 'push')
11301
3d0591a66118 move discovery methods from localrepo into new discovery module
Dirkjan Ochtman <dirkjan@ochtman.nl>
parents: 11230
diff changeset
286 else:
14073
72c84f24b420 discovery: drop findoutgoing and simplify findcommonincoming's api
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents: 13742
diff changeset
287 cg = repo.getbundle('push', heads=revs, common=common)
11577
0bc450253312 discovery: better coding style
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents: 11576
diff changeset
288 return cg, remoteheads