Mercurial > hg
annotate mercurial/discovery.py @ 14353:afb2ed5b37a2 stable
revset: expand help for contains predicate
author | Martin Geisler <mg@aragost.com> |
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date | Wed, 18 May 2011 09:15:18 +0200 |
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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, 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, missing roots, heads) used to identify |
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14 missing nodes from remote. |
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15 |
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16 If a list of heads is specified, return only nodes which are heads |
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17 or ancestors of these heads. |
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18 """ |
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19 m = repo.changelog.nodemap |
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20 search = [] |
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21 fetch = set() |
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22 seen = set() |
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23 seenbranch = set() |
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24 base = set() |
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25 |
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26 if not heads: |
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27 heads = remote.heads() |
343 | 28 |
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29 if repo.changelog.tip() == nullid: |
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30 base.add(nullid) |
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31 if heads != [nullid]: |
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32 return [nullid], [nullid], list(heads) |
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33 return [nullid], [], [] |
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34 |
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35 # assume we're closer to the tip than the root |
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36 # and start by examining the heads |
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37 repo.ui.status(_("searching for changes\n")) |
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38 |
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39 unknown = [] |
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40 for h in heads: |
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41 if h not in m: |
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42 unknown.append(h) |
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43 else: |
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44 base.add(h) |
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45 |
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46 heads = unknown |
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47 if not unknown: |
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48 return list(base), [], [] |
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49 |
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50 req = set(unknown) |
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51 reqcnt = 0 |
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52 |
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53 # search through remote branches |
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54 # a 'branch' here is a linear segment of history, with four parts: |
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55 # head, root, first parent, second parent |
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56 # (a branch always has two parents (or none) by definition) |
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57 unknown = remote.branches(unknown) |
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58 while unknown: |
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59 r = [] |
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60 while unknown: |
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61 n = unknown.pop(0) |
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62 if n[0] in seen: |
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63 continue |
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64 |
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65 repo.ui.debug("examining %s:%s\n" |
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66 % (short(n[0]), short(n[1]))) |
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67 if n[0] == nullid: # found the end of the branch |
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68 pass |
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69 elif n in seenbranch: |
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70 repo.ui.debug("branch already found\n") |
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71 continue |
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72 elif n[1] and n[1] in m: # do we know the base? |
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73 repo.ui.debug("found incomplete branch %s:%s\n" |
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74 % (short(n[0]), short(n[1]))) |
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75 search.append(n[0:2]) # schedule branch range for scanning |
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76 seenbranch.add(n) |
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77 else: |
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78 if n[1] not in seen and n[1] not in fetch: |
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79 if n[2] in m and n[3] in m: |
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80 repo.ui.debug("found new changeset %s\n" % |
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81 short(n[1])) |
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82 fetch.add(n[1]) # earliest unknown |
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83 for p in n[2:4]: |
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84 if p in m: |
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85 base.add(p) # latest known |
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86 |
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87 for p in n[2:4]: |
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88 if p not in req and p not in m: |
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89 r.append(p) |
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90 req.add(p) |
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91 seen.add(n[0]) |
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92 |
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93 if r: |
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94 reqcnt += 1 |
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95 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) |
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96 repo.ui.debug("request %d: %s\n" % |
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97 (reqcnt, " ".join(map(short, r)))) |
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98 for p in xrange(0, len(r), 10): |
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99 for b in remote.branches(r[p:p + 10]): |
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100 repo.ui.debug("received %s:%s\n" % |
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101 (short(b[0]), short(b[1]))) |
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102 unknown.append(b) |
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103 |
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104 # do binary search on the branches we found |
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105 while search: |
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106 newsearch = [] |
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107 reqcnt += 1 |
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108 repo.ui.progress(_('searching'), reqcnt, unit=_('queries')) |
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109 for n, l in zip(search, remote.between(search)): |
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110 l.append(n[1]) |
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111 p = n[0] |
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112 f = 1 |
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113 for i in l: |
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114 repo.ui.debug("narrowing %d:%d %s\n" % (f, len(l), short(i))) |
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115 if i in m: |
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116 if f <= 2: |
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117 repo.ui.debug("found new branch changeset %s\n" % |
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118 short(p)) |
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119 fetch.add(p) |
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120 base.add(i) |
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121 else: |
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122 repo.ui.debug("narrowed branch search to %s:%s\n" |
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123 % (short(p), short(i))) |
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124 newsearch.append((p, i)) |
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125 break |
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126 p, f = i, f * 2 |
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127 search = newsearch |
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128 |
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129 # sanity check our fetch list |
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130 for f in fetch: |
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131 if f in m: |
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132 raise error.RepoError(_("already have changeset ") |
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133 + short(f[:4])) |
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134 |
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135 base = list(base) |
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136 if base == [nullid]: |
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137 if force: |
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138 repo.ui.warn(_("warning: repository is unrelated\n")) |
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139 else: |
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140 raise util.Abort(_("repository is unrelated")) |
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141 |
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142 repo.ui.debug("found new changesets starting at " + |
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143 " ".join([short(f) for f in fetch]) + "\n") |
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144 |
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145 repo.ui.progress(_('searching'), None) |
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146 repo.ui.debug("%d total queries\n" % reqcnt) |
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147 |
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148 return base, list(fetch), heads |
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149 |
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150 def findoutgoing(repo, remote, base=None, remoteheads=None, force=False): |
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151 """Return list of nodes that are roots of subsets not in remote |
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152 |
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153 If base dict is specified, assume that these nodes and their parents |
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154 exist on the remote side. |
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155 If remotehead is specified, assume it is the list of the heads from |
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156 the remote repository. |
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157 """ |
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158 if base is None: |
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159 base = findcommonincoming(repo, remote, heads=remoteheads, |
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160 force=force)[0] |
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161 else: |
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162 base = list(base) |
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163 |
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164 repo.ui.debug("common changesets up to " |
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165 + " ".join(map(short, base)) + "\n") |
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166 |
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167 remain = set(repo.changelog.nodemap) |
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168 |
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169 # prune everything remote has from the tree |
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170 remain.remove(nullid) |
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171 remove = base |
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172 while remove: |
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173 n = remove.pop(0) |
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174 if n in remain: |
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175 remain.remove(n) |
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176 for p in repo.changelog.parents(n): |
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177 remove.append(p) |
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178 |
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179 # find every node whose parents have been pruned |
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180 subset = [] |
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181 # find every remote head that will get new children |
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182 for n in remain: |
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183 p1, p2 = repo.changelog.parents(n) |
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184 if p1 not in remain and p2 not in remain: |
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185 subset.append(n) |
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186 |
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187 return subset |
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188 |
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189 def prepush(repo, remote, force, revs, newbranch): |
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190 '''Analyze the local and remote repositories and determine which |
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191 changesets need to be pushed to the remote. Return value depends |
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192 on circumstances: |
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193 |
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194 If we are not going to push anything, return a tuple (None, |
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195 outgoing) where outgoing is 0 if there are no outgoing |
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196 changesets and 1 if there are, but we refuse to push them |
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197 (e.g. would create new remote heads). |
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198 |
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199 Otherwise, return a tuple (changegroup, remoteheads), where |
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200 changegroup is a readable file-like object whose read() returns |
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201 successive changegroup chunks ready to be sent over the wire and |
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202 remoteheads is the list of remote heads.''' |
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203 remoteheads = remote.heads() |
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204 common, inc, rheads = findcommonincoming(repo, remote, heads=remoteheads, |
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205 force=force) |
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206 |
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207 cl = repo.changelog |
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208 update = findoutgoing(repo, remote, common, remoteheads) |
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209 outg, bases, heads = cl.nodesbetween(update, revs) |
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210 |
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211 if not bases: |
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212 repo.ui.status(_("no changes found\n")) |
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213 return None, 1 |
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214 |
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215 if not force and remoteheads != [nullid]: |
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216 if remote.capable('branchmap'): |
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217 # Check for each named branch if we're creating new remote heads. |
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218 # To be a remote head after push, node must be either: |
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219 # - unknown locally |
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220 # - a local outgoing head descended from update |
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221 # - a remote head that's known locally and not |
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222 # ancestral to an outgoing head |
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223 |
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224 # 1. Create set of branches involved in the push. |
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225 branches = set(repo[n].branch() for n in outg) |
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226 |
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227 # 2. Check for new branches on the remote. |
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228 remotemap = remote.branchmap() |
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229 newbranches = branches - set(remotemap) |
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230 if newbranches and not newbranch: # new branch requires --new-branch |
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231 branchnames = ', '.join(sorted(newbranches)) |
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232 raise util.Abort(_("push creates new remote branches: %s!") |
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233 % branchnames, |
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234 hint=_("use 'hg push --new-branch' to create" |
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235 " new remote branches")) |
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236 branches.difference_update(newbranches) |
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237 |
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238 # 3. Construct the initial oldmap and newmap dicts. |
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239 # They contain information about the remote heads before and |
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240 # after the push, respectively. |
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241 # Heads not found locally are not included in either dict, |
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242 # since they won't be affected by the push. |
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243 # unsynced contains all branches with incoming changesets. |
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244 oldmap = {} |
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245 newmap = {} |
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246 unsynced = set() |
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247 for branch in branches: |
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248 remotebrheads = remotemap[branch] |
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249 prunedbrheads = [h for h in remotebrheads if h in cl.nodemap] |
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250 oldmap[branch] = prunedbrheads |
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251 newmap[branch] = list(prunedbrheads) |
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252 if len(remotebrheads) > len(prunedbrheads): |
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253 unsynced.add(branch) |
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254 |
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255 # 4. Update newmap with outgoing changes. |
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256 # This will possibly add new heads and remove existing ones. |
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257 ctxgen = (repo[n] for n in outg) |
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258 repo._updatebranchcache(newmap, ctxgen) |
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259 |
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260 else: |
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261 # 1-4b. old servers: Check for new topological heads. |
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262 # Construct {old,new}map with branch = None (topological branch). |
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263 # (code based on _updatebranchcache) |
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264 oldheads = set(h for h in remoteheads if h in cl.nodemap) |
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265 newheads = oldheads.union(outg) |
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266 if len(newheads) > 1: |
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267 for latest in reversed(outg): |
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268 if latest not in newheads: |
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269 continue |
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270 minhrev = min(cl.rev(h) for h in newheads) |
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271 reachable = cl.reachable(latest, cl.node(minhrev)) |
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272 reachable.remove(latest) |
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273 newheads.difference_update(reachable) |
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274 branches = set([None]) |
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275 newmap = {None: newheads} |
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276 oldmap = {None: oldheads} |
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277 unsynced = inc and branches or set() |
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278 |
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279 # 5. Check for new heads. |
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280 # If there are more heads after the push than before, a suitable |
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281 # error message, depending on unsynced status, is displayed. |
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282 error = None |
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283 for branch in branches: |
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284 newhs = set(newmap[branch]) |
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285 oldhs = set(oldmap[branch]) |
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286 if len(newhs) > len(oldhs): |
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287 if error is None: |
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288 if branch: |
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289 error = _("push creates new remote heads " |
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290 "on branch '%s'!") % branch |
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291 else: |
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292 error = _("push creates new remote heads!") |
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293 if branch in unsynced: |
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294 hint = _("you should pull and merge or " |
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295 "use push -f to force") |
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296 else: |
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297 hint = _("did you forget to merge? " |
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298 "use push -f to force") |
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299 if branch: |
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300 repo.ui.debug("new remote heads on branch '%s'\n" % branch) |
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301 for h in (newhs - oldhs): |
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302 repo.ui.debug("new remote head %s\n" % short(h)) |
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303 if error: |
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304 raise util.Abort(error, hint=hint) |
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305 |
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306 # 6. Check for unsynced changes on involved branches. |
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307 if unsynced: |
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308 repo.ui.warn(_("note: unsynced remote changes!\n")) |
515 | 309 |
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310 if revs is None: |
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311 # use the fast path, no race possible on push |
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312 nodes = repo.changelog.findmissing(common) |
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313 cg = repo._changegroup(nodes, 'push') |
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314 else: |
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315 cg = repo.changegroupsubset(update, revs, 'push') |
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316 return cg, remoteheads |