Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/merge.py @ 3470:2ed139c3b328
hgweb: add revision numbers to changeset parent/child links
author | Brendan Cully <brendan@kublai.com> |
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date | Thu, 19 Oct 2006 15:58:43 -0700 |
parents | 798bcde0c9c2 |
children | 3b4e00cba57a |
rev | line source |
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1 # merge.py - directory-level update/merge handling for Mercurial |
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2 # |
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3 # Copyright 2006 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 |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
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8 from node import * |
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9 from i18n import gettext as _ |
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10 from demandload import * |
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11 demandload(globals(), "errno util os tempfile") |
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12 |
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13 def filemerge(repo, fw, fo, wctx, mctx): |
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14 """perform a 3-way merge in the working directory |
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15 |
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16 fw = filename in the working directory |
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17 fo = filename in other parent |
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18 wctx, mctx = working and merge changecontexts |
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19 """ |
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20 |
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21 def temp(prefix, ctx): |
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22 pre = "%s~%s." % (os.path.basename(ctx.path()), prefix) |
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23 (fd, name) = tempfile.mkstemp(prefix=pre) |
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24 f = os.fdopen(fd, "wb") |
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25 repo.wwrite(ctx.path(), ctx.data(), f) |
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26 f.close() |
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27 return name |
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28 |
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29 fcm = wctx.filectx(fw) |
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30 fco = mctx.filectx(fo) |
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31 |
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32 if not fco.cmp(fcm.data()): # files identical? |
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33 return None |
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34 |
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35 fca = fcm.ancestor(fco) |
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36 if not fca: |
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37 fca = repo.filectx(fw, fileid=-1) |
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38 a = repo.wjoin(fw) |
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39 b = temp("base", fca) |
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40 c = temp("other", fco) |
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41 |
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42 if fw != fo: |
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43 repo.ui.status(_("merging %s and %s\n") % (fw, fo)) |
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44 else: |
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45 repo.ui.status(_("merging %s\n") % fw) |
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46 |
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47 repo.ui.debug(_("my %s other %s ancestor %s\n") % (fcm, fco, fca)) |
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48 |
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49 cmd = (os.environ.get("HGMERGE") or repo.ui.config("ui", "merge") |
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50 or "hgmerge") |
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51 r = util.system('%s "%s" "%s" "%s"' % (cmd, a, b, c), cwd=repo.root, |
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52 environ={'HG_FILE': fw, |
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53 'HG_MY_NODE': str(wctx.parents()[0]), |
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54 'HG_OTHER_NODE': str(mctx)}) |
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55 if r: |
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56 repo.ui.warn(_("merging %s failed!\n") % fw) |
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57 |
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58 os.unlink(b) |
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59 os.unlink(c) |
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60 return r |
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61 |
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62 def checkunknown(wctx, mctx): |
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63 "check for collisions between unknown files and files in mctx" |
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64 man = mctx.manifest() |
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65 for f in wctx.unknown(): |
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66 if f in man: |
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67 if mctx.filectx(f).cmp(wctx.filectx(f).data()): |
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68 raise util.Abort(_("'%s' already exists in the working" |
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69 " dir and differs from remote") % f) |
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70 |
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71 def forgetremoved(wctx, mctx): |
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72 """ |
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73 Forget removed files |
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74 |
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75 If we're jumping between revisions (as opposed to merging), and if |
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76 neither the working directory nor the target rev has the file, |
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77 then we need to remove it from the dirstate, to prevent the |
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78 dirstate from listing the file when it is no longer in the |
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79 manifest. |
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80 """ |
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81 |
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82 action = [] |
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83 man = mctx.manifest() |
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84 for f in wctx.deleted() + wctx.removed(): |
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85 if f not in man: |
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86 action.append((f, "f")) |
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87 |
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88 return action |
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89 |
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90 def nonoverlap(d1, d2, d3): |
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91 "Return list of elements in d1 not in d2 or d3" |
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92 |
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93 l = [] |
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94 for d in d1: |
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95 if d not in d3 and d not in d2: |
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96 l.append(d) |
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97 |
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98 l.sort() |
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99 return l |
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100 |
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101 def findold(fctx, limit): |
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102 "find files that path was copied from, back to linkrev limit" |
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103 |
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104 old = {} |
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105 orig = fctx.path() |
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106 visit = [fctx] |
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107 while visit: |
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108 fc = visit.pop() |
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109 if fc.rev() < limit: |
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110 continue |
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111 if fc.path() != orig and fc.path() not in old: |
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112 old[fc.path()] = 1 |
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113 visit += fc.parents() |
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114 |
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115 old = old.keys() |
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116 old.sort() |
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117 return old |
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118 |
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119 def findcopies(repo, m1, m2, ma, limit): |
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120 """ |
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121 Find moves and copies between m1 and m2 back to limit linkrev |
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122 """ |
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123 |
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124 if not repo.ui.configbool("merge", "followcopies", True): |
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125 return {} |
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126 |
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127 # avoid silly behavior for update from empty dir |
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128 if not m1: |
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129 return {} |
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130 |
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131 dcopies = repo.dirstate.copies() |
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132 copy = {} |
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133 match = {} |
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134 u1 = nonoverlap(m1, m2, ma) |
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135 u2 = nonoverlap(m2, m1, ma) |
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136 ctx = util.cachefunc(lambda f,n: repo.filectx(f, fileid=n[:20])) |
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137 |
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138 def checkpair(c, f2, man): |
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139 ''' check if an apparent pair actually matches ''' |
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140 c2 = ctx(f2, man[f2]) |
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141 ca = c.ancestor(c2) |
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142 if ca and ca.path() == c.path() or ca.path() == c2.path(): |
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143 copy[c.path()] = f2 |
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144 copy[f2] = c.path() |
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145 |
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146 for f in u1: |
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147 c = ctx(dcopies.get(f, f), m1[f]) |
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148 for of in findold(c, limit): |
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149 if of in m2: |
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150 checkpair(c, of, m2) |
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151 else: |
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152 match.setdefault(of, []).append(f) |
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153 |
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154 for f in u2: |
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155 c = ctx(f, m2[f]) |
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156 for of in findold(c, limit): |
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157 if of in m1: |
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158 checkpair(c, of, m1) |
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159 elif of in match: |
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160 for mf in match[of]: |
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161 checkpair(c, mf, m1) |
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162 |
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163 return copy |
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164 |
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165 def manifestmerge(repo, p1, p2, pa, overwrite, partial): |
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166 """ |
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167 Merge p1 and p2 with ancestor ma and generate merge action list |
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168 |
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169 overwrite = whether we clobber working files |
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170 partial = function to filter file lists |
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171 """ |
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172 |
3320 | 173 repo.ui.note(_("resolving manifests\n")) |
174 repo.ui.debug(_(" overwrite %s partial %s\n") % (overwrite, bool(partial))) | |
175 repo.ui.debug(_(" ancestor %s local %s remote %s\n") % (pa, p1, p2)) | |
176 | |
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177 m1 = p1.manifest() |
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178 m2 = p2.manifest() |
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179 ma = pa.manifest() |
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180 backwards = (pa == p2) |
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182 copy = {} | |
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183 |
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184 def fmerge(f, f2=None, fa=None): |
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185 """merge executable flags""" |
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186 if not f2: |
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187 f2 = f |
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188 fa = f |
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189 a, b, c = ma.execf(fa), m1.execf(f), m2.execf(f2) |
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190 return ((a^b) | (a^c)) ^ a |
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191 |
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192 def act(msg, m, f, *args): |
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193 repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m)) |
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194 action.append((f, m) + args) |
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195 |
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196 if not (backwards or overwrite): |
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197 copy = findcopies(repo, m1, m2, ma, pa.rev()) |
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198 |
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199 # Compare manifests |
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200 for f, n in m1.iteritems(): |
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201 if partial and not partial(f): |
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202 continue |
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203 if f in m2: |
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204 # are files different? |
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205 if n != m2[f]: |
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206 a = ma.get(f, nullid) |
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207 # are both different from the ancestor? |
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208 if not overwrite and n != a and m2[f] != a: |
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209 act("versions differ", "m", f, f, f, fmerge(f), False) |
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210 # are we clobbering? |
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211 # is remote's version newer? |
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212 # or are we going back in time and clean? |
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213 elif overwrite or m2[f] != a or (backwards and not n[20:]): |
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214 act("remote is newer", "g", f, m2.execf(f)) |
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215 # local is newer, not overwrite, check mode bits |
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216 elif fmerge(f) != m1.execf(f): |
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217 act("update permissions", "e", f, m2.execf(f)) |
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218 # contents same, check mode bits |
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219 elif m1.execf(f) != m2.execf(f): |
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220 if overwrite or fmerge(f) != m1.execf(f): |
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221 act("update permissions", "e", f, m2.execf(f)) |
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222 elif f in copy: |
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223 f2 = copy[f] |
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224 if f in ma: # case 3,20 A/B/A |
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225 act("remote moved", "m", f, f2, f2, fmerge(f, f2, f), True) |
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226 else: |
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227 if f2 in m1: # case 2 A,B/B/B |
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228 act("local copied", "m", |
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229 f, f2, f, fmerge(f, f2, f2), False) |
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230 else: # case 4,21 A/B/B |
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231 act("local moved", "m", |
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232 f, f2, f, fmerge(f, f2, f2), False) |
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233 elif f in ma: |
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234 if n != ma[f] and not overwrite: |
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235 if repo.ui.prompt( |
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236 (_(" local changed %s which remote deleted\n") % f) + |
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237 _("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("d"): |
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238 act("prompt delete", "r", f) |
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239 else: |
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240 act("other deleted", "r", f) |
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241 else: |
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242 # file is created on branch or in working directory |
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243 if (overwrite and n[20:] != "u") or (backwards and not n[20:]): |
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244 act("remote deleted", "r", f) |
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245 |
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246 for f, n in m2.iteritems(): |
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247 if partial and not partial(f): |
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248 continue |
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249 if f in m1: |
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250 continue |
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251 if f in copy: |
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252 f2 = copy[f] |
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253 if f2 not in m2: # already seen |
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254 continue |
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255 # rename case 1, A/A,B/A |
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256 act("remote copied", "m", f2, f, f, fmerge(f2, f, f2), False) |
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257 elif f in ma: |
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258 if overwrite or backwards: |
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259 act("recreating", "g", f, m2.execf(f)) |
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260 elif n != ma[f]: |
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261 if repo.ui.prompt( |
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262 (_("remote changed %s which local deleted\n") % f) + |
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263 _("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("k"): |
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264 act("prompt recreating", "g", f, m2.execf(f)) |
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265 else: |
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266 act("remote created", "g", f, m2.execf(f)) |
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267 |
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268 return action |
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269 |
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270 def applyupdates(repo, action, wctx, mctx): |
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271 "apply the merge action list to the working directory" |
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272 |
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273 updated, merged, removed, unresolved = 0, 0, 0, 0 |
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274 action.sort() |
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275 for a in action: |
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276 f, m = a[:2] |
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277 if f[0] == "/": |
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278 continue |
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279 if m == "r": # remove |
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280 repo.ui.note(_("removing %s\n") % f) |
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281 util.audit_path(f) |
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282 try: |
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283 util.unlink(repo.wjoin(f)) |
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284 except OSError, inst: |
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285 if inst.errno != errno.ENOENT: |
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286 repo.ui.warn(_("update failed to remove %s: %s!\n") % |
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287 (f, inst.strerror)) |
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288 removed +=1 |
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289 elif m == "m": # merge |
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290 f2, fd, flag, move = a[2:] |
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291 r = filemerge(repo, f, f2, wctx, mctx) |
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292 if r > 0: |
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293 unresolved += 1 |
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294 else: |
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295 if r is None: |
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296 updated += 1 |
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297 else: |
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298 merged += 1 |
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299 if f != fd: |
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300 repo.ui.debug(_("copying %s to %s\n") % (f, fd)) |
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301 repo.wwrite(fd, repo.wread(f)) |
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302 if move: |
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303 repo.ui.debug(_("removing %s\n") % f) |
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304 os.unlink(repo.wjoin(f)) |
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305 util.set_exec(repo.wjoin(fd), flag) |
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306 elif m == "g": # get |
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307 flag = a[2] |
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308 repo.ui.note(_("getting %s\n") % f) |
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309 t = mctx.filectx(f).data() |
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310 repo.wwrite(f, t) |
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311 util.set_exec(repo.wjoin(f), flag) |
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312 updated += 1 |
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313 elif m == "e": # exec |
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314 flag = a[2] |
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315 util.set_exec(repo.wjoin(f), flag) |
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316 |
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317 return updated, merged, removed, unresolved |
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318 |
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319 def recordupdates(repo, action, branchmerge): |
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320 "record merge actions to the dirstate" |
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321 |
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322 for a in action: |
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323 f, m = a[:2] |
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324 if m == "r": # remove |
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325 if branchmerge: |
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326 repo.dirstate.update([f], 'r') |
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327 else: |
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328 repo.dirstate.forget([f]) |
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329 elif m == "f": # forget |
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330 repo.dirstate.forget([f]) |
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331 elif m == "g": # get |
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332 if branchmerge: |
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333 repo.dirstate.update([f], 'n', st_mtime=-1) |
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334 else: |
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335 repo.dirstate.update([f], 'n') |
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336 elif m == "m": # merge |
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337 f2, fd, flag, move = a[2:] |
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338 if branchmerge: |
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339 # We've done a branch merge, mark this file as merged |
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340 # so that we properly record the merger later |
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341 repo.dirstate.update([fd], 'm') |
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342 if f != f2: # copy/rename |
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343 if move: |
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344 repo.dirstate.update([f], 'r') |
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345 if f != fd: |
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346 repo.dirstate.copy(f, fd) |
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347 else: |
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348 repo.dirstate.copy(f2, fd) |
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349 else: |
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350 # We've update-merged a locally modified file, so |
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351 # we set the dirstate to emulate a normal checkout |
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352 # of that file some time in the past. Thus our |
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353 # merge will appear as a normal local file |
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354 # modification. |
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355 repo.dirstate.update([fd], 'n', st_size=-1, st_mtime=-1) |
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356 if move: |
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357 repo.dirstate.forget([f]) |
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358 |
3323
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359 def update(repo, node, branchmerge, force, partial, wlock): |
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360 """ |
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361 Perform a merge between the working directory and the given node |
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362 |
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363 branchmerge = whether to merge between branches |
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364 force = whether to force branch merging or file overwriting |
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365 partial = a function to filter file lists (dirstate not updated) |
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366 wlock = working dir lock, if already held |
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367 """ |
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368 |
2826
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369 if not wlock: |
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370 wlock = repo.wlock() |
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371 |
3320 | 372 overwrite = force and not branchmerge |
373 forcemerge = force and branchmerge | |
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374 wc = repo.workingctx() |
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375 pl = wc.parents() |
3320 | 376 p1, p2 = pl[0], repo.changectx(node) |
377 pa = p1.ancestor(p2) | |
378 fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2) | |
379 | |
380 ### check phase | |
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381 if not overwrite and len(pl) > 1: |
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382 raise util.Abort(_("outstanding uncommitted merges")) |
3320 | 383 if pa == p1 or pa == p2: # is there a linear path from p1 to p2? |
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384 if branchmerge: |
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385 raise util.Abort(_("there is nothing to merge, just use " |
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386 "'hg update' or look at 'hg heads'")) |
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387 elif not (overwrite or branchmerge): |
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388 raise util.Abort(_("update spans branches, use 'hg merge' " |
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389 "or 'hg update -C' to lose changes")) |
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390 if branchmerge and not forcemerge: |
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391 if wc.modified() or wc.added() or wc.removed(): |
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392 raise util.Abort(_("outstanding uncommitted changes")) |
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393 |
3320 | 394 ### calculate phase |
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395 action = [] |
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396 if not force: |
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397 checkunknown(wc, p2) |
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398 if not branchmerge: |
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399 action += forgetremoved(wc, p2) |
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400 action += manifestmerge(repo, wc, p2, pa, overwrite, partial) |
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401 |
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402 ### apply phase |
3320 | 403 if not branchmerge: # just jump to the new rev |
404 fp1, fp2, xp1, xp2 = fp2, nullid, xp2, '' | |
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405 if not partial: |
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406 repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2) |
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407 |
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408 stats = applyupdates(repo, action, wc, p2) |
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409 |
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410 if not partial: |
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411 recordupdates(repo, action, branchmerge) |
3320 | 412 repo.dirstate.setparents(fp1, fp2) |
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413 repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3]) |
3441 | 414 if not branchmerge: |
3442 | 415 repo.opener("branch", "w").write(p2.branch() + "\n") |
3320 | 416 |
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417 return stats |
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418 |