Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/merge.py @ 3831:531c116b2028
Add doc notes about revert and hg status vs diff
author | Matt Mackall <mpm@selenic.com> |
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date | Fri, 08 Dec 2006 14:55:45 -0600 |
parents | 6398ff7cb705 |
children | 46abbed02b2d |
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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=nullrev) |
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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(_("untracked local file '%s' differs"\ |
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69 " from remote version") % f) |
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70 |
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72 "check for case folding collisions in the destination context" | |
73 folded = {} | |
74 for fn in mctx.manifest(): | |
75 fold = fn.lower() | |
76 if fold in folded: | |
77 raise util.Abort(_("case-folding collision between %s and %s") | |
78 % (fn, folded[fold])) | |
79 folded[fold] = fn | |
80 | |
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81 def forgetremoved(wctx, mctx): |
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82 """ |
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83 Forget removed files |
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84 |
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85 If we're jumping between revisions (as opposed to merging), and if |
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86 neither the working directory nor the target rev has the file, |
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87 then we need to remove it from the dirstate, to prevent the |
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88 dirstate from listing the file when it is no longer in the |
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89 manifest. |
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90 """ |
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91 |
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92 action = [] |
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93 man = mctx.manifest() |
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94 for f in wctx.deleted() + wctx.removed(): |
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95 if f not in man: |
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96 action.append((f, "f")) |
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97 |
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98 return action |
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99 |
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100 def findcopies(repo, m1, m2, ma, limit): |
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101 """ |
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102 Find moves and copies between m1 and m2 back to limit linkrev |
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103 """ |
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104 |
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105 def findold(fctx): |
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106 "find files that path was copied from, back to linkrev limit" |
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107 old = {} |
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108 orig = fctx.path() |
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109 visit = [fctx] |
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110 while visit: |
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111 fc = visit.pop() |
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112 if fc.rev() < limit: |
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113 continue |
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114 if fc.path() != orig and fc.path() not in old: |
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115 old[fc.path()] = 1 |
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116 visit += fc.parents() |
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117 |
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118 old = old.keys() |
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119 old.sort() |
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120 return old |
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121 |
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122 def nonoverlap(d1, d2, d3): |
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123 "Return list of elements in d1 not in d2 or d3" |
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124 l = [d for d in d1 if d not in d3 and d not in d2] |
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125 l.sort() |
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126 return l |
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127 |
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128 def checkcopies(c, man): |
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129 '''check possible copies for filectx c''' |
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130 for of in findold(c): |
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131 if of not in man: |
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132 return |
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133 c2 = ctx(of, man[of]) |
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134 ca = c.ancestor(c2) |
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135 if not ca: # unrelated |
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136 return |
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137 if ca.path() == c.path() or ca.path() == c2.path(): |
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138 fullcopy[c.path()] = of |
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139 if c == ca or c2 == ca: # no merge needed, ignore copy |
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140 return |
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141 copy[c.path()] = of |
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142 |
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143 def dirs(files): |
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144 d = {} |
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145 for f in files: |
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146 d[os.path.dirname(f)] = True |
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147 return d |
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148 |
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149 if not repo.ui.configbool("merge", "followcopies", True): |
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150 return {} |
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151 |
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152 # avoid silly behavior for update from empty dir |
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153 if not m1 or not m2 or not ma: |
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154 return {} |
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155 |
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156 dcopies = repo.dirstate.copies() |
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157 copy = {} |
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158 fullcopy = {} |
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159 u1 = nonoverlap(m1, m2, ma) |
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160 u2 = nonoverlap(m2, m1, ma) |
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161 ctx = util.cachefunc(lambda f, n: repo.filectx(f, fileid=n[:20])) |
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162 |
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163 for f in u1: |
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164 checkcopies(ctx(dcopies.get(f, f), m1[f]), m2) |
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165 |
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166 for f in u2: |
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167 checkcopies(ctx(f, m2[f]), m1) |
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168 |
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169 if not fullcopy or not repo.ui.configbool("merge", "followdirs", True): |
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170 return copy |
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171 |
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172 # generate a directory move map |
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173 d1, d2 = dirs(m1), dirs(m2) |
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174 invalid = {} |
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175 dirmove = {} |
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176 |
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177 for dst, src in fullcopy.items(): |
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178 dsrc, ddst = os.path.dirname(src), os.path.dirname(dst) |
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179 if dsrc in invalid: |
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180 continue |
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181 elif (dsrc in d1 and ddst in d1) or (dsrc in d2 and ddst in d2): |
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182 invalid[dsrc] = True |
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183 elif dsrc in dirmove and dirmove[dsrc] != ddst: |
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184 invalid[dsrc] = True |
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185 del dirmove[dsrc] |
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186 else: |
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187 dirmove[dsrc] = ddst |
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188 |
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189 del d1, d2, invalid |
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190 |
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191 if not dirmove: |
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192 return copy |
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193 |
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194 # check unaccounted nonoverlapping files |
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195 for f in u1 + u2: |
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196 if f not in fullcopy: |
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197 d = os.path.dirname(f) |
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198 if d in dirmove: |
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199 copy[f] = dirmove[d] + "/" + os.path.basename(f) |
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200 |
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201 return copy |
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202 |
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203 def manifestmerge(repo, p1, p2, pa, overwrite, partial): |
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204 """ |
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205 Merge p1 and p2 with ancestor ma and generate merge action list |
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206 |
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207 overwrite = whether we clobber working files |
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208 partial = function to filter file lists |
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209 """ |
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210 |
3320 | 211 repo.ui.note(_("resolving manifests\n")) |
212 repo.ui.debug(_(" overwrite %s partial %s\n") % (overwrite, bool(partial))) | |
213 repo.ui.debug(_(" ancestor %s local %s remote %s\n") % (pa, p1, p2)) | |
214 | |
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215 m1 = p1.manifest() |
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216 m2 = p2.manifest() |
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217 ma = pa.manifest() |
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218 backwards = (pa == p2) |
3320 | 219 action = [] |
220 copy = {} | |
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221 |
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222 def fmerge(f, f2=None, fa=None): |
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223 """merge executable flags""" |
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224 if not f2: |
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225 f2 = f |
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226 fa = f |
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227 a, b, c = ma.execf(fa), m1.execf(f), m2.execf(f2) |
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228 return ((a^b) | (a^c)) ^ a |
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229 |
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230 def act(msg, m, f, *args): |
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231 repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m)) |
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232 action.append((f, m) + args) |
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233 |
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234 if not (backwards or overwrite): |
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235 copy = findcopies(repo, m1, m2, ma, pa.rev()) |
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236 copied = dict.fromkeys(copy.values()) |
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237 |
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238 # Compare manifests |
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239 for f, n in m1.iteritems(): |
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240 if partial and not partial(f): |
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241 continue |
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242 if f in m2: |
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243 # are files different? |
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244 if n != m2[f]: |
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245 a = ma.get(f, nullid) |
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246 # are both different from the ancestor? |
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247 if not overwrite and n != a and m2[f] != a: |
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248 act("versions differ", "m", f, f, f, fmerge(f), False) |
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249 # are we clobbering? |
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250 # is remote's version newer? |
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251 # or are we going back in time and clean? |
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252 elif overwrite or m2[f] != a or (backwards and not n[20:]): |
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253 act("remote is newer", "g", f, m2.execf(f)) |
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254 # local is newer, not overwrite, check mode bits |
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255 elif fmerge(f) != m1.execf(f): |
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256 act("update permissions", "e", f, m2.execf(f)) |
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257 # contents same, check mode bits |
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258 elif m1.execf(f) != m2.execf(f): |
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259 if overwrite or fmerge(f) != m1.execf(f): |
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260 act("update permissions", "e", f, m2.execf(f)) |
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261 elif f in copied: |
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262 continue |
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263 elif f in copy: |
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264 f2 = copy[f] |
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265 if f2 not in m2: # directory rename |
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266 act("remote renamed directory to " + f2, "d", |
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267 f, None, f2, m1.execf(f)) |
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268 elif f2 in m1: # case 2 A,B/B/B |
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269 act("local copied to " + f2, "m", |
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270 f, f2, f, fmerge(f, f2, f2), False) |
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271 else: # case 4,21 A/B/B |
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272 act("local moved to " + f2, "m", |
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273 f, f2, f, fmerge(f, f2, f2), False) |
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274 elif f in ma: |
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275 if n != ma[f] and not overwrite: |
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276 if repo.ui.prompt( |
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277 (_(" local changed %s which remote deleted\n") % f) + |
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278 _("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("d"): |
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279 act("prompt delete", "r", f) |
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280 else: |
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281 act("other deleted", "r", f) |
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282 else: |
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283 # file is created on branch or in working directory |
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284 if (overwrite and n[20:] != "u") or (backwards and not n[20:]): |
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285 act("remote deleted", "r", f) |
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286 |
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287 for f, n in m2.iteritems(): |
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288 if partial and not partial(f): |
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289 continue |
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290 if f in m1: |
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291 continue |
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292 if f in copied: |
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293 continue |
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294 if f in copy: |
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295 f2 = copy[f] |
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296 if f2 not in m1: # directory rename |
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297 act("local renamed directory to " + f2, "d", |
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298 None, f, f2, m2.execf(f)) |
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299 elif f2 in m2: # rename case 1, A/A,B/A |
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300 act("remote copied to " + f, "m", |
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301 f2, f, f, fmerge(f2, f, f2), False) |
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302 else: # case 3,20 A/B/A |
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303 act("remote moved to " + f, "m", |
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304 f2, f, f, fmerge(f2, f, f2), True) |
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305 elif f in ma: |
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306 if overwrite or backwards: |
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307 act("recreating", "g", f, m2.execf(f)) |
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308 elif n != ma[f]: |
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309 if repo.ui.prompt( |
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310 (_("remote changed %s which local deleted\n") % f) + |
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311 _("(k)eep or (d)elete?"), _("[kd]"), _("k")) == _("k"): |
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312 act("prompt recreating", "g", f, m2.execf(f)) |
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313 else: |
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314 act("remote created", "g", f, m2.execf(f)) |
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315 |
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316 return action |
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317 |
3303
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3302
diff
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318 def applyupdates(repo, action, wctx, mctx): |
3322
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319 "apply the merge action list to the working directory" |
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320 |
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321 updated, merged, removed, unresolved = 0, 0, 0, 0 |
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322 action.sort() |
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323 for a in action: |
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324 f, m = a[:2] |
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325 if f and f[0] == "/": |
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326 continue |
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327 if m == "r": # remove |
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328 repo.ui.note(_("removing %s\n") % f) |
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329 util.audit_path(f) |
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330 try: |
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|
331 util.unlink(repo.wjoin(f)) |
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332 except OSError, inst: |
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|
333 if inst.errno != errno.ENOENT: |
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334 repo.ui.warn(_("update failed to remove %s: %s!\n") % |
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|
335 (f, inst.strerror)) |
3673
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white space and line break cleanups
Thomas Arendsen Hein <thomas@intevation.de>
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3620
diff
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|
336 removed += 1 |
3314
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3313
diff
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|
337 elif m == "m": # merge |
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338 f2, fd, flag, move = a[2:] |
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339 r = filemerge(repo, f, f2, wctx, mctx) |
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340 if r > 0: |
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|
341 unresolved += 1 |
3315
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342 else: |
3407
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343 if r is None: |
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344 updated += 1 |
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345 else: |
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346 merged += 1 |
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|
347 if f != fd: |
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348 repo.ui.debug(_("copying %s to %s\n") % (f, fd)) |
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349 repo.wwrite(fd, repo.wread(f)) |
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350 if move: |
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351 repo.ui.debug(_("removing %s\n") % f) |
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352 os.unlink(repo.wjoin(f)) |
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353 util.set_exec(repo.wjoin(fd), flag) |
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354 elif m == "g": # get |
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355 flag = a[2] |
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356 repo.ui.note(_("getting %s\n") % f) |
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357 t = mctx.filectx(f).data() |
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358 repo.wwrite(f, t) |
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359 util.set_exec(repo.wjoin(f), flag) |
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360 updated += 1 |
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361 elif m == "d": # directory rename |
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362 f2, fd, flag = a[2:] |
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|
363 if f: |
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|
364 repo.ui.note(_("moving %s to %s\n") % (f, fd)) |
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365 t = wctx.filectx(f).data() |
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|
366 repo.wwrite(fd, t) |
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367 util.set_exec(repo.wjoin(fd), flag) |
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368 util.unlink(repo.wjoin(f)) |
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|
369 if f2: |
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370 repo.ui.note(_("getting %s to %s\n") % (f2, fd)) |
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371 t = mctx.filectx(f2).data() |
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372 repo.wwrite(fd, t) |
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373 util.set_exec(repo.wjoin(fd), flag) |
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|
374 updated += 1 |
3112
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375 elif m == "e": # exec |
3309
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376 flag = a[2] |
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377 util.set_exec(repo.wjoin(f), flag) |
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378 |
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379 return updated, merged, removed, unresolved |
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380 |
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381 def recordupdates(repo, action, branchmerge): |
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382 "record merge actions to the dirstate" |
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383 |
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384 for a in action: |
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385 f, m = a[:2] |
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386 if m == "r": # remove |
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387 if branchmerge: |
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388 repo.dirstate.update([f], 'r') |
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389 else: |
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390 repo.dirstate.forget([f]) |
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391 elif m == "f": # forget |
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392 repo.dirstate.forget([f]) |
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393 elif m == "g": # get |
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394 if branchmerge: |
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395 repo.dirstate.update([f], 'n', st_mtime=-1) |
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396 else: |
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397 repo.dirstate.update([f], 'n') |
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398 elif m == "m": # merge |
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399 f2, fd, flag, move = a[2:] |
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400 if branchmerge: |
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401 # We've done a branch merge, mark this file as merged |
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402 # so that we properly record the merger later |
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403 repo.dirstate.update([fd], 'm') |
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404 if f != f2: # copy/rename |
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405 if move: |
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406 repo.dirstate.update([f], 'r') |
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407 if f != fd: |
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408 repo.dirstate.copy(f, fd) |
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409 else: |
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410 repo.dirstate.copy(f2, fd) |
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411 else: |
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412 # We've update-merged a locally modified file, so |
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413 # we set the dirstate to emulate a normal checkout |
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414 # of that file some time in the past. Thus our |
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415 # merge will appear as a normal local file |
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416 # modification. |
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417 repo.dirstate.update([fd], 'n', st_size=-1, st_mtime=-1) |
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418 if move: |
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419 repo.dirstate.forget([f]) |
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420 elif m == "d": # directory rename |
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421 f2, fd, flag = a[2:] |
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422 if branchmerge: |
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423 repo.dirstate.update([fd], 'a') |
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424 if f: |
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425 repo.dirstate.update([f], 'r') |
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426 repo.dirstate.copy(f, fd) |
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427 if f2: |
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428 repo.dirstate.copy(f2, fd) |
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429 else: |
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430 repo.dirstate.update([fd], 'n') |
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431 if f: |
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432 repo.dirstate.forget([f]) |
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433 |
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434 def update(repo, node, branchmerge, force, partial, wlock): |
3322
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435 """ |
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436 Perform a merge between the working directory and the given node |
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437 |
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438 branchmerge = whether to merge between branches |
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439 force = whether to force branch merging or file overwriting |
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440 partial = a function to filter file lists (dirstate not updated) |
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441 wlock = working dir lock, if already held |
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442 """ |
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443 |
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444 if not wlock: |
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445 wlock = repo.wlock() |
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446 |
3320 | 447 overwrite = force and not branchmerge |
448 forcemerge = force and branchmerge | |
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449 wc = repo.workingctx() |
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450 pl = wc.parents() |
3320 | 451 p1, p2 = pl[0], repo.changectx(node) |
452 pa = p1.ancestor(p2) | |
453 fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2) | |
454 | |
455 ### check phase | |
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456 if not overwrite and len(pl) > 1: |
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457 raise util.Abort(_("outstanding uncommitted merges")) |
3320 | 458 if pa == p1 or pa == p2: # is there a linear path from p1 to p2? |
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459 if branchmerge: |
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460 raise util.Abort(_("there is nothing to merge, just use " |
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461 "'hg update' or look at 'hg heads'")) |
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462 elif not (overwrite or branchmerge): |
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463 raise util.Abort(_("update spans branches, use 'hg merge' " |
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464 "or 'hg update -C' to lose changes")) |
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465 if branchmerge and not forcemerge: |
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466 if wc.files(): |
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467 raise util.Abort(_("outstanding uncommitted changes")) |
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468 |
3320 | 469 ### calculate phase |
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470 action = [] |
3108
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471 if not force: |
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472 checkunknown(wc, p2) |
3786 | 473 if not util.checkfolding(repo.path): |
474 checkcollision(p2) | |
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475 if not branchmerge: |
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476 action += forgetremoved(wc, p2) |
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477 action += manifestmerge(repo, wc, p2, pa, overwrite, partial) |
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478 |
2917
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479 ### apply phase |
3320 | 480 if not branchmerge: # just jump to the new rev |
481 fp1, fp2, xp1, xp2 = fp2, nullid, xp2, '' | |
3302
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482 if not partial: |
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483 repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2) |
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484 |
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485 stats = applyupdates(repo, action, wc, p2) |
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486 |
2825
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2824
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487 if not partial: |
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488 recordupdates(repo, action, branchmerge) |
3320 | 489 repo.dirstate.setparents(fp1, fp2) |
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490 repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3]) |
3441 | 491 if not branchmerge: |
3774
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|
492 b = util.tolocal(p2.branch()) |
3442 | 493 repo.opener("branch", "w").write(p2.branch() + "\n") |
3320 | 494 |
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|
495 return stats |
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496 |