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annotate mercurial/merge.py @ 2971:33dcf03ef45f

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merge: hoist partial code out of manifest loops
author Matt Mackall <mpm@selenic.com>
date Tue, 22 Aug 2006 16:23:29 -0500
parents fa9c769fee8a
children ad558f297eb1
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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(), "util os tempfile")
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12
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13 def fmerge(f, local, other, ancestor):
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14 """merge executable flags"""
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15 a, b, c = ancestor.execf(f), local.execf(f), other.execf(f)
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16 return ((a^b) | (a^c)) ^ a
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17
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18 def merge3(repo, fn, my, other, p1, p2):
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19 """perform a 3-way merge in the working directory"""
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20
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21 def temp(prefix, node):
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22 pre = "%s~%s." % (os.path.basename(fn), 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(fn, fl.read(node), 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 fl = repo.file(fn)
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30 base = fl.ancestor(my, other)
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31 a = repo.wjoin(fn)
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32 b = temp("base", base)
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33 c = temp("other", other)
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34
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35 repo.ui.note(_("resolving %s\n") % fn)
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36 repo.ui.debug(_("file %s: my %s other %s ancestor %s\n") %
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37 (fn, short(my), short(other), short(base)))
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38
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39 cmd = (os.environ.get("HGMERGE") or repo.ui.config("ui", "merge")
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40 or "hgmerge")
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41 r = util.system('%s "%s" "%s" "%s"' % (cmd, a, b, c), cwd=repo.root,
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42 environ={'HG_FILE': fn,
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43 'HG_MY_NODE': p1,
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44 'HG_OTHER_NODE': p2,
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45 'HG_FILE_MY_NODE': hex(my),
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46 'HG_FILE_OTHER_NODE': hex(other),
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47 'HG_FILE_BASE_NODE': hex(base)})
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48 if r:
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49 repo.ui.warn(_("merging %s failed!\n") % fn)
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50
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51 os.unlink(b)
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52 os.unlink(c)
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53 return r
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54
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55 def update(repo, node, branchmerge=False, force=False, partial=None,
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56 wlock=None, show_stats=True, remind=True):
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57
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58 overwrite = force and not branchmerge
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59 forcemerge = force and branchmerge
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60
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61 if not wlock:
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62 wlock = repo.wlock()
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63
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64 ### check phase
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65
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66 pl = repo.dirstate.parents()
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67 if not overwrite and pl[1] != nullid:
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68 raise util.Abort(_("outstanding uncommitted merges"))
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69
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70 p1, p2 = pl[0], node
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71 pa = repo.changelog.ancestor(p1, p2)
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72
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73 # are we going backwards?
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74 backwards = (pa == p2)
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75
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76 # is there a linear path from p1 to p2?
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77 linear_path = (pa == p1 or pa == p2)
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78 if branchmerge and linear_path:
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79 raise util.Abort(_("there is nothing to merge, just use "
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80 "'hg update' or look at 'hg heads'"))
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81
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82 if not linear_path and not (overwrite or branchmerge):
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83 raise util.Abort(_("update spans branches, use 'hg merge' "
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84 "or 'hg update -C' to lose changes"))
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85
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86 modified, added, removed, deleted, unknown = repo.status()[:5]
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87 if branchmerge and not forcemerge:
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88 if modified or added or removed:
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89 raise util.Abort(_("outstanding uncommitted changes"))
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90
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91 m1n = repo.changelog.read(p1)[0]
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92 m2n = repo.changelog.read(p2)[0]
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93 man = repo.manifest.ancestor(m1n, m2n)
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94 m1 = repo.manifest.read(m1n)
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95 m2 = repo.manifest.read(m2n).copy()
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96 ma = repo.manifest.read(man)
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97
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98 if not force:
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99 for f in unknown:
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100 if f in m2:
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101 if repo.file(f).cmp(m2[f], repo.wread(f)):
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102 raise util.Abort(_("'%s' already exists in the working"
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103 " dir and differs from remote") % f)
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104
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105 # resolve the manifest to determine which files
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106 # we care about merging
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107 repo.ui.note(_("resolving manifests\n"))
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108 repo.ui.debug(_(" overwrite %s branchmerge %s partial %s linear %s\n") %
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109 (overwrite, branchmerge, bool(partial), linear_path))
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110 repo.ui.debug(_(" ancestor %s local %s remote %s\n") %
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111 (short(man), short(m1n), short(m2n)))
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112
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113 merge = {}
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114 get = {}
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115 remove = []
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116 forget = []
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117
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118 # construct a working dir manifest
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119 mw = m1.copy()
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120 umap = dict.fromkeys(unknown)
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121
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122 for f in added + modified + unknown:
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123 mw[f] = ""
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124 # is the wfile new and matches m2?
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125 if (f not in m1 and f in m2 and
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126 not repo.file(f).cmp(m2[f], repo.wread(f))):
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127 mw[f] = m2[f]
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128
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129 mw.set(f, util.is_exec(repo.wjoin(f), mw.execf(f)))
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130
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131 for f in deleted + removed:
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132 if f in mw:
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133 del mw[f]
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134
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135 # If we're jumping between revisions (as opposed to merging),
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136 # and if neither the working directory nor the target rev has
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137 # the file, then we need to remove it from the dirstate, to
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138 # prevent the dirstate from listing the file when it is no
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139 # longer in the manifest.
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140 if linear_path and f not in m2:
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141 forget.append(f)
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142
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143 if partial:
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144 for f in mw.keys():
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145 if not partial(f): del mw[f]
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146 for f in m2.keys():
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147 if not partial(f): del m2[f]
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148
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149 # Compare manifests
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150 for f, n in mw.iteritems():
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151 if f in m2:
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152 queued = 0
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153
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154 # are files different?
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155 if n != m2[f]:
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156 a = ma.get(f, nullid)
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157 # are both different from the ancestor?
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158 if n != a and m2[f] != a:
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159 repo.ui.debug(_(" %s versions differ, resolve\n") % f)
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160 merge[f] = (fmerge(f, mw, m2, ma), m1.get(f, nullid), m2[f])
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161 queued = 1
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162 # are we clobbering?
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163 # is remote's version newer?
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164 # or are we going back in time and clean?
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165 elif overwrite or m2[f] != a or (backwards and mw[f] == m1[f]):
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166 repo.ui.debug(_(" remote %s is newer, get\n") % f)
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167 get[f] = (m2.execf(f), m2[f])
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168 queued = 1
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169 elif f in umap or f in added:
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170 # this unknown file is the same as the checkout
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171 # we need to reset the dirstate if the file was added
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172 get[f] = (m2.execf(f), m2[f])
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173
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174 # do we still need to look at mode bits?
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175 if not queued and mw.execf(f) != m2.execf(f):
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176 if overwrite:
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177 repo.ui.debug(_(" updating permissions for %s\n") % f)
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178 util.set_exec(repo.wjoin(f), m2.execf(f))
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179 else:
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180 if fmerge(f, mw, m2, ma) != mw.execf(f):
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181 repo.ui.debug(_(" updating permissions for %s\n")
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182 % f)
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183 util.set_exec(repo.wjoin(f), mode)
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184 del m2[f]
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185 elif f in ma:
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186 if n != ma[f]:
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187 r = _("d")
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188 if not overwrite:
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189 r = repo.ui.prompt(
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190 (_(" local changed %s which remote deleted\n") % f) +
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191 _("(k)eep or (d)elete?"), _("[kd]"), _("k"))
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192 if r == _("d"):
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193 remove.append(f)
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194 else:
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195 repo.ui.debug(_("other deleted %s\n") % f)
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196 remove.append(f) # other deleted it
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197 else:
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198 # file is created on branch or in working directory
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199 if overwrite and f not in umap:
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200 repo.ui.debug(_("remote deleted %s, clobbering\n") % f)
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201 remove.append(f)
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202 elif n == m1.get(f, nullid): # same as parent
2968
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203 if backwards:
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204 repo.ui.debug(_("remote deleted %s\n") % f)
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205 remove.append(f)
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206 else:
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diff changeset
207 repo.ui.debug(_("local modified %s, keeping\n") % f)
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208 else:
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diff changeset
209 repo.ui.debug(_("working dir created %s, keeping\n") % f)
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diff changeset
210
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diff changeset
211 for f, n in m2.iteritems():
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diff changeset
212 if f[0] == "/":
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213 continue
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214 if f in ma and n != ma[f]:
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215 r = _("k")
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216 if not overwrite:
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diff changeset
217 r = repo.ui.prompt(
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218 (_("remote changed %s which local deleted\n") % f) +
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219 _("(k)eep or (d)elete?"), _("[kd]"), _("k"))
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220 if r == _("k"):
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diff changeset
221 get[f] = (m2.execf(f), n)
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222 elif f not in ma:
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223 repo.ui.debug(_("remote created %s\n") % f)
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224 get[f] = (m2.execf(f), n)
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225 else:
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226 if overwrite or backwards:
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227 repo.ui.debug(_("local deleted %s, recreating\n") % f)
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228 get[f] = (m2.execf(f), n)
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229 else:
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230 repo.ui.debug(_("local deleted %s\n") % f)
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231
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diff changeset
232 del mw, m1, m2, ma
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233
2897
dd032b0f02ac merge: move forgets to the apply stage
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diff changeset
234 ### apply phase
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235
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236 if overwrite:
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diff changeset
237 for f in merge:
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diff changeset
238 get[f] = merge[f][:2]
2775
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diff changeset
239 merge = {}
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diff changeset
240
2815
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diff changeset
241 if linear_path or overwrite:
2775
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parents:
diff changeset
242 # we don't need to do any magic, just jump to the new rev
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diff changeset
243 p1, p2 = p2, nullid
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diff changeset
244
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diff changeset
245 xp1 = hex(p1)
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diff changeset
246 xp2 = hex(p2)
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diff changeset
247 if p2 == nullid: xxp2 = ''
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diff changeset
248 else: xxp2 = xp2
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249
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250 repo.hook('preupdate', throw=True, parent1=xp1, parent2=xxp2)
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251
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diff changeset
252 # get the files we don't need to change
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diff changeset
253 files = get.keys()
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diff changeset
254 files.sort()
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diff changeset
255 for f in files:
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diff changeset
256 flag, node = get[f]
2775
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diff changeset
257 if f[0] == "/":
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diff changeset
258 continue
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diff changeset
259 repo.ui.note(_("getting %s\n") % f)
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diff changeset
260 t = repo.file(f).read(node)
2775
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diff changeset
261 repo.wwrite(f, t)
2837
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diff changeset
262 util.set_exec(repo.wjoin(f), flag)
2775
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diff changeset
263
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diff changeset
264 # merge the tricky bits
2813
56f99f5aab34 Merge: refactor err and failedmerge -> unresolved
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parents: 2812
diff changeset
265 unresolved = []
2775
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diff changeset
266 files = merge.keys()
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diff changeset
267 files.sort()
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diff changeset
268 for f in files:
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diff changeset
269 repo.ui.status(_("merging %s\n") % f)
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diff changeset
270 flag, my, other = merge[f]
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diff changeset
271 ret = merge3(repo, f, my, other, xp1, xp2)
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diff changeset
272 if ret:
2813
56f99f5aab34 Merge: refactor err and failedmerge -> unresolved
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parents: 2812
diff changeset
273 unresolved.append(f)
2775
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parents:
diff changeset
274 util.set_exec(repo.wjoin(f), flag)
2899
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parents: 2898
diff changeset
275
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diff changeset
276 remove.sort()
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diff changeset
277 for f in remove:
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diff changeset
278 repo.ui.note(_("removing %s\n") % f)
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diff changeset
279 util.audit_path(f)
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parents: 2898
diff changeset
280 try:
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parents: 2898
diff changeset
281 util.unlink(repo.wjoin(f))
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diff changeset
282 except OSError, inst:
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parents: 2898
diff changeset
283 if inst.errno != errno.ENOENT:
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diff changeset
284 repo.ui.warn(_("update failed to remove %s: %s!\n") %
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parents: 2898
diff changeset
285 (f, inst.strerror))
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parents: 2898
diff changeset
286
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diff changeset
287 # update dirstate
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parents: 2898
diff changeset
288 if not partial:
8743188f4d2e merge: consolidate dirstate updates
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parents: 2898
diff changeset
289 repo.dirstate.setparents(p1, p2)
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parents: 2898
diff changeset
290 repo.dirstate.forget(forget)
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parents: 2898
diff changeset
291 if branchmerge:
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parents: 2898
diff changeset
292 repo.dirstate.update(remove, 'r')
8743188f4d2e merge: consolidate dirstate updates
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parents: 2898
diff changeset
293 else:
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parents: 2898
diff changeset
294 repo.dirstate.forget(remove)
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diff changeset
295
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diff changeset
296 files = get.keys()
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diff changeset
297 files.sort()
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parents: 2898
diff changeset
298 for f in files:
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parents: 2898
diff changeset
299 if branchmerge:
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Matt Mackall <mpm@selenic.com>
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300 repo.dirstate.update([f], 'n', st_mtime=-1)
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301 else:
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302 repo.dirstate.update([f], 'n')
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303
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304 files = merge.keys()
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305 files.sort()
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306 for f in files:
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307 if branchmerge:
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308 # We've done a branch merge, mark this file as merged
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309 # so that we properly record the merger later
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310 repo.dirstate.update([f], 'm')
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311 else:
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312 # We've update-merged a locally modified file, so
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313 # we set the dirstate to emulate a normal checkout
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314 # of that file some time in the past. Thus our
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315 # merge will appear as a normal local file
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316 # modification.
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317 fl = repo.file(f)
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318 f_len = fl.size(fl.rev(other))
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319 repo.dirstate.update([f], 'n', st_size=f_len, st_mtime=-1)
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320
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321 if show_stats:
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322 stats = ((len(get), _("updated")),
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323 (len(merge) - len(unresolved), _("merged")),
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324 (len(remove), _("removed")),
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325 (len(unresolved), _("unresolved")))
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326 note = ", ".join([_("%d files %s") % s for s in stats])
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327 repo.ui.status("%s\n" % note)
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328 if not partial:
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329 if branchmerge:
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330 if unresolved:
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331 repo.ui.status(_("There are unresolved merges,"
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332 " you can redo the full merge using:\n"
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333 " hg update -C %s\n"
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334 " hg merge %s\n"
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335 % (repo.changelog.rev(p1),
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336 repo.changelog.rev(p2))))
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337 elif remind:
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338 repo.ui.status(_("(branch merge, don't forget to commit)\n"))
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339 elif unresolved:
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340 repo.ui.status(_("There are unresolved merges with"
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341 " locally modified files.\n"))
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342
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343 repo.hook('update', parent1=xp1, parent2=xxp2, error=len(unresolved))
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344 return len(unresolved)
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345