Mercurial > hg
annotate mercurial/merge.py @ 6656:2cbe0f72c379
Merge with crew-stable
author | Patrick Mezard <pmezard@gmail.com> |
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date | Sat, 07 Jun 2008 11:43:16 +0200 |
parents | 4b92591c69a7 |
children | b148e9099133 |
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, 2007 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 |
6518 | 8 from node import nullid, nullrev, hex, bin |
3891 | 9 from i18n import _ |
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10 import errno, util, os, filemerge, copies, shutil |
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11 |
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12 class mergestate(object): |
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13 '''track 3-way merge state of individual files''' |
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14 def __init__(self, repo): |
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15 self._repo = repo |
6518 | 16 self._read() |
17 def reset(self, node): | |
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18 self._state = {} |
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19 self._local = node |
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20 shutil.rmtree(self._repo.join("merge"), True) |
6518 | 21 def _read(self): |
22 self._state = {} | |
23 try: | |
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24 localnode = None |
6518 | 25 f = self._repo.opener("merge/state") |
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26 for i, l in enumerate(f): |
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27 if i == 0: |
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28 localnode = l[:-1] |
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29 else: |
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30 bits = l[:-1].split("\0") |
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31 self._state[bits[0]] = bits[1:] |
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32 self._local = bin(localnode) |
6518 | 33 except IOError, err: |
34 if err.errno != errno.ENOENT: | |
35 raise | |
36 def _write(self): | |
37 f = self._repo.opener("merge/state", "w") | |
38 f.write(hex(self._local) + "\n") | |
39 for d, v in self._state.items(): | |
40 f.write("\0".join([d] + v) + "\n") | |
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41 def add(self, fcl, fco, fca, fd, flags): |
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42 hash = util.sha1(fcl.path()).hexdigest() |
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43 self._repo.opener("merge/" + hash, "w").write(fcl.data()) |
6518 | 44 self._state[fd] = ['u', hash, fcl.path(), fca.path(), |
45 hex(fca.filenode()), fco.path(), flags] | |
46 self._write() | |
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47 def __contains__(self, dfile): |
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48 return dfile in self._state |
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49 def __getitem__(self, dfile): |
6518 | 50 return self._state[dfile][0] |
51 def __iter__(self): | |
52 l = self._state.keys() | |
53 l.sort() | |
54 for f in l: | |
55 yield f | |
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56 def mark(self, dfile, state): |
6518 | 57 self._state[dfile][0] = state |
58 self._write() | |
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59 def resolve(self, dfile, wctx, octx): |
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60 if self[dfile] == 'r': |
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61 return 0 |
6518 | 62 state, hash, lfile, afile, anode, ofile, flags = self._state[dfile] |
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63 f = self._repo.opener("merge/" + hash) |
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64 self._repo.wwrite(dfile, f.read(), flags) |
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65 fcd = wctx[dfile] |
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66 fco = octx[ofile] |
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67 fca = self._repo.filectx(afile, fileid=anode) |
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68 r = filemerge.filemerge(self._repo, self._local, lfile, fcd, fco, fca) |
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69 if not r: |
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70 self.mark(dfile, 'r') |
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71 return r |
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72 |
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73 def _checkunknown(wctx, mctx): |
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74 "check for collisions between unknown files and files in mctx" |
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75 for f in wctx.unknown(): |
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76 if f in mctx and mctx[f].cmp(wctx[f].data()): |
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77 raise util.Abort(_("untracked file in working directory differs" |
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78 " from file in requested revision: '%s'") % f) |
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79 |
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80 def _checkcollision(mctx): |
3785 | 81 "check for case folding collisions in the destination context" |
82 folded = {} | |
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83 for fn in mctx: |
3785 | 84 fold = fn.lower() |
85 if fold in folded: | |
86 raise util.Abort(_("case-folding collision between %s and %s") | |
87 % (fn, folded[fold])) | |
88 folded[fold] = fn | |
89 | |
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90 def _forgetremoved(wctx, mctx, branchmerge): |
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91 """ |
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92 Forget removed files |
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93 |
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94 If we're jumping between revisions (as opposed to merging), and if |
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95 neither the working directory nor the target rev has the file, |
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96 then we need to remove it from the dirstate, to prevent the |
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97 dirstate from listing the file when it is no longer in the |
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98 manifest. |
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99 |
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100 If we're merging, and the other revision has removed a file |
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101 that is not present in the working directory, we need to mark it |
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102 as removed. |
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103 """ |
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104 |
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105 action = [] |
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106 state = branchmerge and 'r' or 'f' |
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107 for f in wctx.deleted(): |
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108 if f not in mctx: |
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109 action.append((f, state)) |
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110 |
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111 if not branchmerge: |
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112 for f in wctx.removed(): |
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113 if f not in mctx: |
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114 action.append((f, "f")) |
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115 |
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116 return action |
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117 |
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118 def manifestmerge(repo, p1, p2, pa, overwrite, partial): |
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119 """ |
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120 Merge p1 and p2 with ancestor ma and generate merge action list |
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121 |
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122 overwrite = whether we clobber working files |
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123 partial = function to filter file lists |
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124 """ |
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125 |
3314 | 126 repo.ui.note(_("resolving manifests\n")) |
127 repo.ui.debug(_(" overwrite %s partial %s\n") % (overwrite, bool(partial))) | |
128 repo.ui.debug(_(" ancestor %s local %s remote %s\n") % (pa, p1, p2)) | |
129 | |
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130 m1 = p1.manifest() |
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131 m2 = p2.manifest() |
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132 ma = pa.manifest() |
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133 backwards = (pa == p2) |
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135 copy, copied, diverge = {}, {}, {} |
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136 |
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137 def fmerge(f, f2=None, fa=None): |
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138 """merge flags""" |
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139 if not f2: |
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140 f2 = f |
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141 fa = f |
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142 a, m, n = ma.flags(fa), m1.flags(f), m2.flags(f2) |
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143 if m == n: # flags agree |
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144 return m # unchanged |
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145 if m and n: # flags are set but don't agree |
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146 if not a: # both differ from parent |
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147 r = repo.ui.prompt( |
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148 _(" conflicting flags for %s\n" |
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149 "(n)one, e(x)ec or sym(l)ink?") % f, "[nxl]", "n") |
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150 return r != "n" and r or '' |
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151 if m == a: |
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152 return n # changed from m to n |
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153 return m # changed from n to m |
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154 if m and m != a: # changed from a to m |
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155 return m |
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156 if n and n != a: # changed from a to n |
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157 return n |
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158 return '' # flag was cleared |
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159 |
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160 def act(msg, m, f, *args): |
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161 repo.ui.debug(" %s: %s -> %s\n" % (f, msg, m)) |
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162 action.append((f, m) + args) |
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163 |
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164 if pa and not (backwards or overwrite): |
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165 if repo.ui.configbool("merge", "followcopies", True): |
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166 dirs = repo.ui.configbool("merge", "followdirs", True) |
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167 copy, diverge = copies.copies(repo, p1, p2, pa, dirs) |
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168 copied = dict.fromkeys(copy.values()) |
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169 for of, fl in diverge.items(): |
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170 act("divergent renames", "dr", of, fl) |
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171 |
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172 # Compare manifests |
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173 for f, n in m1.iteritems(): |
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174 if partial and not partial(f): |
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175 continue |
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176 if f in m2: |
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177 if overwrite or backwards: |
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178 rflags = m2.flags(f) |
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179 else: |
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180 rflags = fmerge(f) |
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181 # are files different? |
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182 if n != m2[f]: |
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183 a = ma.get(f, nullid) |
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184 # are we clobbering? |
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185 if overwrite: |
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186 act("clobbering", "g", f, rflags) |
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187 # or are we going back in time and clean? |
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188 elif backwards and not n[20:]: |
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189 act("reverting", "g", f, rflags) |
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190 # are both different from the ancestor? |
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191 elif n != a and m2[f] != a: |
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192 act("versions differ", "m", f, f, f, rflags, False) |
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193 # is remote's version newer? |
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194 elif m2[f] != a: |
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195 act("remote is newer", "g", f, rflags) |
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196 # local is newer, not overwrite, check mode bits |
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197 elif m1.flags(f) != rflags: |
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198 act("update permissions", "e", f, rflags) |
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199 # contents same, check mode bits |
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200 elif m1.flags(f) != rflags: |
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201 act("update permissions", "e", f, rflags) |
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202 elif f in copied: |
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203 continue |
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204 elif f in copy: |
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205 f2 = copy[f] |
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206 if f2 not in m2: # directory rename |
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207 act("remote renamed directory to " + f2, "d", |
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208 f, None, f2, m1.flags(f)) |
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209 elif f2 in m1: # case 2 A,B/B/B |
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210 act("local copied to " + f2, "m", |
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211 f, f2, f, fmerge(f, f2, f2), False) |
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212 else: # case 4,21 A/B/B |
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213 act("local moved to " + f2, "m", |
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214 f, f2, f, fmerge(f, f2, f2), False) |
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215 elif f in ma: |
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216 if n != ma[f] and not overwrite: |
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217 if repo.ui.prompt( |
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218 _(" local changed %s which remote deleted\n" |
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219 "use (c)hanged version or (d)elete?") % f, |
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220 _("[cd]"), _("c")) == _("d"): |
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221 act("prompt delete", "r", f) |
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222 else: |
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223 act("other deleted", "r", f) |
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224 else: |
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225 # file is created on branch or in working directory |
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226 if (overwrite and n[20:] != "u") or (backwards and not n[20:]): |
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227 act("remote deleted", "r", f) |
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228 |
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229 for f, n in m2.iteritems(): |
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230 if partial and not partial(f): |
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231 continue |
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232 if f in m1: |
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233 continue |
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234 if f in copied: |
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235 continue |
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236 if f in copy: |
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237 f2 = copy[f] |
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238 if f2 not in m1: # directory rename |
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239 act("local renamed directory to " + f2, "d", |
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240 None, f, f2, m2.flags(f)) |
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241 elif f2 in m2: # rename case 1, A/A,B/A |
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242 act("remote copied to " + f, "m", |
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243 f2, f, f, fmerge(f2, f, f2), False) |
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244 else: # case 3,20 A/B/A |
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245 act("remote moved to " + f, "m", |
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246 f2, f, f, fmerge(f2, f, f2), True) |
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247 elif f in ma: |
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248 if overwrite or backwards: |
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249 act("recreating", "g", f, m2.flags(f)) |
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250 elif n != ma[f]: |
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251 if repo.ui.prompt( |
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252 _("remote changed %s which local deleted\n" |
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253 "use (c)hanged version or leave (d)eleted?") % f, |
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254 _("[cd]"), _("c")) == _("c"): |
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255 act("prompt recreating", "g", f, m2.flags(f)) |
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256 else: |
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257 act("remote created", "g", f, m2.flags(f)) |
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258 |
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259 return action |
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260 |
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261 def applyupdates(repo, action, wctx, mctx): |
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262 "apply the merge action list to the working directory" |
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263 |
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264 updated, merged, removed, unresolved = 0, 0, 0, 0 |
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265 action.sort() |
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266 |
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267 ms = mergestate(repo) |
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268 ms.reset(wctx.parents()[0].node()) |
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269 moves = [] |
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270 |
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271 # prescan for merges |
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272 for a in action: |
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273 f, m = a[:2] |
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274 if m == 'm': # merge |
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275 f2, fd, flags, move = a[2:] |
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276 repo.ui.debug(_("preserving %s for resolve of %s\n") % (f, fd)) |
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277 fcl = wctx[f] |
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278 fco = mctx[f2] |
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279 fca = fcl.ancestor(fco) or repo.filectx(f, fileid=nullrev) |
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280 ms.add(fcl, fco, fca, fd, flags) |
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281 if f != fd and move: |
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282 moves.append(f) |
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283 |
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284 # remove renamed files after safely stored |
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285 for f in moves: |
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286 if util.lexists(repo.wjoin(f)): |
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287 repo.ui.debug(_("removing %s\n") % f) |
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288 os.unlink(repo.wjoin(f)) |
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289 |
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290 audit_path = util.path_auditor(repo.root) |
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291 |
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292 for a in action: |
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293 f, m = a[:2] |
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294 if f and f[0] == "/": |
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295 continue |
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296 if m == "r": # remove |
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297 repo.ui.note(_("removing %s\n") % f) |
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298 audit_path(f) |
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299 try: |
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300 util.unlink(repo.wjoin(f)) |
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301 except OSError, inst: |
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302 if inst.errno != errno.ENOENT: |
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303 repo.ui.warn(_("update failed to remove %s: %s!\n") % |
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304 (f, inst.strerror)) |
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305 removed += 1 |
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306 elif m == "m": # merge |
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307 f2, fd, flags, move = a[2:] |
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308 r = ms.resolve(fd, wctx, mctx) |
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309 if r > 0: |
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310 unresolved += 1 |
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311 else: |
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312 if r is None: |
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313 updated += 1 |
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314 else: |
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315 merged += 1 |
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316 elif m == "g": # get |
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317 flags = a[2] |
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318 repo.ui.note(_("getting %s\n") % f) |
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319 t = mctx.filectx(f).data() |
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320 repo.wwrite(f, t, flags) |
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321 updated += 1 |
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322 elif m == "d": # directory rename |
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323 f2, fd, flags = a[2:] |
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324 if f: |
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325 repo.ui.note(_("moving %s to %s\n") % (f, fd)) |
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326 t = wctx.filectx(f).data() |
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327 repo.wwrite(fd, t, flags) |
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328 util.unlink(repo.wjoin(f)) |
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329 if f2: |
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330 repo.ui.note(_("getting %s to %s\n") % (f2, fd)) |
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331 t = mctx.filectx(f2).data() |
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332 repo.wwrite(fd, t, flags) |
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333 updated += 1 |
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334 elif m == "dr": # divergent renames |
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335 fl = a[2] |
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336 repo.ui.warn("warning: detected divergent renames of %s to:\n" % f) |
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337 for nf in fl: |
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338 repo.ui.warn(" %s\n" % nf) |
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339 elif m == "e": # exec |
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340 flags = a[2] |
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342 |
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343 return updated, merged, removed, unresolved |
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344 |
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345 def recordupdates(repo, action, branchmerge): |
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346 "record merge actions to the dirstate" |
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347 |
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348 for a in action: |
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349 f, m = a[:2] |
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350 if m == "r": # remove |
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351 if branchmerge: |
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352 repo.dirstate.remove(f) |
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353 else: |
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354 repo.dirstate.forget(f) |
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355 elif m == "f": # forget |
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356 repo.dirstate.forget(f) |
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357 elif m in "ge": # get or exec change |
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358 if branchmerge: |
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359 repo.dirstate.normaldirty(f) |
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360 else: |
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361 repo.dirstate.normal(f) |
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362 elif m == "m": # merge |
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363 f2, fd, flag, move = a[2:] |
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364 if branchmerge: |
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365 # We've done a branch merge, mark this file as merged |
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366 # so that we properly record the merger later |
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367 repo.dirstate.merge(fd) |
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368 if f != f2: # copy/rename |
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369 if move: |
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370 repo.dirstate.remove(f) |
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371 if f != fd: |
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372 repo.dirstate.copy(f, fd) |
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373 else: |
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374 repo.dirstate.copy(f2, fd) |
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375 else: |
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376 # We've update-merged a locally modified file, so |
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377 # we set the dirstate to emulate a normal checkout |
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378 # of that file some time in the past. Thus our |
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379 # merge will appear as a normal local file |
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380 # modification. |
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381 repo.dirstate.normallookup(fd) |
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382 if move: |
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383 repo.dirstate.forget(f) |
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384 elif m == "d": # directory rename |
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385 f2, fd, flag = a[2:] |
4819
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386 if not f2 and f not in repo.dirstate: |
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387 # untracked file moved |
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388 continue |
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389 if branchmerge: |
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390 repo.dirstate.add(fd) |
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391 if f: |
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392 repo.dirstate.remove(f) |
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393 repo.dirstate.copy(f, fd) |
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394 if f2: |
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395 repo.dirstate.copy(f2, fd) |
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396 else: |
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397 repo.dirstate.normal(fd) |
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398 if f: |
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399 repo.dirstate.forget(f) |
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400 |
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401 def update(repo, node, branchmerge, force, partial): |
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402 """ |
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403 Perform a merge between the working directory and the given node |
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404 |
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405 branchmerge = whether to merge between branches |
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406 force = whether to force branch merging or file overwriting |
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407 partial = a function to filter file lists (dirstate not updated) |
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408 """ |
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409 |
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410 wlock = repo.wlock() |
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411 try: |
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412 wc = repo.workingctx() |
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413 if node is None: |
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414 # tip of current branch |
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415 try: |
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416 node = repo.branchtags()[wc.branch()] |
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417 except KeyError: |
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418 if wc.branch() == "default": # no default branch! |
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419 node = repo.lookup("tip") # update to tip |
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420 else: |
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421 raise util.Abort(_("branch %s not found") % wc.branch()) |
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422 overwrite = force and not branchmerge |
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423 pl = wc.parents() |
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424 p1, p2 = pl[0], repo.changectx(node) |
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425 pa = p1.ancestor(p2) |
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426 fp1, fp2, xp1, xp2 = p1.node(), p2.node(), str(p1), str(p2) |
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427 fastforward = False |
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429 ### check phase |
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430 if not overwrite and len(pl) > 1: |
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431 raise util.Abort(_("outstanding uncommitted merges")) |
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432 if branchmerge: |
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433 if pa == p2: |
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434 raise util.Abort(_("can't merge with ancestor")) |
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435 elif pa == p1: |
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436 if p1.branch() != p2.branch(): |
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437 fastforward = True |
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438 else: |
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439 raise util.Abort(_("nothing to merge (use 'hg update'" |
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440 " or check 'hg heads')")) |
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441 if not force and (wc.files() or wc.deleted()): |
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442 raise util.Abort(_("outstanding uncommitted changes")) |
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443 elif not overwrite: |
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444 if pa == p1 or pa == p2: # linear |
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445 pass # all good |
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446 elif p1.branch() == p2.branch(): |
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447 if wc.files() or wc.deleted(): |
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448 raise util.Abort(_("crosses branches (use 'hg merge' or " |
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449 "'hg update -C' to discard changes)")) |
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450 raise util.Abort(_("crosses branches (use 'hg merge' " |
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451 "or 'hg update -C')")) |
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452 elif wc.files() or wc.deleted(): |
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453 raise util.Abort(_("crosses named branches (use " |
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454 "'hg update -C' to discard changes)")) |
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455 else: |
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456 # Allow jumping branches if there are no changes |
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457 overwrite = True |
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458 |
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459 ### calculate phase |
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460 action = [] |
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461 if not force: |
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462 _checkunknown(wc, p2) |
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463 if not util.checkfolding(repo.path): |
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464 _checkcollision(p2) |
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465 action += _forgetremoved(wc, p2, branchmerge) |
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466 action += manifestmerge(repo, wc, p2, pa, overwrite, partial) |
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467 |
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468 ### apply phase |
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469 if not branchmerge: # just jump to the new rev |
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470 fp1, fp2, xp1, xp2 = fp2, nullid, xp2, '' |
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471 if not partial: |
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472 repo.hook('preupdate', throw=True, parent1=xp1, parent2=xp2) |
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473 |
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474 stats = applyupdates(repo, action, wc, p2) |
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475 |
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476 if not partial: |
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477 recordupdates(repo, action, branchmerge) |
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478 repo.dirstate.setparents(fp1, fp2) |
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479 if not branchmerge and not fastforward: |
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480 repo.dirstate.setbranch(p2.branch()) |
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481 repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3]) |
3314 | 482 |
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483 return stats |
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484 finally: |
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485 del wlock |