Mercurial > hg
annotate mercurial/repair.py @ 17509:f7767f52e9eb
spelling: recursion
author | timeless@mozdev.org |
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date | Fri, 17 Aug 2012 13:58:18 -0700 |
parents | ec7b9bec19c9 |
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1 # repair.py - functions for repository repair for mercurial |
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2 # |
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3 # Copyright 2005, 2006 Chris Mason <mason@suse.com> |
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4 # Copyright 2007 Matt Mackall |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
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8 |
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9 from mercurial import changegroup, bookmarks |
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10 from mercurial.node import short |
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11 from mercurial.i18n import _ |
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12 import os |
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13 import errno |
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14 |
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15 def _bundle(repo, bases, heads, node, suffix, compress=True): |
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16 """create a bundle with the specified revisions as a backup""" |
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17 cg = repo.changegroupsubset(bases, heads, 'strip') |
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18 backupdir = repo.join("strip-backup") |
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19 if not os.path.isdir(backupdir): |
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20 os.mkdir(backupdir) |
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21 name = os.path.join(backupdir, "%s-%s.hg" % (short(node), suffix)) |
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22 if compress: |
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23 bundletype = "HG10BZ" |
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24 else: |
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25 bundletype = "HG10UN" |
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26 return changegroup.writebundle(cg, name, bundletype) |
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27 |
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28 def _collectfiles(repo, striprev): |
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29 """find out the filelogs affected by the strip""" |
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30 files = set() |
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31 |
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32 for x in xrange(striprev, len(repo)): |
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33 files.update(repo[x].files()) |
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34 |
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35 return sorted(files) |
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36 |
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37 def _collectbrokencsets(repo, files, striprev): |
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38 """return the changesets which will be broken by the truncation""" |
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39 s = set() |
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40 def collectone(revlog): |
16628 | 41 linkgen = (revlog.linkrev(i) for i in revlog) |
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42 # find the truncation point of the revlog |
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44 if lrev >= striprev: |
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45 break |
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46 # see if any revision after this point has a linkrev |
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47 # less than striprev (those will be broken by strip) |
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49 if lrev < striprev: |
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50 s.add(lrev) |
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51 |
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52 collectone(repo.manifest) |
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53 for fname in files: |
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54 collectone(repo.file(fname)) |
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55 |
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56 return s |
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57 |
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58 def strip(ui, repo, nodelist, backup="all", topic='backup'): |
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59 # It simplifies the logic around updating the branchheads cache if we only |
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60 # have to consider the effect of the stripped revisions and not revisions |
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61 # missing because the cache is out-of-date. |
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62 repo.updatebranchcache() |
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63 |
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64 cl = repo.changelog |
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65 # TODO handle undo of merge sets |
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66 if isinstance(nodelist, str): |
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67 nodelist = [nodelist] |
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68 striplist = [cl.rev(node) for node in nodelist] |
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69 striprev = min(striplist) |
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70 |
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71 # Generate set of branches who will have nodes stripped. |
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72 striprevs = repo.revs("%ld::", striplist) |
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73 stripbranches = set([repo[rev].branch() for rev in striprevs]) |
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74 |
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75 # Set of potential new heads resulting from the strip. The parents of any |
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76 # node removed could be a new head because the node to be removed could have |
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77 # been the only child of the parent. |
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78 newheadrevs = repo.revs("parents(%ld::) - %ld::", striprevs, striprevs) |
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79 newheadnodes = set([cl.node(rev) for rev in newheadrevs]) |
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80 newheadbranches = set([repo[rev].branch() for rev in newheadrevs]) |
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81 |
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82 keeppartialbundle = backup == 'strip' |
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83 |
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84 # Some revisions with rev > striprev may not be descendants of striprev. |
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85 # We have to find these revisions and put them in a bundle, so that |
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86 # we can restore them after the truncations. |
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87 # To create the bundle we use repo.changegroupsubset which requires |
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88 # the list of heads and bases of the set of interesting revisions. |
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89 # (head = revision in the set that has no descendant in the set; |
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90 # base = revision in the set that has no ancestor in the set) |
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91 tostrip = set(striplist) |
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92 for rev in striplist: |
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93 for desc in cl.descendants([rev]): |
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94 tostrip.add(desc) |
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95 |
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96 files = _collectfiles(repo, striprev) |
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97 saverevs = _collectbrokencsets(repo, files, striprev) |
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98 |
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99 # compute heads |
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100 saveheads = set(saverevs) |
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101 for r in xrange(striprev + 1, len(cl)): |
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102 if r not in tostrip: |
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103 saverevs.add(r) |
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104 saveheads.difference_update(cl.parentrevs(r)) |
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105 saveheads.add(r) |
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106 saveheads = [cl.node(r) for r in saveheads] |
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107 |
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108 # compute base nodes |
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109 if saverevs: |
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110 descendants = set(cl.descendants(saverevs)) |
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111 saverevs.difference_update(descendants) |
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112 savebases = [cl.node(r) for r in saverevs] |
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113 stripbases = [cl.node(r) for r in tostrip] |
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114 rset = ' or '.join([str(r) for r in tostrip]) |
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115 newbmtarget = repo.revs('sort(heads(ancestors(%r) - (%r)), -rev)', |
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116 rset, rset) |
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117 if newbmtarget: |
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118 newbmtarget = newbmtarget[0] |
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119 else: |
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120 newbmtarget = '.' |
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121 |
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122 bm = repo._bookmarks |
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123 updatebm = [] |
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124 for m in bm: |
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125 rev = repo[bm[m]].rev() |
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126 if rev in tostrip: |
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127 updatebm.append(m) |
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128 |
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129 # create a changegroup for all the branches we need to keep |
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130 backupfile = None |
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131 if backup == "all": |
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132 backupfile = _bundle(repo, stripbases, cl.heads(), node, topic) |
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133 repo.ui.status(_("saved backup bundle to %s\n") % backupfile) |
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134 if saveheads or savebases: |
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135 # do not compress partial bundle if we remove it from disk later |
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136 chgrpfile = _bundle(repo, savebases, saveheads, node, 'temp', |
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137 compress=keeppartialbundle) |
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138 |
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139 mfst = repo.manifest |
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140 |
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141 tr = repo.transaction("strip") |
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142 offset = len(tr.entries) |
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143 |
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144 try: |
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145 tr.startgroup() |
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146 cl.strip(striprev, tr) |
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147 mfst.strip(striprev, tr) |
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148 for fn in files: |
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149 repo.file(fn).strip(striprev, tr) |
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150 tr.endgroup() |
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151 |
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152 try: |
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153 for i in xrange(offset, len(tr.entries)): |
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154 file, troffset, ignore = tr.entries[i] |
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155 repo.sopener(file, 'a').truncate(troffset) |
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156 tr.close() |
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157 except: # re-raises |
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158 tr.abort() |
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159 raise |
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160 |
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161 if saveheads or savebases: |
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162 ui.note(_("adding branch\n")) |
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163 f = open(chgrpfile, "rb") |
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164 gen = changegroup.readbundle(f, chgrpfile) |
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165 if not repo.ui.verbose: |
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166 # silence internal shuffling chatter |
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167 repo.ui.pushbuffer() |
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168 repo.addchangegroup(gen, 'strip', 'bundle:' + chgrpfile, True) |
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169 if not repo.ui.verbose: |
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170 repo.ui.popbuffer() |
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171 f.close() |
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172 if not keeppartialbundle: |
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173 os.unlink(chgrpfile) |
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174 |
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175 # remove undo files |
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176 for undofile in repo.undofiles(): |
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177 try: |
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178 os.unlink(undofile) |
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179 except OSError, e: |
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180 if e.errno != errno.ENOENT: |
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181 ui.warn(_('error removing %s: %s\n') % (undofile, str(e))) |
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182 |
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183 for m in updatebm: |
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184 bm[m] = repo[newbmtarget].node() |
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185 bookmarks.write(repo) |
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186 except: # re-raises |
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187 if backupfile: |
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188 ui.warn(_("strip failed, full bundle stored in '%s'\n") |
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189 % backupfile) |
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190 elif saveheads: |
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191 ui.warn(_("strip failed, partial bundle stored in '%s'\n") |
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192 % chgrpfile) |
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193 raise |
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194 |
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195 if len(stripbranches) == 1 and len(newheadbranches) == 1 \ |
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196 and stripbranches == newheadbranches: |
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197 repo.destroyed(newheadnodes) |
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198 else: |
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199 # Multiple branches involved in strip. Will allow branchcache to become |
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200 # invalid and later on rebuilt from scratch |
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201 repo.destroyed() |