Mercurial > hg
annotate mercurial/repair.py @ 46924:ca0049946e9a
split: avoid strip if split is a no-op (identical to original)
Differential Revision: https://phab.mercurial-scm.org/D10389
author | Kyle Lippincott <spectral@google.com> |
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date | Mon, 12 Apr 2021 19:25:34 -0700 |
parents | ffd3e823a7e5 |
children | 7a430116f639 |
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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 Olivia 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 __future__ import absolute_import |
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10 |
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11 import errno |
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12 |
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13 from .i18n import _ |
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14 from .node import ( |
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15 hex, |
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16 short, |
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17 ) |
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18 from . import ( |
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19 bundle2, |
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20 changegroup, |
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21 discovery, |
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22 error, |
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23 exchange, |
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24 obsolete, |
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25 obsutil, |
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26 pathutil, |
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27 phases, |
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28 pycompat, |
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29 requirements, |
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30 scmutil, |
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31 ) |
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32 from .utils import ( |
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33 hashutil, |
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34 stringutil, |
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35 urlutil, |
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36 ) |
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37 |
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38 |
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39 def backupbundle( |
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40 repo, bases, heads, node, suffix, compress=True, obsolescence=True |
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41 ): |
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42 """create a bundle with the specified revisions as a backup""" |
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43 |
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44 backupdir = b"strip-backup" |
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45 vfs = repo.vfs |
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46 if not vfs.isdir(backupdir): |
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47 vfs.mkdir(backupdir) |
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48 |
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49 # Include a hash of all the nodes in the filename for uniqueness |
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50 allcommits = repo.set(b'%ln::%ln', bases, heads) |
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51 allhashes = sorted(c.hex() for c in allcommits) |
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52 totalhash = hashutil.sha1(b''.join(allhashes)).digest() |
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53 name = b"%s/%s-%s-%s.hg" % ( |
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54 backupdir, |
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55 short(node), |
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56 hex(totalhash[:4]), |
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57 suffix, |
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58 ) |
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59 |
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60 cgversion = changegroup.localversion(repo) |
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61 comp = None |
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62 if cgversion != b'01': |
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63 bundletype = b"HG20" |
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64 if compress: |
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65 comp = b'BZ' |
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66 elif compress: |
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67 bundletype = b"HG10BZ" |
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68 else: |
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69 bundletype = b"HG10UN" |
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70 |
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71 outgoing = discovery.outgoing(repo, missingroots=bases, ancestorsof=heads) |
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72 contentopts = { |
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73 b'cg.version': cgversion, |
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74 b'obsolescence': obsolescence, |
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75 b'phases': True, |
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76 } |
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77 return bundle2.writenewbundle( |
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78 repo.ui, |
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79 repo, |
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80 b'strip', |
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81 name, |
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82 bundletype, |
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83 outgoing, |
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84 contentopts, |
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85 vfs, |
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86 compression=comp, |
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87 ) |
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88 |
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89 |
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90 def _collectfiles(repo, striprev): |
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91 """find out the filelogs affected by the strip""" |
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92 files = set() |
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93 |
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94 for x in pycompat.xrange(striprev, len(repo)): |
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95 files.update(repo[x].files()) |
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96 |
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97 return sorted(files) |
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98 |
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99 |
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100 def _collectrevlog(revlog, striprev): |
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101 _, brokenset = revlog.getstrippoint(striprev) |
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102 return [revlog.linkrev(r) for r in brokenset] |
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103 |
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104 |
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105 def _collectbrokencsets(repo, files, striprev): |
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106 """return the changesets which will be broken by the truncation""" |
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107 s = set() |
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108 |
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109 for revlog in manifestrevlogs(repo): |
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110 s.update(_collectrevlog(revlog, striprev)) |
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111 for fname in files: |
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112 s.update(_collectrevlog(repo.file(fname), striprev)) |
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113 |
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114 return s |
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115 |
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116 |
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117 def strip(ui, repo, nodelist, backup=True, topic=b'backup'): |
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118 # This function requires the caller to lock the repo, but it operates |
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119 # within a transaction of its own, and thus requires there to be no current |
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120 # transaction when it is called. |
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121 if repo.currenttransaction() is not None: |
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122 raise error.ProgrammingError(b'cannot strip from inside a transaction') |
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123 |
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124 # Simple way to maintain backwards compatibility for this |
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125 # argument. |
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126 if backup in [b'none', b'strip']: |
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127 backup = False |
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128 |
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129 repo = repo.unfiltered() |
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130 repo.destroying() |
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131 vfs = repo.vfs |
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132 # load bookmark before changelog to avoid side effect from outdated |
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133 # changelog (see repo._refreshchangelog) |
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134 repo._bookmarks |
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135 cl = repo.changelog |
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136 |
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137 # TODO handle undo of merge sets |
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138 if isinstance(nodelist, bytes): |
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139 nodelist = [nodelist] |
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140 striplist = [cl.rev(node) for node in nodelist] |
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141 striprev = min(striplist) |
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142 |
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143 files = _collectfiles(repo, striprev) |
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144 saverevs = _collectbrokencsets(repo, files, striprev) |
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145 |
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146 # Some revisions with rev > striprev may not be descendants of striprev. |
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147 # We have to find these revisions and put them in a bundle, so that |
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148 # we can restore them after the truncations. |
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149 # To create the bundle we use repo.changegroupsubset which requires |
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150 # the list of heads and bases of the set of interesting revisions. |
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151 # (head = revision in the set that has no descendant in the set; |
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152 # base = revision in the set that has no ancestor in the set) |
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153 tostrip = set(striplist) |
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154 saveheads = set(saverevs) |
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155 for r in cl.revs(start=striprev + 1): |
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156 if any(p in tostrip for p in cl.parentrevs(r)): |
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157 tostrip.add(r) |
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158 |
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159 if r not in tostrip: |
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160 saverevs.add(r) |
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161 saveheads.difference_update(cl.parentrevs(r)) |
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162 saveheads.add(r) |
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163 saveheads = [cl.node(r) for r in saveheads] |
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164 |
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165 # compute base nodes |
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166 if saverevs: |
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167 descendants = set(cl.descendants(saverevs)) |
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168 saverevs.difference_update(descendants) |
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169 savebases = [cl.node(r) for r in saverevs] |
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170 stripbases = [cl.node(r) for r in tostrip] |
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171 |
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172 stripobsidx = obsmarkers = () |
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173 if repo.ui.configbool(b'devel', b'strip-obsmarkers'): |
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174 obsmarkers = obsutil.exclusivemarkers(repo, stripbases) |
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175 if obsmarkers: |
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176 stripobsidx = [ |
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177 i for i, m in enumerate(repo.obsstore) if m in obsmarkers |
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178 ] |
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179 |
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180 newbmtarget, updatebm = _bookmarkmovements(repo, tostrip) |
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181 |
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182 backupfile = None |
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183 node = nodelist[-1] |
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184 if backup: |
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185 backupfile = _createstripbackup(repo, stripbases, node, topic) |
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186 # create a changegroup for all the branches we need to keep |
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187 tmpbundlefile = None |
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188 if saveheads: |
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189 # do not compress temporary bundle if we remove it from disk later |
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190 # |
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191 # We do not include obsolescence, it might re-introduce prune markers |
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192 # we are trying to strip. This is harmless since the stripped markers |
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193 # are already backed up and we did not touched the markers for the |
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194 # saved changesets. |
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195 tmpbundlefile = backupbundle( |
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196 repo, |
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197 savebases, |
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198 saveheads, |
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199 node, |
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200 b'temp', |
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201 compress=False, |
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202 obsolescence=False, |
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203 ) |
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204 |
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205 with ui.uninterruptible(): |
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206 try: |
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207 with repo.transaction(b"strip") as tr: |
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208 # TODO this code violates the interface abstraction of the |
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209 # transaction and makes assumptions that file storage is |
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210 # using append-only files. We'll need some kind of storage |
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211 # API to handle stripping for us. |
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212 oldfiles = set(tr._offsetmap.keys()) |
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213 oldfiles.update(tr._newfiles) |
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214 |
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215 tr.startgroup() |
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216 cl.strip(striprev, tr) |
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217 stripmanifest(repo, striprev, tr, files) |
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218 |
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219 for fn in files: |
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220 repo.file(fn).strip(striprev, tr) |
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221 tr.endgroup() |
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222 |
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223 entries = tr.readjournal() |
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224 |
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225 for file, troffset in entries: |
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226 if file in oldfiles: |
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227 continue |
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228 with repo.svfs(file, b'a', checkambig=True) as fp: |
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229 fp.truncate(troffset) |
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230 if troffset == 0: |
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231 repo.store.markremoved(file) |
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232 |
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233 deleteobsmarkers(repo.obsstore, stripobsidx) |
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234 del repo.obsstore |
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235 repo.invalidatevolatilesets() |
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236 repo._phasecache.filterunknown(repo) |
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237 |
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238 if tmpbundlefile: |
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239 ui.note(_(b"adding branch\n")) |
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240 f = vfs.open(tmpbundlefile, b"rb") |
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241 gen = exchange.readbundle(ui, f, tmpbundlefile, vfs) |
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242 if not repo.ui.verbose: |
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243 # silence internal shuffling chatter |
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244 repo.ui.pushbuffer() |
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245 tmpbundleurl = b'bundle:' + vfs.join(tmpbundlefile) |
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246 txnname = b'strip' |
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247 if not isinstance(gen, bundle2.unbundle20): |
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248 txnname = b"strip\n%s" % urlutil.hidepassword(tmpbundleurl) |
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249 with repo.transaction(txnname) as tr: |
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250 bundle2.applybundle( |
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251 repo, gen, tr, source=b'strip', url=tmpbundleurl |
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252 ) |
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253 if not repo.ui.verbose: |
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254 repo.ui.popbuffer() |
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255 f.close() |
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256 |
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257 with repo.transaction(b'repair') as tr: |
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258 bmchanges = [(m, repo[newbmtarget].node()) for m in updatebm] |
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259 repo._bookmarks.applychanges(repo, tr, bmchanges) |
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260 |
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261 # remove undo files |
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262 for undovfs, undofile in repo.undofiles(): |
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263 try: |
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264 undovfs.unlink(undofile) |
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265 except OSError as e: |
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266 if e.errno != errno.ENOENT: |
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267 ui.warn( |
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268 _(b'error removing %s: %s\n') |
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269 % ( |
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270 undovfs.join(undofile), |
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271 stringutil.forcebytestr(e), |
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272 ) |
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273 ) |
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274 |
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275 except: # re-raises |
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276 if backupfile: |
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277 ui.warn( |
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278 _(b"strip failed, backup bundle stored in '%s'\n") |
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279 % vfs.join(backupfile) |
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280 ) |
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281 if tmpbundlefile: |
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282 ui.warn( |
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283 _(b"strip failed, unrecovered changes stored in '%s'\n") |
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284 % vfs.join(tmpbundlefile) |
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285 ) |
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286 ui.warn( |
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287 _( |
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288 b"(fix the problem, then recover the changesets with " |
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289 b"\"hg unbundle '%s'\")\n" |
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290 ) |
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291 % vfs.join(tmpbundlefile) |
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292 ) |
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293 raise |
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294 else: |
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295 if tmpbundlefile: |
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296 # Remove temporary bundle only if there were no exceptions |
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297 vfs.unlink(tmpbundlefile) |
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298 |
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299 repo.destroyed() |
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300 # return the backup file path (or None if 'backup' was False) so |
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301 # extensions can use it |
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302 return backupfile |
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303 |
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304 |
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305 def softstrip(ui, repo, nodelist, backup=True, topic=b'backup'): |
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306 """perform a "soft" strip using the archived phase""" |
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307 tostrip = [c.node() for c in repo.set(b'sort(%ln::)', nodelist)] |
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308 if not tostrip: |
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309 return None |
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310 |
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311 backupfile = None |
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312 if backup: |
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313 node = tostrip[0] |
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314 backupfile = _createstripbackup(repo, tostrip, node, topic) |
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315 |
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316 newbmtarget, updatebm = _bookmarkmovements(repo, tostrip) |
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317 with repo.transaction(b'strip') as tr: |
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318 phases.retractboundary(repo, tr, phases.archived, tostrip) |
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319 bmchanges = [(m, repo[newbmtarget].node()) for m in updatebm] |
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320 repo._bookmarks.applychanges(repo, tr, bmchanges) |
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321 return backupfile |
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322 |
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323 |
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324 def _bookmarkmovements(repo, tostrip): |
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325 # compute necessary bookmark movement |
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326 bm = repo._bookmarks |
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327 updatebm = [] |
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328 for m in bm: |
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329 rev = repo[bm[m]].rev() |
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330 if rev in tostrip: |
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331 updatebm.append(m) |
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332 newbmtarget = None |
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333 # If we need to move bookmarks, compute bookmark |
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334 # targets. Otherwise we can skip doing this logic. |
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335 if updatebm: |
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336 # For a set s, max(parents(s) - s) is the same as max(heads(::s - s)), |
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337 # but is much faster |
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338 newbmtarget = repo.revs(b'max(parents(%ld) - (%ld))', tostrip, tostrip) |
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339 if newbmtarget: |
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340 newbmtarget = repo[newbmtarget.first()].node() |
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341 else: |
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342 newbmtarget = b'.' |
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343 return newbmtarget, updatebm |
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344 |
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345 |
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346 def _createstripbackup(repo, stripbases, node, topic): |
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347 # backup the changeset we are about to strip |
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348 vfs = repo.vfs |
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349 cl = repo.changelog |
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350 backupfile = backupbundle(repo, stripbases, cl.heads(), node, topic) |
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351 repo.ui.status(_(b"saved backup bundle to %s\n") % vfs.join(backupfile)) |
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352 repo.ui.log( |
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353 b"backupbundle", b"saved backup bundle to %s\n", vfs.join(backupfile) |
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354 ) |
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355 return backupfile |
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356 |
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357 |
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358 def safestriproots(ui, repo, nodes): |
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359 """return list of roots of nodes where descendants are covered by nodes""" |
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360 torev = repo.unfiltered().changelog.rev |
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361 revs = {torev(n) for n in nodes} |
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362 # tostrip = wanted - unsafe = wanted - ancestors(orphaned) |
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363 # orphaned = affected - wanted |
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364 # affected = descendants(roots(wanted)) |
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365 # wanted = revs |
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366 revset = b'%ld - ( ::( (roots(%ld):: and not _phase(%s)) -%ld) )' |
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367 tostrip = set(repo.revs(revset, revs, revs, phases.internal, revs)) |
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368 notstrip = revs - tostrip |
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369 if notstrip: |
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370 nodestr = b', '.join(sorted(short(repo[n].node()) for n in notstrip)) |
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371 ui.warn( |
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372 _(b'warning: orphaned descendants detected, not stripping %s\n') |
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373 % nodestr |
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374 ) |
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375 return [c.node() for c in repo.set(b'roots(%ld)', tostrip)] |
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376 |
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377 |
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378 class stripcallback(object): |
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379 """used as a transaction postclose callback""" |
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380 |
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381 def __init__(self, ui, repo, backup, topic): |
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382 self.ui = ui |
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383 self.repo = repo |
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384 self.backup = backup |
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385 self.topic = topic or b'backup' |
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386 self.nodelist = [] |
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387 |
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388 def addnodes(self, nodes): |
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389 self.nodelist.extend(nodes) |
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390 |
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391 def __call__(self, tr): |
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392 roots = safestriproots(self.ui, self.repo, self.nodelist) |
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393 if roots: |
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394 strip(self.ui, self.repo, roots, self.backup, self.topic) |
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395 |
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396 |
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397 def delayedstrip(ui, repo, nodelist, topic=None, backup=True): |
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398 """like strip, but works inside transaction and won't strip irreverent revs |
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399 |
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400 nodelist must explicitly contain all descendants. Otherwise a warning will |
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401 be printed that some nodes are not stripped. |
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402 |
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403 Will do a backup if `backup` is True. The last non-None "topic" will be |
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404 used as the backup topic name. The default backup topic name is "backup". |
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405 """ |
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406 tr = repo.currenttransaction() |
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407 if not tr: |
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408 nodes = safestriproots(ui, repo, nodelist) |
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409 return strip(ui, repo, nodes, backup=backup, topic=topic) |
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410 # transaction postclose callbacks are called in alphabet order. |
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411 # use '\xff' as prefix so we are likely to be called last. |
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412 callback = tr.getpostclose(b'\xffstrip') |
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413 if callback is None: |
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414 callback = stripcallback(ui, repo, backup=backup, topic=topic) |
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415 tr.addpostclose(b'\xffstrip', callback) |
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416 if topic: |
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417 callback.topic = topic |
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418 callback.addnodes(nodelist) |
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419 |
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420 |
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421 def stripmanifest(repo, striprev, tr, files): |
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422 for revlog in manifestrevlogs(repo): |
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423 revlog.strip(striprev, tr) |
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424 |
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425 |
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426 def manifestrevlogs(repo): |
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427 yield repo.manifestlog.getstorage(b'') |
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428 if scmutil.istreemanifest(repo): |
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429 # This logic is safe if treemanifest isn't enabled, but also |
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430 # pointless, so we skip it if treemanifest isn't enabled. |
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431 for t, unencoded, encoded, size in repo.store.datafiles(): |
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432 if unencoded.startswith(b'meta/') and unencoded.endswith( |
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433 b'00manifest.i' |
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434 ): |
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435 dir = unencoded[5:-12] |
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436 yield repo.manifestlog.getstorage(dir) |
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437 |
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438 |
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439 def rebuildfncache(ui, repo): |
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440 """Rebuilds the fncache file from repo history. |
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441 |
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442 Missing entries will be added. Extra entries will be removed. |
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443 """ |
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444 repo = repo.unfiltered() |
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445 |
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446 if requirements.FNCACHE_REQUIREMENT not in repo.requirements: |
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447 ui.warn( |
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448 _( |
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449 b'(not rebuilding fncache because repository does not ' |
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450 b'support fncache)\n' |
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451 ) |
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452 ) |
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453 return |
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454 |
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455 with repo.lock(): |
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|
456 fnc = repo.store.fncache |
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457 fnc.ensureloaded(warn=ui.warn) |
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458 |
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459 oldentries = set(fnc.entries) |
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460 newentries = set() |
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461 seenfiles = set() |
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462 |
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463 progress = ui.makeprogress( |
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464 _(b'rebuilding'), unit=_(b'changesets'), total=len(repo) |
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465 ) |
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466 for rev in repo: |
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467 progress.update(rev) |
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468 |
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469 ctx = repo[rev] |
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470 for f in ctx.files(): |
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471 # This is to minimize I/O. |
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472 if f in seenfiles: |
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473 continue |
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474 seenfiles.add(f) |
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475 |
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476 i = b'data/%s.i' % f |
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477 d = b'data/%s.d' % f |
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478 |
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479 if repo.store._exists(i): |
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480 newentries.add(i) |
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481 if repo.store._exists(d): |
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482 newentries.add(d) |
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483 |
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484 progress.complete() |
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485 |
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486 if requirements.TREEMANIFEST_REQUIREMENT in repo.requirements: |
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487 # This logic is safe if treemanifest isn't enabled, but also |
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488 # pointless, so we skip it if treemanifest isn't enabled. |
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489 for dir in pathutil.dirs(seenfiles): |
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490 i = b'meta/%s/00manifest.i' % dir |
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491 d = b'meta/%s/00manifest.d' % dir |
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492 |
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493 if repo.store._exists(i): |
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494 newentries.add(i) |
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495 if repo.store._exists(d): |
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496 newentries.add(d) |
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497 |
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498 addcount = len(newentries - oldentries) |
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499 removecount = len(oldentries - newentries) |
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500 for p in sorted(oldentries - newentries): |
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501 ui.write(_(b'removing %s\n') % p) |
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502 for p in sorted(newentries - oldentries): |
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503 ui.write(_(b'adding %s\n') % p) |
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504 |
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505 if addcount or removecount: |
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506 ui.write( |
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507 _(b'%d items added, %d removed from fncache\n') |
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508 % (addcount, removecount) |
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509 ) |
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510 fnc.entries = newentries |
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511 fnc._dirty = True |
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512 |
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513 with repo.transaction(b'fncache') as tr: |
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514 fnc.write(tr) |
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515 else: |
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516 ui.write(_(b'fncache already up to date\n')) |
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517 |
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518 |
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519 def deleteobsmarkers(obsstore, indices): |
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520 """Delete some obsmarkers from obsstore and return how many were deleted |
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521 |
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522 'indices' is a list of ints which are the indices |
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523 of the markers to be deleted. |
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524 |
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525 Every invocation of this function completely rewrites the obsstore file, |
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526 skipping the markers we want to be removed. The new temporary file is |
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527 created, remaining markers are written there and on .close() this file |
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528 gets atomically renamed to obsstore, thus guaranteeing consistency.""" |
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529 if not indices: |
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530 # we don't want to rewrite the obsstore with the same content |
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531 return |
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532 |
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533 left = [] |
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534 current = obsstore._all |
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535 n = 0 |
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536 for i, m in enumerate(current): |
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537 if i in indices: |
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538 n += 1 |
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539 continue |
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540 left.append(m) |
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541 |
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542 newobsstorefile = obsstore.svfs(b'obsstore', b'w', atomictemp=True) |
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543 for bytes in obsolete.encodemarkers(left, True, obsstore._version): |
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544 newobsstorefile.write(bytes) |
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545 newobsstorefile.close() |
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546 return n |