annotate mercurial/rewriteutil.py @ 47387:75e1104f23a2

revlog: use dedicated code for reading sidedata We are about to introduce a new, dedicated, file to store sidedata. Before doing so, we make sidedata reading go through different code as reading data chunk. This will simplify some of the complexity of the next changesets. The reading is very simple right now and will need some improvement later to reuse some of the caching strategy we use for the data file. Differential Revision: https://phab.mercurial-scm.org/D10785
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Thu, 27 May 2021 04:09:30 +0200
parents 8125bcd28a5c
children debc29900b97
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1 # rewriteutil.py - utility functions for rewriting changesets
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2 #
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3 # Copyright 2017 Octobus <contact@octobus.net>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import re
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11
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12 from .i18n import _
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13 from .node import (
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14 hex,
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15 nullrev,
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16 )
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17
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18 from . import (
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19 error,
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20 node,
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21 obsolete,
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22 obsutil,
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23 revset,
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24 scmutil,
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25 util,
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26 )
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27
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28
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29 NODE_RE = re.compile(br'\b[0-9a-f]{6,64}\b')
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30
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31
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32 def _formatrevs(repo, revs, maxrevs=4):
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33 """returns a string summarizing revisions in a decent size
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34
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35 If there are few enough revisions, we list them all. Otherwise we display a
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36 summary of the form:
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37
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38 1ea73414a91b and 5 others
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39 """
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40 tonode = repo.changelog.node
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41 numrevs = len(revs)
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42 if numrevs < maxrevs:
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43 shorts = [node.short(tonode(r)) for r in revs]
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44 summary = b', '.join(shorts)
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45 else:
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46 first = revs.first()
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47 summary = _(b'%s and %d others')
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48 summary %= (node.short(tonode(first)), numrevs - 1)
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49 return summary
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50
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51
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52 def precheck(repo, revs, action=b'rewrite'):
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53 """check if revs can be rewritten
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54 action is used to control the error message.
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55
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56 Make sure this function is called after taking the lock.
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57 """
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58 if nullrev in revs:
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59 msg = _(b"cannot %s the null revision") % action
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60 hint = _(b"no changeset checked out")
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61 raise error.InputError(msg, hint=hint)
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62
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63 if any(util.safehasattr(r, 'rev') for r in revs):
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64 repo.ui.develwarn(b"rewriteutil.precheck called with ctx not revs")
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65 revs = (r.rev() for r in revs)
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66
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67 if len(repo[None].parents()) > 1:
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68 raise error.StateError(
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69 _(b"cannot %s changesets while merging") % action
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70 )
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71
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72 publicrevs = repo.revs(b'%ld and public()', revs)
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73 if publicrevs:
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74 summary = _formatrevs(repo, publicrevs)
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75 msg = _(b"cannot %s public changesets: %s") % (action, summary)
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76 hint = _(b"see 'hg help phases' for details")
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77 raise error.InputError(msg, hint=hint)
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78
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79 newunstable = disallowednewunstable(repo, revs)
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80 if newunstable:
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81 hint = _(b"see 'hg help evolution.instability'")
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82 raise error.InputError(
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83 _(b"cannot %s changeset, as that will orphan %d descendants")
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84 % (action, len(newunstable)),
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85 hint=hint,
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86 )
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87
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88 if not obsolete.isenabled(repo, obsolete.allowdivergenceopt):
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89 new_divergence = _find_new_divergence(repo, revs)
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90 if new_divergence:
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91 local_ctx, other_ctx, base_ctx = new_divergence
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92 msg = _(
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93 b'cannot %s %s, as that creates content-divergence with %s'
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94 ) % (
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95 action,
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96 local_ctx,
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97 other_ctx,
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98 )
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99 if local_ctx.rev() != base_ctx.rev():
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100 msg += _(b', from %s') % base_ctx
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101 if repo.ui.verbose:
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102 if local_ctx.rev() != base_ctx.rev():
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103 msg += _(
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104 b'\n changeset %s is a successor of ' b'changeset %s'
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105 ) % (local_ctx, base_ctx)
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106 msg += _(
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107 b'\n changeset %s already has a successor in '
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108 b'changeset %s\n'
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109 b' rewriting changeset %s would create '
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110 b'"content-divergence"\n'
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111 b' set experimental.evolution.allowdivergence=True to '
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112 b'skip this check'
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113 ) % (base_ctx, other_ctx, local_ctx)
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114 raise error.InputError(
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115 msg,
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116 hint=_(
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117 b"see 'hg help evolution.instability' for details on content-divergence"
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118 ),
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119 )
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120 else:
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121 raise error.InputError(
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122 msg,
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123 hint=_(
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124 b"add --verbose for details or see "
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125 b"'hg help evolution.instability'"
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126 ),
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127 )
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128
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129
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130 def disallowednewunstable(repo, revs):
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131 """Checks whether editing the revs will create new unstable changesets and
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132 are we allowed to create them.
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133
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134 To allow new unstable changesets, set the config:
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135 `experimental.evolution.allowunstable=True`
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136 """
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137 allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
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138 if allowunstable:
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139 return revset.baseset()
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140 return repo.revs(b"(%ld::) - %ld", revs, revs)
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141
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142
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143 def _find_new_divergence(repo, revs):
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144 obsrevs = repo.revs(b'%ld and obsolete()', revs)
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145 for r in obsrevs:
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146 div = find_new_divergence_from(repo, repo[r])
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147 if div:
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148 return (repo[r], repo[div[0]], repo[div[1]])
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149 return None
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150
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151
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152 def find_new_divergence_from(repo, ctx):
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153 """return divergent revision if rewriting an obsolete cset (ctx) will
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154 create divergence
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155
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156 Returns (<other node>, <common ancestor node>) or None
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157 """
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158 if not ctx.obsolete():
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159 return None
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160 # We need to check two cases that can cause divergence:
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161 # case 1: the rev being rewritten has a non-obsolete successor (easily
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162 # detected by successorssets)
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163 sset = obsutil.successorssets(repo, ctx.node())
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164 if sset:
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165 return (sset[0][0], ctx.node())
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166 else:
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167 # case 2: one of the precursors of the rev being revived has a
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168 # non-obsolete successor (we need divergentsets for this)
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169 divsets = obsutil.divergentsets(repo, ctx)
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170 if divsets:
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171 nsuccset = divsets[0][b'divergentnodes']
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172 prec = divsets[0][b'commonpredecessor']
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173 return (nsuccset[0], prec)
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174 return None
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175
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176
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177 def skip_empty_successor(ui, command):
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178 empty_successor = ui.config(b'rewrite', b'empty-successor')
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179 if empty_successor == b'skip':
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180 return True
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181 elif empty_successor == b'keep':
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182 return False
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183 else:
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184 raise error.ConfigError(
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185 _(
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186 b"%s doesn't know how to handle config "
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187 b"rewrite.empty-successor=%s (only 'skip' and 'keep' are "
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188 b"supported)"
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189 )
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190 % (command, empty_successor)
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191 )
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192
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193
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194 def update_hash_refs(repo, commitmsg, pending=None):
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195 """Replace all obsolete commit hashes in the message with the current hash.
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196
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197 If the obsolete commit was split or is divergent, the hash is not replaced
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198 as there's no way to know which successor to choose.
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199
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200 For commands that update a series of commits in the current transaction, the
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201 new obsolete markers can be considered by setting ``pending`` to a mapping
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202 of ``pending[oldnode] = [successor_node1, successor_node2,..]``.
45424
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203 """
45425
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204 if not pending:
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205 pending = {}
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206 cache = {}
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207 hashes = re.findall(NODE_RE, commitmsg)
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208 unfi = repo.unfiltered()
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209 for h in hashes:
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210 fullnode = scmutil.resolvehexnodeidprefix(unfi, h)
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211 if fullnode is None:
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212 continue
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213 ctx = unfi[fullnode]
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214 if not ctx.obsolete():
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215 successors = pending.get(fullnode)
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216 if successors is None:
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diff changeset
217 continue
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218 # obsutil.successorssets() returns a list of list of nodes
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219 successors = [successors]
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220 else:
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221 successors = obsutil.successorssets(repo, ctx.node(), cache=cache)
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222
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223 # We can't make any assumptions about how to update the hash if the
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224 # cset in question was split or diverged.
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225 if len(successors) == 1 and len(successors[0]) == 1:
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226 successor = successors[0][0]
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227 if successor is not None:
46113
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228 newhash = hex(successor)
45711
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229 commitmsg = commitmsg.replace(h, newhash[: len(h)])
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230 else:
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diff changeset
231 repo.ui.note(
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diff changeset
232 _(
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233 b'The stale commit message reference to %s could '
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diff changeset
234 b'not be updated\n(The referenced commit was dropped)\n'
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diff changeset
235 )
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diff changeset
236 % h
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diff changeset
237 )
45424
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diff changeset
238 else:
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diff changeset
239 repo.ui.note(
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diff changeset
240 _(
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diff changeset
241 b'The stale commit message reference to %s could '
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diff changeset
242 b'not be updated\n'
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diff changeset
243 )
45427
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diff changeset
244 % h
45424
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diff changeset
245 )
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diff changeset
246
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diff changeset
247 return commitmsg