Mercurial > hg
annotate hgext/split.py @ 50225:53ca3e3bc013 stable
rhg: fix race when a fixup file is deleted on disk
See next changeset for the other race in the same kind of logic and why
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author | Raphaël Gomès <rgomes@octobus.net> |
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date | Mon, 27 Feb 2023 15:18:50 +0100 |
parents | 6000f5b25c9b |
children | c166b212bdee |
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35455 | 1 # split.py - split a changeset into smaller ones |
2 # | |
3 # Copyright 2015 Laurent Charignon <lcharignon@fb.com> | |
4 # Copyright 2017 Facebook, Inc. | |
5 # | |
6 # This software may be used and distributed according to the terms of the | |
7 # GNU General Public License version 2 or any later version. | |
8 """command to split a changeset into smaller ones (EXPERIMENTAL)""" | |
9 | |
10 | |
11 from mercurial.i18n import _ | |
12 | |
13 from mercurial.node import ( | |
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14 nullrev, |
35455 | 15 short, |
16 ) | |
17 | |
18 from mercurial import ( | |
19 bookmarks, | |
20 cmdutil, | |
21 commands, | |
22 error, | |
23 hg, | |
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24 logcmdutil, |
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25 pycompat, |
35455 | 26 registrar, |
27 revsetlang, | |
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28 rewriteutil, |
35455 | 29 scmutil, |
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30 util, |
35455 | 31 ) |
32 | |
33 # allow people to use split without explicitly enabling rebase extension | |
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34 from . import rebase |
35455 | 35 |
36 cmdtable = {} | |
37 command = registrar.command(cmdtable) | |
38 | |
39 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for | |
40 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should | |
41 # be specifying the version(s) of Mercurial they are tested with, or | |
42 # leave the attribute unspecified. | |
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43 testedwith = b'ships-with-hg-core' |
35455 | 44 |
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45 |
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46 @command( |
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47 b'split', |
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48 [ |
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49 (b'r', b'rev', b'', _(b"revision to split"), _(b'REV')), |
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50 (b'', b'rebase', True, _(b'rebase descendants after split')), |
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51 ] |
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52 + cmdutil.commitopts2, |
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53 _(b'hg split [--no-rebase] [[-r] REV]'), |
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54 helpcategory=command.CATEGORY_CHANGE_MANAGEMENT, |
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55 helpbasic=True, |
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56 ) |
35455 | 57 def split(ui, repo, *revs, **opts): |
58 """split a changeset into smaller ones | |
59 | |
60 Repeatedly prompt changes and commit message for new changesets until there | |
61 is nothing left in the original changeset. | |
62 | |
63 If --rev was not given, split the working directory parent. | |
64 | |
65 By default, rebase connected non-obsoleted descendants onto the new | |
66 changeset. Use --no-rebase to avoid the rebase. | |
67 """ | |
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68 opts = pycompat.byteskwargs(opts) |
35455 | 69 revlist = [] |
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70 if opts.get(b'rev'): |
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71 revlist.append(opts.get(b'rev')) |
35455 | 72 revlist.extend(revs) |
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73 with repo.wlock(), repo.lock(): |
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74 tr = repo.transaction(b'split') |
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75 # If the rebase somehow runs into conflicts, make sure |
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76 # we close the transaction so the user can continue it. |
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77 with util.acceptintervention(tr): |
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78 revs = logcmdutil.revrange(repo, revlist or [b'.']) |
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79 if len(revs) > 1: |
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80 raise error.InputError(_(b'cannot split multiple revisions')) |
35455 | 81 |
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82 rev = revs.first() |
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83 # Handle nullrev specially here (instead of leaving for precheck() |
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84 # below) so we get a nicer message and error code. |
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85 if rev is None or rev == nullrev: |
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86 ui.status(_(b'nothing to split\n')) |
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87 return 1 |
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88 ctx = repo[rev] |
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89 if ctx.node() is None: |
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90 raise error.InputError(_(b'cannot split working directory')) |
35455 | 91 |
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92 if opts.get(b'rebase'): |
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93 # Skip obsoleted descendants and their descendants so the rebase |
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94 # won't cause conflicts for sure. |
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95 descendants = list(repo.revs(b'(%d::) - (%d)', rev, rev)) |
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96 torebase = list( |
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97 repo.revs( |
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98 b'%ld - (%ld & obsolete())::', descendants, descendants |
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99 ) |
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100 ) |
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101 else: |
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102 torebase = [] |
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103 rewriteutil.precheck(repo, [rev] + torebase, b'split') |
35455 | 104 |
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105 if len(ctx.parents()) > 1: |
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106 raise error.InputError(_(b'cannot split a merge changeset')) |
35455 | 107 |
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108 cmdutil.bailifchanged(repo) |
35455 | 109 |
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110 # Deactivate bookmark temporarily so it won't get moved |
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111 # unintentionally |
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112 bname = repo._activebookmark |
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113 if bname and repo._bookmarks[bname] != ctx.node(): |
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114 bookmarks.deactivate(repo) |
35455 | 115 |
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116 wnode = repo[b'.'].node() |
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117 top = None |
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118 try: |
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119 top = dosplit(ui, repo, tr, ctx, opts) |
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120 finally: |
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121 # top is None: split failed, need update --clean recovery. |
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122 # wnode == ctx.node(): wnode split, no need to update. |
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123 if top is None or wnode != ctx.node(): |
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124 hg.clean(repo, wnode, show_stats=False) |
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125 if bname: |
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126 bookmarks.activate(repo, bname) |
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127 if torebase and top: |
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128 dorebase(ui, repo, torebase, top) |
35455 | 129 |
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130 |
35455 | 131 def dosplit(ui, repo, tr, ctx, opts): |
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132 committed = [] # [ctx] |
35455 | 133 |
134 # Set working parent to ctx.p1(), and keep working copy as ctx's content | |
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135 if ctx.node() != repo.dirstate.p1(): |
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136 hg.clean(repo, ctx.node(), show_stats=False) |
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137 with repo.dirstate.parentchange(): |
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138 scmutil.movedirstate(repo, ctx.p1()) |
35455 | 139 |
140 # Any modified, added, removed, deleted result means split is incomplete | |
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141 def incomplete(repo): |
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142 st = repo.status() |
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143 return any((st.modified, st.added, st.removed, st.deleted)) |
35455 | 144 |
145 # Main split loop | |
146 while incomplete(repo): | |
147 if committed: | |
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148 header = _( |
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149 b'HG: Splitting %s. So far it has been split into:\n' |
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150 ) % short(ctx.node()) |
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151 # We don't want color codes in the commit message template, so |
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152 # disable the label() template function while we render it. |
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153 with ui.configoverride( |
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154 {(b'templatealias', b'label(l,x)'): b"x"}, b'split' |
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155 ): |
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156 for c in committed: |
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157 summary = cmdutil.format_changeset_summary(ui, c, b'split') |
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158 header += _(b'HG: - %s\n') % summary |
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159 header += _( |
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160 b'HG: Write commit message for the next split changeset.\n' |
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161 ) |
35455 | 162 else: |
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163 header = _( |
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164 b'HG: Splitting %s. Write commit message for the ' |
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165 b'first split changeset.\n' |
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166 ) % short(ctx.node()) |
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167 opts.update( |
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168 { |
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169 b'edit': True, |
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170 b'interactive': True, |
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171 b'message': header + ctx.description(), |
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172 } |
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173 ) |
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174 origctx = repo[b'.'] |
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175 commands.commit(ui, repo, **pycompat.strkwargs(opts)) |
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176 newctx = repo[b'.'] |
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177 # Ensure user didn't do a "no-op" split (such as deselecting |
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178 # everything). |
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179 if origctx.node() != newctx.node(): |
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180 committed.append(newctx) |
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182 if not committed: | |
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183 raise error.InputError(_(b'cannot split an empty revision')) |
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185 if len(committed) != 1 or committed[0].node() != ctx.node(): |
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186 # Ensure we don't strip a node if we produce the same commit as already |
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187 # exists |
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188 scmutil.cleanupnodes( |
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189 repo, |
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190 {ctx.node(): [c.node() for c in committed]}, |
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191 operation=b'split', |
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192 fixphase=True, |
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193 ) |
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195 return committed[-1] | |
196 | |
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197 |
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198 def dorebase(ui, repo, src, destctx): |
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199 rebase.rebase( |
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200 ui, |
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201 repo, |
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202 rev=[revsetlang.formatspec(b'%ld', src)], |
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203 dest=revsetlang.formatspec(b'%d', destctx.rev()), |
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204 ) |