Mercurial > hg
annotate hgext/share.py @ 46192:25d11b24dedf
upgrade: move printing of unused optimizations to UpgradeOperation class
Differential Revision: https://phab.mercurial-scm.org/D9578
author | Pulkit Goyal <7895pulkit@gmail.com> |
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date | Mon, 14 Dec 2020 13:48:25 +0530 |
parents | c80f9e3daec3 |
children | d4ba4d51f85f |
rev | line source |
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1 # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> |
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2 # |
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3 # This software may be used and distributed according to the terms of the |
10263 | 4 # GNU General Public License version 2 or any later version. |
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5 |
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6 '''share a common history between several working directories |
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7 |
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8 The share extension introduces a new command :hg:`share` to create a new |
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9 working directory. This is similar to :hg:`clone`, but doesn't involve |
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10 copying or linking the storage of the repository. This allows working on |
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11 different branches or changes in parallel without the associated cost in |
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12 terms of disk space. |
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13 |
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14 Note: destructive operations or extensions like :hg:`rollback` should be |
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15 used with care as they can result in confusing problems. |
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16 |
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17 Automatic Pooled Storage for Clones |
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18 ----------------------------------- |
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19 |
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20 When this extension is active, :hg:`clone` can be configured to |
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21 automatically share/pool storage across multiple clones. This |
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22 mode effectively converts :hg:`clone` to :hg:`clone` + :hg:`share`. |
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23 The benefit of using this mode is the automatic management of |
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24 store paths and intelligent pooling of related repositories. |
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25 |
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26 The following ``share.`` config options influence this feature: |
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27 |
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28 ``share.pool`` |
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29 Filesystem path where shared repository data will be stored. When |
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30 defined, :hg:`clone` will automatically use shared repository |
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31 storage instead of creating a store inside each clone. |
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32 |
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33 ``share.poolnaming`` |
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34 How directory names in ``share.pool`` are constructed. |
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35 |
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36 "identity" means the name is derived from the first changeset in the |
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37 repository. In this mode, different remotes share storage if their |
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38 root/initial changeset is identical. In this mode, the local shared |
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39 repository is an aggregate of all encountered remote repositories. |
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40 |
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41 "remote" means the name is derived from the source repository's |
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42 path or URL. In this mode, storage is only shared if the path or URL |
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43 requested in the :hg:`clone` command matches exactly to a repository |
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44 that was cloned before. |
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45 |
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46 The default naming mode is "identity". |
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47 |
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48 .. container:: verbose |
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49 |
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50 Sharing requirements and configs of source repository with shares: |
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51 |
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52 By default creating a shared repository only enables sharing a common |
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53 history and does not share requirements and configs between them. This |
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54 may lead to problems in some cases, for example when you upgrade the |
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55 storage format from one repository but does not set related configs |
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56 in the shares. |
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57 |
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58 Setting `format.exp-share-safe = True` enables sharing configs and |
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59 requirements. This only applies to shares which are done after enabling |
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60 the config option. |
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61 |
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62 For enabling this in existing shares, enable the config option and reshare. |
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63 |
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64 For resharing existing shares, make sure your working directory is clean |
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65 and there are no untracked files, delete that share and create a new share. |
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66 ''' |
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67 |
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68 from __future__ import absolute_import |
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69 |
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70 import errno |
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71 from mercurial.i18n import _ |
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72 from mercurial import ( |
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73 bookmarks, |
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74 commands, |
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75 error, |
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76 extensions, |
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77 hg, |
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78 registrar, |
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79 txnutil, |
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80 util, |
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81 ) |
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82 |
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83 cmdtable = {} |
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84 command = registrar.command(cmdtable) |
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85 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for |
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86 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should |
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87 # be specifying the version(s) of Mercurial they are tested with, or |
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88 # leave the attribute unspecified. |
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89 testedwith = b'ships-with-hg-core' |
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90 |
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91 |
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92 @command( |
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93 b'share', |
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94 [ |
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95 (b'U', b'noupdate', None, _(b'do not create a working directory')), |
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96 (b'B', b'bookmarks', None, _(b'also share bookmarks')), |
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97 ( |
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98 b'', |
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99 b'relative', |
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100 None, |
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101 _(b'point to source using a relative path'), |
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102 ), |
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103 ], |
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104 _(b'[-U] [-B] SOURCE [DEST]'), |
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105 helpcategory=command.CATEGORY_REPO_CREATION, |
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106 norepo=True, |
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107 ) |
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108 def share( |
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109 ui, source, dest=None, noupdate=False, bookmarks=False, relative=False |
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110 ): |
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111 """create a new shared repository |
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112 |
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113 Initialize a new repository and working directory that shares its |
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114 history (and optionally bookmarks) with another repository. |
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115 |
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117 |
12389 | 118 using rollback or extensions that destroy/modify history (mq, |
119 rebase, etc.) can cause considerable confusion with shared | |
120 clones. In particular, if two shared clones are both updated to | |
121 the same changeset, and one of them destroys that changeset | |
122 with rollback, the other clone will suddenly stop working: all | |
123 operations will fail with "abort: working directory has unknown | |
124 parent". The only known workaround is to use debugsetparents on | |
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125 the broken clone to reset it to a changeset that still exists. |
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126 """ |
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127 |
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128 hg.share( |
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129 ui, |
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130 source, |
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131 dest=dest, |
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132 update=not noupdate, |
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133 bookmarks=bookmarks, |
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134 relative=relative, |
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135 ) |
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136 return 0 |
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137 |
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138 |
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139 @command(b'unshare', [], b'', helpcategory=command.CATEGORY_MAINTENANCE) |
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140 def unshare(ui, repo): |
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141 """convert a shared repository to a normal one |
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142 |
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143 Copy the store data to the repo and remove the sharedpath data. |
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144 """ |
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145 |
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146 if not repo.shared(): |
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147 raise error.Abort(_(b"this is not a shared repo")) |
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148 |
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149 hg.unshare(ui, repo) |
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150 |
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151 |
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152 # Wrap clone command to pass auto share options. |
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153 def clone(orig, ui, source, *args, **opts): |
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154 pool = ui.config(b'share', b'pool') |
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155 if pool: |
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156 pool = util.expandpath(pool) |
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157 |
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158 opts['shareopts'] = { |
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159 b'pool': pool, |
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160 b'mode': ui.config(b'share', b'poolnaming'), |
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161 } |
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162 |
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163 return orig(ui, source, *args, **opts) |
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164 |
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165 |
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166 def extsetup(ui): |
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167 extensions.wrapfunction(bookmarks, b'_getbkfile', getbkfile) |
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168 extensions.wrapfunction(bookmarks.bmstore, b'_recordchange', recordchange) |
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169 extensions.wrapfunction(bookmarks.bmstore, b'_writerepo', writerepo) |
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170 extensions.wrapcommand(commands.table, b'clone', clone) |
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171 |
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172 |
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173 def _hassharedbookmarks(repo): |
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174 """Returns whether this repo has shared bookmarks""" |
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175 if bookmarks.bookmarksinstore(repo): |
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176 # Kind of a lie, but it means that we skip our custom reads and writes |
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177 # from/to the source repo. |
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178 return False |
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179 try: |
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180 shared = repo.vfs.read(b'shared').splitlines() |
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181 except IOError as inst: |
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182 if inst.errno != errno.ENOENT: |
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183 raise |
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184 return False |
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185 return hg.sharedbookmarks in shared |
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186 |
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187 |
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188 def getbkfile(orig, repo): |
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189 if _hassharedbookmarks(repo): |
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190 srcrepo = hg.sharedreposource(repo) |
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191 if srcrepo is not None: |
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192 # just orig(srcrepo) doesn't work as expected, because |
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193 # HG_PENDING refers repo.root. |
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194 try: |
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195 fp, pending = txnutil.trypending( |
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196 repo.root, repo.vfs, b'bookmarks' |
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197 ) |
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198 if pending: |
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199 # only in this case, bookmark information in repo |
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200 # is up-to-date. |
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201 return fp |
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202 fp.close() |
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203 except IOError as inst: |
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204 if inst.errno != errno.ENOENT: |
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205 raise |
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206 |
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207 # otherwise, we should read bookmarks from srcrepo, |
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208 # because .hg/bookmarks in srcrepo might be already |
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209 # changed via another sharing repo |
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210 repo = srcrepo |
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211 |
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212 # TODO: Pending changes in repo are still invisible in |
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213 # srcrepo, because bookmarks.pending is written only into repo. |
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214 # See also https://www.mercurial-scm.org/wiki/SharedRepository |
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215 return orig(repo) |
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216 |
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217 |
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218 def recordchange(orig, self, tr): |
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219 # Continue with write to local bookmarks file as usual |
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220 orig(self, tr) |
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221 |
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222 if _hassharedbookmarks(self._repo): |
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223 srcrepo = hg.sharedreposource(self._repo) |
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224 if srcrepo is not None: |
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225 category = b'share-bookmarks' |
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226 tr.addpostclose(category, lambda tr: self._writerepo(srcrepo)) |
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227 |
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228 |
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229 def writerepo(orig, self, repo): |
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230 # First write local bookmarks file in case we ever unshare |
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231 orig(self, repo) |
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232 |
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233 if _hassharedbookmarks(self._repo): |
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234 srcrepo = hg.sharedreposource(self._repo) |
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235 if srcrepo is not None: |
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236 orig(self, srcrepo) |