annotate hgext/share.py @ 25881:9de443515f1d stable

help: scripting help topic There are a lot of non-human consumers of Mercurial. And the challenges and considerations for machines consuming Mercurial is significantly different from what humans face. I think there are enough special considerations around how machines consume Mercurial that a dedicated help topic is warranted. I concede the audience for this topic is probably small compared to the general audience. However, lots of normal Mercurial users do things like create one-off shell scripts for common workflows that I think this is useful enough to be in the install (as opposed to, say, a wiki page - which most users will likely never find). This text is by no means perfect. But you have to start somewhere. I think I did cover the important parts, though.
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 18 Jul 2015 17:10:28 -0700
parents bf3d10f0c34a
children 56b2bcea2529
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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
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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 Automatic Pooled Storage for Clones
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9 -----------------------------------
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10
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11 When this extension is active, :hg:`clone` can be configured to
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12 automatically share/pool storage across multiple clones. This
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13 mode effectively converts :hg:`clone` to :hg:`clone` + :hg:`share`.
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14 The benefit of using this mode is the automatic management of
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15 store paths and intelligent pooling of related repositories.
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16
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17 The following ``share.`` config options influence this feature:
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18
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19 ``share.pool``
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20 Filesystem path where shared repository data will be stored. When
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21 defined, :hg:`clone` will automatically use shared repository
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22 storage instead of creating a store inside each clone.
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23
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24 ``share.poolnaming``
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25 How directory names in ``share.pool`` are constructed.
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26
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27 "identity" means the name is derived from the first changeset in the
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28 repository. In this mode, different remotes share storage if their
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29 root/initial changeset is identical. In this mode, the local shared
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30 repository is an aggregate of all encountered remote repositories.
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31
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32 "remote" means the name is derived from the source repository's
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33 path or URL. In this mode, storage is only shared if the path or URL
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34 requested in the :hg:`clone` command matches exactly to a repository
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35 that was cloned before.
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36
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37 The default naming mode is "identity."
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38 '''
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39
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40 from mercurial.i18n import _
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41 from mercurial import cmdutil, commands, hg, util, extensions, bookmarks
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42 from mercurial.hg import repository, parseurl
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43 import errno
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44
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45 cmdtable = {}
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46 command = cmdutil.command(cmdtable)
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47 # Note for extension authors: ONLY specify testedwith = 'internal' for
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48 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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49 # be specifying the version(s) of Mercurial they are tested with, or
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50 # leave the attribute unspecified.
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51 testedwith = 'internal'
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52
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53 @command('share',
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54 [('U', 'noupdate', None, _('do not create a working directory')),
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55 ('B', 'bookmarks', None, _('also share bookmarks'))],
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56 _('[-U] [-B] SOURCE [DEST]'),
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57 norepo=True)
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58 def share(ui, source, dest=None, noupdate=False, bookmarks=False):
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59 """create a new shared repository
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60
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61 Initialize a new repository and working directory that shares its
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62 history (and optionally bookmarks) with another repository.
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63
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64 .. note::
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65
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66 using rollback or extensions that destroy/modify history (mq,
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67 rebase, etc.) can cause considerable confusion with shared
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68 clones. In particular, if two shared clones are both updated to
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69 the same changeset, and one of them destroys that changeset
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70 with rollback, the other clone will suddenly stop working: all
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71 operations will fail with "abort: working directory has unknown
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72 parent". The only known workaround is to use debugsetparents on
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73 the broken clone to reset it to a changeset that still exists.
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74 """
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75
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76 return hg.share(ui, source, dest, not noupdate, bookmarks)
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77
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78 @command('unshare', [], '')
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79 def unshare(ui, repo):
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80 """convert a shared repository to a normal one
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81
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82 Copy the store data to the repo and remove the sharedpath data.
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83 """
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84
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85 if not repo.shared():
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86 raise util.Abort(_("this is not a shared repo"))
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87
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88 destlock = lock = None
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89 lock = repo.lock()
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90 try:
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91 # we use locks here because if we race with commit, we
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92 # can end up with extra data in the cloned revlogs that's
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93 # not pointed to by changesets, thus causing verify to
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94 # fail
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95
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96 destlock = hg.copystore(ui, repo, repo.path)
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97
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98 sharefile = repo.join('sharedpath')
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99 util.rename(sharefile, sharefile + '.old')
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100
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101 repo.requirements.discard('sharedpath')
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102 repo._writerequirements()
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103 finally:
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104 destlock and destlock.release()
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105 lock and lock.release()
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106
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107 # update store, spath, svfs and sjoin of repo
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108 repo.unfiltered().__init__(repo.baseui, repo.root)
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109
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110 # Wrap clone command to pass auto share options.
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111 def clone(orig, ui, source, *args, **opts):
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112 pool = ui.config('share', 'pool', None)
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113 if pool:
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114 pool = util.expandpath(pool)
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115
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116 opts['shareopts'] = dict(
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117 pool=pool,
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118 mode=ui.config('share', 'poolnaming', 'identity'),
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119 )
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120
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121 return orig(ui, source, *args, **opts)
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122
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123 def extsetup(ui):
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124 extensions.wrapfunction(bookmarks.bmstore, 'getbkfile', getbkfile)
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125 extensions.wrapfunction(bookmarks.bmstore, 'recordchange', recordchange)
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126 extensions.wrapfunction(bookmarks.bmstore, 'write', write)
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127 extensions.wrapcommand(commands.table, 'clone', clone)
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128
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129 def _hassharedbookmarks(repo):
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130 """Returns whether this repo has shared bookmarks"""
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131 try:
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132 shared = repo.vfs.read('shared').splitlines()
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133 except IOError as inst:
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134 if inst.errno != errno.ENOENT:
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135 raise
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136 return False
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137 return 'bookmarks' in shared
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138
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139 def _getsrcrepo(repo):
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140 """
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141 Returns the source repository object for a given shared repository.
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142 If repo is not a shared repository, return None.
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143 """
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144 if repo.sharedpath == repo.path:
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145 return None
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146
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147 # the sharedpath always ends in the .hg; we want the path to the repo
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148 source = repo.vfs.split(repo.sharedpath)[0]
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149 srcurl, branches = parseurl(source)
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150 return repository(repo.ui, srcurl)
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151
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152 def getbkfile(orig, self, repo):
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153 if _hassharedbookmarks(repo):
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154 srcrepo = _getsrcrepo(repo)
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155 if srcrepo is not None:
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156 repo = srcrepo
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157 return orig(self, repo)
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158
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159 def recordchange(orig, self, tr):
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160 # Continue with write to local bookmarks file as usual
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161 orig(self, tr)
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162
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163 if _hassharedbookmarks(self._repo):
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164 srcrepo = _getsrcrepo(self._repo)
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165 if srcrepo is not None:
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166 category = 'share-bookmarks'
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167 tr.addpostclose(category, lambda tr: self._writerepo(srcrepo))
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168
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169 def write(orig, self):
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170 # First write local bookmarks file in case we ever unshare
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171 orig(self)
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172 if _hassharedbookmarks(self._repo):
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173 srcrepo = _getsrcrepo(self._repo)
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174 if srcrepo is not None:
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175 self._writerepo(srcrepo)