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annotate mercurial/helptext/evolution.txt @ 52032:09a54892b7ee

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mergestate: reduce the number of attribute lookups This code is called a lot during updates, this is a very small but also very easy thing to do.
author Raphaël Gomès <rgomes@octobus.net>
date Wed, 21 Aug 2024 09:48:14 +0200
parents da4e6d7a8fdd
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
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1 Obsolescence markers make it possible to mark changesets that have been
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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2 deleted or superseded in a new version of the changeset.
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3
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4 Unlike the previous way of handling such changes, by stripping the old
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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5 changesets from the repository, obsolescence markers can be propagated
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
Martin von Zweigbergk <martinvonz@google.com>
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6 between repositories. This allows for a safe and simple way of exchanging
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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7 mutable history and altering it after the fact. Changeset phases are
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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8 respected, such that only draft and secret changesets can be altered (see
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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9 :hg:`help phases` for details).
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10
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11 Obsolescence is tracked using "obsolescence markers", a piece of metadata
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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12 tracking which changesets have been made obsolete, potential successors for
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13 a given changeset, the moment the changeset was marked as obsolete, and the
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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14 user who performed the rewriting operation. The markers are stored
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15 separately from standard changeset data can be exchanged without any of the
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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16 precursor changesets, preventing unnecessary exchange of obsolescence data.
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17
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18 The complete set of obsolescence markers describes a history of changeset
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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19 modifications that is orthogonal to the repository history of file
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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20 modifications. This changeset history allows for detection and automatic
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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21 resolution of edge cases arising from multiple users rewriting the same part
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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22 of history concurrently.
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23
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24 Current feature status
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25 ======================
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26
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27 This feature is still in development.
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28
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29 Instability
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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30 ===========
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31
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32 Rewriting changesets might introduce instability.
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33
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34 There are two main kinds of instability: orphaning and diverging.
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35
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36 Orphans are changesets left behind when their ancestors are rewritten.
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37 Divergence has two variants:
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38
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39 * Content-divergence occurs when independent rewrites of the same changesets
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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40 lead to different results.
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41
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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42 * Phase-divergence occurs when the old (obsolete) version of a changeset
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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43 becomes public.
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44
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45 It is possible to prevent local creation of orphans by using the following config::
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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46
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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47 [experimental]
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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48 evolution.createmarkers = true
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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49 evolution.exchange = true
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50
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51 You can also enable that option explicitly::
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52
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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53 [experimental]
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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54 evolution.createmarkers = true
da4e6d7a8fdd help: add topic about evolution, based on text from evolve extension
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55 evolution.exchange = true
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56 evolution.allowunstable = true