forked from mirrors/jj
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28 KiB
HTML
1276 lines
No EOL
28 KiB
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<title>Conflicts - Jujutsu docs</title>
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<header class="md-header md-header--shadow" data-md-component="header">
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Jujutsu docs
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<span class="md-ellipsis">
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Conflicts
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<form class="md-search__form" name="search">
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<input type="text" class="md-search__input" name="query" aria-label="Search" placeholder="Search" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="search-query" required>
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<div class="md-search-result" data-md-component="search-result">
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<div class="md-search-result__meta">
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Initializing search
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<ol class="md-search-result__list" role="presentation"></ol>
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Getting started
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Getting started
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<a href="../install-and-setup/" class="md-nav__link">
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<span class="md-ellipsis">
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Installation and Setup
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</a>
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<a href="../tutorial/" class="md-nav__link">
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Tutorial and Birds-Eye View
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</a>
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Working with GitHub
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</a>
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</ul>
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</nav>
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<li class="md-nav__item">
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<a href="../FAQ/" class="md-nav__link">
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FAQ
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</a>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<label class="md-nav__link" for="__nav_4" id="__nav_4_label" tabindex="0">
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<span class="md-ellipsis">
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Concepts
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_4_label" aria-expanded="true">
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<label class="md-nav__title" for="__nav_4">
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<span class="md-nav__icon md-icon"></span>
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Concepts
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../working-copy/" class="md-nav__link">
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<span class="md-ellipsis">
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Working Copy
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../branches/" class="md-nav__link">
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<span class="md-ellipsis">
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Branches
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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<span class="md-ellipsis">
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Conflicts
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<a href="./" class="md-nav__link md-nav__link--active">
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<span class="md-ellipsis">
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Conflicts
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</span>
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</a>
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#introduction" class="md-nav__link">
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Introduction
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#advantages" class="md-nav__link">
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Advantages
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#conflict-markers" class="md-nav__link">
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Conflict markers
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="../operation-log/" class="md-nav__link">
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<span class="md-ellipsis">
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Operation Log
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../glossary/" class="md-nav__link">
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<span class="md-ellipsis">
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Glossary
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_5" >
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<label class="md-nav__link" for="__nav_5" id="__nav_5_label" tabindex="0">
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<span class="md-ellipsis">
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Configuration
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false">
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<label class="md-nav__title" for="__nav_5">
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<span class="md-nav__icon md-icon"></span>
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Configuration
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../config/" class="md-nav__link">
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<span class="md-ellipsis">
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Settings
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../revsets/" class="md-nav__link">
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<span class="md-ellipsis">
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Revset language
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../templates/" class="md-nav__link">
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<span class="md-ellipsis">
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Templating language
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</span>
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</a>
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</li>
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</ul>
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</nav>
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<h1 id="first-class-conflicts">First-class conflicts<a class="headerlink" href="#first-class-conflicts" title="Permanent link">¶</a></h1>
|
|
<h2 id="introduction">Introduction<a class="headerlink" href="#introduction" title="Permanent link">¶</a></h2>
|
|
<p>Like <a href="https://pijul.org/">Pijul</a> and <a href="http://darcs.net/">Darcs</a> but unlike most
|
|
other VCSs, Jujutsu can record conflicted states in commits. For example, if you
|
|
rebase a commit and it results in a conflict, the conflict will be recorded in
|
|
the rebased commit and the rebase operation will succeed. You can then resolve
|
|
the conflict whenever you want. Conflicted states can be further rebased,
|
|
merged, or backed out. Note that what's stored in the commit is a logical
|
|
representation of the conflict, not conflict <em>markers</em>; rebasing a conflict
|
|
doesn't result in a nested conflict markers (see
|
|
<a href="../technical/conflicts/">technical doc</a> for how this works).</p>
|
|
<h2 id="advantages">Advantages<a class="headerlink" href="#advantages" title="Permanent link">¶</a></h2>
|
|
<p>The deeper understanding of conflicts has many advantages:</p>
|
|
<ul>
|
|
<li>Removes the need for things like
|
|
<code>git rebase/merge/cherry-pick/etc --continue</code>. Instead, you get a single
|
|
workflow for resolving conflicts: check out the conflicted commit, resolve
|
|
conflicts, and amend.</li>
|
|
<li>Enables the "auto-rebase" feature, where descendants of rewritten commits
|
|
automatically get rewritten. This feature mostly replaces Mercurial's
|
|
<a href="https://www.mercurial-scm.org/wiki/ChangesetEvolution">Changeset Evolution</a>.</li>
|
|
<li>Lets us define the change in a merge commit as being compared to the merged
|
|
parents. That way, we can rebase merge commits correctly (unlike both Git and
|
|
Mercurial). That includes conflict resolutions done in the merge commit,
|
|
addressing a common use case for
|
|
<a href="https://git-scm.com/docs/git-rerere">git rerere</a>.
|
|
Since the changes in a merge commit are displayed and rebased as expected,
|
|
<a href="https://git-scm.com/docs/gitglossary/2.22.0#Documentation/gitglossary.txt-aiddefevilmergeaevilmerge">evil merges</a>
|
|
are arguably not as evil anymore.</li>
|
|
<li>Allows you to postpone conflict resolution until you're ready for it. You
|
|
can easily keep all your work-in-progress commits rebased onto upstream's head
|
|
if you like.</li>
|
|
<li><a href="https://stackoverflow.com/questions/26370185/how-do-criss-cross-merges-arise-in-git">Criss-cross merges</a>
|
|
and <a href="https://git-scm.com/docs/git-merge#Documentation/git-merge.txt-octopus">octopus merges</a>
|
|
become trivial (implementation-wise); some cases that Git can't currently
|
|
handle, or that would result in nested conflict markers, can be automatically
|
|
resolved.</li>
|
|
<li>Enables collaborative conflict resolution. (This assumes that you can share
|
|
the conflicts with others, which you probably shouldn't do if some people
|
|
interact with your project using Git.)</li>
|
|
</ul>
|
|
<p>For information about how conflicts are handled in the working copy, see
|
|
<a href="../working-copy/#conflicts">here</a>.</p>
|
|
<h2 id="conflict-markers">Conflict markers<a class="headerlink" href="#conflict-markers" title="Permanent link">¶</a></h2>
|
|
<p>Conflicts are "materialized" using <em>conflict markers</em> in various contexts. For
|
|
example, when you run <code>jj edit</code> on a commit with a conflict, it will be
|
|
materialized in the working copy. Conflicts are also materialized when they are
|
|
part of diff output (e.g. <code>jj show</code> on a commit that introduces or resolves a
|
|
conflict). Here's an example of how Git can render a conflict using <a href="https://git-scm.com/docs/git-merge#_how_conflicts_are_presented">its "diff3"
|
|
style</a>:</p>
|
|
<div class="highlight"><pre><span></span><code> <<<<<<< left
|
|
apple
|
|
grapefruit
|
|
orange
|
|
======= base
|
|
apple
|
|
grape
|
|
orange
|
|
||||||| right
|
|
APPLE
|
|
GRAPE
|
|
ORANGE
|
|
>>>>>>>
|
|
</code></pre></div>
|
|
<p>In this example, the left side changed "grape" to "grapefruit", and the right
|
|
side made all lines uppercase. To resolve the conflict, we would presumably keep
|
|
the right side (the third section) and replace "GRAPE" by "GRAPEFRUIT". This way
|
|
of visually finding the changes between the base and one side and then applying
|
|
them to the other side is a common way of resolving conflicts when using Git's
|
|
"diff3" style.</p>
|
|
<p>Jujutsu helps you by combining the base and one side into a unified diff for
|
|
you, making it easier to spot the differences to apply to the other side. Here's
|
|
how that would look for the same example as above:</p>
|
|
<div class="highlight"><pre><span></span><code> <<<<<<<
|
|
%%%%%%%
|
|
apple
|
|
-grape
|
|
+grapefruit
|
|
orange
|
|
+++++++
|
|
APPLE
|
|
GRAPE
|
|
ORANGE
|
|
>>>>>>>
|
|
</code></pre></div>
|
|
<p>As in Git, the <code><<<<<<<</code> and <code>>>>>>>></code> lines mark the start and end of the
|
|
conflict. The <code>%%%%%%%</code> line indicates the start of a diff. The <code>+++++++</code>
|
|
line indicates the start of a snapshot (not a diff).</p>
|
|
<p>There is another reason for this format (in addition to helping you spot the
|
|
differences): The format supports more complex conflicts involving more than 3
|
|
inputs. Such conflicts can arise when you merge more than 2 commits. They would
|
|
typically be rendered as a single snapshot (as above) but with more than one
|
|
unified diffs. The process for resolving them is similar: Manually apply each
|
|
diff onto the snapshot.</p>
|
|
|
|
|
|
|
|
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</article>
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