forked from mirrors/jj
f67d6a192c
The replacement was done by `sed`.
This should only change versions of the docs prior to 864869ab (in
particular, not the `latest` version nor the `prerelease` version), and
make it as though the old version of the docs were compiled with that
commit. It tries to solve the same problem:
https://www.google.com/search?q=jj+revsets still points to jj v0.13
docs.
Google seems really slow to update its index, and I'm beginning to worry
that it might think we have a spammy site with many almost identical
pages. I hope it will pick up this change once it tries to update its
crawl of pages it's already indexing.
Loosely related reading: https://news.ycombinator.com/item?id=40970987
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<article class="md-content__inner md-typeset">
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<h1 id="operation-log">Operation log<a class="headerlink" href="#operation-log" title="Permanent link">¶</a></h1>
|
|
<h2 id="introduction">Introduction<a class="headerlink" href="#introduction" title="Permanent link">¶</a></h2>
|
|
<p>Jujutsu records each operation that modifies the repo in the "operation log".
|
|
You can see the log with <code>jj op log</code>. Each operation object contains a snapshot
|
|
of how the repo looked at the end of the operation. We call this snapshot a
|
|
"view" object. The view contains information about where each branch, tag, and
|
|
Git ref (in Git-backed repos) pointed, as well as the set of heads in the repo,
|
|
and the current working-copy commit in each workspace. The operation object also
|
|
(in addition to the view) contains pointers to the operation(s) immediately
|
|
before it, as well as metadata about the operation, such as timestamps,
|
|
username, hostname, description.</p>
|
|
<p>The operation log allows you to undo an operation (<code>jj [op] undo</code>), which doesn't
|
|
need to be the most recent one. It also lets you restore the entire repo to the
|
|
way it looked at an earlier point (<code>jj op restore</code>).</p>
|
|
<p>When referring to operations, you can use <code>@</code> to represent the current operation
|
|
as well as the <code>-</code> operator (e.g. <code>@-</code>) to get the parent of an operation.</p>
|
|
<h2 id="concurrent-operations">Concurrent operations<a class="headerlink" href="#concurrent-operations" title="Permanent link">¶</a></h2>
|
|
<p>One benefit of the operation log (and the reason for its creation) is that it
|
|
allows lock-free concurrency -- you can run concurrent <code>jj</code> commands without
|
|
corrupting the repo, even if you run the commands on different machines that
|
|
access the repo via a distributed file system (as long as the file system
|
|
guarantees that a write is only visible once previous writes are visible). When
|
|
you run a <code>jj</code> command, it will start by loading the repo at the latest
|
|
operation. It will not see any changes written by concurrent commands. If there
|
|
are conflicts, you will be informed of them by subsequent <code>jj st</code> and/or
|
|
<code>jj log</code> commands.</p>
|
|
<p>As an example, let's say you had started editing the description of a change and
|
|
then also update the contents of the change (maybe because you had forgotten the
|
|
editor). When you eventually close your editor, the command will succeed and
|
|
e.g. <code>jj log</code> will indicate that the change has diverged.</p>
|
|
<h2 id="loading-an-old-version-of-the-repo">Loading an old version of the repo<a class="headerlink" href="#loading-an-old-version-of-the-repo" title="Permanent link">¶</a></h2>
|
|
<p>The top-level <code>--at-operation/--at-op</code> option allows you to load the repo at a
|
|
specific operation. This can be useful for understanding how your repo got into
|
|
the current state. It can be even more useful for understanding why someone
|
|
else's repo got into its current state.</p>
|
|
<p>When you use <code>--at-op</code>, the automatic snapshotting of the working copy will not
|
|
take place. When referring to a revision with the <code>@</code> symbol (as many commands
|
|
do by default), that will resolve to the working-copy commit recorded in the
|
|
operation's view (which is actually how it always works -- it's just the
|
|
snapshotting that's skipped with <code>--at-op</code>).</p>
|
|
<p>As a top-level option, <code>--at-op</code> can be passed to any command. However, you
|
|
will typically only want to run read-only commands. For example, <code>jj log</code>,
|
|
<code>jj st</code>, and <code>jj diff</code> all make sense. It's still possible to run e.g.
|
|
<code>jj --at-op=<some operation ID> describe</code>. That's equivalent to having started
|
|
<code>jj describe</code> back when the specified operation was the most recent operation
|
|
and then let it run until now (which can be done for that particular command by
|
|
not closing the editor). There's practically no good reason to do that other
|
|
than to simulate concurrent commands.</p>
|
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</article>
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