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Objective
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Current data model (as of jj 0.8.0)
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Proposed data model
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fetch/import
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push/export
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init/clone
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branch
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Command behavior examples
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fetch/import
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push/export
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@git remote
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Remaining issues
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References
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Objective
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Current data model (as of jj 0.8.0)
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Proposed data model
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Mapping to the current data model
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Common command behaviors
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<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#fetchimport" class="md-nav__link">
fetch/import
</a>
</li>
<li class="md-nav__item">
<a href="#pushexport" class="md-nav__link">
push/export
</a>
</li>
<li class="md-nav__item">
<a href="#initclone" class="md-nav__link">
init/clone
</a>
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<a href="#branch" class="md-nav__link">
branch
</a>
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Command behavior examples
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<ul class="md-nav__list">
<li class="md-nav__item">
<a href="#fetchimport_1" class="md-nav__link">
fetch/import
</a>
</li>
<li class="md-nav__item">
<a href="#pushexport_1" class="md-nav__link">
push/export
</a>
</li>
<li class="md-nav__item">
<a href="#git-remote" class="md-nav__link">
@git remote
</a>
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Remaining issues
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References
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<div class="md-content" data-md-component="content">
<article class="md-content__inner md-typeset">
<h1 id="remotegit-tracking-branches">Remote/<code>@git</code> tracking branches<a class="headerlink" href="#remotegit-tracking-branches" title="Permanent link">&para;</a></h1>
<p>This is a plan to implement more Git-like remote tracking branch UX.</p>
<h2 id="objective">Objective<a class="headerlink" href="#objective" title="Permanent link">&para;</a></h2>
<p><code>jj</code> imports all remote branches to local branches by default. As described in
<a href="https://github.com/martinvonz/jj/issues/1136">#1136</a>, this doesn't interact nicely with Git if we have multiple Git remotes
with a number of branches. The <code>git.auto-local-branch</code> config can mitigate this
problem, but we'll get locally-deleted branches instead.</p>
<p>The goal of this plan is to implement
* proper support for tracking/non-tracking remote branches
* logically consistent data model for importing/exporting Git refs</p>
<h2 id="current-data-model-as-of-jj-080">Current data model (as of jj 0.8.0)<a class="headerlink" href="#current-data-model-as-of-jj-080" title="Permanent link">&para;</a></h2>
<p>Under the current model, all remote branches are "tracking" branches, and
remote changes are merged into the local counterparts.</p>
<div class="highlight"><pre><span></span><code>branches
[name]:
local_target?
remote_targets[remote]: target
tags
[name]: target
git_refs
[&quot;refs/heads/{name}&quot;]: target # last-known local branches
[&quot;refs/remotes/{remote}/{name}&quot;]: target # last-known remote branches
# (copied to remote_targets)
[&quot;refs/tags/{name}&quot;]: target # last-known tags
git_head: target?
</code></pre></div>
<ul>
<li>Remote branches are stored in both <code>branches[name].remote_targets</code> and
<code>git_refs["refs/remotes"]</code>. These two are kept in sync unless the branch is
removed by <code>jj branch forget</code> command.</li>
<li>Pseudo <code>@git</code> remote branches are stored in <code>git_refs["refs/heads"]</code>.</li>
</ul>
<h2 id="proposed-data-model">Proposed data model<a class="headerlink" href="#proposed-data-model" title="Permanent link">&para;</a></h2>
<p>We'll add a per-remote-branch <code>state</code> to distinguish non-tracking branches
from tracking ones.</p>
<div class="highlight"><pre><span></span><code>state = new # not merged in the local branch or tag
| tracking # merged in the local branch or tag
| forgotten # to be expunged on the next export
# `ignored` state could be added if we want to manage it by view, not by
# config file. target of ignored remote branch would be absent.
</code></pre></div>
<p>We'll add a per-remote view-like object to record the last known remote
branches. It will replace <code>git_refs</code> and <code>branches[name].remote_targets</code> in
the current model.</p>
<div class="highlight"><pre><span></span><code>branches
[name]: target
tags
[name]: target
remotes
[&quot;git&quot;]:
branches
[name]: target, state # refs/heads/{name}
tags
[name]: target, state = tracking # refs/tags/{name}
head: target?, state = TBD # refs/HEAD
[remote]:
branches
[name]: target, state # refs/remotes/{remote}/{name}
tags: (empty)
head: (empty)
</code></pre></div>
<p>With the proposed data model, we can
* naturally support remote branches which have no local counterparts
* deduplicate <code>branches[name].remote_targets</code> and <code>git_refs["refs/remotes"]</code>
* eliminate <code>git_</code> variables and methods from the view object</p>
<p>The <code>git.auto-local-branch</code> config knob is applied when importing new remote
branch. <code>jj branch</code> sub commands will be added to change the tracking state.</p>
<div class="highlight"><pre><span></span><code><span class="k">fn</span> <span class="nf">default_state_for_newly_imported_branch</span><span class="p">(</span><span class="n">config</span><span class="p">,</span><span class="w"> </span><span class="n">remote</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">remote</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="s">&quot;git&quot;</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">State</span>::<span class="n">Tracking</span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="n">config</span><span class="p">[</span><span class="s">&quot;git.auto-local-branch&quot;</span><span class="p">]</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">State</span>::<span class="n">Tracking</span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">State</span>::<span class="n">New</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<p>A branch target to be merged is calculated based on the <code>state</code>.</p>
<div class="highlight"><pre><span></span><code><span class="k">fn</span> <span class="nf">target_in_merge_context</span><span class="p">(</span><span class="n">known_target</span><span class="p">,</span><span class="w"> </span><span class="n">state</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">match</span><span class="w"> </span><span class="n">state</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">State</span>::<span class="n">New</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="n">RefTarget</span>::<span class="n">absent</span><span class="p">(),</span>
<span class="w"> </span><span class="n">State</span>::<span class="n">Tracking</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="n">known_target</span><span class="p">,</span>
<span class="w"> </span><span class="n">State</span>::<span class="n">Forgotten</span><span class="w"> </span><span class="o">=&gt;</span><span class="w"> </span><span class="n">RefTarget</span>::<span class="n">absent</span><span class="p">(),</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h3 id="mapping-to-the-current-data-model">Mapping to the current data model<a class="headerlink" href="#mapping-to-the-current-data-model" title="Permanent link">&para;</a></h3>
<ul>
<li>New <code>remotes["git"].branches</code> corresponds to <code>git_refs["refs/heads"]</code>.</li>
<li>New <code>remotes["git"].tags</code> corresponds to <code>git_refs["refs/tags"]</code>.</li>
<li>New <code>remotes["git"].head</code> corresponds to <code>git_head</code>.</li>
<li>New <code>remotes[remote].branches</code> corresponds to
<code>git_refs["refs/remotes/{remote}"]</code> and <code>branches[].remote_targets[remote]</code>.</li>
<li>If <code>git_refs["refs/remotes/{remote}"]</code> exists but <code>.remote_targets</code> doesn't,
it means <code>state = forgotten</code> in new model.</li>
<li><code>state = new|tracking</code> doesn't exist in the current model. It's determined
by <code>git.auto-local-branch</code> config.</li>
</ul>
<h2 id="common-command-behaviors">Common command behaviors<a class="headerlink" href="#common-command-behaviors" title="Permanent link">&para;</a></h2>
<p>In the following sections, a merge is expressed as <code>adds - removes</code>.
In particular, a merge of local and remote targets is
<code>[local, remote] - [known_remote]</code>.</p>
<h3 id="fetchimport">fetch/import<a class="headerlink" href="#fetchimport" title="Permanent link">&para;</a></h3>
<ul>
<li>
<p><code>jj git fetch</code>
1. Fetches remote changes to the backing Git repo.
2. Import changes only for <code>remotes[remote].branches[glob]</code> (see below)</p>
<ul>
<li>TODO: how about fetched <code>.tags</code>?</li>
</ul>
</li>
<li>
<p><code>jj git import</code>
1. Calculates diff from the known <code>remotes</code> to the actual git repo.</p>
<ul>
<li><code>"refs/heads" - remotes["git"].branches</code></li>
<li><code>"refs/tags" - remotes["git"].tags</code></li>
<li><code>"HEAD" - remotes["git"].head</code> (unused)</li>
<li><code>"refs/remotes/{remote}" - remotes[remote]</code>
2. Merges diff in local <code>branches</code> and <code>tags</code> if <code>state</code> is <code>tracking</code>.</li>
<li>If the branch is new, the default <code>state</code> should be calculated.</li>
<li>If <code>state</code> is <code>forgotten</code>, the known branch is supposed to be removed,
and the default <code>state</code> should be calculated.
3. Updates <code>remotes</code> reflecting the import.</li>
<li><code>absent</code> entries are removed from <code>remotes</code>.
4. Abandons commits that are no longer referenced.</li>
</ul>
</li>
</ul>
<h3 id="pushexport">push/export<a class="headerlink" href="#pushexport" title="Permanent link">&para;</a></h3>
<ul>
<li>
<p><code>jj git push</code>
1. Calculates diff from the known <code>remotes[remote]</code> to the local changes.</p>
<ul>
<li><code>branches - remotes[remote].branches</code></li>
<li>If <code>state</code> is <code>new|forgotten</code> (i.e. untracked), the known remote
branch <code>target</code> is considered <code>absent</code>.</li>
<li>If <code>state</code> is <code>new|forgotten</code>, and if the local branch <code>target</code> is
<code>absent</code>, the diff <code>[absent, remote] - absent</code> is noop. So it's not
allowed to push deleted branch to untracked remote.</li>
<li>TODO: Copy Git's <code>--force-with-lease</code> behavior?</li>
<li>~<code>tags</code>~ (not implemented, but should be the same as <code>branches</code>)
2. Pushes diff to the remote Git repo (as well as remote tracking branches
in the backing Git repo.)
3. Sets <code>remotes[remote].branches[name].state = tracking</code>
4. Import changes only for <code>remotes[remote].branches[glob]</code></li>
</ul>
</li>
<li>
<p><code>jj git export</code>
1. Calculates diff from the known <code>remotes["git"]</code> to the local changes
and forgotten branches.</p>
<ul>
<li><code>branches - remotes["git"].branches</code> if <code>state</code> is <code>tracking</code></li>
<li>If <code>remotes["git"].branches[name]</code> is <code>absent</code>, the default
<code>state = tracking</code> applies.</li>
<li>If <code>state</code> is <code>forgotten</code> but local branch exists,
<code>remotes["git"].branches[name]</code> is supposed to be removed, and
the default <code>state = tracking</code> applies.</li>
<li>~<code>tags</code>~ (not implemented, but should be the same as <code>branches</code>)</li>
<li><code>absent - remotes[remote].branches</code> if <code>state</code> is <code>forgotten</code>
2. Applies diff to the backing Git repo.
3. Updates <code>remotes</code> reflecting the export.</li>
<li><code>absent</code> entries are removed from <code>remotes</code>.</li>
</ul>
</li>
</ul>
<h3 id="initclone">init/clone<a class="headerlink" href="#initclone" title="Permanent link">&para;</a></h3>
<ul>
<li><code>jj init</code></li>
<li>Import, track, and merge per <code>git.auto_local_branch</code> config.</li>
<li>
<p>If <code>!git.auto_local_branch</code>, no <code>tracking</code> state will be set.</p>
</li>
<li>
<p><code>jj git clone</code></p>
</li>
<li>Import, track, and merge per <code>git.auto_local_branch</code> config.</li>
<li>The default branch will be tracked regardless of <code>git.auto_local_branch</code>
config. (Because local branch is created for the default remote branch,
it makes sense to track.)</li>
</ul>
<h3 id="branch">branch<a class="headerlink" href="#branch" title="Permanent link">&para;</a></h3>
<ul>
<li><code>jj branch set {name}</code>
1. Sets local <code>branches[name]</code> entry.</li>
<li><code>jj branch delete {name}</code>
1. Removes local <code>branches[name]</code> entry.</li>
<li><code>jj branch forget {name}</code>
1. Removes local <code>branches[name]</code> entry if exists.
2. Sets all <code>remotes[remote].branches[name].state = forgotten</code>.</li>
<li><code>jj branch track {name}@{remote}</code> (new command)
1. Merges <code>[local, remote] - [absent]</code> in local branch.<ul>
<li>Same as "fetching/importing existing branch from untracked remote".
2. Sets <code>remotes[remote].branches[name].state = tracking</code>.</li>
</ul>
</li>
<li><code>jj branch untrack {name}@{remote}</code> (new command)
1. Sets <code>remotes[remote].branches[name].state = new</code>.</li>
<li><code>jj branch list</code></li>
<li>TODO: hide non-tracking branches by default? ...</li>
</ul>
<p>Note: desired behavior of <code>jj branch forget</code> is to
* discard both local and remote branches (without actually removing branches
at remotes)
* not abandon commits which belongs to those branches (even if the branch is
removed at a remote)</p>
<h2 id="command-behavior-examples">Command behavior examples<a class="headerlink" href="#command-behavior-examples" title="Permanent link">&para;</a></h2>
<h3 id="fetchimport_1">fetch/import<a class="headerlink" href="#fetchimport_1" title="Permanent link">&para;</a></h3>
<ul>
<li>Fetching/importing new branch
1. Decides new <code>state = new|tracking</code> based on <code>git.auto_local_branch</code>
2. If new <code>state</code> is <code>tracking</code>, merges <code>[absent, new_remote] - [absent]</code>
(i.e. creates local branch with <code>new_remote</code> target)
3. Sets <code>remotes[remote].branches[name].state</code></li>
<li>Fetching/importing existing branch from tracking remote
1. Merges <code>[local, new_remote] - [known_remote]</code></li>
<li>Fetching/importing existing branch from untracked remote
1. Decides new <code>state = new|tracking</code> based on <code>git.auto_local_branch</code>
2. If new <code>state</code> is <code>tracking</code>, merges <code>[local, new_remote] - [absent]</code>
3. Sets <code>remotes[remote].branches[name].state</code></li>
<li>Fetching/importing remotely-deleted branch from tracking remote
1. Merges <code>[local, absent] - [known_remote]</code>
2. Removes <code>remotes[remote].branches[name]</code> (<code>target</code> becomes <code>absent</code>)
(i.e. the remote branch is no longer tracked)
3. Abandons commits in the deleted branch</li>
<li>Fetching/importing remotely-deleted branch from untracked remote
1. Decides new <code>state = new|tracking</code> based on <code>git.auto_local_branch</code>
2. Noop anyway since <code>[local, absent] - [absent]</code> -&gt; <code>local</code></li>
<li>Fetching previously-forgotten branch from remote
1. Decides new <code>state = new|tracking</code> based on <code>git.auto_local_branch</code>
2. If new <code>state</code> is <code>tracking</code>, merges
<code>[absent, new_remote] - [absent]</code> -&gt; <code>new_remote</code>
(The known <code>target</code> of forgotten remote branch is <code>absent</code>)
3. Sets <code>remotes[remote].branches[name].state</code></li>
<li>Fetching forgotten and remotely-deleted branch</li>
<li>Same as "remotely-deleted branch from untracked remote" since <code>forgotten</code>
remote branch should never be <code>tracking</code></li>
<li>Therefore, no local commits should be abandoned</li>
</ul>
<h3 id="pushexport_1">push/export<a class="headerlink" href="#pushexport_1" title="Permanent link">&para;</a></h3>
<ul>
<li>Pushing/exporting new branch, remote doesn't exist
1. Exports <code>[local, absent] - [absent]</code> -&gt; <code>local</code>
2. Sets <code>remotes[remote].branches[name].state = tracking</code>
3. <code>import_refs()</code> merges <code>[local, local] - [absent]</code> -&gt; <code>local</code> (noop)</li>
<li>Pushing/exporting new branch, untracked remote exists
1. Exports <code>[local, remote] - [absent]</code><ul>
<li>Fails if <code>local</code> moved backwards or sideways
2. Sets <code>remotes[remote].branches[name].state = tracking</code>
3. <code>import_refs()</code> merges <code>[local, local] - [remote]</code> -&gt; <code>local</code> (noop)</li>
</ul>
</li>
<li>Pushing/exporting existing branch to tracking remote
1. Exports <code>[local, remote] - [remote]</code> -&gt; <code>local</code><ul>
<li>Fails if <code>local</code> moved backwards or sideways, and if <code>remote</code> is out of
sync
2. <code>import_refs()</code> merges <code>[local, local] - [remote]</code> -&gt; <code>local</code> (noop)</li>
</ul>
</li>
<li>Pushing/exporting existing branch to untracked remote</li>
<li>Same as "new branch"</li>
<li>Pushing/exporting deleted branch to tracking remote
1. Exports <code>[absent, remote] - [remote]</code> -&gt; <code>absent</code><ul>
<li>TODO: Fails if <code>remote</code> is out of sync?
2. <code>import_refs()</code> merges <code>[absent, absent] - [remote]</code> -&gt; <code>absent</code>
3. Removes <code>remotes[remote].branches[name]</code> (<code>target</code> becomes <code>absent</code>)</li>
</ul>
</li>
<li>Pushing/exporting deleted branch to untracked remote</li>
<li>Noop since <code>[absent, remote] - [absent]</code> -&gt; <code>remote</code></li>
<li>Perhaps, UI will report error</li>
<li>Pushing forgotten branch to untracked remote</li>
<li>Same as "deleted branch to untracked remote"</li>
<li>Exporting forgotten branch
1. Local branch change is noop since <code>[absent, absent] - [absent]</code> -&gt; <code>absent</code>
2. Exports <code>forgotten</code> state to the backing Git repo:
<code>[absent, known_remote] - [known_remote]</code> -&gt; <code>absent</code>
(This includes local branch in the pseudo <code>"git"</code> remote)
3. Removes <code>remotes[remote].branches[name]</code> (<code>target</code> becomes <code>absent</code>)</li>
<li>Pushing previously-forgotten branch to remote</li>
<li>Same as "new branch, untracked remote exists"</li>
<li>The known <code>target</code> of forgotten remote branch is <code>absent</code></li>
</ul>
<h3 id="git-remote"><code>@git</code> remote<a class="headerlink" href="#git-remote" title="Permanent link">&para;</a></h3>
<ul>
<li><code>jj branch untrack {name}@git</code></li>
<li>Maybe rejected (to avoid confusion)?</li>
<li>Allowing this would mean different local branches of the same name coexist
in jj and git.</li>
<li><code>jj git fetch --remote git</code></li>
<li>Maybe rejected (to avoid confusion)?</li>
<li>Conceptually, it's <code>git::import_refs()</code> only for local branches.</li>
<li><code>jj git push --remote git</code></li>
<li>Maybe rejected (to avoid confusion)?</li>
<li>Conceptually, it's <code>jj branch track</code> and <code>git::export_refs()</code> only for
local branches.</li>
</ul>
<h2 id="remaining-issues">Remaining issues<a class="headerlink" href="#remaining-issues" title="Permanent link">&para;</a></h2>
<ul>
<li><code>git.auto_local_branch = false</code> by default to help Git interop?</li>
<li>https://github.com/martinvonz/jj/issues/1862</li>
<li>https://github.com/martinvonz/jj/issues/1278 pushing to tracked remote</li>
<li>Option could be added to push to all <code>tracking</code> remotes?</li>
<li>Track remote branch locally with different name</li>
<li>Local branch name could be stored per remote branch</li>
<li>Consider UI complexity</li>
<li>"private" state (suggested by @ilyagr)</li>
<li>"private" branches can be pushed to their own remote, but not to the
upstream repo</li>
<li>This might be a state attached to a local branch (similar to Mercurial's
"secret" phase)</li>
</ul>
<h2 id="references">References<a class="headerlink" href="#references" title="Permanent link">&para;</a></h2>
<ul>
<li>https://github.com/martinvonz/jj/issues/1136</li>
<li>https://github.com/martinvonz/jj/issues/1666</li>
<li>https://github.com/martinvonz/jj/issues/1690</li>
<li>https://github.com/martinvonz/jj/issues/1734</li>
<li>https://github.com/martinvonz/jj/pull/1739</li>
</ul>
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