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send-pack-pipeline.html
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<title>Git-send-pack internals</title>
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</head>
<body class="article">
<div id="header">
<h1>Git-send-pack internals</h1>
</div>
<div id="content">
<div class="sect1">
<h2 id="_overall_operation">Overall operation</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Connects to the remote side and invokes git-receive-pack.</p>
</li>
<li>
<p>Learns what refs the remote has and what commit they point at.
Matches them to the refspecs we are pushing.</p>
</li>
<li>
<p>Checks if there are non-fast-forwards. Unlike fetch-pack,
the repository send-pack runs in is supposed to be a superset
of the recipient in fast-forward cases, so there is no need
for want/have exchanges, and fast-forward check can be done
locally. Tell the result to the other end.</p>
</li>
<li>
<p>Calls pack_objects() which generates a packfile and sends it
over to the other end.</p>
</li>
<li>
<p>If the remote side is new enough (v1.1.0 or later), wait for
the unpack and hook status from the other end.</p>
</li>
<li>
<p>Exit with appropriate error codes.</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_pack_objects_pipeline">Pack_objects pipeline</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This function gets one file descriptor (<code>fd</code>) which is either a
socket (over the network) or a pipe (local). What’s written to
this fd goes to git-receive-pack to be unpacked.</p>
</div>
<div class="literalblock">
<div class="content">
<pre>send-pack ---> fd ---> receive-pack</pre>
</div>
</div>
<div class="paragraph">
<p>The function pack_objects creates a pipe and then forks. The
forked child execs pack-objects with --revs to receive revision
parameters from its standard input. This process will write the
packfile to the other end.</p>
</div>
<div class="literalblock">
<div class="content">
<pre> send-pack
|
pack_objects() ---> fd ---> receive-pack
| ^ (pipe)
v |
(child)</pre>
</div>
</div>
<div class="paragraph">
<p>The child dup2’s to arrange its standard output to go back to
the other end, and read its standard input to come from the
pipe. After that it exec’s pack-objects. On the other hand,
the parent process, before starting to feed the child pipeline,
closes the reading side of the pipe and fd to receive-pack.</p>
</div>
<div class="literalblock">
<div class="content">
<pre> send-pack
|
pack_objects(parent)
|
v [0]
pack-objects [0] ---> receive-pack</pre>
</div>
</div>
<div class="paragraph">
<p>[jc: the pipeline was much more complex and needed documentation before
I understood an earlier bug, but now it is trivial and straightforward.]</p>
</div>
</div>
</div>
</div>
<div id="footer">
<div id="footer-text">
Last updated 2025-02-14 21:38:14 -0800
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