Gecko [ sachasauda.akalacademy.ac.in ]

Name	Size	Permission
api-allocation-growing.html	17.55 KB	-rw-r--r--
api-allocation-growing.txt	1019 B	-rw-r--r--
api-argv-array.html	19.44 KB	-rw-r--r--
api-argv-array.txt	2.12 KB	-rw-r--r--
api-builtin.html	19.43 KB	-rw-r--r--
api-builtin.txt	2 KB	-rw-r--r--
api-config.html	23.39 KB	-rw-r--r--
api-config.txt	5.18 KB	-rw-r--r--
api-credentials.html	27.9 KB	-rw-r--r--
api-credentials.txt	8.87 KB	-rw-r--r--
api-decorate.html	16.23 KB	-rw-r--r--
api-decorate.txt	60 B	-rw-r--r--
api-diff.html	24.32 KB	-rw-r--r--
api-diff.txt	5.22 KB	-rw-r--r--
api-directory-listing.html	20.75 KB	-rw-r--r--
api-directory-listing.txt	2.71 KB	-rw-r--r--
api-gitattributes.html	21.9 KB	-rw-r--r--
api-gitattributes.txt	3.62 KB	-rw-r--r--
api-grep.html	16.31 KB	-rw-r--r--
api-grep.txt	76 B	-rw-r--r--
api-hash.html	18.42 KB	-rw-r--r--
api-hash.txt	1.4 KB	-rw-r--r--
api-hashmap.html	35.57 KB	-rw-r--r--
api-hashmap.txt	7.71 KB	-rw-r--r--
api-history-graph.html	24.08 KB	-rw-r--r--
api-history-graph.txt	5.9 KB	-rw-r--r--
api-in-core-index.html	16.96 KB	-rw-r--r--
api-in-core-index.txt	457 B	-rw-r--r--
api-index-skel.txt	431 B	-rw-r--r--
api-index.html	18.45 KB	-rw-r--r--
api-index.sh	611 B	-rw-r--r--
api-index.txt	1.68 KB	-rw-r--r--
api-lockfile.html	20.05 KB	-rw-r--r--
api-lockfile.txt	2.92 KB	-rw-r--r--
api-merge.html	21.36 KB	-rw-r--r--
api-merge.txt	3.3 KB	-rw-r--r--
api-object-access.html	16.73 KB	-rw-r--r--
api-object-access.txt	342 B	-rw-r--r--
api-parse-options.html	31.03 KB	-rw-r--r--
api-parse-options.txt	9.36 KB	-rw-r--r--
api-quote.html	16.42 KB	-rw-r--r--
api-quote.txt	145 B	-rw-r--r--
api-ref-iteration.html	19.71 KB	-rw-r--r--
api-ref-iteration.txt	2.41 KB	-rw-r--r--
api-remote.html	21.26 KB	-rw-r--r--
api-remote.txt	3.3 KB	-rw-r--r--
api-revision-walking.html	19.76 KB	-rw-r--r--
api-revision-walking.txt	2.39 KB	-rw-r--r--
api-run-command.html	28.25 KB	-rw-r--r--
api-run-command.txt	8.08 KB	-rw-r--r--
api-setup.html	16.51 KB	-rw-r--r--
api-setup.txt	180 B	-rw-r--r--
api-sha1-array.html	19.39 KB	-rw-r--r--
api-sha1-array.txt	2.25 KB	-rw-r--r--
api-sigchain.html	17.74 KB	-rw-r--r--
api-sigchain.txt	1.34 KB	-rw-r--r--
api-strbuf.html	32.15 KB	-rw-r--r--
api-strbuf.txt	10.17 KB	-rw-r--r--
api-string-list.html	26.42 KB	-rw-r--r--
api-string-list.txt	6.84 KB	-rw-r--r--
api-tree-walking.html	23.17 KB	-rw-r--r--
api-tree-walking.txt	4.27 KB	-rw-r--r--
api-xdiff-interface.html	16.3 KB	-rw-r--r--
api-xdiff-interface.txt	139 B	-rw-r--r--
index-format.html	27.12 KB	-rw-r--r--
index-format.txt	6.29 KB	-rw-r--r--
pack-format.html	24.08 KB	-rw-r--r--
pack-format.txt	5.54 KB	-rw-r--r--
pack-heuristics.html	42.74 KB	-rw-r--r--
pack-heuristics.txt	17.77 KB	-rw-r--r--
pack-protocol.html	43.12 KB	-rw-r--r--
pack-protocol.txt	20.99 KB	-rw-r--r--
protocol-capabilities.html	25.41 KB	-rw-r--r--
protocol-capabilities.txt	7.09 KB	-rw-r--r--
protocol-common.html	20.08 KB	-rw-r--r--
protocol-common.txt	2.7 KB	-rw-r--r--
racy-git.html	26.85 KB	-rw-r--r--
racy-git.txt	8.63 KB	-rw-r--r--
send-pack-pipeline.html	18.73 KB	-rw-r--r--
send-pack-pipeline.txt	1.92 KB	-rw-r--r--
shallow.html	18.86 KB	-rw-r--r--
shallow.txt	2.3 KB	-rw-r--r--
trivial-merge.html	21.62 KB	-rw-r--r--
trivial-merge.txt	4.16 KB	-rw-r--r--

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<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&#8217;s written to
this fd goes to git-receive-pack to be unpacked.</p></div>
<div class="literalblock">
<div class="content">
<pre><code>send-pack ---&gt; fd ---&gt; receive-pack</code></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><code>send-pack
   |
   pack_objects() ---&gt; fd ---&gt; receive-pack
      | ^ (pipe)
      v |
     (child)</code></pre>
</div></div>
<div class="paragraph"><p>The child dup2&#8217;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&#8217;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><code>send-pack
   |
   pack_objects(parent)
      |
      v [0]
     pack-objects [0] ---&gt; receive-pack</code></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="footnotes"><hr /></div>
<div id="footer">
<div id="footer-text">
Last updated 2013-06-10 20:01:55 UTC
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