technical/long-running-process-protocol.html

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 435 </head>
 436 <body class="article">
 437 <div id="header">
 438 <h1>Long-running process protocol</h1>
 439 <div class="details">
 440 <span id="revdate">2024-10-02</span>
 441 </div>
 442 </div>
 443 <div id="content">
 444 <div id="preamble">
 445 <div class="sectionbody">
 446 <div class="paragraph">
 447 <p>This protocol is used when Git needs to communicate with an external
 448 process throughout the entire life of a single Git command. All
 449 communication is in pkt-line format (see <a href="../gitprotocol-common.html">gitprotocol-common(5)</a>)
 450 over standard input and standard output.</p>
 451 </div>
 452 </div>
 453 </div>
 454 <div class="sect1">
 455 <h2 id="_handshake">Handshake</h2>
 456 <div class="sectionbody">
 457 <div class="paragraph">
 458 <p>Git starts by sending a welcome message (for example,
 459 "git-filter-client"), a list of supported protocol version numbers, and
 460 a flush packet. Git expects to read the welcome message with "server"
 461 instead of "client" (for example, "git-filter-server"), exactly one
 462 protocol version number from the previously sent list, and a flush
 463 packet. All further communication will be based on the selected version.
 464 The remaining protocol description below documents "version=2". Please
 465 note that "version=42" in the example below does not exist and is only
 466 there to illustrate how the protocol would look like with more than one
 467 version.</p>
 468 </div>
 469 <div class="paragraph">
 470 <p>After the version negotiation Git sends a list of all capabilities that
 471 it supports and a flush packet. Git expects to read a list of desired
 472 capabilities, which must be a subset of the supported capabilities list,
 473 and a flush packet as response:</p>
 474 </div>
 475 <div class="listingblock">
 476 <div class="content">
 477 <pre>packet:          git&gt; git-filter-client
 478 packet:          git&gt; version=2
 479 packet:          git&gt; version=42
 480 packet:          git&gt; 0000
 481 packet:          git&lt; git-filter-server
 482 packet:          git&lt; version=2
 483 packet:          git&lt; 0000
 484 packet:          git&gt; capability=clean
 485 packet:          git&gt; capability=smudge
 486 packet:          git&gt; capability=not-yet-invented
 487 packet:          git&gt; 0000
 488 packet:          git&lt; capability=clean
 489 packet:          git&lt; capability=smudge
 490 packet:          git&lt; 0000</pre>
 491 </div>
 492 </div>
 493 </div>
 494 </div>
 495 <div class="sect1">
 496 <h2 id="_shutdown">Shutdown</h2>
 497 <div class="sectionbody">
 498 <div class="paragraph">
 499 <p>Git will close
 500 the command pipe on exit. The filter is expected to detect EOF
 501 and exit gracefully on its own. Git will wait until the filter
 502 process has stopped.</p>
 503 </div>
 504 </div>
 505 </div>
 506 </div>
 507 <div id="footer">
 508 <div id="footer-text">
 509 Last updated 2022-08-18 14:11:07 -0700
 510 </div>
 511 </div>
 512 </body>
 513 </html>