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| </head> |
| <body class="article"> |
| <div id="header"> |
| <h1>Packfile URIs</h1> |
| </div> |
| <div id="content"> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This feature allows servers to serve part of their packfile response as URIs. |
| This allows server designs that improve scalability in bandwidth and CPU usage |
| (for example, by serving some data through a CDN), and (in the future) provides |
| some measure of resumability to clients.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This feature is available only in protocol version 2.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_protocol">Protocol</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The server advertises the <code>packfile-uris</code> capability.</p> |
| </div> |
| <div class="paragraph"> |
| <p>If the client then communicates which protocols (HTTPS, etc.) it supports with |
| a <code>packfile-uris</code> argument, the server MAY send a <code>packfile-uris</code> section |
| directly before the <code>packfile</code> section (right after <code>wanted-refs</code> if it is |
| sent) containing URIs of any of the given protocols. The URIs point to |
| packfiles that use only features that the client has declared that it supports |
| (e.g. ofs-delta and thin-pack). See <a href="../gitprotocol-v2.html">gitprotocol-v2(5)</a> for the documentation of |
| this section.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Clients should then download and index all the given URIs (in addition to |
| downloading and indexing the packfile given in the <code>packfile</code> section of the |
| response) before performing the connectivity check.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_server_design">Server design</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The server can be trivially made compatible with the proposed protocol by |
| having it advertise <code>packfile-uris</code>, tolerating the client sending |
| <code>packfile-uris</code>, and never sending any <code>packfile-uris</code> section. But we should |
| include some sort of non-trivial implementation in the Minimum Viable Product, |
| at least so that we can test the client.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This is the implementation: a feature, marked experimental, that allows the |
| server to be configured by one or more <code>uploadpack.blobPackfileUri=</code> |
| <em><object-hash></em> <em><pack-hash></em> <em><uri></em> entries. Whenever the list of objects to be |
| sent is assembled, all such blobs are excluded, replaced with URIs. As noted |
| in "Future work" below, the server can evolve in the future to support |
| excluding other objects (or other implementations of servers could be made |
| that support excluding other objects) without needing a protocol change, so |
| clients should not expect that packfiles downloaded in this way only contain |
| single blobs.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_client_design">Client design</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The client has a config variable <code>fetch.uriprotocols</code> that determines which |
| protocols the end user is willing to use. By default, this is empty.</p> |
| </div> |
| <div class="paragraph"> |
| <p>When the client downloads the given URIs, it should store them with "keep" |
| files, just like it does with the packfile in the <code>packfile</code> section. These |
| additional "keep" files can only be removed after the refs have been updated - |
| just like the "keep" file for the packfile in the <code>packfile</code> section.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The division of work (initial fetch + additional URIs) introduces convenient |
| points for resumption of an interrupted clone - such resumption can be done |
| after the Minimum Viable Product (see "Future work").</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_future_work">Future work</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The protocol design allows some evolution of the server and client without any |
| need for protocol changes, so only a small-scoped design is included here to |
| form the MVP. For example, the following can be done:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>On the server, more sophisticated means of excluding objects (e.g. by |
| specifying a commit to represent that commit and all objects that it |
| references).</p> |
| </li> |
| <li> |
| <p>On the client, resumption of clone. If a clone is interrupted, information |
| could be recorded in the repository’s config and a "clone-resume" command |
| can resume the clone in progress. (Resumption of subsequent fetches is more |
| difficult because that must deal with the user wanting to use the repository |
| even after the fetch was interrupted.)</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>There are some possible features that will require a change in protocol:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Additional HTTP headers (e.g. authentication)</p> |
| </li> |
| <li> |
| <p>Byte range support</p> |
| </li> |
| <li> |
| <p>Different file formats referenced by URIs (e.g. raw object)</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated 2025-06-20 18:10:42 -0700 |
| </div> |
| </div> |
| </body> |
| </html> |
