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| </head> |
| <body class="article"> |
| <div id="header"> |
| <h1>Path-Walk API</h1> |
| </div> |
| <div id="content"> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The path-walk API is used to walk reachable objects, but to visit objects |
| in batches based on a common path they appear in, or by type.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For example, all reachable commits are visited in a group. All tags are |
| visited in a group. Then, all root trees are visited. At some point, all |
| blobs reachable via a path <code>my/dir/to/A</code> are visited. When there are |
| multiple paths possible to reach the same object, then only one of those |
| paths is used to visit the object.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_basics">Basics</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>To use the path-walk API, include <code>path-walk.h</code> and call |
| <code>walk_objects_by_path</code>() with a customized <code>path_walk_info</code> struct. The |
| struct is used to set all of the options for how the walk should proceed. |
| Let’s dig into the different options and their use.</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1"><code>path_fn</code> and <code>path_fn_data</code></dt> |
| <dd> |
| <p>The most important option is the <code>path_fn</code> option, which is a |
| function pointer to the callback that can execute logic on the |
| object IDs for objects grouped by type and path. This function |
| also receives a <code>data</code> value that corresponds to the |
| <code>path_fn_data</code> member, for providing custom data structures to |
| this callback function.</p> |
| </dd> |
| <dt class="hdlist1"><code>revs</code></dt> |
| <dd> |
| <p>To configure the exact details of the reachable set of objects, |
| use the <code>revs</code> member and initialize it using the revision |
| machinery in <code>revision.h</code>. Initialize <code>revs</code> using calls such as |
| <code>setup_revisions</code>() or <code>parse_revision_opt</code>(). Do not call |
| <code>prepare_revision_walk</code>(), as that will be called within |
| <code>walk_objects_by_path</code>().</p> |
| <div class="paragraph"> |
| <p>It is also important that you do not specify the <code>--objects</code> flag for the |
| <code>revs</code> struct. The revision walk should only be used to walk commits, and |
| the objects will be walked in a separate way based on those starting |
| commits.</p> |
| </div> |
| </dd> |
| <dt class="hdlist1"><code>commits</code>, <code>blobs</code>, <code>trees</code>, <code>tags</code></dt> |
| <dd> |
| <p>By default, these members are enabled and signal that the path-walk |
| API should call the <code>path_fn</code> on objects of these types. Specialized |
| applications could disable some options to make it simpler to walk |
| the objects or to have fewer calls to <code>path_fn</code>.</p> |
| <div class="paragraph"> |
| <p>While it is possible to walk only commits in this way, consumers would be |
| better off using the revision walk API instead.</p> |
| </div> |
| </dd> |
| <dt class="hdlist1"><code>prune_all_uninteresting</code></dt> |
| <dd> |
| <p>By default, all reachable paths are emitted by the path-walk API. |
| This option allows consumers to declare that they are not |
| interested in paths where all included objects are marked with the |
| <code>UNINTERESTING</code> flag. This requires using the <code>boundary</code> option in |
| the revision walk so that the walk emits commits marked with the |
| <code>UNINTERESTING</code> flag.</p> |
| </dd> |
| <dt class="hdlist1"><code>edge_aggressive</code></dt> |
| <dd> |
| <p>For performance reasons, usually only the boundary commits are |
| explored to find UNINTERESTING objects. However, in the case of |
| shallow clones it can be helpful to mark all trees and blobs |
| reachable from UNINTERESTING tip commits as UNINTERESTING. This |
| matches the behavior of <code>--objects-edge-aggressive</code> in the |
| revision API.</p> |
| </dd> |
| <dt class="hdlist1"><code>pl</code></dt> |
| <dd> |
| <p>This pattern list pointer allows focusing the path-walk search to |
| a set of patterns, only emitting paths that match the given |
| patterns. See <a href="../gitignore.html">gitignore(5)</a> or |
| <a href="../git-sparse-checkout.html">git-sparse-checkout(1)</a> for details about pattern lists. |
| When the pattern list uses cone-mode patterns, then the path-walk |
| API can prune the set of paths it walks to improve performance.</p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_examples">Examples</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>See example usages in: |
| <code>t/helper/test-path-walk.c</code>, |
| <code>builtin/pack-objects.c</code>, |
| <code>builtin/backfill.c</code></p> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated 2025-06-24 11:24:02 -0700 |
| </div> |
| </div> |
| </body> |
| </html> |
