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| </head> |
| <body class="article"> |
| <div id="header"> |
| <h1>Directory rename detection</h1> |
| </div> |
| <div id="content"> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Rename detection logic in diffcore-rename that checks for renames of |
| individual files is also aggregated there and then analyzed in either |
| merge-ort or merge-recursive for cases where combinations of renames |
| indicate that a full directory has been renamed.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_scope_of_abilities">Scope of abilities</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>It is perhaps easiest to start with an example:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>When all of x/a, x/b and x/c have moved to z/a, z/b and z/c, it is |
| likely that x/d added in the meantime would also want to move to z/d by |
| taking the hint that the entire directory <em>x</em> moved to <em>z</em>.</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>More interesting possibilities exist, though, such as:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>one side of history renames x → z, and the other renames some file to |
| x/e, causing the need for the merge to do a transitive rename so that |
| the rename ends up at z/e.</p> |
| </li> |
| <li> |
| <p>one side of history renames x → z, but also renames all files within x. |
| For example, x/a → z/alpha, x/b → z/bravo, etc.</p> |
| </li> |
| <li> |
| <p>both <em>x</em> and <em>y</em> being merged into a single directory <em>z</em>, with a |
| directory rename being detected for both x→z and y→z.</p> |
| </li> |
| <li> |
| <p>not all files in a directory being renamed to the same location; |
| i.e. perhaps most the files in <em>x</em> are now found under <em>z</em>, but a few |
| are found under <em>w</em>.</p> |
| </li> |
| <li> |
| <p>a directory being renamed, which also contained a subdirectory that was |
| renamed to some entirely different location. (And perhaps the inner |
| directory itself contained inner directories that were renamed to yet |
| other locations).</p> |
| </li> |
| <li> |
| <p>combinations of the above; see t/t6423-merge-rename-directories.sh for |
| various interesting cases.</p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_limitationsapplicability_of_directory_renames">Limitations — applicability of directory renames</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>In order to prevent edge and corner cases resulting in either conflicts |
| that cannot be represented in the index or which might be too complex for |
| users to try to understand and resolve, a couple basic rules limit when |
| directory rename detection applies:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>1) If a given directory still exists on both sides of a merge, we do |
| not consider it to have been renamed.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>2) If a subset of to-be-renamed files have a file or directory in the |
| way (or would be in the way of each other), "turn off" the directory |
| rename for those specific sub-paths and report the conflict to the |
| user.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>3) If the other side of history did a directory rename to a path that |
| your side of history renamed away, then ignore that particular |
| rename from the other side of history for any implicit directory |
| renames (but warn the user).</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_limitationsdetailed_rules_and_testcases">Limitations — detailed rules and testcases</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>t/t6423-merge-rename-directories.sh contains extensive tests and commentary |
| which generate and explore the rules listed above. It also lists a few |
| additional rules:</p> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>a) If renames split a directory into two or more others, the directory |
| with the most renames, "wins".</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>b) Only apply implicit directory renames to directories if the other side |
| of history is the one doing the renaming.</pre> |
| </div> |
| </div> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>c) Do not perform directory rename detection for directories which had no |
| new paths added to them.</pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_limitationssupport_in_different_commands">Limitations — support in different commands</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Directory rename detection is supported by <em>merge</em> and <em>cherry-pick</em>. |
| Other git commands which users might be surprised to see limited or no |
| directory rename detection support in:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>diff</p> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Folks have requested in the past that `git diff` detect directory |
| renames and somehow simplify its output. It is not clear whether this |
| would be desirable or how the output should be simplified, so this was |
| simply not implemented. Also, while diffcore-rename has most of the |
| logic for detecting directory renames, some of the logic is still found |
| within merge-ort and merge-recursive. Fully supporting directory |
| rename detection in diffs would require copying or moving the remaining |
| bits of logic to the diff machinery.</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>am</p> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>git-am tries to avoid a full three way merge, instead calling |
| git-apply. That prevents us from detecting renames at all, which may |
| defeat the directory rename detection. There is a fallback, though; if |
| the initial git-apply fails and the user has specified the -3 option, |
| git-am will fall back to a three way merge. However, git-am lacks the |
| necessary information to do a "real" three way merge. Instead, it has |
| to use build_fake_ancestor() to get a merge base that is missing files |
| whose rename may have been important to detect for directory rename |
| detection to function.</pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>rebase</p> |
| <div class="literalblock"> |
| <div class="content"> |
| <pre>Since am-based rebases work by first generating a bunch of patches |
| (which no longer record what the original commits were and thus don't |
| have the necessary info from which we can find a real merge-base), and |
| then calling git-am, this implies that am-based rebases will not always |
| successfully detect directory renames either (see the 'am' section |
| above). merged-based rebases (rebase -m) and cherry-pick-based rebases |
| (rebase -i) are not affected by this shortcoming, and fully support |
| directory rename detection.</pre> |
| </div> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div id="footer"> |
| <div id="footer-text"> |
| Last updated 2025-06-20 18:10:42 -0700 |
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