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api-error-handling.adoc
3.73
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2025-11-17 16:38
api-error-handling.html
35.21
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2026-04-05 23:58
api-index-skel.adoc
432
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api-index.adoc
689
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2026-04-05 23:58
api-index.html
30.43
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api-index.sh
714
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2025-11-17 16:38
api-merge.adoc
1.06
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2025-11-17 16:38
api-merge.html
31.51
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2026-04-05 23:58
api-parse-options.adoc
13.01
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2025-11-17 16:38
api-parse-options.html
49.44
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2026-04-05 23:58
api-path-walk.adoc
3.27
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2025-11-17 16:38
api-path-walk.html
34.28
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2026-04-05 23:58
api-simple-ipc.adoc
4.74
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2025-11-17 16:38
api-simple-ipc.html
35.49
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2026-04-05 23:58
api-trace2.adoc
43.45
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2025-11-17 16:38
api-trace2.html
86.12
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2026-04-05 23:58
bitmap-format.adoc
14.66
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2025-11-17 16:38
bitmap-format.html
49.31
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2026-04-05 23:58
build-systems.adoc
7.96
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2025-11-17 16:38
build-systems.html
41.02
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2026-04-05 23:58
bundle-uri.adoc
26.12
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2025-11-17 16:38
bundle-uri.html
63.08
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2026-04-05 23:58
commit-graph.adoc
17.7
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2025-11-17 16:38
commit-graph.html
52.61
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2026-04-05 23:58
directory-rename-detection.adoc
5.08
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2025-11-17 16:38
directory-rename-detection.html
36.33
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2026-04-05 23:58
hash-function-transition.adoc
35.45
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2025-11-17 16:38
hash-function-transition.html
75.42
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2026-04-05 23:58
large-object-promisors.adoc
26.59
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2025-11-17 16:38
large-object-promisors.html
62.72
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2026-04-05 23:58
long-running-process-protocol.adoc
1.88
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2025-11-17 16:38
long-running-process-protocol.html
32.18
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2026-04-05 23:58
meson.build
1.49
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2025-11-17 16:38
multi-pack-index.adoc
11.31
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2025-11-17 16:38
multi-pack-index.html
44.62
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2026-04-05 23:58
pack-heuristics.adoc
17.62
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2025-11-17 16:38
pack-heuristics.html
54.83
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2026-04-05 23:58
packfile-uri.adoc
3.66
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2025-11-17 16:38
packfile-uri.html
34.64
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2026-04-05 23:58
parallel-checkout.adoc
12.01
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2025-11-17 16:38
parallel-checkout.html
44.27
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2026-04-05 23:58
partial-clone.adoc
14.59
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2025-11-17 16:38
partial-clone.html
48.96
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2026-04-05 23:58
platform-support.adoc
8.95
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platform-support.html
40.71
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2026-04-05 23:58
racy-git.adoc
8.91
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2025-11-17 16:38
racy-git.html
41.04
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2026-04-05 23:58
reftable.adoc
36.65
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2025-11-17 16:38
reftable.html
86.46
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2026-04-05 23:58
remembering-renames.adoc
29.71
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2025-11-17 16:38
remembering-renames.html
65.78
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2026-04-05 23:58
repository-version.adoc
3.19
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2025-11-17 16:38
repository-version.html
33.92
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2026-04-05 23:58
rerere.adoc
6.36
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2025-11-17 16:38
rerere.html
38.33
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2026-04-05 23:58
scalar.adoc
2.87
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2025-11-17 16:38
scalar.html
33.61
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2026-04-05 23:58
send-pack-pipeline.adoc
1.92
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2025-11-17 16:38
send-pack-pipeline.html
32.41
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shallow.adoc
2.49
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2025-11-17 16:38
shallow.html
32.77
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2026-04-05 23:58
sparse-checkout.adoc
46.68
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2025-11-17 16:38
sparse-checkout.html
92.36
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2026-04-05 23:58
sparse-index.adoc
9.28
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2025-11-17 16:38
sparse-index.html
41.79
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2026-04-05 23:58
trivial-merge.adoc
4.16
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2025-11-17 16:38
trivial-merge.html
35.33
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2026-04-05 23:58
unit-tests.adoc
9.8
KB
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2025-11-17 16:38
unit-tests.html
50.73
KB
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2026-04-05 23:58
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.hide-on-print{display:none!important} .print-only{display:block!important} .hide-for-print{display:none!important} .show-for-print{display:inherit!important}} @media print,amzn-kf8{#header>h1:first-child{margin-top:1.25rem} .sect1{padding:0!important} .sect1+.sect1{border:0} #footer{background:none} #footer-text{color:rgba(0,0,0,.6);font-size:.9em}} @media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}} </style> </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 2025-11-17 16:38:17 UTC </div> </div> </body> </html>