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-rw-r--r--Documentation/technical/directory-rename-detection.txt23
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/technical/directory-rename-detection.txt b/Documentation/technical/directory-rename-detection.txt
index 6e22920..1c0086e 100644
--- a/Documentation/technical/directory-rename-detection.txt
+++ b/Documentation/technical/directory-rename-detection.txt
@@ -90,3 +90,26 @@ directory rename detection support in:
simply not implemented. Further, to implement this, directory rename
detection logic would need to move from merge-recursive to
diffcore-rename.
+
+ * am
+
+ 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.
+
+ * rebase
+
+ 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.