[PATCH 06/11] merge-ort: support subtree shifting

From

Elijah Newren via GitGitGadget <gitgitgadget@gmail.com>

Date

Mar 5, 2021, 00:55 UTC

Message-ID

<d04ddabde124c165a1096c1a1d72490b2e399138.1614905738.git.gitgitgadget@gmail.com>

In-Reply-To

<pull.973.git.git.1614905738.gitgitgadget@gmail.com>

From: Elijah Newren <newren@gmail.com>

Signed-off-by: Elijah Newren <newren@gmail.com>
---
 merge-ort.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/merge-ort.c b/merge-ort.c
index c4bd88b9d3db..a998f843a1da 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -3417,6 +3417,23 @@ void merge_finalize(struct merge_options *opt,
 
 /*** Function Grouping: helper functions for merge_incore_*() ***/
 
+static struct tree *shift_tree_object(struct repository *repo,
+				      struct tree *one, struct tree *two,
+				      const char *subtree_shift)
+{
+	struct object_id shifted;
+
+	if (!*subtree_shift) {
+		shift_tree(repo, &one->object.oid, &two->object.oid, &shifted, 0);
+	} else {
+		shift_tree_by(repo, &one->object.oid, &two->object.oid, &shifted,
+			      subtree_shift);
+	}
+	if (oideq(&two->object.oid, &shifted))
+		return two;
+	return lookup_tree(repo, &shifted);
+}
+
 static inline void set_commit_tree(struct commit *c, struct tree *t)
 {
 	c->maybe_tree = t;
@@ -3544,6 +3561,13 @@ static void merge_ort_nonrecursive_internal(struct merge_options *opt,
 {
 	struct object_id working_tree_oid;
 
+	if (opt->subtree_shift) {
+		side2 = shift_tree_object(opt->repo, side1, side2,
+					  opt->subtree_shift);
+		merge_base = shift_tree_object(opt->repo, side1, merge_base,
+					       opt->subtree_shift);
+	}
+
 	trace2_region_enter("merge", "collect_merge_info", opt->repo);
 	if (collect_merge_info(opt, merge_base, side1, side2) != 0) {
 		/*

-- 
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