rebase: support automatic notes copying

Luckily, all the support already happens to be there.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-am.sh

@@ -780,8 +780,11 @@ do
 	go_next
 done
 
-if test -s "$dotest"/rewritten && test -x "$GIT_DIR"/hooks/post-rewrite; then
+if test -s "$dotest"/rewritten; then
+    git notes copy --for-rewrite=rebase < "$dotest"/rewritten
+    if test -x "$GIT_DIR"/hooks/post-rewrite; then
 	"$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten
+    fi
 fi
 
 git gc --auto

git-rebase--interactive.sh

@@ -570,6 +570,10 @@ do_next () {
 		test ! -f "$DOTEST"/verbose ||
 			git diff-tree --stat $(cat "$DOTEST"/head)..HEAD
 	} &&
+	{
+		git notes copy --for-rewrite=rebase < "$REWRITTEN_LIST" ||
+		true # we don't care if this copying failed
+	} &&
 	if test -x "$GIT_DIR"/hooks/post-rewrite &&
 		test -s "$REWRITTEN_LIST"; then
 		"$GIT_DIR"/hooks/post-rewrite rebase < "$REWRITTEN_LIST"

git-rebase.sh

@@ -154,6 +154,7 @@ move_to_original_branch () {
 
 finish_rb_merge () {
 	move_to_original_branch
+	git notes copy --for-rewrite=rebase < "$dotest"/rewritten
 	if test -x "$GIT_DIR"/hooks/post-rewrite &&
 		test -s "$dotest"/rewritten; then
 		"$GIT_DIR"/hooks/post-rewrite rebase < "$dotest"/rewritten

t/t3400-rebase.sh

@@ -155,4 +155,21 @@ test_expect_success 'Rebase a commit that sprinkles CRs in' '
 	git diff --exit-code file-with-cr:CR HEAD:CR
 '
 
+test_expect_success 'rebase can copy notes' '
+	git config notes.rewrite.rebase true &&
+	git config notes.rewriteRef "refs/notes/*" &&
+	test_commit n1 &&
+	test_commit n2 &&
+	test_commit n3 &&
+	git notes add -m"a note" n3 &&
+	git rebase --onto n1 n2 &&
+	test "a note" = "$(git notes show HEAD)"
+'
+
+test_expect_success 'rebase -m can copy notes' '
+	git reset --hard n3 &&
+	git rebase -m --onto n1 n2 &&
+	test "a note" = "$(git notes show HEAD)"
+'
+
 test_done

t/t3404-rebase-interactive.sh

@@ -553,4 +553,28 @@ test_expect_success 'reword' '
 	git show HEAD~2 | grep "C changed"
 '
 
+test_expect_success 'rebase -i can copy notes' '
+	git config notes.rewrite.rebase true &&
+	git config notes.rewriteRef "refs/notes/*" &&
+	test_commit n1 &&
+	test_commit n2 &&
+	test_commit n3 &&
+	git notes add -m"a note" n3 &&
+	git rebase --onto n1 n2 &&
+	test "a note" = "$(git notes show HEAD)"
+'
+
+cat >expect <<EOF
+an earlier note
+a note
+EOF
+
+test_expect_success 'rebase -i can copy notes over a fixup' '
+	git reset --hard n3 &&
+	git notes add -m"an earlier note" n2 &&
+	GIT_NOTES_REWRITE_MODE=concatenate FAKE_LINES="1 fixup 2" git rebase -i n1 &&
+	git notes show > output &&
+	test_cmp expect output
+'
+
 test_done