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diff --git a/third_party/git/t/t3400-rebase.sh b/third_party/git/t/t3400-rebase.sh
new file mode 100755
index 000000000000..40d297599584
--- /dev/null
+++ b/third_party/git/t/t3400-rebase.sh
@@ -0,0 +1,422 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Amos Waterland
+#
+
+test_description='git rebase assorted tests
+
+This test runs git rebase and checks that the author information is not lost
+among other things.
+'
+. ./test-lib.sh
+
+GIT_AUTHOR_NAME=author@name
+GIT_AUTHOR_EMAIL=bogus@email@address
+export GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
+
+test_expect_success 'prepare repository with topic branches' '
+	git config core.logAllRefUpdates true &&
+	echo First >A &&
+	git update-index --add A &&
+	git commit -m "Add A." &&
+	git checkout -b force-3way &&
+	echo Dummy >Y &&
+	git update-index --add Y &&
+	git commit -m "Add Y." &&
+	git checkout -b filemove &&
+	git reset --soft master &&
+	mkdir D &&
+	git mv A D/A &&
+	git commit -m "Move A." &&
+	git checkout -b my-topic-branch master &&
+	echo Second >B &&
+	git update-index --add B &&
+	git commit -m "Add B." &&
+	git checkout -f master &&
+	echo Third >>A &&
+	git update-index A &&
+	git commit -m "Modify A." &&
+	git checkout -b side my-topic-branch &&
+	echo Side >>C &&
+	git add C &&
+	git commit -m "Add C" &&
+	git checkout -f my-topic-branch &&
+	git tag topic
+'
+
+test_expect_success 'rebase on dirty worktree' '
+	echo dirty >>A &&
+	test_must_fail git rebase master
+'
+
+test_expect_success 'rebase on dirty cache' '
+	git add A &&
+	test_must_fail git rebase master
+'
+
+test_expect_success 'rebase against master' '
+	git reset --hard HEAD &&
+	git rebase master
+'
+
+test_expect_success 'rebase sets ORIG_HEAD to pre-rebase state' '
+	git checkout -b orig-head topic &&
+	pre="$(git rev-parse --verify HEAD)" &&
+	git rebase master &&
+	test_cmp_rev "$pre" ORIG_HEAD &&
+	test_cmp_rev ! "$pre" HEAD
+'
+
+test_expect_success 'rebase, with <onto> and <upstream> specified as :/quuxery' '
+	test_when_finished "git branch -D torebase" &&
+	git checkout -b torebase my-topic-branch^ &&
+	upstream=$(git rev-parse ":/Add B") &&
+	onto=$(git rev-parse ":/Add A") &&
+	git rebase --onto $onto $upstream &&
+	git reset --hard my-topic-branch^ &&
+	git rebase --onto ":/Add A" ":/Add B" &&
+	git checkout my-topic-branch
+'
+
+test_expect_success 'the rebase operation should not have destroyed author information' '
+	! (git log | grep "Author:" | grep "<>")
+'
+
+test_expect_success 'the rebase operation should not have destroyed author information (2)' "
+	git log -1 |
+	grep 'Author: $GIT_AUTHOR_NAME <$GIT_AUTHOR_EMAIL>'
+"
+
+test_expect_success 'HEAD was detached during rebase' '
+	test $(git rev-parse HEAD@{1}) != $(git rev-parse my-topic-branch@{1})
+'
+
+test_expect_success 'rebase from ambiguous branch name' '
+	git checkout -b topic side &&
+	git rebase master
+'
+
+test_expect_success 'rebase off of the previous branch using "-"' '
+	git checkout master &&
+	git checkout HEAD^ &&
+	git rebase @{-1} >expect.messages &&
+	git merge-base master HEAD >expect.forkpoint &&
+
+	git checkout master &&
+	git checkout HEAD^ &&
+	git rebase - >actual.messages &&
+	git merge-base master HEAD >actual.forkpoint &&
+
+	test_cmp expect.forkpoint actual.forkpoint &&
+	# the next one is dubious---we may want to say "-",
+	# instead of @{-1}, in the message
+	test_i18ncmp expect.messages actual.messages
+'
+
+test_expect_success 'rebase a single mode change' '
+	git checkout master &&
+	git branch -D topic &&
+	echo 1 >X &&
+	git add X &&
+	test_tick &&
+	git commit -m prepare &&
+	git checkout -b modechange HEAD^ &&
+	echo 1 >X &&
+	git add X &&
+	test_chmod +x A &&
+	test_tick &&
+	git commit -m modechange &&
+	GIT_TRACE=1 git rebase master
+'
+
+test_expect_success 'rebase is not broken by diff.renames' '
+	test_config diff.renames copies &&
+	git checkout filemove &&
+	GIT_TRACE=1 git rebase force-3way
+'
+
+test_expect_success 'setup: recover' '
+	test_might_fail git rebase --abort &&
+	git reset --hard &&
+	git checkout modechange
+'
+
+test_expect_success 'Show verbose error when HEAD could not be detached' '
+	>B &&
+	test_when_finished "rm -f B" &&
+	test_must_fail git rebase topic 2>output.err >output.out &&
+	test_i18ngrep "The following untracked working tree files would be overwritten by checkout:" output.err &&
+	test_i18ngrep B output.err
+'
+
+test_expect_success 'fail when upstream arg is missing and not on branch' '
+	git checkout topic &&
+	test_must_fail git rebase
+'
+
+test_expect_success 'fail when upstream arg is missing and not configured' '
+	git checkout -b no-config topic &&
+	test_must_fail git rebase
+'
+
+test_expect_success 'rebase works with format.useAutoBase' '
+	test_config format.useAutoBase true &&
+	git checkout topic &&
+	git rebase master
+'
+
+test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--merge)' '
+	git checkout -b default-base master &&
+	git checkout -b default topic &&
+	git config branch.default.remote . &&
+	git config branch.default.merge refs/heads/default-base &&
+	git rebase --merge &&
+	git rev-parse --verify default-base >expect &&
+	git rev-parse default~1 >actual &&
+	test_cmp expect actual &&
+	git checkout default-base &&
+	git reset --hard HEAD^ &&
+	git checkout default &&
+	git rebase --merge &&
+	git rev-parse --verify default-base >expect &&
+	git rev-parse default~1 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'default to common base in @{upstream}s reflog if no upstream arg (--apply)' '
+	git checkout -B default-base master &&
+	git checkout -B default topic &&
+	git config branch.default.remote . &&
+	git config branch.default.merge refs/heads/default-base &&
+	git rebase --apply &&
+	git rev-parse --verify default-base >expect &&
+	git rev-parse default~1 >actual &&
+	test_cmp expect actual &&
+	git checkout default-base &&
+	git reset --hard HEAD^ &&
+	git checkout default &&
+	git rebase --apply &&
+	git rev-parse --verify default-base >expect &&
+	git rev-parse default~1 >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'cherry-picked commits and fork-point work together' '
+	git checkout default-base &&
+	echo Amended >A &&
+	git commit -a --no-edit --amend &&
+	test_commit B B &&
+	test_commit new_B B "New B" &&
+	test_commit C C &&
+	git checkout default &&
+	git reset --hard default-base@{4} &&
+	test_commit D D &&
+	git cherry-pick -2 default-base^ &&
+	test_commit final_B B "Final B" &&
+	git rebase &&
+	echo Amended >expect &&
+	test_cmp expect A &&
+	echo "Final B" >expect &&
+	test_cmp expect B &&
+	echo C >expect &&
+	test_cmp expect C &&
+	echo D >expect &&
+	test_cmp expect D
+'
+
+test_expect_success 'rebase --apply -q is quiet' '
+	git checkout -b quiet topic &&
+	git rebase --apply -q master >output.out 2>&1 &&
+	test_must_be_empty output.out
+'
+
+test_expect_success 'rebase --merge -q is quiet' '
+	git checkout -B quiet topic &&
+	git rebase --merge -q master >output.out 2>&1 &&
+	test_must_be_empty output.out
+'
+
+test_expect_success 'Rebase a commit that sprinkles CRs in' '
+	(
+		echo "One" &&
+		echo "TwoQ" &&
+		echo "Three" &&
+		echo "FQur" &&
+		echo "Five"
+	) | q_to_cr >CR &&
+	git add CR &&
+	test_tick &&
+	git commit -a -m "A file with a line with CR" &&
+	git tag file-with-cr &&
+	git checkout HEAD^0 &&
+	git rebase --onto HEAD^^ HEAD^ &&
+	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" = "$(git notes show HEAD)"
+'
+
+test_expect_success 'rebase commit with an ancient timestamp' '
+	git reset --hard &&
+
+	>old.one && git add old.one && test_tick &&
+	git commit --date="@12345 +0400" -m "Old one" &&
+	>old.two && git add old.two && test_tick &&
+	git commit --date="@23456 +0500" -m "Old two" &&
+	>old.three && git add old.three && test_tick &&
+	git commit --date="@34567 +0600" -m "Old three" &&
+
+	git cat-file commit HEAD^^ >actual &&
+	grep "author .* 12345 +0400$" actual &&
+	git cat-file commit HEAD^ >actual &&
+	grep "author .* 23456 +0500$" actual &&
+	git cat-file commit HEAD >actual &&
+	grep "author .* 34567 +0600$" actual &&
+
+	git rebase --onto HEAD^^ HEAD^ &&
+
+	git cat-file commit HEAD >actual &&
+	grep "author .* 34567 +0600$" actual
+'
+
+test_expect_success 'rebase with "From " line in commit message' '
+	git checkout -b preserve-from master~1 &&
+	cat >From_.msg <<EOF &&
+Somebody embedded an mbox in a commit message
+
+This is from so-and-so:
+
+From a@b Mon Sep 17 00:00:00 2001
+From: John Doe <nobody@example.com>
+Date: Sat, 11 Nov 2017 00:00:00 +0000
+Subject: not this message
+
+something
+EOF
+	>From_ &&
+	git add From_ &&
+	git commit -F From_.msg &&
+	git rebase master &&
+	git log -1 --pretty=format:%B >out &&
+	test_cmp From_.msg out
+'
+
+test_expect_success 'rebase --apply and --show-current-patch' '
+	test_create_repo conflict-apply &&
+	(
+		cd conflict-apply &&
+		test_commit init &&
+		echo one >>init.t &&
+		git commit -a -m one &&
+		echo two >>init.t &&
+		git commit -a -m two &&
+		git tag two &&
+		test_must_fail git rebase --apply -f --onto init HEAD^ &&
+		GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr &&
+		grep "show.*$(git rev-parse two)" stderr
+	)
+'
+
+test_expect_success 'rebase --apply and .gitattributes' '
+	test_create_repo attributes &&
+	(
+		cd attributes &&
+		test_commit init &&
+		git config filter.test.clean "sed -e '\''s/smudged/clean/g'\''" &&
+		git config filter.test.smudge "sed -e '\''s/clean/smudged/g'\''" &&
+
+		test_commit second &&
+		git checkout -b test HEAD^ &&
+
+		echo "*.txt filter=test" >.gitattributes &&
+		git add .gitattributes &&
+		test_commit third &&
+
+		echo "This text is smudged." >a.txt &&
+		git add a.txt &&
+		test_commit fourth &&
+
+		git checkout -b removal HEAD^ &&
+		git rm .gitattributes &&
+		git add -u &&
+		test_commit fifth &&
+		git cherry-pick test &&
+
+		git checkout test &&
+		git rebase master &&
+		grep "smudged" a.txt &&
+
+		git checkout removal &&
+		git reset --hard &&
+		git rebase master &&
+		grep "clean" a.txt
+	)
+'
+
+test_expect_success 'rebase--merge.sh and --show-current-patch' '
+	test_create_repo conflict-merge &&
+	(
+		cd conflict-merge &&
+		test_commit init &&
+		echo one >>init.t &&
+		git commit -a -m one &&
+		echo two >>init.t &&
+		git commit -a -m two &&
+		git tag two &&
+		test_must_fail git rebase --merge --onto init HEAD^ &&
+		git rebase --show-current-patch >actual.patch &&
+		GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr &&
+		grep "show.*REBASE_HEAD" stderr &&
+		test "$(git rev-parse REBASE_HEAD)" = "$(git rev-parse two)"
+	)
+'
+
+test_expect_success 'rebase -c rebase.useBuiltin=false warning' '
+	expected="rebase.useBuiltin support has been removed" &&
+
+	# Only warn when the legacy rebase is requested...
+	test_must_fail git -c rebase.useBuiltin=false rebase 2>err &&
+	test_i18ngrep "$expected" err &&
+	test_must_fail env GIT_TEST_REBASE_USE_BUILTIN=false git rebase 2>err &&
+	test_i18ngrep "$expected" err &&
+
+	# ...not when we would have used the built-in anyway
+	test_must_fail git -c rebase.useBuiltin=true rebase 2>err &&
+	test_must_be_empty err &&
+	test_must_fail env GIT_TEST_REBASE_USE_BUILTIN=true git rebase 2>err &&
+	test_must_be_empty err
+'
+
+test_expect_success 'switch to branch checked out here' '
+	git checkout master &&
+	git rebase master master
+'
+
+test_expect_success 'switch to branch not checked out' '
+	git checkout master &&
+	git branch other &&
+	git rebase master other
+'
+
+test_expect_success 'refuse to switch to branch checked out elsewhere' '
+	git checkout master &&
+	git worktree add wt &&
+	test_must_fail git -C wt rebase master master 2>err &&
+	test_i18ngrep "already checked out" err
+'
+
+test_done