Merge branch 'pw/post-commit-from-sequencer'

"rebase -i" ceased to run post-commit hook by mistake in an earlier
update, which has been corrected.

* pw/post-commit-from-sequencer:
  sequencer: run post-commit hook
  move run_commit_hook() to libgit and use it there
  sequencer.h fix placement of #endif
  t3404: remove uneeded calls to set_fake_editor
  t3404: set $EDITOR in subshell
  t3404: remove unnecessary subshell

2 files changed, 396 insertions, 228 deletions

diff --git a/t/lib-rebase.sh b/t/lib-rebase.sh
index 6d87961e41..b72c051f47 100644
--- a/t/lib-rebase.sh
+++ b/t/lib-rebase.sh
@@ -119,3 +119,31 @@ make_empty () {
 	git commit --allow-empty -m "$1" &&
 	git tag "$1"
 }
+
+# Call this (inside test_expect_success) at the end of a test file to
+# check that no tests have changed editor related environment
+# variables or config settings
+test_editor_unchanged () {
+	# We're only interested in exported variables hence 'sh -c'
+	sh -c 'cat >actual <<-EOF
+	EDITOR=$EDITOR
+	FAKE_COMMIT_AMEND=$FAKE_COMMIT_AMEND
+	FAKE_COMMIT_MESSAGE=$FAKE_COMMIT_MESSAGE
+	FAKE_LINES=$FAKE_LINES
+	GIT_EDITOR=$GIT_EDITOR
+	GIT_SEQUENCE_EDITOR=$GIT_SEQUENCE_EDITOR
+	core.editor=$(git config core.editor)
+	sequence.editor=$(git config sequence.editor)
+	EOF'
+	cat >expect <<-\EOF
+	EDITOR=:
+	FAKE_COMMIT_AMEND=
+	FAKE_COMMIT_MESSAGE=
+	FAKE_LINES=
+	GIT_EDITOR=
+	GIT_SEQUENCE_EDITOR=
+	core.editor=
+	sequence.editor=
+	EOF
+	test_cmp expect actual
+}
diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index d2dfbe46b9..bf0dc756d2 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -76,8 +76,11 @@ test_expect_success 'rebase -i with empty HEAD' '
 	cat >expect <<-\EOF &&
 	error: nothing to do
 	EOF
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 exec_true" git rebase -i HEAD^ >actual 2>&1 &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 exec_true" \
+			git rebase -i HEAD^ >actual 2>&1
+	) &&
 	test_i18ncmp expect actual
 '
 
@@ -136,8 +139,11 @@ test_expect_success 'rebase -i sets work tree properly' '
 
 test_expect_success 'rebase -i with the exec command checks tree cleanness' '
 	git checkout master &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="exec_echo_foo_>file1 1" git rebase -i HEAD^ &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="exec_echo_foo_>file1 1" \
+			git rebase -i HEAD^
+	) &&
 	test_cmp_rev master^ HEAD &&
 	git reset --hard &&
 	git rebase --continue
@@ -163,9 +169,11 @@ test_expect_success 'rebase -x with newline in command fails' '
 test_expect_success 'rebase -i with exec of inexistent command' '
 	git checkout master &&
 	test_when_finished "git rebase --abort" &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="exec_this-command-does-not-exist 1" \
-	git rebase -i HEAD^ >actual 2>&1 &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="exec_this-command-does-not-exist 1" \
+			git rebase -i HEAD^ >actual 2>&1
+	) &&
 	! grep "Maybe git-rebase is broken" actual
 '
 
@@ -176,7 +184,6 @@ test_expect_success 'implicit interactive rebase does not invoke sequence editor
 
 test_expect_success 'no changes are a nop' '
 	git checkout branch2 &&
-	set_fake_editor &&
 	git rebase -i F &&
 	test "$(git symbolic-ref -q HEAD)" = "refs/heads/branch2" &&
 	test $(git rev-parse I) = $(git rev-parse HEAD)
@@ -186,7 +193,6 @@ test_expect_success 'test the [branch] option' '
 	git checkout -b dead-end &&
 	git rm file6 &&
 	git commit -m "stop here" &&
-	set_fake_editor &&
 	git rebase -i F branch2 &&
 	test "$(git symbolic-ref -q HEAD)" = "refs/heads/branch2" &&
 	test $(git rev-parse I) = $(git rev-parse branch2) &&
@@ -195,7 +201,6 @@ test_expect_success 'test the [branch] option' '
 
 test_expect_success 'test --onto <branch>' '
 	git checkout -b test-onto branch2 &&
-	set_fake_editor &&
 	git rebase -i --onto branch1 F &&
 	test "$(git symbolic-ref -q HEAD)" = "refs/heads/test-onto" &&
 	test $(git rev-parse HEAD^) = $(git rev-parse branch1) &&
@@ -205,7 +210,6 @@ test_expect_success 'test --onto <branch>' '
 test_expect_success 'rebase on top of a non-conflicting commit' '
 	git checkout branch1 &&
 	git tag original-branch1 &&
-	set_fake_editor &&
 	git rebase -i branch2 &&
 	test file6 = $(git diff --name-only original-branch1) &&
 	test "$(git symbolic-ref -q HEAD)" = "refs/heads/branch1" &&
@@ -225,8 +229,10 @@ test_expect_success 'reflog for the branch shows correct finish message' '
 '
 
 test_expect_success 'exchange two commits' '
-	set_fake_editor &&
-	FAKE_LINES="2 1" git rebase -i HEAD~2 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="2 1" git rebase -i HEAD~2
+	) &&
 	test H = $(git cat-file commit HEAD^ | sed -ne \$p) &&
 	test G = $(git cat-file commit HEAD | sed -ne \$p) &&
 	blob1=$(git rev-parse --short HEAD^:file1) &&
@@ -252,7 +258,6 @@ test_expect_success 'stop on conflicting pick' '
 	>>>>>>> $commit... G
 	EOF
 	git tag new-branch1 &&
-	set_fake_editor &&
 	test_must_fail git rebase -i master &&
 	test "$(git rev-parse HEAD~3)" = "$(git rev-parse master)" &&
 	test_cmp expect .git/rebase-merge/patch &&
@@ -281,7 +286,6 @@ test_expect_success 'abort' '
 test_expect_success 'abort with error when new base cannot be checked out' '
 	git rm --cached file1 &&
 	git commit -m "remove file in base" &&
-	set_fake_editor &&
 	test_must_fail git rebase -i master > output 2>&1 &&
 	test_i18ngrep "The following untracked working tree files would be overwritten by checkout:" \
 		output &&
@@ -296,7 +300,6 @@ test_expect_success 'retain authorship' '
 	test_tick &&
 	GIT_AUTHOR_NAME="Twerp Snog" git commit -m "different author" &&
 	git tag twerp &&
-	set_fake_editor &&
 	git rebase -i --onto master HEAD^ &&
 	git show HEAD | grep "^Author: Twerp Snog"
 '
@@ -314,7 +317,6 @@ test_expect_success 'retain authorship w/ conflicts' '
 	test_commit b conflict b conflict-b &&
 	GIT_AUTHOR_NAME=$oGIT_AUTHOR_NAME &&
 
-	set_fake_editor &&
 	test_must_fail git rebase -i conflict-a &&
 	echo resolved >conflict &&
 	git add conflict &&
@@ -330,9 +332,11 @@ test_expect_success 'squash' '
 	test_tick &&
 	GIT_AUTHOR_NAME="Nitfol" git commit -m "nitfol" file7 &&
 	echo "******************************" &&
-	set_fake_editor &&
-	FAKE_LINES="1 squash 2" EXPECT_HEADER_COUNT=2 \
-		git rebase -i --onto master HEAD~2 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 squash 2" EXPECT_HEADER_COUNT=2 \
+			git rebase -i --onto master HEAD~2
+	) &&
 	test B = $(cat file7) &&
 	test $(git rev-parse HEAD^) = $(git rev-parse master)
 '
@@ -343,7 +347,6 @@ test_expect_success 'retain authorship when squashing' '
 
 test_expect_success REBASE_P '-p handles "no changes" gracefully' '
 	HEAD=$(git rev-parse HEAD) &&
-	set_fake_editor &&
 	git rebase -i -p HEAD^ &&
 	git update-index --refresh &&
 	git diff-files --quiet &&
@@ -353,8 +356,10 @@ test_expect_success REBASE_P '-p handles "no changes" gracefully' '
 
 test_expect_failure REBASE_P 'exchange two commits with -p' '
 	git checkout H &&
-	set_fake_editor &&
-	FAKE_LINES="2 1" git rebase -i -p HEAD~2 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="2 1" git rebase -i -p HEAD~2
+	) &&
 	test H = $(git cat-file commit HEAD^ | sed -ne \$p) &&
 	test G = $(git cat-file commit HEAD | sed -ne \$p)
 '
@@ -388,7 +393,6 @@ test_expect_success REBASE_P 'preserve merges with -p' '
 	git commit -m M file1 &&
 	git checkout -b to-be-rebased &&
 	test_tick &&
-	set_fake_editor &&
 	git rebase -i -p --onto branch1 master &&
 	git update-index --refresh &&
 	git diff-files --quiet &&
@@ -403,8 +407,10 @@ test_expect_success REBASE_P 'preserve merges with -p' '
 '
 
 test_expect_success REBASE_P 'edit ancestor with -p' '
-	set_fake_editor &&
-	FAKE_LINES="1 2 edit 3 4" git rebase -i -p HEAD~3 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 2 edit 3 4" git rebase -i -p HEAD~3
+	) &&
 	echo 2 > unrelated-file &&
 	test_tick &&
 	git commit -m L2-modified --amend unrelated-file &&
@@ -418,11 +424,13 @@ test_expect_success REBASE_P 'edit ancestor with -p' '
 test_expect_success '--continue tries to commit' '
 	git reset --hard D &&
 	test_tick &&
-	set_fake_editor &&
-	test_must_fail git rebase -i --onto new-branch1 HEAD^ &&
-	echo resolved > file1 &&
-	git add file1 &&
-	FAKE_COMMIT_MESSAGE="chouette!" git rebase --continue &&
+	(
+		set_fake_editor &&
+		test_must_fail git rebase -i --onto new-branch1 HEAD^ &&
+		echo resolved > file1 &&
+		git add file1 &&
+		FAKE_COMMIT_MESSAGE="chouette!" git rebase --continue
+	) &&
 	test $(git rev-parse HEAD^) = $(git rev-parse new-branch1) &&
 	git show HEAD | grep chouette
 '
@@ -430,7 +438,6 @@ test_expect_success '--continue tries to commit' '
 test_expect_success 'verbose flag is heeded, even after --continue' '
 	git reset --hard master@{1} &&
 	test_tick &&
-	set_fake_editor &&
 	test_must_fail git rebase -v -i --onto new-branch1 HEAD^ &&
 	echo resolved > file1 &&
 	git add file1 &&
@@ -440,10 +447,13 @@ test_expect_success 'verbose flag is heeded, even after --continue' '
 
 test_expect_success C_LOCALE_OUTPUT 'multi-squash only fires up editor once' '
 	base=$(git rev-parse HEAD~4) &&
-	set_fake_editor &&
-	FAKE_COMMIT_AMEND="ONCE" FAKE_LINES="1 squash 2 squash 3 squash 4" \
-		EXPECT_HEADER_COUNT=4 \
-		git rebase -i $base &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="ONCE" \
+			FAKE_LINES="1 squash 2 squash 3 squash 4" \
+			EXPECT_HEADER_COUNT=4 \
+			git rebase -i $base
+	) &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 1 = $(git show | grep ONCE | wc -l)
 '
@@ -451,9 +461,12 @@ test_expect_success C_LOCALE_OUTPUT 'multi-squash only fires up editor once' '
 test_expect_success C_LOCALE_OUTPUT 'multi-fixup does not fire up editor' '
 	git checkout -b multi-fixup E &&
 	base=$(git rev-parse HEAD~4) &&
-	set_fake_editor &&
-	FAKE_COMMIT_AMEND="NEVER" FAKE_LINES="1 fixup 2 fixup 3 fixup 4" \
-		git rebase -i $base &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="NEVER" \
+			FAKE_LINES="1 fixup 2 fixup 3 fixup 4" \
+			git rebase -i $base
+	) &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 0 = $(git show | grep NEVER | wc -l) &&
 	git checkout @{-1} &&
@@ -463,12 +476,15 @@ test_expect_success C_LOCALE_OUTPUT 'multi-fixup does not fire up editor' '
 test_expect_success 'commit message used after conflict' '
 	git checkout -b conflict-fixup conflict-branch &&
 	base=$(git rev-parse HEAD~4) &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 fixup 3 fixup 4" git rebase -i $base &&
-	echo three > conflict &&
-	git add conflict &&
-	FAKE_COMMIT_AMEND="ONCE" EXPECT_HEADER_COUNT=2 \
-		git rebase --continue &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 fixup 3 fixup 4" \
+			git rebase -i $base &&
+		echo three > conflict &&
+		git add conflict &&
+		FAKE_COMMIT_AMEND="ONCE" EXPECT_HEADER_COUNT=2 \
+			git rebase --continue
+	) &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 1 = $(git show | grep ONCE | wc -l) &&
 	git checkout @{-1} &&
@@ -478,12 +494,15 @@ test_expect_success 'commit message used after conflict' '
 test_expect_success 'commit message retained after conflict' '
 	git checkout -b conflict-squash conflict-branch &&
 	base=$(git rev-parse HEAD~4) &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 fixup 3 squash 4" git rebase -i $base &&
-	echo three > conflict &&
-	git add conflict &&
-	FAKE_COMMIT_AMEND="TWICE" EXPECT_HEADER_COUNT=2 \
-		git rebase --continue &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 fixup 3 squash 4" \
+			git rebase -i $base &&
+		echo three > conflict &&
+		git add conflict &&
+		FAKE_COMMIT_AMEND="TWICE" EXPECT_HEADER_COUNT=2 \
+			git rebase --continue
+	) &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 2 = $(git show | grep TWICE | wc -l) &&
 	git checkout @{-1} &&
@@ -500,10 +519,13 @@ test_expect_success C_LOCALE_OUTPUT 'squash and fixup generate correct log messa
 	EOF
 	git checkout -b squash-fixup E &&
 	base=$(git rev-parse HEAD~4) &&
-	set_fake_editor &&
-	FAKE_COMMIT_AMEND="ONCE" FAKE_LINES="1 fixup 2 squash 3 fixup 4" \
-		EXPECT_HEADER_COUNT=4 \
-		git rebase -i $base &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="ONCE" \
+			FAKE_LINES="1 fixup 2 squash 3 fixup 4" \
+			EXPECT_HEADER_COUNT=4 \
+			git rebase -i $base
+	) &&
 	git cat-file commit HEAD | sed -e 1,/^\$/d > actual-squash-fixup &&
 	test_cmp expect-squash-fixup actual-squash-fixup &&
 	git cat-file commit HEAD@{2} |
@@ -517,10 +539,13 @@ test_expect_success C_LOCALE_OUTPUT 'squash and fixup generate correct log messa
 test_expect_success C_LOCALE_OUTPUT 'squash ignores comments' '
 	git checkout -b skip-comments E &&
 	base=$(git rev-parse HEAD~4) &&
-	set_fake_editor &&
-	FAKE_COMMIT_AMEND="ONCE" FAKE_LINES="# 1 # squash 2 # squash 3 # squash 4 #" \
-		EXPECT_HEADER_COUNT=4 \
-		git rebase -i $base &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="ONCE" \
+			FAKE_LINES="# 1 # squash 2 # squash 3 # squash 4 #" \
+			EXPECT_HEADER_COUNT=4 \
+			git rebase -i $base
+	) &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 1 = $(git show | grep ONCE | wc -l) &&
 	git checkout @{-1} &&
@@ -530,10 +555,13 @@ test_expect_success C_LOCALE_OUTPUT 'squash ignores comments' '
 test_expect_success C_LOCALE_OUTPUT 'squash ignores blank lines' '
 	git checkout -b skip-blank-lines E &&
 	base=$(git rev-parse HEAD~4) &&
-	set_fake_editor &&
-	FAKE_COMMIT_AMEND="ONCE" FAKE_LINES="> 1 > squash 2 > squash 3 > squash 4 >" \
-		EXPECT_HEADER_COUNT=4 \
-		git rebase -i $base &&
+	(
+		set_fake_editor &&
+		FAKE_COMMIT_AMEND="ONCE" \
+			FAKE_LINES="> 1 > squash 2 > squash 3 > squash 4 >" \
+			EXPECT_HEADER_COUNT=4 \
+			git rebase -i $base
+	) &&
 	test $base = $(git rev-parse HEAD^) &&
 	test 1 = $(git show | grep ONCE | wc -l) &&
 	git checkout @{-1} &&
@@ -543,17 +571,21 @@ test_expect_success C_LOCALE_OUTPUT 'squash ignores blank lines' '
 test_expect_success 'squash works as expected' '
 	git checkout -b squash-works no-conflict-branch &&
 	one=$(git rev-parse HEAD~3) &&
-	set_fake_editor &&
-	FAKE_LINES="1 s 3 2" EXPECT_HEADER_COUNT=2 \
-		git rebase -i HEAD~3 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 s 3 2" EXPECT_HEADER_COUNT=2 git rebase -i HEAD~3
+	) &&
 	test $one = $(git rev-parse HEAD~2)
 '
 
 test_expect_success 'interrupted squash works as expected' '
 	git checkout -b interrupted-squash conflict-branch &&
 	one=$(git rev-parse HEAD~3) &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 squash 3 2" git rebase -i HEAD~3 &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 squash 3 2" \
+			git rebase -i HEAD~3
+	) &&
 	test_write_lines one two four > conflict &&
 	git add conflict &&
 	test_must_fail git rebase --continue &&
@@ -566,8 +598,11 @@ test_expect_success 'interrupted squash works as expected' '
 test_expect_success 'interrupted squash works as expected (case 2)' '
 	git checkout -b interrupted-squash2 conflict-branch &&
 	one=$(git rev-parse HEAD~3) &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="3 squash 1 2" git rebase -i HEAD~3 &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="3 squash 1 2" \
+			git rebase -i HEAD~3
+	) &&
 	test_write_lines one four > conflict &&
 	git add conflict &&
 	test_must_fail git rebase --continue &&
@@ -587,11 +622,13 @@ test_expect_success '--continue tries to commit, even for "edit"' '
 	git commit -m "unrelated change" &&
 	parent=$(git rev-parse HEAD^) &&
 	test_tick &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1" git rebase -i HEAD^ &&
-	echo edited > file7 &&
-	git add file7 &&
-	FAKE_COMMIT_MESSAGE="chouette!" git rebase --continue &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1" git rebase -i HEAD^ &&
+		echo edited > file7 &&
+		git add file7 &&
+		FAKE_COMMIT_MESSAGE="chouette!" git rebase --continue
+	) &&
 	test edited = $(git show HEAD:file7) &&
 	git show HEAD | grep chouette &&
 	test $parent = $(git rev-parse HEAD^)
@@ -600,34 +637,41 @@ test_expect_success '--continue tries to commit, even for "edit"' '
 test_expect_success 'aborted --continue does not squash commits after "edit"' '
 	old=$(git rev-parse HEAD) &&
 	test_tick &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1" git rebase -i HEAD^ &&
-	echo "edited again" > file7 &&
-	git add file7 &&
-	test_must_fail env FAKE_COMMIT_MESSAGE=" " git rebase --continue &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1" git rebase -i HEAD^ &&
+		echo "edited again" > file7 &&
+		git add file7 &&
+		test_must_fail env FAKE_COMMIT_MESSAGE=" " git rebase --continue
+	) &&
 	test $old = $(git rev-parse HEAD) &&
 	git rebase --abort
 '
 
 test_expect_success 'auto-amend only edited commits after "edit"' '
 	test_tick &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1" git rebase -i HEAD^ &&
-	echo "edited again" > file7 &&
-	git add file7 &&
-	FAKE_COMMIT_MESSAGE="edited file7 again" git commit &&
-	echo "and again" > file7 &&
-	git add file7 &&
-	test_tick &&
-	test_must_fail env FAKE_COMMIT_MESSAGE="and again" git rebase --continue &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1" git rebase -i HEAD^ &&
+		echo "edited again" > file7 &&
+		git add file7 &&
+		FAKE_COMMIT_MESSAGE="edited file7 again" git commit &&
+		echo "and again" > file7 &&
+		git add file7 &&
+		test_tick &&
+		test_must_fail env FAKE_COMMIT_MESSAGE="and again" \
+			git rebase --continue
+	) &&
 	git rebase --abort
 '
 
 test_expect_success 'clean error after failed "exec"' '
 	test_tick &&
 	test_when_finished "git rebase --abort || :" &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 exec_false" git rebase -i HEAD^ &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 exec_false" git rebase -i HEAD^
+	) &&
 	echo "edited again" > file7 &&
 	git add file7 &&
 	test_must_fail git rebase --continue 2>error &&
@@ -638,8 +682,10 @@ test_expect_success 'rebase a detached HEAD' '
 	grandparent=$(git rev-parse HEAD~2) &&
 	git checkout $(git rev-parse HEAD) &&
 	test_tick &&
-	set_fake_editor &&
-	FAKE_LINES="2 1" git rebase -i HEAD~2 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="2 1" git rebase -i HEAD~2
+	) &&
 	test $grandparent = $(git rev-parse HEAD~2)
 '
 
@@ -654,9 +700,10 @@ test_expect_success 'rebase a commit violating pre-commit' '
 	test_must_fail git commit -m doesnt-verify file1 &&
 	git commit -m doesnt-verify --no-verify file1 &&
 	test_tick &&
-	set_fake_editor &&
-	FAKE_LINES=2 git rebase -i HEAD~2
-
+	(
+		set_fake_editor &&
+		FAKE_LINES=2 git rebase -i HEAD~2
+	)
 '
 
 test_expect_success 'rebase with a file named HEAD in worktree' '
@@ -676,8 +723,10 @@ test_expect_success 'rebase with a file named HEAD in worktree' '
 		git commit -m "Add body"
 	) &&
 
-	set_fake_editor &&
-	FAKE_LINES="1 squash 2" git rebase -i @{-1} &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 squash 2" git rebase -i @{-1}
+	) &&
 	test "$(git show -s --pretty=format:%an)" = "Squashed Away"
 
 '
@@ -688,7 +737,6 @@ test_expect_success 'do "noop" when there is nothing to cherry-pick' '
 	GIT_EDITOR=: git commit --amend \
 		--author="Somebody else <somebody@else.com>" &&
 	test $(git rev-parse branch3) != $(git rev-parse branch4) &&
-	set_fake_editor &&
 	git rebase -i branch3 &&
 	test $(git rev-parse branch3) = $(git rev-parse branch4)
 
@@ -713,13 +761,14 @@ test_expect_success 'submodule rebase setup' '
 		git commit -a -m "submodule second"
 	) &&
 	test_tick &&
-	set_fake_editor &&
 	git commit -a -m "Three changes submodule"
 '
 
 test_expect_success 'submodule rebase -i' '
-	set_fake_editor &&
-	FAKE_LINES="1 squash 2 3" git rebase -i A
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 squash 2 3" git rebase -i A
+	)
 '
 
 test_expect_success 'submodule conflict setup' '
@@ -736,7 +785,6 @@ test_expect_success 'submodule conflict setup' '
 '
 
 test_expect_success 'rebase -i continue with only submodule staged' '
-	set_fake_editor &&
 	test_must_fail git rebase -i submodule-base &&
 	git add sub &&
 	git rebase --continue &&
@@ -746,7 +794,6 @@ test_expect_success 'rebase -i continue with only submodule staged' '
 test_expect_success 'rebase -i continue with unstaged submodule' '
 	git checkout submodule-topic &&
 	git reset --hard &&
-	set_fake_editor &&
 	test_must_fail git rebase -i submodule-base &&
 	git reset &&
 	git rebase --continue &&
@@ -759,7 +806,6 @@ test_expect_success 'avoid unnecessary reset' '
 	test-tool chmtime =123456789 file3 &&
 	git update-index --refresh &&
 	HEAD=$(git rev-parse HEAD) &&
-	set_fake_editor &&
 	git rebase -i HEAD~4 &&
 	test $HEAD = $(git rev-parse HEAD) &&
 	MTIME=$(test-tool chmtime --get file3) &&
@@ -768,16 +814,22 @@ test_expect_success 'avoid unnecessary reset' '
 
 test_expect_success 'reword' '
 	git checkout -b reword-branch master &&
-	set_fake_editor &&
-	FAKE_LINES="1 2 3 reword 4" FAKE_COMMIT_MESSAGE="E changed" git rebase -i A &&
-	git show HEAD | grep "E changed" &&
-	test $(git rev-parse master) != $(git rev-parse HEAD) &&
-	test $(git rev-parse master^) = $(git rev-parse HEAD^) &&
-	FAKE_LINES="1 2 reword 3 4" FAKE_COMMIT_MESSAGE="D changed" git rebase -i A &&
-	git show HEAD^ | grep "D changed" &&
-	FAKE_LINES="reword 1 2 3 4" FAKE_COMMIT_MESSAGE="B changed" git rebase -i A &&
-	git show HEAD~3 | grep "B changed" &&
-	FAKE_LINES="1 r 2 pick 3 p 4" FAKE_COMMIT_MESSAGE="C changed" git rebase -i A &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 2 3 reword 4" FAKE_COMMIT_MESSAGE="E changed" \
+			git rebase -i A &&
+		git show HEAD | grep "E changed" &&
+		test $(git rev-parse master) != $(git rev-parse HEAD) &&
+		test $(git rev-parse master^) = $(git rev-parse HEAD^) &&
+		FAKE_LINES="1 2 reword 3 4" FAKE_COMMIT_MESSAGE="D changed" \
+			git rebase -i A &&
+		git show HEAD^ | grep "D changed" &&
+		FAKE_LINES="reword 1 2 3 4" FAKE_COMMIT_MESSAGE="B changed" \
+			git rebase -i A &&
+		git show HEAD~3 | grep "B changed" &&
+		FAKE_LINES="1 r 2 pick 3 p 4" FAKE_COMMIT_MESSAGE="C changed" \
+			git rebase -i A
+	) &&
 	git show HEAD~2 | grep "C changed"
 '
 
@@ -788,7 +840,6 @@ test_expect_success 'rebase -i can copy notes' '
 	test_commit n2 &&
 	test_commit n3 &&
 	git notes add -m"a note" n3 &&
-	set_fake_editor &&
 	git rebase -i --onto n1 n2 &&
 	test "a note" = "$(git notes show HEAD)"
 '
@@ -801,8 +852,11 @@ test_expect_success 'rebase -i can copy notes over a fixup' '
 	EOF
 	git reset --hard n3 &&
 	git notes add -m"an earlier note" n2 &&
-	set_fake_editor &&
-	GIT_NOTES_REWRITE_MODE=concatenate FAKE_LINES="1 f 2" git rebase -i n1 &&
+	(
+		set_fake_editor &&
+		GIT_NOTES_REWRITE_MODE=concatenate FAKE_LINES="1 f 2" \
+			git rebase -i n1
+	) &&
 	git notes show > output &&
 	test_cmp expect output
 '
@@ -811,8 +865,10 @@ test_expect_success 'rebase while detaching HEAD' '
 	git symbolic-ref HEAD &&
 	grandparent=$(git rev-parse HEAD~2) &&
 	test_tick &&
-	set_fake_editor &&
-	FAKE_LINES="2 1" git rebase -i HEAD~2 HEAD^0 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="2 1" git rebase -i HEAD~2 HEAD^0
+	) &&
 	test $grandparent = $(git rev-parse HEAD~2) &&
 	test_must_fail git symbolic-ref HEAD
 '
@@ -821,7 +877,6 @@ test_tick # Ensure that the rebased commits get a different timestamp.
 test_expect_success 'always cherry-pick with --no-ff' '
 	git checkout no-ff-branch &&
 	git tag original-no-ff-branch &&
-	set_fake_editor &&
 	git rebase -i --no-ff A &&
 	for p in 0 1 2
 	do
@@ -853,8 +908,10 @@ test_expect_success 'set up commits with funny messages' '
 test_expect_success 'rebase-i history with funny messages' '
 	git rev-list A..funny >expect &&
 	test_tick &&
-	set_fake_editor &&
-	FAKE_LINES="1 2 3 4" git rebase -i A &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 2 3 4" git rebase -i A
+	) &&
 	git rev-list A.. >actual &&
 	test_cmp expect actual
 '
@@ -868,9 +925,9 @@ test_expect_success 'prepare for rebase -i --exec' '
 '
 
 test_expect_success 'running "git rebase -i --exec git show HEAD"' '
-	set_fake_editor &&
-	git rebase -i --exec "git show HEAD" HEAD~2 >actual &&
 	(
+		set_fake_editor &&
+		git rebase -i --exec "git show HEAD" HEAD~2 >actual &&
 		FAKE_LINES="1 exec_git_show_HEAD 2 exec_git_show_HEAD" &&
 		export FAKE_LINES &&
 		git rebase -i HEAD~2 >expect
@@ -881,9 +938,9 @@ test_expect_success 'running "git rebase -i --exec git show HEAD"' '
 
 test_expect_success 'running "git rebase --exec git show HEAD -i"' '
 	git reset --hard execute &&
-	set_fake_editor &&
-	git rebase --exec "git show HEAD" -i HEAD~2 >actual &&
 	(
+		set_fake_editor &&
+		git rebase --exec "git show HEAD" -i HEAD~2 >actual &&
 		FAKE_LINES="1 exec_git_show_HEAD 2 exec_git_show_HEAD" &&
 		export FAKE_LINES &&
 		git rebase -i HEAD~2 >expect
@@ -894,9 +951,9 @@ test_expect_success 'running "git rebase --exec git show HEAD -i"' '
 
 test_expect_success 'running "git rebase -ix git show HEAD"' '
 	git reset --hard execute &&
-	set_fake_editor &&
-	git rebase -ix "git show HEAD" HEAD~2 >actual &&
 	(
+		set_fake_editor &&
+		git rebase -ix "git show HEAD" HEAD~2 >actual &&
 		FAKE_LINES="1 exec_git_show_HEAD 2 exec_git_show_HEAD" &&
 		export FAKE_LINES &&
 		git rebase -i HEAD~2 >expect
@@ -908,9 +965,9 @@ test_expect_success 'running "git rebase -ix git show HEAD"' '
 
 test_expect_success 'rebase -ix with several <CMD>' '
 	git reset --hard execute &&
-	set_fake_editor &&
-	git rebase -ix "git show HEAD; pwd" HEAD~2 >actual &&
 	(
+		set_fake_editor &&
+		git rebase -ix "git show HEAD; pwd" HEAD~2 >actual &&
 		FAKE_LINES="1 exec_git_show_HEAD;_pwd 2 exec_git_show_HEAD;_pwd" &&
 		export FAKE_LINES &&
 		git rebase -i HEAD~2 >expect
@@ -921,9 +978,9 @@ test_expect_success 'rebase -ix with several <CMD>' '
 
 test_expect_success 'rebase -ix with several instances of --exec' '
 	git reset --hard execute &&
-	set_fake_editor &&
-	git rebase -i --exec "git show HEAD" --exec "pwd" HEAD~2 >actual &&
 	(
+		set_fake_editor &&
+		git rebase -i --exec "git show HEAD" --exec "pwd" HEAD~2 >actual &&
 		FAKE_LINES="1 exec_git_show_HEAD exec_pwd 2
 				exec_git_show_HEAD exec_pwd" &&
 		export FAKE_LINES &&
@@ -942,13 +999,11 @@ test_expect_success C_LOCALE_OUTPUT 'rebase -ix with --autosquash' '
 	echo bis >bis.txt &&
 	git add bis.txt &&
 	git commit -m "fixup! two_exec" &&
-	set_fake_editor &&
-	(
-		git checkout -b autosquash_actual &&
-		git rebase -i --exec "git show HEAD" --autosquash HEAD~4 >actual
-	) &&
+	git checkout -b autosquash_actual &&
+	git rebase -i --exec "git show HEAD" --autosquash HEAD~4 >actual &&
 	git checkout autosquash &&
 	(
+		set_fake_editor &&
 		git checkout -b autosquash_expected &&
 		FAKE_LINES="1 fixup 3 fixup 4 exec_git_show_HEAD 2 exec_git_show_HEAD" &&
 		export FAKE_LINES &&
@@ -969,7 +1024,6 @@ test_expect_success 'rebase --exec works without -i ' '
 
 test_expect_success 'rebase -i --exec without <CMD>' '
 	git reset --hard execute &&
-	set_fake_editor &&
 	test_must_fail git rebase -i --exec 2>actual &&
 	test_i18ngrep "requires a value" actual &&
 	git checkout master
@@ -977,8 +1031,10 @@ test_expect_success 'rebase -i --exec without <CMD>' '
 
 test_expect_success 'rebase -i --root re-order and drop commits' '
 	git checkout E &&
-	set_fake_editor &&
-	FAKE_LINES="3 1 2 5" git rebase -i --root &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="3 1 2 5" git rebase -i --root
+	) &&
 	test E = $(git cat-file commit HEAD | sed -ne \$p) &&
 	test B = $(git cat-file commit HEAD^ | sed -ne \$p) &&
 	test A = $(git cat-file commit HEAD^^ | sed -ne \$p) &&
@@ -991,24 +1047,30 @@ test_expect_success 'rebase -i --root retain root commit author and message' '
 	echo B >file7 &&
 	git add file7 &&
 	GIT_AUTHOR_NAME="Twerp Snog" git commit -m "different author" &&
-	set_fake_editor &&
-	FAKE_LINES="2" git rebase -i --root &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="2" git rebase -i --root
+	) &&
 	git cat-file commit HEAD | grep -q "^author Twerp Snog" &&
 	git cat-file commit HEAD | grep -q "^different author$"
 '
 
 test_expect_success 'rebase -i --root temporary sentinel commit' '
 	git checkout B &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="2" git rebase -i --root &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="2" git rebase -i --root
+	) &&
 	git cat-file commit HEAD | grep "^tree $EMPTY_TREE" &&
 	git rebase --abort
 '
 
 test_expect_success 'rebase -i --root fixup root commit' '
 	git checkout B &&
-	set_fake_editor &&
-	FAKE_LINES="1 fixup 2" git rebase -i --root &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 fixup 2" git rebase -i --root
+	) &&
 	test A = $(git cat-file commit HEAD | sed -ne \$p) &&
 	test B = $(git show HEAD:file1) &&
 	test 0 = $(git cat-file commit HEAD | grep -c ^parent\ )
@@ -1017,9 +1079,11 @@ test_expect_success 'rebase -i --root fixup root commit' '
 test_expect_success 'rebase -i --root reword original root commit' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout -b reword-original-root-branch master &&
-	set_fake_editor &&
-	FAKE_LINES="reword 1 2" FAKE_COMMIT_MESSAGE="A changed" \
-	git rebase -i --root &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="reword 1 2" FAKE_COMMIT_MESSAGE="A changed" \
+			git rebase -i --root
+	) &&
 	git show HEAD^ | grep "A changed" &&
 	test -z "$(git show -s --format=%p HEAD^)"
 '
@@ -1027,9 +1091,11 @@ test_expect_success 'rebase -i --root reword original root commit' '
 test_expect_success 'rebase -i --root reword new root commit' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	git checkout -b reword-now-root-branch master &&
-	set_fake_editor &&
-	FAKE_LINES="reword 3 1" FAKE_COMMIT_MESSAGE="C changed" \
-	git rebase -i --root &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="reword 3 1" FAKE_COMMIT_MESSAGE="C changed" \
+		git rebase -i --root
+	) &&
 	git show HEAD^ | grep "C changed" &&
 	test -z "$(git show -s --format=%p HEAD^)"
 '
@@ -1041,8 +1107,10 @@ test_expect_success 'rebase -i --root when root has untracked file conflict' '
 	git rm file1 &&
 	git commit -m "remove file 1 add file 2" &&
 	echo z >file1 &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 2" git rebase -i --root &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 2" git rebase -i --root
+	) &&
 	rm file1 &&
 	git rebase --continue &&
 	test "$(git log -1 --format=%B)" = "remove file 1 add file 2" &&
@@ -1052,11 +1120,13 @@ test_expect_success 'rebase -i --root when root has untracked file conflict' '
 test_expect_success 'rebase -i --root reword root when root has untracked file conflict' '
 	test_when_finished "reset_rebase" &&
 	echo z>file1 &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="reword 1 2" \
-		FAKE_COMMIT_MESSAGE="Modified A" git rebase -i --root &&
-	rm file1 &&
-	FAKE_COMMIT_MESSAGE="Reworded A" git rebase --continue &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="reword 1 2" \
+			FAKE_COMMIT_MESSAGE="Modified A" git rebase -i --root &&
+		rm file1 &&
+		FAKE_COMMIT_MESSAGE="Reworded A" git rebase --continue
+	) &&
 	test "$(git log -1 --format=%B HEAD^)" = "Reworded A" &&
 	test "$(git rev-list --count HEAD)" = 2
 '
@@ -1065,19 +1135,23 @@ test_expect_success C_LOCALE_OUTPUT 'rebase --edit-todo does not work on non-int
 	git checkout reword-original-root-branch &&
 	git reset --hard &&
 	git checkout conflict-branch &&
-	set_fake_editor &&
-	test_must_fail git rebase -f --onto HEAD~2 HEAD~ &&
-	test_must_fail git rebase --edit-todo &&
+	(
+		set_fake_editor &&
+		test_must_fail git rebase -f --onto HEAD~2 HEAD~ &&
+		test_must_fail git rebase --edit-todo
+	) &&
 	git rebase --abort
 '
 
 test_expect_success 'rebase --edit-todo can be used to modify todo' '
 	git reset --hard &&
 	git checkout no-conflict-branch^0 &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1 2 3" git rebase -i HEAD~3 &&
-	FAKE_LINES="2 1" git rebase --edit-todo &&
-	git rebase --continue &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1 2 3" git rebase -i HEAD~3 &&
+		FAKE_LINES="2 1" git rebase --edit-todo &&
+		git rebase --continue
+	) &&
 	test M = $(git cat-file commit HEAD^ | sed -ne \$p) &&
 	test L = $(git cat-file commit HEAD | sed -ne \$p)
 '
@@ -1085,7 +1159,6 @@ test_expect_success 'rebase --edit-todo can be used to modify todo' '
 test_expect_success 'rebase -i produces readable reflog' '
 	git reset --hard &&
 	git branch -f branch-reflog-test H &&
-	set_fake_editor &&
 	git rebase -i --onto I F branch-reflog-test &&
 	cat >expect <<-\EOF &&
 	rebase -i (finish): returning to refs/heads/branch-reflog-test
@@ -1106,8 +1179,10 @@ test_expect_success 'rebase -i respects core.commentchar' '
 	sed -e "2,\$s/^/\\\\/" "$1" >"$1.tmp" &&
 	mv "$1.tmp" "$1"
 	EOF
-	test_set_editor "$(pwd)/remove-all-but-first.sh" &&
-	git rebase -i B &&
+	(
+		test_set_editor "$(pwd)/remove-all-but-first.sh" &&
+		git rebase -i B
+	) &&
 	test B = $(git cat-file commit HEAD^ | sed -ne \$p)
 '
 
@@ -1116,9 +1191,11 @@ test_expect_success 'rebase -i respects core.commentchar=auto' '
 	write_script copy-edit-script.sh <<-\EOF &&
 	cp "$1" edit-script
 	EOF
-	test_set_editor "$(pwd)/copy-edit-script.sh" &&
 	test_when_finished "git rebase --abort || :" &&
-	git rebase -i HEAD^ &&
+	(
+		test_set_editor "$(pwd)/copy-edit-script.sh" &&
+		git rebase -i HEAD^
+	) &&
 	test -z "$(grep -ve "^#" -e "^\$" -e "^pick" edit-script)"
 '
 
@@ -1153,8 +1230,11 @@ test_expect_success 'interrupted rebase -i with --strategy and -X' '
 	echo five >conflict &&
 	echo Z >file1 &&
 	git commit -a -m "one file conflict" &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1 2" git rebase -i --strategy=recursive -Xours conflict-branch &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1 2" git rebase -i --strategy=recursive \
+			-Xours conflict-branch
+	) &&
 	git rebase --continue &&
 	test $(git show conflict-branch:conflict) = $(cat conflict) &&
 	test $(cat file1) = Z
@@ -1195,8 +1275,10 @@ test_expect_success SHA1 'short SHA-1 collide' '
 
 test_expect_success 'respect core.abbrev' '
 	git config core.abbrev 12 &&
-	set_cat_todo_editor &&
-	test_must_fail git rebase -i HEAD~4 >todo-list &&
+	(
+		set_cat_todo_editor &&
+		test_must_fail git rebase -i HEAD~4 >todo-list
+	) &&
 	test 4 = $(grep -c "pick [0-9a-f]\{12,\}" todo-list)
 '
 
@@ -1204,16 +1286,20 @@ test_expect_success 'todo count' '
 	write_script dump-raw.sh <<-\EOF &&
 		cat "$1"
 	EOF
-	test_set_editor "$(pwd)/dump-raw.sh" &&
-	git rebase -i HEAD~4 >actual &&
+	(
+		test_set_editor "$(pwd)/dump-raw.sh" &&
+		git rebase -i HEAD~4 >actual
+	) &&
 	test_i18ngrep "^# Rebase ..* onto ..* ([0-9]" actual
 '
 
 test_expect_success 'rebase -i commits that overwrite untracked files (pick)' '
 	git checkout --force branch2 &&
 	git clean -f &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1 2" git rebase -i A &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1 2" git rebase -i A
+	) &&
 	test_cmp_rev HEAD F &&
 	test_path_is_missing file6 &&
 	>file6 &&
@@ -1228,8 +1314,10 @@ test_expect_success 'rebase -i commits that overwrite untracked files (squash)'
 	git checkout --force branch2 &&
 	git clean -f &&
 	git tag original-branch2 &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1 squash 2" git rebase -i A &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1 squash 2" git rebase -i A
+	) &&
 	test_cmp_rev HEAD F &&
 	test_path_is_missing file6 &&
 	>file6 &&
@@ -1244,8 +1332,10 @@ test_expect_success 'rebase -i commits that overwrite untracked files (squash)'
 test_expect_success 'rebase -i commits that overwrite untracked files (no ff)' '
 	git checkout --force branch2 &&
 	git clean -f &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1 2" git rebase -i --no-ff A &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1 2" git rebase -i --no-ff A
+	) &&
 	test $(git cat-file commit HEAD | sed -ne \$p) = F &&
 	test_path_is_missing file6 &&
 	>file6 &&
@@ -1268,8 +1358,10 @@ test_expect_success 'rebase --continue removes CHERRY_PICK_HEAD' '
 	git tag seq-onto &&
 	git reset --hard HEAD~2 &&
 	git cherry-pick seq-onto &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES= git rebase -i seq-onto &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES= git rebase -i seq-onto
+	) &&
 	test -d .git/rebase-merge &&
 	git rebase --continue &&
 	git diff --exit-code seq-onto &&
@@ -1288,8 +1380,10 @@ rebase_setup_and_clean () {
 
 test_expect_success 'drop' '
 	rebase_setup_and_clean drop-test &&
-	set_fake_editor &&
-	FAKE_LINES="1 drop 2 3 d 4 5" git rebase -i --root &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 drop 2 3 d 4 5" git rebase -i --root
+	) &&
 	test E = $(git cat-file commit HEAD | sed -ne \$p) &&
 	test C = $(git cat-file commit HEAD^ | sed -ne \$p) &&
 	test A = $(git cat-file commit HEAD^^ | sed -ne \$p)
@@ -1298,9 +1392,10 @@ test_expect_success 'drop' '
 test_expect_success 'rebase -i respects rebase.missingCommitsCheck = ignore' '
 	test_config rebase.missingCommitsCheck ignore &&
 	rebase_setup_and_clean missing-commit &&
-	set_fake_editor &&
-	FAKE_LINES="1 2 3 4" \
-		git rebase -i --root 2>actual &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 2 3 4" git rebase -i --root 2>actual
+	) &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
 	test_i18ngrep \
 		"Successfully rebased and updated refs/heads/missing-commit" \
@@ -1316,9 +1411,10 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = warn' '
 	EOF
 	test_config rebase.missingCommitsCheck warn &&
 	rebase_setup_and_clean missing-commit &&
-	set_fake_editor &&
-	FAKE_LINES="1 2 3 4" \
-		git rebase -i --root 2>actual.2 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="1 2 3 4" git rebase -i --root 2>actual.2
+	) &&
 	head -n4 actual.2 >actual &&
 	test_i18ncmp expect actual &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p)
@@ -1340,14 +1436,15 @@ test_expect_success 'rebase -i respects rebase.missingCommitsCheck = error' '
 	EOF
 	test_config rebase.missingCommitsCheck error &&
 	rebase_setup_and_clean missing-commit &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 2 4" \
-		git rebase -i --root 2>actual &&
-	test_i18ncmp expect actual &&
-	cp .git/rebase-merge/git-rebase-todo.backup \
-		.git/rebase-merge/git-rebase-todo &&
-	FAKE_LINES="1 2 drop 3 4 drop 5" \
-		git rebase --edit-todo &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 2 4" \
+			git rebase -i --root 2>actual &&
+		test_i18ncmp expect actual &&
+		cp .git/rebase-merge/git-rebase-todo.backup \
+			.git/rebase-merge/git-rebase-todo &&
+		FAKE_LINES="1 2 drop 3 4 drop 5" git rebase --edit-todo
+	) &&
 	git rebase --continue &&
 	test D = $(git cat-file commit HEAD | sed -ne \$p) &&
 	test B = $(git cat-file commit HEAD^ | sed -ne \$p)
@@ -1368,21 +1465,27 @@ test_expect_success 'respects rebase.abbreviateCommands with fixup, squash and e
 	x git show HEAD
 	EOF
 	git checkout abbrevcmd &&
-	set_cat_todo_editor &&
 	test_config rebase.abbreviateCommands true &&
-	test_must_fail git rebase -i --exec "git show HEAD" \
-		--autosquash master >actual &&
+	(
+		set_cat_todo_editor &&
+		test_must_fail git rebase -i --exec "git show HEAD" \
+			--autosquash master >actual
+	) &&
 	test_cmp expected actual
 '
 
 test_expect_success 'static check of bad command' '
 	rebase_setup_and_clean bad-cmd &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 2 3 bad 4 5" \
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 2 3 bad 4 5" \
 		git rebase -i --root 2>actual &&
-	test_i18ngrep "badcmd $(git rev-list --oneline -1 master~1)" actual &&
-	test_i18ngrep "You can fix this with .git rebase --edit-todo.." actual &&
-	FAKE_LINES="1 2 3 drop 4 5" git rebase --edit-todo &&
+		test_i18ngrep "badcmd $(git rev-list --oneline -1 master~1)" \
+				actual &&
+		test_i18ngrep "You can fix this with .git rebase --edit-todo.." \
+				actual &&
+		FAKE_LINES="1 2 3 drop 4 5" git rebase --edit-todo
+	) &&
 	git rebase --continue &&
 	test E = $(git cat-file commit HEAD | sed -ne \$p) &&
 	test C = $(git cat-file commit HEAD^ | sed -ne \$p)
@@ -1398,19 +1501,24 @@ test_expect_success 'tabs and spaces are accepted in the todolist' '
 	) >"$1.new"
 	mv "$1.new" "$1"
 	EOF
-	test_set_editor "$(pwd)/add-indent.sh" &&
-	git rebase -i HEAD^^^ &&
+	(
+		test_set_editor "$(pwd)/add-indent.sh" &&
+		git rebase -i HEAD^^^
+	) &&
 	test E = $(git cat-file commit HEAD | sed -ne \$p)
 '
 
 test_expect_success 'static check of bad SHA-1' '
 	rebase_setup_and_clean bad-sha &&
-	set_fake_editor &&
-	test_must_fail env FAKE_LINES="1 2 edit fakesha 3 4 5 #" \
-		git rebase -i --root 2>actual &&
-	test_i18ngrep "edit XXXXXXX False commit" actual &&
-	test_i18ngrep "You can fix this with .git rebase --edit-todo.." actual &&
-	FAKE_LINES="1 2 4 5 6" git rebase --edit-todo &&
+	(
+		set_fake_editor &&
+		test_must_fail env FAKE_LINES="1 2 edit fakesha 3 4 5 #" \
+			git rebase -i --root 2>actual &&
+			test_i18ngrep "edit XXXXXXX False commit" actual &&
+			test_i18ngrep "You can fix this with .git rebase --edit-todo.." \
+					actual &&
+		FAKE_LINES="1 2 4 5 6" git rebase --edit-todo
+	) &&
 	git rebase --continue &&
 	test E = $(git cat-file commit HEAD | sed -ne \$p)
 '
@@ -1429,39 +1537,71 @@ test_expect_success 'editor saves as CR/LF' '
 
 test_expect_success 'rebase -i --gpg-sign=<key-id>' '
 	test_when_finished "test_might_fail git rebase --abort" &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1" git rebase -i --gpg-sign="\"S I Gner\"" HEAD^ \
-		>out 2>err &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1" git rebase -i --gpg-sign="\"S I Gner\"" \
+			HEAD^ >out 2>err
+	) &&
 	test_i18ngrep "$SQ-S\"S I Gner\"$SQ" err
 '
 
 test_expect_success 'rebase -i --gpg-sign=<key-id> overrides commit.gpgSign' '
 	test_when_finished "test_might_fail git rebase --abort" &&
 	test_config commit.gpgsign true &&
-	set_fake_editor &&
-	FAKE_LINES="edit 1" git rebase -i --gpg-sign="\"S I Gner\"" HEAD^ \
-		>out 2>err &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 1" git rebase -i --gpg-sign="\"S I Gner\"" \
+			HEAD^ >out 2>err
+	) &&
 	test_i18ngrep "$SQ-S\"S I Gner\"$SQ" err
 '
 
 test_expect_success 'valid author header after --root swap' '
 	rebase_setup_and_clean author-header no-conflict-branch &&
-	set_fake_editor &&
 	git commit --amend --author="Au ${SQ}thor <author@example.com>" --no-edit &&
 	git cat-file commit HEAD | grep ^author >expected &&
-	FAKE_LINES="5 1" git rebase -i --root &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="5 1" git rebase -i --root
+	) &&
 	git cat-file commit HEAD^ | grep ^author >actual &&
 	test_cmp expected actual
 '
 
 test_expect_success 'valid author header when author contains single quote' '
 	rebase_setup_and_clean author-header no-conflict-branch &&
-	set_fake_editor &&
 	git commit --amend --author="Au ${SQ}thor <author@example.com>" --no-edit &&
 	git cat-file commit HEAD | grep ^author >expected &&
-	FAKE_LINES="2" git rebase -i HEAD~2 &&
+	(
+		set_fake_editor &&
+		FAKE_LINES="2" git rebase -i HEAD~2
+	) &&
 	git cat-file commit HEAD | grep ^author >actual &&
 	test_cmp expected actual
 '
 
+test_expect_success 'post-commit hook is called' '
+	test_when_finished "rm -f .git/hooks/post-commit" &&
+	>actual &&
+	mkdir -p .git/hooks &&
+	write_script .git/hooks/post-commit <<-\EOS &&
+	git rev-parse HEAD >>actual
+	EOS
+	(
+		set_fake_editor &&
+		FAKE_LINES="edit 4 1 reword 2 fixup 3" git rebase -i A E &&
+		echo x>file3 &&
+		git add file3 &&
+		FAKE_COMMIT_MESSAGE=edited git rebase --continue
+	) &&
+	git rev-parse HEAD@{5} HEAD@{4} HEAD@{3} HEAD@{2} HEAD@{1} HEAD \
+		>expect &&
+	test_cmp expect actual
+'
+
+# This must be the last test in this file
+test_expect_success '$EDITOR and friends are unchanged' '
+	test_editor_unchanged
+'
+
 test_done