t: mark several tests that assume the files backend with REFFILES

Add the REFFILES prerequisite to several tests that assume we're using
the files backend. There are various reasons why we cannot easily
convert those tests to be backend-independent, where the most common
one is that we have no way to write corrupt references into the refdb
via our tooling. We may at a later point in time grow the tooling to
make this possible, but for now we just mark these tests as requiring
the files backend.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1400-update-ref.sh

@@ -236,7 +236,7 @@ test_expect_success 'update-ref --no-deref -d can delete self-reference' '
 	test_must_fail git show-ref --verify -q refs/heads/self
 '
 
-test_expect_success 'update-ref --no-deref -d can delete reference to bad ref' '
+test_expect_success REFFILES 'update-ref --no-deref -d can delete reference to bad ref' '
 	>.git/refs/heads/bad &&
 	test_when_finished "rm -f .git/refs/heads/bad" &&
 	git symbolic-ref refs/heads/ref-to-bad refs/heads/bad &&
@@ -288,7 +288,7 @@ test_expect_success "set $m (logged by touch)" '
 	test $A = $(git show-ref -s --verify $m)
 '
 
-test_expect_success 'empty directory removal' '
+test_expect_success REFFILES 'empty directory removal' '
 	git branch d1/d2/r1 HEAD &&
 	git branch d1/r2 HEAD &&
 	test_path_is_file .git/refs/heads/d1/d2/r1 &&
@@ -300,7 +300,7 @@ test_expect_success 'empty directory removal' '
 	test_path_is_file .git/logs/refs/heads/d1/r2
 '
 
-test_expect_success 'symref empty directory removal' '
+test_expect_success REFFILES 'symref empty directory removal' '
 	git branch e1/e2/r1 HEAD &&
 	git branch e1/r2 HEAD &&
 	git checkout e1/e2/r1 &&
@@ -1639,7 +1639,7 @@ test_expect_success PIPE 'transaction flushes status updates' '
 	test_cmp expected actual
 '
 
-test_expect_success 'directory not created deleting packed ref' '
+test_expect_success REFFILES 'directory not created deleting packed ref' '
 	git branch d1/d2/r1 HEAD &&
 	git pack-refs --all &&
 	test_path_is_missing .git/refs/heads/d1/d2 &&

t/t1450-fsck.sh

@@ -123,7 +123,7 @@ test_expect_success 'branch pointing to non-commit' '
 	test_i18ngrep "not a commit" out
 '
 
-test_expect_success 'HEAD link pointing at a funny object' '
+test_expect_success REFFILES 'HEAD link pointing at a funny object' '
 	test_when_finished "git update-ref HEAD $orig_head" &&
 	echo $ZERO_OID >.git/HEAD &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
@@ -139,7 +139,7 @@ test_expect_success 'HEAD link pointing at a funny place' '
 	test_i18ngrep "HEAD points to something strange" out
 '
 
-test_expect_success 'HEAD link pointing at a funny object (from different wt)' '
+test_expect_success REFFILES 'HEAD link pointing at a funny object (from different wt)' '
 	test_when_finished "git update-ref HEAD $orig_head" &&
 	test_when_finished "git worktree remove -f wt" &&
 	git worktree add wt &&
@@ -149,7 +149,7 @@ test_expect_success 'HEAD link pointing at a funny object (from different wt)' '
 	test_i18ngrep "main-worktree/HEAD: detached HEAD points" out
 '
 
-test_expect_success 'other worktree HEAD link pointing at a funny object' '
+test_expect_success REFFILES 'other worktree HEAD link pointing at a funny object' '
 	test_when_finished "git worktree remove -f other" &&
 	git worktree add other &&
 	echo $ZERO_OID >.git/worktrees/other/HEAD &&

t/t2011-checkout-invalid-head.sh

@@ -18,18 +18,18 @@ test_expect_success 'checkout should not start branch from a tree' '
 	test_must_fail git checkout -b newbranch main^{tree}
 '
 
-test_expect_success 'checkout main from invalid HEAD' '
+test_expect_success REFFILES 'checkout main from invalid HEAD' '
 	echo $ZERO_OID >.git/HEAD &&
 	git checkout main --
 '
 
-test_expect_success 'checkout notices failure to lock HEAD' '
+test_expect_success REFFILES 'checkout notices failure to lock HEAD' '
 	test_when_finished "rm -f .git/HEAD.lock" &&
 	>.git/HEAD.lock &&
 	test_must_fail git checkout -b other
 '
 
-test_expect_success 'create ref directory/file conflict scenario' '
+test_expect_success REFFILES 'create ref directory/file conflict scenario' '
 	git update-ref refs/heads/outer/inner main &&
 
 	# do not rely on symbolic-ref to get a known state,
@@ -39,26 +39,26 @@ test_expect_success 'create ref directory/file conflict scenario' '
 	}
 '
 
-test_expect_success 'checkout away from d/f HEAD (unpacked, to branch)' '
+test_expect_success REFFILES 'checkout away from d/f HEAD (unpacked, to branch)' '
 	reset_to_df &&
 	git checkout main
 '
 
-test_expect_success 'checkout away from d/f HEAD (unpacked, to detached)' '
+test_expect_success REFFILES 'checkout away from d/f HEAD (unpacked, to detached)' '
 	reset_to_df &&
 	git checkout --detach main
 '
 
-test_expect_success 'pack refs' '
+test_expect_success REFFILES 'pack refs' '
 	git pack-refs --all --prune
 '
 
-test_expect_success 'checkout away from d/f HEAD (packed, to branch)' '
+test_expect_success REFFILES 'checkout away from d/f HEAD (packed, to branch)' '
 	reset_to_df &&
 	git checkout main
 '
 
-test_expect_success 'checkout away from d/f HEAD (packed, to detached)' '
+test_expect_success REFFILES 'checkout away from d/f HEAD (packed, to detached)' '
 	reset_to_df &&
 	git checkout --detach main
 '

t/t3200-branch.sh

@@ -28,7 +28,7 @@ test_expect_success 'git branch --help should not have created a bogus branch' '
 	test_ref_missing refs/heads/--help
 '
 
-test_expect_success 'branch -h in broken repository' '
+test_expect_success REFFILES 'branch -h in broken repository' '
 	mkdir broken &&
 	(
 		cd broken &&
@@ -245,7 +245,7 @@ test_expect_success 'git branch -M baz bam should succeed when baz is checked ou
 	git worktree prune
 '
 
-test_expect_success 'git branch -M fails if updating any linked working tree fails' '
+test_expect_success REFFILES 'git branch -M fails if updating any linked working tree fails' '
 	git worktree add -b baz bazdir1 &&
 	git worktree add -f bazdir2 baz &&
 	touch .git/worktrees/bazdir1/HEAD.lock &&
@@ -836,14 +836,14 @@ test_expect_success 'renaming a symref is not allowed' '
 	test_ref_missing refs/heads/new-topic
 '
 
-test_expect_success SYMLINKS 'git branch -m u v should fail when the reflog for u is a symlink' '
+test_expect_success SYMLINKS,REFFILES 'git branch -m u v should fail when the reflog for u is a symlink' '
 	git branch --create-reflog u &&
 	mv .git/logs/refs/heads/u real-u &&
 	ln -s real-u .git/logs/refs/heads/u &&
 	test_must_fail git branch -m u v
 '
 
-test_expect_success SYMLINKS 'git branch -m with symlinked .git/refs' '
+test_expect_success SYMLINKS,REFFILES 'git branch -m with symlinked .git/refs' '
 	test_when_finished "rm -rf subdir" &&
 	git init --bare subdir &&
 

t/t3400-rebase.sh

@@ -424,7 +424,7 @@ test_expect_success 'refuse to switch to branch checked out elsewhere' '
 	test_i18ngrep "already used by worktree at" err
 '
 
-test_expect_success MINGW,SYMLINKS_WINDOWS 'rebase when .git/logs is a symlink' '
+test_expect_success REFFILES,MINGW,SYMLINKS_WINDOWS 'rebase when .git/logs is a symlink' '
 	git checkout main &&
 	mv .git/logs actual_logs &&
 	cmd //c "mklink /D .git\logs ..\actual_logs" &&

t/t5605-clone-local.sh

@@ -157,7 +157,7 @@ test_expect_success 'cloning locally respects "-u" for fetching refs' '
 	test_must_fail git clone --bare -u false a should_not_work.git
 '
 
-test_expect_success 'local clone from repo with corrupt refs fails gracefully' '
+test_expect_success REFFILES 'local clone from repo with corrupt refs fails gracefully' '
 	git init corrupt &&
 	test_commit -C corrupt one &&
 	echo a >corrupt/.git/refs/heads/topic &&