t: convert tests to not write references via the filesystem

Some of our tests manually create, update or delete references by
writing the respective new values into the filesystem directly. While
this works with the current files reference backend, this will break
once we have a second reference backend implementation in our codebase.

Refactor these tests to instead use git-update-ref(1) or our `ref-store`
test tool. The latter is required in some cases where safety checks of
git-update-ref(1) would otherwise reject a reference update.

While at it, refactor some of the tests to schedule the cleanup command
via `test_when_finished` before modifying the repository.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

t/t1400-update-ref.sh

@@ -9,8 +9,6 @@ test_description='Test git update-ref and basic ref logging'
 Z=$ZERO_OID
 
 m=refs/heads/main
-n_dir=refs/heads/gu
-n=$n_dir/fixes
 outside=refs/foo
 bare=bare-repo
 
@@ -62,10 +60,10 @@ test_expect_success "delete $m without oldvalue verification" '
 	test_must_fail git show-ref --verify -q $m
 '
 
-test_expect_success "fail to create $n" '
-	test_when_finished "rm -f .git/$n_dir" &&
-	touch .git/$n_dir &&
-	test_must_fail git update-ref $n $A
+test_expect_success "fail to create $n due to file/directory conflict" '
+	test_when_finished "git update-ref -d refs/heads/gu" &&
+	git update-ref refs/heads/gu $A &&
+	test_must_fail git update-ref refs/heads/gu/fixes $A
 '
 
 test_expect_success "create $m (by HEAD)" '
@@ -221,16 +219,16 @@ test_expect_success 'delete symref without dereference when the referred ref is
 '
 
 test_expect_success 'update-ref -d is not confused by self-reference' '
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF refs/heads/self" &&
 	git symbolic-ref refs/heads/self refs/heads/self &&
-	test_when_finished "rm -f .git/refs/heads/self" &&
 	test_path_is_file .git/refs/heads/self &&
 	test_must_fail git update-ref -d refs/heads/self &&
 	test_path_is_file .git/refs/heads/self
 '
 
 test_expect_success 'update-ref --no-deref -d can delete self-reference' '
+	test_when_finished "test-tool ref-store main delete-refs REF_NO_DEREF refs/heads/self" &&
 	git symbolic-ref refs/heads/self refs/heads/self &&
-	test_when_finished "rm -f .git/refs/heads/self" &&
 	test_path_is_file .git/refs/heads/self &&
 	git update-ref --no-deref -d refs/heads/self &&
 	test_must_fail git show-ref --verify -q refs/heads/self
@@ -434,7 +432,8 @@ test_expect_success 'Query "main@{2005-05-28}" (past end of history)' '
 	test_i18ngrep -F "warning: log for ref $m unexpectedly ended on $ld" e
 '
 
-rm -f .git/$m .git/logs/$m expect
+rm -f expect
+git update-ref -d $m
 
 test_expect_success 'creating initial files' '
 	test_when_finished rm -f M &&

t/t1450-fsck.sh

@@ -15,6 +15,7 @@ test_expect_success setup '
 	git config --unset i18n.commitencoding &&
 	git checkout HEAD^0 &&
 	test_commit B fileB two &&
+	orig_head=$(git rev-parse HEAD) &&
 	git tag -d A B &&
 	git reflog expire --expire=now --all
 '
@@ -115,35 +116,33 @@ test_expect_success 'zlib corrupt loose object output ' '
 '
 
 test_expect_success 'branch pointing to non-commit' '
-	git rev-parse HEAD^{tree} >.git/refs/heads/invalid &&
+	tree_oid=$(git rev-parse --verify HEAD^{tree}) &&
 	test_when_finished "git update-ref -d refs/heads/invalid" &&
+	test-tool ref-store main update-ref msg refs/heads/invalid $tree_oid $ZERO_OID REF_SKIP_OID_VERIFICATION &&
 	test_must_fail git fsck 2>out &&
 	test_i18ngrep "not a commit" out
 '
 
 test_expect_success 'HEAD link pointing at a funny object' '
-	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
-	mv .git/HEAD .git/SAVED_HEAD &&
+	test_when_finished "git update-ref HEAD $orig_head" &&
 	echo $ZERO_OID >.git/HEAD &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail env GIT_DIR=.git git fsck 2>out &&
 	test_i18ngrep "detached HEAD points" out
 '
 
 test_expect_success 'HEAD link pointing at a funny place' '
-	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
-	mv .git/HEAD .git/SAVED_HEAD &&
+	test_when_finished "git update-ref --no-deref HEAD $orig_head" &&
 	echo "ref: refs/funny/place" >.git/HEAD &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail env GIT_DIR=.git git fsck 2>out &&
 	test_i18ngrep "HEAD points to something strange" out
 '
 
 test_expect_success 'HEAD link pointing at a funny object (from different wt)' '
-	test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
+	test_when_finished "git update-ref HEAD $orig_head" &&
 	test_when_finished "rm -rf .git/worktrees wt" &&
 	git worktree add wt &&
-	mv .git/HEAD .git/SAVED_HEAD &&
 	echo $ZERO_OID >.git/HEAD &&
 	# avoid corrupt/broken HEAD from interfering with repo discovery
 	test_must_fail git -C wt fsck 2>out &&
@@ -161,7 +160,8 @@ test_expect_success 'other worktree HEAD link pointing at a funny object' '
 test_expect_success 'other worktree HEAD link pointing at missing object' '
 	test_when_finished "rm -rf .git/worktrees other" &&
 	git worktree add other &&
-	echo "Contents missing from repo" | git hash-object --stdin >.git/worktrees/other/HEAD &&
+	object_id=$(echo "Contents missing from repo" | git hash-object --stdin) &&
+	test-tool -C other ref-store main update-ref msg HEAD $object_id "" REF_NO_DEREF,REF_SKIP_OID_VERIFICATION &&
 	test_must_fail git fsck 2>out &&
 	test_i18ngrep "worktrees/other/HEAD: invalid sha1 pointer" out
 '
@@ -391,7 +391,7 @@ test_expect_success 'tag pointing to nonexistent' '
 
 	tag=$(git hash-object -t tag -w --stdin <invalid-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/invalid &&
+	git update-ref refs/tags/invalid $tag &&
 	test_when_finished "git update-ref -d refs/tags/invalid" &&
 	test_must_fail git fsck --tags >out &&
 	test_i18ngrep "broken link" out
@@ -411,7 +411,7 @@ test_expect_success 'tag pointing to something else than its type' '
 
 	tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags
 '
@@ -428,7 +428,7 @@ test_expect_success 'tag with incorrect tag name & missing tagger' '
 
 	tag=$(git hash-object --literally -t tag -w --stdin <wrong-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	git fsck --tags 2>out &&
 
@@ -452,7 +452,7 @@ test_expect_success 'tag with bad tagger' '
 
 	tag=$(git hash-object --literally -t tag -w --stdin <wrong-tag) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags 2>out &&
 	test_i18ngrep "error in tag .*: invalid author/committer" out
@@ -471,7 +471,7 @@ test_expect_success 'tag with NUL in header' '
 
 	tag=$(git hash-object --literally -t tag -w --stdin <tag-NUL-header) &&
 	test_when_finished "remove_object $tag" &&
-	echo $tag >.git/refs/tags/wrong &&
+	git update-ref refs/tags/wrong $tag &&
 	test_when_finished "git update-ref -d refs/tags/wrong" &&
 	test_must_fail git fsck --tags 2>out &&
 	test_i18ngrep "error in tag $tag.*unterminated header: NUL at offset" out

t/t3404-rebase-interactive.sh

@@ -2160,7 +2160,7 @@ test_expect_success '--update-refs: check failed ref update' '
 	# recorded in the update-refs file. We will force-update the
 	# "second" ref, but "git branch -f" will not work because of
 	# the lock in the update-refs file.
-	git rev-parse third >.git/refs/heads/second &&
+	git update-ref refs/heads/second third &&
 
 	test_must_fail git rebase --continue 2>err &&
 	grep "update_ref failed for ref '\''refs/heads/second'\''" err &&

t/t5526-fetch-submodules.sh

@@ -771,7 +771,7 @@ test_expect_success 'fetching submodule into a broken repository' '
 	git -C dst fetch --recurse-submodules &&
 
 	# Break the receiving submodule
-	rm -f dst/sub/.git/HEAD &&
+	test-tool -C dst/sub ref-store main delete-refs REF_NO_DEREF msg HEAD &&
 
 	# NOTE: without the fix the following tests will recurse forever!
 	# They should terminate with an error.