[PATCH v2 2/2] commit-graph.c: no lazy fetch in lookup_commit_in_graph()

[Han Xin <hanxin.hx@bytedance.com>]

If a commit is in the commit graph, we would expect the commit to also
be present. So we should use has_object() instead of
repo_has_object_file(), which will help us avoid getting into an endless
loop of lazy fetch.

When we found the commit in the graph in lookup_commit_in_graph(), but
the commit is missing from the repository, we will try
promisor_remote_get_direct() and then enter another loop. While
sometimes it will finally succeed because it cannot fork subprocess,
it has exhausted the local process resources and can be harmful to the
remote service.

Signed-off-by: Han Xin <hanxin.hx@bytedance.com>
---
 commit-graph.c                             |  2 +-
 t/t5329-no-lazy-fetch-with-commit-graph.sh | 47 ++++++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100755 t/t5329-no-lazy-fetch-with-commit-graph.sh

diff --git a/commit-graph.c b/commit-graph.c
index 2b52818731..2dd9bcc7ea 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -907,7 +907,7 @@ struct commit *lookup_commit_in_graph(struct repository *repo, const struct obje
 		return NULL;
 	if (!search_commit_pos_in_graph(id, repo->objects->commit_graph, &pos))
 		return NULL;
-	if (!repo_has_object_file(repo, id))
+	if (!has_object(repo, id, 0))
 		return NULL;
 
 	commit = lookup_commit(repo, id);
diff --git a/t/t5329-no-lazy-fetch-with-commit-graph.sh b/t/t5329-no-lazy-fetch-with-commit-graph.sh
new file mode 100755
index 0000000000..4d25d2c950
--- /dev/null
+++ b/t/t5329-no-lazy-fetch-with-commit-graph.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+
+test_description='test for no lazy fetch with the commit-graph'
+
+. ./test-lib.sh
+
+test_expect_success 'setup: prepare a repository with a commit' '
+	git init with-commit &&
+	test_commit -C with-commit the-commit &&
+	oid=$(git -C with-commit rev-parse HEAD)
+'
+
+test_expect_success 'setup: prepare a repository with commit-graph contains the commit' '
+	git init with-commit-graph &&
+	echo "$(pwd)/with-commit/.git/objects" \
+		>with-commit-graph/.git/objects/info/alternates &&
+	# create a ref that points to the commit in alternates
+	git -C with-commit-graph update-ref refs/ref_to_the_commit "$oid" &&
+	# prepare some other objects to commit-graph
+	test_commit -C with-commit-graph somthing &&
+	git -c gc.writeCommitGraph=true -C with-commit-graph gc &&
+	test_path_is_file with-commit-graph/.git/objects/info/commit-graph
+'
+
+test_expect_success 'setup: change the alternates to what without the commit' '
+	git init --bare without-commit &&
+	echo "$(pwd)/without-commit/objects" \
+		>with-commit-graph/.git/objects/info/alternates &&
+	test_must_fail git -C with-commit-graph cat-file -e $oid
+'
+
+test_expect_success 'setup: prepare another commit to fetch' '
+	test_commit -C with-commit another-commit &&
+	anycommit=$(git -C with-commit rev-parse HEAD)
+'
+
+test_expect_success ULIMIT_PROCESSES 'fetch any commit from promisor with the usage of the commit graph' '
+	git -C with-commit-graph remote add origin "$(pwd)/with-commit" &&
+	git -C with-commit-graph config remote.origin.promisor true &&
+	git -C with-commit-graph config remote.origin.partialclonefilter blob:none &&
+	GIT_TRACE="$(pwd)/trace" run_with_limited_processses \
+		git -C with-commit-graph fetch origin $anycommit 2>err &&
+	test_i18ngrep ! "fatal: promisor-remote: unable to fork off fetch subprocess" err &&
+	test $(grep "fetch origin" trace | wc -l) -eq 1
+'
+
+test_done
-- 
2.36.1