upload-pack.c: treat want-ref relative to namespace

When 'upload-pack' runs within the context of a git namespace, treat any
'want-ref' lines the client sends as relative to that namespace.

Also check if the wanted ref is hidden via 'hideRefs'. If it is hidden,
respond with an error as if the ref didn't exist.

Helped-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Kim Altintop <kim@eagain.st>
Reviewed-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 135 insertions, 0 deletions

diff --git a/t/t5703-upload-pack-ref-in-want.sh b/t/t5703-upload-pack-ref-in-want.sh
index 3dad21ff45..220098523a 100755
--- a/t/t5703-upload-pack-ref-in-want.sh
+++ b/t/t5703-upload-pack-ref-in-want.sh
@@ -299,6 +299,141 @@ test_expect_success 'fetching with wildcard that matches multiple refs' '
 	grep "want-ref refs/heads/o/bar" log
 '
 
+REPO="$(pwd)/repo-ns"
+
+test_expect_success 'setup namespaced repo' '
+	(
+		git init -b main "$REPO" &&
+		cd "$REPO" &&
+		test_commit a &&
+		test_commit b &&
+		git checkout a &&
+		test_commit c &&
+		git checkout a &&
+		test_commit d &&
+		git update-ref refs/heads/ns-no b &&
+		git update-ref refs/namespaces/ns/refs/heads/ns-yes c &&
+		git update-ref refs/namespaces/ns/refs/heads/hidden d
+	) &&
+	git -C "$REPO" config uploadpack.allowRefInWant true
+'
+
+test_expect_success 'with namespace: want-ref is considered relative to namespace' '
+	wanted_ref=refs/heads/ns-yes &&
+
+	oid=$(git -C "$REPO" rev-parse "refs/namespaces/ns/$wanted_ref") &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	GIT_NAMESPACE=ns test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+test_expect_success 'with namespace: want-ref outside namespace is unknown' '
+	wanted_ref=refs/heads/ns-no &&
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test_must_fail env GIT_NAMESPACE=ns \
+		test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	grep "unknown ref" out
+'
+
+# Cross-check refs/heads/ns-no indeed exists
+test_expect_success 'without namespace: want-ref outside namespace succeeds' '
+	wanted_ref=refs/heads/ns-no &&
+
+	oid=$(git -C "$REPO" rev-parse $wanted_ref) &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+test_expect_success 'with namespace: hideRefs is matched, relative to namespace' '
+	wanted_ref=refs/heads/hidden &&
+	git -C "$REPO" config transfer.hideRefs $wanted_ref &&
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test_must_fail env GIT_NAMESPACE=ns \
+		test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	grep "unknown ref" out
+'
+
+# Cross-check refs/heads/hidden indeed exists
+test_expect_success 'with namespace: want-ref succeeds if hideRefs is removed' '
+	wanted_ref=refs/heads/hidden &&
+	git -C "$REPO" config --unset transfer.hideRefs $wanted_ref &&
+
+	oid=$(git -C "$REPO" rev-parse "refs/namespaces/ns/$wanted_ref") &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	GIT_NAMESPACE=ns test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+test_expect_success 'without namespace: relative hideRefs does not match' '
+	wanted_ref=refs/namespaces/ns/refs/heads/hidden &&
+	git -C "$REPO" config transfer.hideRefs refs/heads/hidden &&
+
+	oid=$(git -C "$REPO" rev-parse $wanted_ref) &&
+	cat >expected_refs <<-EOF &&
+	$oid $wanted_ref
+	EOF
+	cat >expected_commits <<-EOF &&
+	$oid
+	$(git -C "$REPO" rev-parse a)
+	EOF
+
+	write_fetch_command >pkt <<-EOF &&
+	want-ref $wanted_ref
+	EOF
+	test-tool pkt-line pack <pkt >in &&
+
+	test-tool -C "$REPO" serve-v2 --stateless-rpc >out <in &&
+	check_output
+'
+
+
 . "$TEST_DIRECTORY"/lib-httpd.sh
 start_httpd