4 files changed, 99 insertions, 0 deletions

diff --git a/t/helper/test-read-graph.c b/t/helper/test-read-graph.c
new file mode 100644
index 0000000000..d2884efe0a
--- /dev/null
+++ b/t/helper/test-read-graph.c
@@ -0,0 +1,53 @@
+#include "test-tool.h"
+#include "cache.h"
+#include "commit-graph.h"
+#include "repository.h"
+#include "object-store.h"
+
+int cmd__read_graph(int argc, const char **argv)
+{
+	struct commit_graph *graph = NULL;
+	char *graph_name;
+	int open_ok;
+	int fd;
+	struct stat st;
+	const char *object_dir;
+
+	setup_git_directory();
+	object_dir = get_object_directory();
+
+	graph_name = get_commit_graph_filename(object_dir);
+
+	open_ok = open_commit_graph(graph_name, &fd, &st);
+	if (!open_ok)
+		die_errno(_("Could not open commit-graph '%s'"), graph_name);
+
+	graph = load_commit_graph_one_fd_st(fd, &st);
+	if (!graph)
+		return 1;
+
+	FREE_AND_NULL(graph_name);
+
+	printf("header: %08x %d %d %d %d\n",
+		ntohl(*(uint32_t*)graph->data),
+		*(unsigned char*)(graph->data + 4),
+		*(unsigned char*)(graph->data + 5),
+		*(unsigned char*)(graph->data + 6),
+		*(unsigned char*)(graph->data + 7));
+	printf("num_commits: %u\n", graph->num_commits);
+	printf("chunks:");
+
+	if (graph->chunk_oid_fanout)
+		printf(" oid_fanout");
+	if (graph->chunk_oid_lookup)
+		printf(" oid_lookup");
+	if (graph->chunk_commit_data)
+		printf(" commit_metadata");
+	if (graph->chunk_extra_edges)
+		printf(" extra_edges");
+	printf("\n");
+
+	UNLEAK(graph);
+
+	return 0;
+}
diff --git a/t/helper/test-run-command.c b/t/helper/test-run-command.c
index 724328975a..1646aa25d8 100644
--- a/t/helper/test-run-command.c
+++ b/t/helper/test-run-command.c
@@ -328,6 +328,46 @@ static int quote_echo(int argc, const char **argv)
 	return 0;
 }
 
+static int inherit_handle(const char *argv0)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	char path[PATH_MAX];
+	int tmp;
+
+	/* First, open an inheritable handle */
+	xsnprintf(path, sizeof(path), "out-XXXXXX");
+	tmp = xmkstemp(path);
+
+	argv_array_pushl(&cp.args,
+			 "test-tool", argv0, "inherited-handle-child", NULL);
+	cp.in = -1;
+	cp.no_stdout = cp.no_stderr = 1;
+	if (start_command(&cp) < 0)
+		die("Could not start child process");
+
+	/* Then close it, and try to delete it. */
+	close(tmp);
+	if (unlink(path))
+		die("Could not delete '%s'", path);
+
+	if (close(cp.in) < 0 || finish_command(&cp) < 0)
+		die("Child did not finish");
+
+	return 0;
+}
+
+static int inherit_handle_child(void)
+{
+	struct strbuf buf = STRBUF_INIT;
+
+	if (strbuf_read(&buf, 0, 0) < 0)
+		die("Could not read stdin");
+	printf("Received %s\n", buf.buf);
+	strbuf_release(&buf);
+
+	return 0;
+}
+
 int cmd__run_command(int argc, const char **argv)
 {
 	struct child_process proc = CHILD_PROCESS_INIT;
@@ -335,6 +375,10 @@ int cmd__run_command(int argc, const char **argv)
 
 	if (argc > 1 && !strcmp(argv[1], "testsuite"))
 		exit(testsuite(argc - 1, argv + 1));
+	if (!strcmp(argv[1], "inherited-handle"))
+		exit(inherit_handle(argv[0]));
+	if (!strcmp(argv[1], "inherited-handle-child"))
+		exit(inherit_handle_child());
 
 	if (argc >= 2 && !strcmp(argv[1], "quote-stress-test"))
 		return !!quote_stress_test(argc - 1, argv + 1);
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 19ee26d931..f20989d449 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -45,6 +45,7 @@ static struct test_cmd cmds[] = {
 	{ "progress", cmd__progress },
 	{ "reach", cmd__reach },
 	{ "read-cache", cmd__read_cache },
+	{ "read-graph", cmd__read_graph },
 	{ "read-midx", cmd__read_midx },
 	{ "ref-store", cmd__ref_store },
 	{ "regex", cmd__regex },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index c2aa56ef50..8ed2af71d1 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -35,6 +35,7 @@ int cmd__prio_queue(int argc, const char **argv);
 int cmd__progress(int argc, const char **argv);
 int cmd__reach(int argc, const char **argv);
 int cmd__read_cache(int argc, const char **argv);
+int cmd__read_graph(int argc, const char **argv);
 int cmd__read_midx(int argc, const char **argv);
 int cmd__ref_store(int argc, const char **argv);
 int cmd__regex(int argc, const char **argv);