1 files changed, 263 insertions, 0 deletions
diff --git a/third_party/git/builtin/commit-graph.c b/third_party/git/builtin/commit-graph.c
new file mode 100644
index 000000000000..38027b83d9d8
--- /dev/null
+++ b/third_party/git/builtin/commit-graph.c
@@ -0,0 +1,263 @@
+#include "builtin.h"
+#include "config.h"
+#include "dir.h"
+#include "lockfile.h"
+#include "parse-options.h"
+#include "repository.h"
+#include "commit-graph.h"
+#include "object-store.h"
+
+static char const * const builtin_commit_graph_usage[] = {
+	N_("git commit-graph [--object-dir <objdir>]"),
+	N_("git commit-graph read [--object-dir <objdir>]"),
+	N_("git commit-graph verify [--object-dir <objdir>] [--shallow]"),
+	N_("git commit-graph write [--object-dir <objdir>] [--append|--split] [--reachable|--stdin-packs|--stdin-commits] <split options>"),
+	NULL
+};
+
+static const char * const builtin_commit_graph_verify_usage[] = {
+	N_("git commit-graph verify [--object-dir <objdir>] [--shallow]"),
+	NULL
+};
+
+static const char * const builtin_commit_graph_read_usage[] = {
+	N_("git commit-graph read [--object-dir <objdir>]"),
+	NULL
+};
+
+static const char * const builtin_commit_graph_write_usage[] = {
+	N_("git commit-graph write [--object-dir <objdir>] [--append|--split] [--reachable|--stdin-packs|--stdin-commits] <split options>"),
+	NULL
+};
+
+static struct opts_commit_graph {
+	const char *obj_dir;
+	int reachable;
+	int stdin_packs;
+	int stdin_commits;
+	int append;
+	int split;
+	int shallow;
+} opts;
+
+static int graph_verify(int argc, const char **argv)
+{
+	struct commit_graph *graph = NULL;
+	char *graph_name;
+	int open_ok;
+	int fd;
+	struct stat st;
+	int flags = 0;
+
+	static struct option builtin_commit_graph_verify_options[] = {
+		OPT_STRING(0, "object-dir", &opts.obj_dir,
+			   N_("dir"),
+			   N_("The object directory to store the graph")),
+		OPT_BOOL(0, "shallow", &opts.shallow,
+			 N_("if the commit-graph is split, only verify the tip file")),
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, NULL,
+			     builtin_commit_graph_verify_options,
+			     builtin_commit_graph_verify_usage, 0);
+
+	if (!opts.obj_dir)
+		opts.obj_dir = get_object_directory();
+	if (opts.shallow)
+		flags |= COMMIT_GRAPH_VERIFY_SHALLOW;
+
+	graph_name = get_commit_graph_filename(opts.obj_dir);
+	open_ok = open_commit_graph(graph_name, &fd, &st);
+	if (!open_ok && errno != ENOENT)
+		die_errno(_("Could not open commit-graph '%s'"), graph_name);
+
+	FREE_AND_NULL(graph_name);
+
+	if (open_ok)
+		graph = load_commit_graph_one_fd_st(fd, &st);
+	 else
+		graph = read_commit_graph_one(the_repository, opts.obj_dir);
+
+	/* Return failure if open_ok predicted success */
+	if (!graph)
+		return !!open_ok;
+
+	UNLEAK(graph);
+	return verify_commit_graph(the_repository, graph, flags);
+}
+
+static int graph_read(int argc, const char **argv)
+{
+	struct commit_graph *graph = NULL;
+	char *graph_name;
+	int open_ok;
+	int fd;
+	struct stat st;
+
+	static struct option builtin_commit_graph_read_options[] = {
+		OPT_STRING(0, "object-dir", &opts.obj_dir,
+			N_("dir"),
+			N_("The object directory to store the graph")),
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, NULL,
+			     builtin_commit_graph_read_options,
+			     builtin_commit_graph_read_usage, 0);
+
+	if (!opts.obj_dir)
+		opts.obj_dir = get_object_directory();
+
+	graph_name = get_commit_graph_filename(opts.obj_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;
+}
+
+extern int read_replace_refs;
+static struct split_commit_graph_opts split_opts;
+
+static int graph_write(int argc, const char **argv)
+{
+	struct string_list *pack_indexes = NULL;
+	struct string_list *commit_hex = NULL;
+	struct string_list lines;
+	int result = 0;
+	unsigned int flags = COMMIT_GRAPH_PROGRESS;
+
+	static struct option builtin_commit_graph_write_options[] = {
+		OPT_STRING(0, "object-dir", &opts.obj_dir,
+			N_("dir"),
+			N_("The object directory to store the graph")),
+		OPT_BOOL(0, "reachable", &opts.reachable,
+			N_("start walk at all refs")),
+		OPT_BOOL(0, "stdin-packs", &opts.stdin_packs,
+			N_("scan pack-indexes listed by stdin for commits")),
+		OPT_BOOL(0, "stdin-commits", &opts.stdin_commits,
+			N_("start walk at commits listed by stdin")),
+		OPT_BOOL(0, "append", &opts.append,
+			N_("include all commits already in the commit-graph file")),
+		OPT_BOOL(0, "split", &opts.split,
+			N_("allow writing an incremental commit-graph file")),
+		OPT_INTEGER(0, "max-commits", &split_opts.max_commits,
+			N_("maximum number of commits in a non-base split commit-graph")),
+		OPT_INTEGER(0, "size-multiple", &split_opts.size_multiple,
+			N_("maximum ratio between two levels of a split commit-graph")),
+		OPT_EXPIRY_DATE(0, "expire-time", &split_opts.expire_time,
+			N_("maximum number of commits in a non-base split commit-graph")),
+		OPT_END(),
+	};
+
+	split_opts.size_multiple = 2;
+	split_opts.max_commits = 0;
+	split_opts.expire_time = 0;
+
+	argc = parse_options(argc, argv, NULL,
+			     builtin_commit_graph_write_options,
+			     builtin_commit_graph_write_usage, 0);
+
+	if (opts.reachable + opts.stdin_packs + opts.stdin_commits > 1)
+		die(_("use at most one of --reachable, --stdin-commits, or --stdin-packs"));
+	if (!opts.obj_dir)
+		opts.obj_dir = get_object_directory();
+	if (opts.append)
+		flags |= COMMIT_GRAPH_APPEND;
+	if (opts.split)
+		flags |= COMMIT_GRAPH_SPLIT;
+
+	read_replace_refs = 0;
+
+	if (opts.reachable) {
+		if (write_commit_graph_reachable(opts.obj_dir, flags, &split_opts))
+			return 1;
+		return 0;
+	}
+
+	string_list_init(&lines, 0);
+	if (opts.stdin_packs || opts.stdin_commits) {
+		struct strbuf buf = STRBUF_INIT;
+
+		while (strbuf_getline(&buf, stdin) != EOF)
+			string_list_append(&lines, strbuf_detach(&buf, NULL));
+
+		if (opts.stdin_packs)
+			pack_indexes = &lines;
+		if (opts.stdin_commits)
+			commit_hex = &lines;
+
+		UNLEAK(buf);
+	}
+
+	if (write_commit_graph(opts.obj_dir,
+			       pack_indexes,
+			       commit_hex,
+			       flags,
+			       &split_opts))
+		result = 1;
+
+	UNLEAK(lines);
+	return result;
+}
+
+int cmd_commit_graph(int argc, const char **argv, const char *prefix)
+{
+	static struct option builtin_commit_graph_options[] = {
+		OPT_STRING(0, "object-dir", &opts.obj_dir,
+			N_("dir"),
+			N_("The object directory to store the graph")),
+		OPT_END(),
+	};
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(builtin_commit_graph_usage,
+				   builtin_commit_graph_options);
+
+	git_config(git_default_config, NULL);
+	argc = parse_options(argc, argv, prefix,
+			     builtin_commit_graph_options,
+			     builtin_commit_graph_usage,
+			     PARSE_OPT_STOP_AT_NON_OPTION);
+
+	if (argc > 0) {
+		if (!strcmp(argv[0], "read"))
+			return graph_read(argc, argv);
+		if (!strcmp(argv[0], "verify"))
+			return graph_verify(argc, argv);
+		if (!strcmp(argv[0], "write"))
+			return graph_write(argc, argv);
+	}
+
+	usage_with_options(builtin_commit_graph_usage,
+			   builtin_commit_graph_options);
+}