1 files changed, 283 insertions, 0 deletions

diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
new file mode 100644
index 0000000000..15fe60317c
--- /dev/null
+++ b/builtin/commit-graph.c
@@ -0,0 +1,283 @@
+#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 verify [--object-dir <objdir>] [--shallow] [--[no-]progress]"),
+	N_("git commit-graph write [--object-dir <objdir>] [--append] "
+	   "[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
+	   "[--changed-paths] [--[no-]progress] <split options>"),
+	NULL
+};
+
+static const char * const builtin_commit_graph_verify_usage[] = {
+	N_("git commit-graph verify [--object-dir <objdir>] [--shallow] [--[no-]progress]"),
+	NULL
+};
+
+static const char * const builtin_commit_graph_write_usage[] = {
+	N_("git commit-graph write [--object-dir <objdir>] [--append] "
+	   "[--split[=<strategy>]] [--reachable|--stdin-packs|--stdin-commits] "
+	   "[--changed-paths] [--[no-]progress] <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;
+	int progress;
+	int enable_changed_paths;
+} opts;
+
+static struct object_directory *find_odb(struct repository *r,
+					 const char *obj_dir)
+{
+	struct object_directory *odb;
+	char *obj_dir_real = real_pathdup(obj_dir, 1);
+	struct strbuf odb_path_real = STRBUF_INIT;
+
+	prepare_alt_odb(r);
+	for (odb = r->objects->odb; odb; odb = odb->next) {
+		strbuf_realpath(&odb_path_real, odb->path, 1);
+		if (!strcmp(obj_dir_real, odb_path_real.buf))
+			break;
+	}
+
+	free(obj_dir_real);
+	strbuf_release(&odb_path_real);
+
+	if (!odb)
+		die(_("could not find object directory matching %s"), obj_dir);
+	return odb;
+}
+
+static int graph_verify(int argc, const char **argv)
+{
+	struct commit_graph *graph = NULL;
+	struct object_directory *odb = 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_BOOL(0, "progress", &opts.progress, N_("force progress reporting")),
+		OPT_END(),
+	};
+
+	trace2_cmd_mode("verify");
+
+	opts.progress = isatty(2);
+	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;
+	if (opts.progress)
+		flags |= COMMIT_GRAPH_WRITE_PROGRESS;
+
+	odb = find_odb(the_repository, opts.obj_dir);
+	graph_name = get_commit_graph_filename(odb);
+	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, odb);
+	else
+		graph = read_commit_graph_one(the_repository, odb);
+
+	/* Return failure if open_ok predicted success */
+	if (!graph)
+		return !!open_ok;
+
+	UNLEAK(graph);
+	return verify_commit_graph(the_repository, graph, flags);
+}
+
+extern int read_replace_refs;
+static struct split_commit_graph_opts split_opts;
+
+static int write_option_parse_split(const struct option *opt, const char *arg,
+				    int unset)
+{
+	enum commit_graph_split_flags *flags = opt->value;
+
+	opts.split = 1;
+	if (!arg)
+		return 0;
+
+	if (!strcmp(arg, "no-merge"))
+		*flags = COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED;
+	else if (!strcmp(arg, "replace"))
+		*flags = COMMIT_GRAPH_SPLIT_REPLACE;
+	else
+		die(_("unrecognized --split argument, %s"), arg);
+
+	return 0;
+}
+
+static int graph_write(int argc, const char **argv)
+{
+	struct string_list *pack_indexes = NULL;
+	struct oidset commits = OIDSET_INIT;
+	struct object_directory *odb = NULL;
+	struct string_list lines;
+	int result = 0;
+	enum commit_graph_write_flags flags = 0;
+
+	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, "changed-paths", &opts.enable_changed_paths,
+			N_("enable computation for changed paths")),
+		OPT_BOOL(0, "progress", &opts.progress, N_("force progress reporting")),
+		OPT_CALLBACK_F(0, "split", &split_opts.flags, NULL,
+			N_("allow writing an incremental commit-graph file"),
+			PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
+			write_option_parse_split),
+		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_("only expire files older than a given date-time")),
+		OPT_END(),
+	};
+
+	opts.progress = isatty(2);
+	split_opts.size_multiple = 2;
+	split_opts.max_commits = 0;
+	split_opts.expire_time = 0;
+
+	trace2_cmd_mode("write");
+
+	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_WRITE_APPEND;
+	if (opts.split)
+		flags |= COMMIT_GRAPH_WRITE_SPLIT;
+	if (opts.progress)
+		flags |= COMMIT_GRAPH_WRITE_PROGRESS;
+	if (opts.enable_changed_paths ||
+	    git_env_bool(GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS, 0))
+		flags |= COMMIT_GRAPH_WRITE_BLOOM_FILTERS;
+
+	read_replace_refs = 0;
+	odb = find_odb(the_repository, opts.obj_dir);
+
+	if (opts.reachable) {
+		if (write_commit_graph_reachable(odb, 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) {
+			struct string_list_item *item;
+			oidset_init(&commits, lines.nr);
+			for_each_string_list_item(item, &lines) {
+				struct object_id oid;
+				const char *end;
+
+				if (parse_oid_hex(item->string, &oid, &end)) {
+					error(_("unexpected non-hex object ID: "
+						"%s"), item->string);
+					return 1;
+				}
+
+				oidset_insert(&commits, &oid);
+			}
+			flags |= COMMIT_GRAPH_WRITE_CHECK_OIDS;
+		}
+
+		UNLEAK(buf);
+	}
+
+	if (write_commit_graph(odb,
+			       pack_indexes,
+			       opts.stdin_commits ? &commits : NULL,
+			       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);
+
+	save_commit_buffer = 0;
+
+	if (argc > 0) {
+		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);
+}