1 files changed, 50 insertions, 18 deletions

diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
index 537fdfd0f0..38027b83d9 100644
--- a/builtin/commit-graph.c
+++ b/builtin/commit-graph.c
@@ -5,17 +5,18 @@
 #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>]"),
-	N_("git commit-graph write [--object-dir <objdir>] [--append] [--reachable|--stdin-packs|--stdin-commits]"),
+	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>]"),
+	N_("git commit-graph verify [--object-dir <objdir>] [--shallow]"),
 	NULL
 };
 
@@ -25,7 +26,7 @@ static const char * const builtin_commit_graph_read_usage[] = {
 };
 
 static const char * const builtin_commit_graph_write_usage[] = {
-	N_("git commit-graph write [--object-dir <objdir>] [--append] [--reachable|--stdin-packs|--stdin-commits]"),
+	N_("git commit-graph write [--object-dir <objdir>] [--append|--split] [--reachable|--stdin-packs|--stdin-commits] <split options>"),
 	NULL
 };
 
@@ -35,9 +36,10 @@ static struct opts_commit_graph {
 	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;
@@ -45,11 +47,14 @@ static int graph_verify(int argc, const char **argv)
 	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(),
 	};
 
@@ -59,21 +64,27 @@ static int graph_verify(int argc, const char **argv)
 
 	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)
-		return 0;
-	if (!open_ok)
+	if (!open_ok && errno != ENOENT)
 		die_errno(_("Could not open commit-graph '%s'"), graph_name);
-	graph = load_commit_graph_one_fd_st(fd, &st);
+
 	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 1;
+		return !!open_ok;
 
 	UNLEAK(graph);
-	return verify_commit_graph(the_repository, graph);
+	return verify_commit_graph(the_repository, graph, flags);
 }
 
 static int graph_read(int argc, const char **argv)
@@ -135,12 +146,15 @@ static int graph_read(int argc, const char **argv)
 }
 
 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,
@@ -154,9 +168,21 @@ static int graph_write(int argc, const char **argv)
 			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);
@@ -165,11 +191,16 @@ static int graph_write(int argc, const char **argv)
 		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) {
-		write_commit_graph_reachable(opts.obj_dir, opts.append, 1);
+		if (write_commit_graph_reachable(opts.obj_dir, flags, &split_opts))
+			return 1;
 		return 0;
 	}
 
@@ -188,14 +219,15 @@ static int graph_write(int argc, const char **argv)
 		UNLEAK(buf);
 	}
 
-	write_commit_graph(opts.obj_dir,
-			   pack_indexes,
-			   commit_hex,
-			   opts.append,
-			   1);
+	if (write_commit_graph(opts.obj_dir,
+			       pack_indexes,
+			       commit_hex,
+			       flags,
+			       &split_opts))
+		result = 1;
 
 	UNLEAK(lines);
-	return 0;
+	return result;
 }
 
 int cmd_commit_graph(int argc, const char **argv, const char *prefix)