shallow.c: extend setup_*_shallow() to accept extra shallow commits

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.h

@@ -201,10 +201,12 @@ extern struct commit_list *get_shallow_commits(struct object_array *heads,
 		int depth, int shallow_flag, int not_shallow_flag);
 extern void check_shallow_file_for_update(void);
 extern void set_alternate_shallow_file(const char *path);
-extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol);
+extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
+				 const struct sha1_array *extra);
 extern void setup_alternate_shallow(struct lock_file *shallow_lock,
-				    const char **alternate_shallow_file);
-extern char *setup_temporary_shallow(void);
+				    const char **alternate_shallow_file,
+				    const struct sha1_array *extra);
+extern char *setup_temporary_shallow(const struct sha1_array *extra);
 extern void advertise_shallow_grafts(int);
 
 int is_descendant_of(struct commit *, struct commit_list *);

fetch-pack.c

@@ -311,7 +311,7 @@ static int find_common(struct fetch_pack_args *args,
 	}
 
 	if (is_repository_shallow())
-		write_shallow_commits(&req_buf, 1);
+		write_shallow_commits(&req_buf, 1, NULL);
 	if (args->depth > 0)
 		packet_buf_write(&req_buf, "deepen %d", args->depth);
 	packet_buf_flush(&req_buf);
@@ -850,7 +850,8 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args,
 	if (args->stateless_rpc)
 		packet_flush(fd[1]);
 	if (args->depth > 0)
-		setup_alternate_shallow(&shallow_lock, &alternate_shallow_file);
+		setup_alternate_shallow(&shallow_lock, &alternate_shallow_file,
+					NULL);
 	else
 		alternate_shallow_file = NULL;
 	if (get_pack(args, fd, pack_lockfile))

shallow.c

@@ -165,22 +165,31 @@ static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 	return 0;
 }
 
-int write_shallow_commits(struct strbuf *out, int use_pack_protocol)
+int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
+			  const struct sha1_array *extra)
 {
 	struct write_shallow_data data;
+	int i;
 	data.out = out;
 	data.use_pack_protocol = use_pack_protocol;
 	data.count = 0;
 	for_each_commit_graft(write_one_shallow, &data);
+	if (!extra)
+		return data.count;
+	for (i = 0; i < extra->nr; i++) {
+		strbuf_addstr(out, sha1_to_hex(extra->sha1[i]));
+		strbuf_addch(out, '\n');
+		data.count++;
+	}
 	return data.count;
 }
 
-char *setup_temporary_shallow(void)
+char *setup_temporary_shallow(const struct sha1_array *extra)
 {
 	struct strbuf sb = STRBUF_INIT;
 	int fd;
 
-	if (write_shallow_commits(&sb, 0)) {
+	if (write_shallow_commits(&sb, 0, extra)) {
 		struct strbuf path = STRBUF_INIT;
 		strbuf_addstr(&path, git_path("shallow_XXXXXX"));
 		fd = xmkstemp(path.buf);
@@ -199,7 +208,8 @@ char *setup_temporary_shallow(void)
 }
 
 void setup_alternate_shallow(struct lock_file *shallow_lock,
-			     const char **alternate_shallow_file)
+			     const char **alternate_shallow_file,
+			     const struct sha1_array *extra)
 {
 	struct strbuf sb = STRBUF_INIT;
 	int fd;
@@ -207,7 +217,7 @@ void setup_alternate_shallow(struct lock_file *shallow_lock,
 	check_shallow_file_for_update();
 	fd = hold_lock_file_for_update(shallow_lock, git_path("shallow"),
 				       LOCK_DIE_ON_ERROR);
-	if (write_shallow_commits(&sb, 0)) {
+	if (write_shallow_commits(&sb, 0, extra)) {
 		if (write_in_full(fd, sb.buf, sb.len) != sb.len)
 			die_errno("failed to write to %s",
 				  shallow_lock->filename);

upload-pack.c

@@ -84,7 +84,7 @@ static void create_pack_file(void)
 	char *shallow_file = NULL;
 
 	if (shallow_nr) {
-		shallow_file = setup_temporary_shallow();
+		shallow_file = setup_temporary_shallow(NULL);
 		argv[arg++] = "--shallow-file";
 		argv[arg++] = shallow_file;
 	}