git-repack --max-pack-size: new file statics and code restructuring

Add "pack_size_limit", the limit specified by --max-pack-size,
"written_list", the list of objects written to the current pack,
and "nr_written", the number of objects in written_list.
Put "base_name" at file scope again and add forward declarations.
Move write_index_file() call from cnd_pack_objects() to
write_pack_file() since only the latter will know how
many times to call write_index_file().

Signed-off-by: Dana L. How <danahow@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-pack-objects.c

@@ -52,7 +52,8 @@ struct object_entry {
  * nice "minimum seek" order.
  */
 static struct object_entry *objects;
-static uint32_t nr_objects, nr_alloc, nr_result;
+static struct object_entry **written_list;
+static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
 
 static int non_empty;
 static int no_reuse_delta, no_reuse_object;
@@ -61,9 +62,11 @@ static int incremental;
 static int allow_ofs_delta;
 static const char *pack_tmp_name, *idx_tmp_name;
 static char tmpname[PATH_MAX];
+static const char *base_name;
 static unsigned char pack_file_sha1[20];
 static int progress = 1;
 static int window = 10;
+static uint32_t pack_size_limit;
 static int depth = 50;
 static int pack_to_stdout;
 static int num_preferred_base;
@@ -501,7 +504,11 @@ static int open_object_dir_tmp(const char *path)
     return mkstemp(tmpname);
 }
 
-static off_t write_pack_file(void)
+/* forward declarations for write_pack_file */
+static void write_index_file(off_t last_obj_offset, unsigned char *sha1);
+static int adjust_perm(const char *path, mode_t mode);
+
+static void write_pack_file(void)
 {
 	uint32_t i;
 	struct sha1file *f;
@@ -543,7 +550,32 @@ static off_t write_pack_file(void)
 		die("wrote %u objects while expecting %u", written, nr_result);
 	sha1close(f, pack_file_sha1, 1);
 
-	return last_obj_offset;
+	if (!pack_to_stdout) {
+			unsigned char object_list_sha1[20];
+			mode_t mode = umask(0);
+
+			umask(mode);
+			mode = 0444 & ~mode;
+
+			write_index_file(last_obj_offset, object_list_sha1);
+			snprintf(tmpname, sizeof(tmpname), "%s-%s.pack",
+				 base_name, sha1_to_hex(object_list_sha1));
+			if (adjust_perm(pack_tmp_name, mode))
+				die("unable to make temporary pack file readable: %s",
+				    strerror(errno));
+			if (rename(pack_tmp_name, tmpname))
+				die("unable to rename temporary pack file: %s",
+				    strerror(errno));
+			snprintf(tmpname, sizeof(tmpname), "%s-%s.idx",
+				 base_name, sha1_to_hex(object_list_sha1));
+			if (adjust_perm(idx_tmp_name, mode))
+				die("unable to make temporary index file readable: %s",
+				    strerror(errno));
+			if (rename(idx_tmp_name, tmpname))
+				die("unable to rename temporary index file: %s",
+				    strerror(errno));
+			puts(sha1_to_hex(object_list_sha1));
+	}
 }
 
 static int sha1_sort(const void *_a, const void *_b)
@@ -1537,8 +1569,6 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 	int use_internal_rev_list = 0;
 	int thin = 0;
 	uint32_t i;
-	off_t last_obj_offset;
-	const char *base_name = NULL;
 	const char **rp_av;
 	int rp_ac_alloc = 64;
 	int rp_ac;
@@ -1707,33 +1737,7 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 		fprintf(stderr, "Result has %u objects.\n", nr_result);
 	if (nr_result)
 		prepare_pack(window, depth);
-	last_obj_offset = write_pack_file();
-	if (!pack_to_stdout) {
-		unsigned char object_list_sha1[20];
-		mode_t mode = umask(0);
-
-		umask(mode);
-		mode = 0444 & ~mode;
-
-		write_index_file(last_obj_offset, object_list_sha1);
-		snprintf(tmpname, sizeof(tmpname), "%s-%s.pack",
-			 base_name, sha1_to_hex(object_list_sha1));
-		if (adjust_perm(pack_tmp_name, mode))
-			die("unable to make temporary pack file readable: %s",
-			    strerror(errno));
-		if (rename(pack_tmp_name, tmpname))
-			die("unable to rename temporary pack file: %s",
-			    strerror(errno));
-		snprintf(tmpname, sizeof(tmpname), "%s-%s.idx",
-			 base_name, sha1_to_hex(object_list_sha1));
-		if (adjust_perm(idx_tmp_name, mode))
-			die("unable to make temporary index file readable: %s",
-			    strerror(errno));
-		if (rename(idx_tmp_name, tmpname))
-			die("unable to rename temporary index file: %s",
-			    strerror(errno));
-		puts(sha1_to_hex(object_list_sha1));
-	}
+	write_pack_file();
 	if (progress)
 		fprintf(stderr, "Total %u (delta %u), reused %u (delta %u)\n",
 			written, written_delta, reused, reused_delta);