pack-objects: quickfix for permission modes.

mkstemp() often creates the file in 0600 which means the
resulting packfile is not readable by anybody other than the
repository owner.  Force 0644 for now, even though this is not
strictly correct.

Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-pack-objects.c

@@ -1783,11 +1783,17 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 		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 (chmod(pack_tmp_name, 0644))
+			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 (chmod(idx_tmp_name, 0644))
+			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));